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RE:Been doing some tuning... |
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Elite Guru
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Here is the Volumetric Efficiency tables:
And the Sequential injection individual cylinder adjustments: There is a setting in ECM Constants that controls what TPS% the off idle table is no longer used, factory setting is 12.9%, once the TPS exceeds that, all cylinders are considered equal, with the exception of left and right banks still being controlled by their respective BLM corrections.
Posted on: 2007/9/5 15:52
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RE:Been doing some tuning... |
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Elite Guru
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Here is all the items that can be set:
ECM Switch and ECM Constants have loads more adjustables
Posted on: 2007/9/5 15:29
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RE:Been doing some tuning... |
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Elite Guru
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Here is a few fan temp settings as well as a couple other items,
The Coolant thresh for TPS for WOT (HIGH TEMP) relates to power enrichment mode, there are 2 tables for that, 1 table for all coolant temps up to the setting in the constant, and another table for any coolant temp over the setting. Here is where it activates WOT, once it reaches those TPS%s, it is in power enrichment:
Posted on: 2007/9/5 15:24
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RE:Been doing some tuning... |
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Elite Guru
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Here is the settings for rear end ratio and rear tire size changes:
Posted on: 2007/9/5 15:11
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RE:Been doing some tuning... |
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Elite Guru
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Ok here are some pics:
First up ill show some shift tables from various .bin files ive got here: The first ones i have are from a 3.07:1 car, not 100% certain if they are stock settings or not, but they are not far off if they have been changed]http://i11.photobucket.com/albums/a185/Casethecorvetteman/Tuning/shifts.jpg[/img] This is more what it looked like after id done some changes, all numbers in [color=red]red[/color:a8728d4bc2] are the ones i changed]http://i11.photobucket.com/albums/a185/Casethecorvetteman/Tuning/raysshiftchange1-1.jpg[/img] These were my shift points from a while back (3.33:1 rear end): Youll notice by looking at the graphs in the last 2 that the shift points are far more consistant and make alot better use of the PCM's ability, and i can say from experience the car is alot better/more efficient/smoother/quicker/easier and more exciting to drive.
Posted on: 2007/9/5 15:07
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Elite Guru
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If you got banned for something like that, its incredible im still allowed near the site!!
Posted on: 2007/9/5 14:17
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Grand Imperial Pooh-Bah
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2005/9/7 0:00 From San Pedro, CA
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hm. that thread had nothing but trouble written all over it.
as an aside, I have strobes on my C4. I learned the necessity of them if you ever lead a caravan... or want a little bling in a parade. I just need to get a better set.
Posted on: 2007/9/5 13:56
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Elite Guru
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...
Posted on: 2007/9/5 13:26
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RE:Been doing some tuning... |
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Elite Guru
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Quote:
ok... Indeed mate, its got loads of it there Quote: The tranny is a strange bird on those things, I will agree. The thing is, tho, that if throttle position could be a little more independant of fuel needs, the more open throttle would equate to lower pumping losses. Theoretically, that would equate to better MPG. But that's in theory. Fueling doesnt work that way though, its on a table of RPM Vs MAP KPa, throttle position sensor has nothing really to do with it until it reaches the preset level for Power Enrichment. As soon as you put your foot down abit more, with little or no increase in RPM, the MAP will rise straight away Quote: I fully appreciate the need for better tractibility, especially with a modifed car. No question at all. Quote: Oh, and the 1993 PROM is not updatable like the 1994 and later models. You have to literally burn the chip with a new tune. Yep, we know that
Posted on: 2007/9/5 3:15
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RE:Been doing some tuning... |
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Grand Imperial Pooh-Bah
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ok...
Cam is good for over lap, check. The tranny is a strange bird on those things, I will agree. The thing is, tho, that if throttle position could be a little more independant of fuel needs, the more open throttle would equate to lower pumping losses. Theoretically, that would equate to better MPG. But that's in theory. I fully appreciate the need for better tractibility, especially with a modifed car. No question at all. You don't need a gas pedal that acts like a light switch... the usually means WRECK!! Oh, and the 1993 PROM is not updatable like the 1994 and later models. You have to literally burn the chip with a new tune.
Posted on: 2007/9/5 2:14
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RE:This is just the start! |
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Grand Imperial Pooh-Bah
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Quote:
Quote: I know! I don't get here much during the work day! So its great to come back to see some action.
Posted on: 2007/9/5 2:09
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RE:This is just the start! |
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Grand Imperial Pooh-Bah
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Redvette! Z51! Great to see you both back!
Spread the word, but be gentle... I don't want CF banning everyone over there... or worse yet, banning me. I have a plan, and getting banned doesn't get it done!
Posted on: 2007/9/5 2:09
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RE:My 84 DESTINY |
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Grand Imperial Pooh-Bah
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nice!
We need to get some photoshop training... that product can do some wack stuff... and the folks who can abuse it really can get something special out of it.
Posted on: 2007/9/5 2:06
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RE:What does |
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Grand Imperial Pooh-Bah
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Great!
The basic idea 3 years ago was to turn this into a published magazine... but that idea faded... my current idea is to take advantage of Amazon's modern version of the vanity press and make something happen. If nothing else, we could become a DIY for automotive repairs book publisher. never know.
Posted on: 2007/9/5 2:05
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RE:What does |
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Senior Guru
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2007/4/29 0:00 From Mountain View, Southern Mo.,
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Alrighty then,thanks bogus.I'm proud to be pert of it now.
Posted on: 2007/9/4 21:25
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Aint no amount of gold in any ole mine,that would be enough to take away this car of mine.-beach boys |
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RE:What does |
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Grand Imperial Pooh-Bah
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don't fret it. that's residue from when we set this up 3 years ago.
Posted on: 2007/9/4 15:59
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RE:My 84 DESTINY |
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Mega Guru
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2007/8/31 0:00 From Central PA
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Right on man! Pretty car, and a great story behind it!
Posted on: 2007/9/4 12:51
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Currently "Between Vettes". |
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RE:This is just the start! |
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Elite Guru
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I suspect it won't be much longer before the most recent five threads will be a drop in the bucket!!! Hey its allready like that for me sometimes with the odd hours i get on here!!
Posted on: 2007/9/4 7:26
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RE:Been doing some tuning... |
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Elite Guru
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Happy to hear you are getting good at this Case, any idea what it takes to burn a chip for my 93? Perhaps I'll buy you the toys mate if I can get a free tune....... Im not sure what is required for doing the new chip on your 93, ive never looked into that, but the available settings and adjustables are all pretty simular. I have TunerCat allready, all i need for your car is the ECM definition file. You need to get an ALDL cable for that car!! Ill have to see if i have enough bits here to make you one up, i think i remember you telling me you have a spare desktop computer there, even though you cant take that with you out on the road to do some logging (unless you start it all up and run it from a big UPS!! ), youll be able to set that up out in your shed and try the cable out until you get a suitable laptop.
Posted on: 2007/9/4 7:23
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What does |
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Senior Guru
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2007/4/29 0:00 From Mountain View, Southern Mo.,
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What does the term suscriber guru mean,on my account page it says that I am not a suscriber guru, is that good or bad? and what do I do about it? I'm sorry for my ignorance.
Posted on: 2007/9/4 7:19
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Aint no amount of gold in any ole mine,that would be enough to take away this car of mine.-beach boys |
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RE:Been doing some tuning... |
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Elite Guru
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Posts:
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Quote:
There is a great book out there, called "Corvette Fuel Injection and Electronic Ignition: 1982-2001," by Charles Probst. It's a great primer on how this works. I havent seen that book over here anywhere, but ive heard its reasonably good Quote: My only thought... if you can make the EGR work, it will help... it does one thing via another thing (follow that logic :thumbright: ). Not possible, cause most of the stuff is missing. I wouldnt hook it back up even if i could though, the cam has more than enough overlap to take care of EGR. Quote: The transmission is turned for MPG (which, by extention means emissions). Mess with it too much and your economy will go right out the window!!! I know gas is pricy in Oz, so you might want to go easy there... but I see your point. ? But the tuning is totally unsuitable for a modded engine, and it will actually use more fuel due to labouring in a higher gear. I have the shift points set low enough at lower TPS%s, but ive smoothed out the tables alot (which from the factory, look like a dog's breakfast) Trying to push a higher gear takes more effort, which takes more throttle, and more fuel. Ive managed to improve the "around town" fuel economy by setting the trans up to select the right gear for the given situation, and based on my engine's characteristics. When cruising slowly, i have it setup to select the highest gear it can push without labouring. As an example, if im cruising along at 60kph and want to accelerate to 75kph, factory settings would hold it in forth until my foot was near the floor, and it would labour its arse off and accelerate like a slug, and if i pushed my foot down far enough to make it shift down, i would get such a sudden rush of power and the car would take off like a rocket when i didnt want it to do so. I will dig up some pictures of shift tables and post them up for ya to look at so you can see what ive done with them, i have a stock .bin file here and i think it has it's stock shift points on it (although i know they are scaled down for a ratio change) Quote: Very interesting stuff! Have you found a dyno to test it on? No mate i havent been able to yet, i know of a few around, but havent had a chance. Ive been running Data Master most days lately though and i take notice of everything that is going on there, especially in relation to what effects my changes have made. Fuel isnt cheap over here, not much more then there, but its not a real big deal, the car is quite economical really considering the power its got. I certainly want to enjoy the car my way though, and sometimes ecomomy just has to take a number and stand in line!!
Posted on: 2007/9/4 7:04
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RE:Lets meet some people, post pic of you with car or just you. |
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Senior Guru
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My wife took this about 3 weeks ago,I hate seeing myself in pics.
Posted on: 2007/9/4 6:37
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Aint no amount of gold in any ole mine,that would be enough to take away this car of mine.-beach boys |
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RE:CREWZIN's Garage |
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Senior Guru
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Who needs girly mags anyway,I could look at this stuff all day and die with a smile.
Posted on: 2007/9/4 6:21
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Aint no amount of gold in any ole mine,that would be enough to take away this car of mine.-beach boys |
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RE:Alcee's Garage |
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Senior Guru
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2007/4/29 0:00 From Mountain View, Southern Mo.,
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Fantasy Island stuff right there baby 11 out of posible 10. Thanks for that pic. Whew!
Posted on: 2007/9/4 6:17
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Aint no amount of gold in any ole mine,that would be enough to take away this car of mine.-beach boys |
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What amps? |
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Senior Guru
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2007/4/29 0:00 From Mountain View, Southern Mo.,
Posts:
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Hello Bogus,My favorite Corvette person of all times,literally. I haven't seriously dabbled in the audio department since the early eighties,so bear with me please,I've got a list of questions.
1. what do they mean by the phrase HEAD UNIT. 2.Where are the amps in an 84 Vette?,I've been all over this car and haven't seen them. 3.My car didn't come with a bose system,just a cheap roadmaster cassett player and Alpine speakers in the dash, doors and the back,they seem to be in very good shape.Should I replace all of the audio wires and put new for saftey reasons or go with what was there? Thank you for your time. daddue11
Posted on: 2007/9/4 6:09
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Aint no amount of gold in any ole mine,that would be enough to take away this car of mine.-beach boys |
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My 84 DESTINY |
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Senior Guru
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2007/4/29 0:00 From Mountain View, Southern Mo.,
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Here's a pic of my 84,I just blacked out the background and put in the designs.
Posted on: 2007/9/4 3:11
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Aint no amount of gold in any ole mine,that would be enough to take away this car of mine.-beach boys |
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RE:Colours... |
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Guru
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2005/12/12 0:00 From OREGON
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127
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thoes colors sound really good
Posted on: 2007/9/4 2:39
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1990 roadster |
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RE:This is just the start! |
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Guru
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thats great news bogus
Posted on: 2007/9/4 1:53
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1990 roadster |
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RE:Under New Management |
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Guru
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sounds good bogus, if you need help in any way in terms of a mod, just let me know
i know i havn't been around that much, but i am starting to hang out here more often for C4 advice
Posted on: 2007/9/4 1:47
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1990 roadster |
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RE:This is just the start! |
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Guru Newb
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2006/5/21 0:00 From Minneapolis
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It's been a year thought I'd say howdy
Posted on: 2007/9/4 1:27
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RE:Under New Management |
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Grand Imperial Pooh-Bah
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Thanks!!!! Looking forward to seeing more familier faces over here!
Posted on: 2007/9/3 22:51
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RE:Been doing some tuning... |
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Elite Guru
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2007/9/2 0:00 From Western Philadelphia Burbs
Posts:
4247
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Quote:
There is a great book out there, called "Corvette Fuel Injection and Electronic Ignition: 1982-2001," by Charles Probst. It's a great primer on how this works. I agree - almost everything I know about my L98 is from reading and re-reading this book.
Posted on: 2007/9/3 21:31
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Grace, 2003 50th Anniversary Convertible |
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Tuning |
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Senior Guru
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362
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Happy to hear you are getting good at this Case, any idea what it takes to burn a chip for my 93? Perhaps I'll buy you the toys mate if I can get a free tune.......
Posted on: 2007/9/3 21:04
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RE:[L98] Can The MAF Go Bad Without Throwing A Code? |
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Elite Guru
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2007/9/2 0:00 From Western Philadelphia Burbs
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hm... I would take advantage of time. I hear you - I think the first thing I'm going to do is disconnect the battery and start checking wiring and cleaning connectors. Ah, the glamour of C4 ownership ...
Posted on: 2007/9/3 19:04
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Grace, 2003 50th Anniversary Convertible |
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RE:[L98] Can The MAF Go Bad Without Throwing A Code? |
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Grand Imperial Pooh-Bah
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Posts:
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hm... I would take advantage of time.
To me, a failure that is heat related means something is soon to die. I would start checking the wiring very closely.
Posted on: 2007/9/3 18:55
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RE:[L98] Can The MAF Go Bad Without Throwing A Code? |
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Elite Guru
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they can get slow... they can get wacky... they can act weird... all of witch may or may not throw a code. failure would result in a code. I agree - what I really to do is go over all my wiring with a fine tooth comb. Problem is that I have to do this soon before the weather gets colder and the engine starts behaving again ...
Posted on: 2007/9/3 18:53
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Grace, 2003 50th Anniversary Convertible |
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RE:Colours... |
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Grand Imperial Pooh-Bah
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cool. I will tinker...
Posted on: 2007/9/3 18:48
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Congratulations Andy |
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Senior Guru
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Will definitely be spending more time here after the changes at CF, best of luck making this the best forum out there.
Posted on: 2007/9/3 18:12
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RE:This is just the start! |
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Grand Imperial Pooh-Bah
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I suspect it won't be much longer before the most recent five threads will be a drop in the bucket!!!
Posted on: 2007/9/3 17:17
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RE:Been doing some tuning... |
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Grand Imperial Pooh-Bah
Joined:
2005/9/7 0:00 From San Pedro, CA
Posts:
20859
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There is a great book out there, called "Corvette Fuel Injection and Electronic Ignition: 1982-2001," by Charles Probst. It's a great primer on how this works.
My only thought... if you can make the EGR work, it will help... it does one thing via another thing (follow that logic :thumbright: ). The EGR helps lower NOx emissions. That's what it does... but it does it by introducing a touch of exhaust back into the combustion chamber. This, in effect, cools the charge. The other thing it does is lowers the chance of detonation. The transmission is turned for MPG (which, by extention means emissions). Mess with it too much and your economy will go right out the window!!! I know gas is pricy in Oz, so you might want to go easy there... but I see your point. Very interesting stuff! Have you found a dyno to test it on?
Posted on: 2007/9/3 17:14
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RE:[L98] Can The MAF Go Bad Without Throwing A Code? |
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Grand Imperial Pooh-Bah
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Posts:
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that's a different problem, casey!
I had a guy with a 92 vert, and someone ran his two temp sensors to the same source!!! This was their quick fix for a bad wire to the head sensor... unbelieveable. the pre-1991 vettes have wiring made up of different materials. The insulation is no where NEAR as resistant to heat and chemicals as the later wiring. Somewhere around 1990, the SAE decided to change the composition of the wiring... that made a huge difference in the durability of engine harnesses. I suggest that people check the relay connectors and anything related to the harness whenever there is a wacky problem like this.
Posted on: 2007/9/3 17:08
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RE:Lets meet some people, post pic of you with car or just you. |
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Senior Guru
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2006/8/7 0:00 From Windsor Ontario Canada
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514
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Don't get on here too much but here's my Vette.........
Here's the wife and I on our cruise Gary
Posted on: 2007/9/3 17:05
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I got fun..Ya want Some? :tongue: |
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RE:Been doing some tuning... |
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Mega Guru
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2007/8/31 0:00 From Central PA
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Someday I hope to understand what you just said!
You gotta love it when you figure out stuff like that and make forward progress. Good on ya! :thumbright:
Posted on: 2007/9/3 16:06
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Currently "Between Vettes". |
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RE:So, have y'all given up on this place? |
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Guru
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2007/8/31 0:00 From Las Vegas, NV
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357
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Lots of new members this week alone. With the commercialization of the "other site" I feel this place can only grow bigger and bigger. Plus, with the changes going on here and the additions Andy is making to the Tech article section this site is poised to become THE place for C4 owners to find GOOD information about maintaining and repairing their cars.
Hang in there everyone this place is poised to take off! :thumbright:
Posted on: 2007/9/3 15:40
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Brian VTvette 1993 triple black roadster 6 speed |
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Been doing some tuning... |
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Elite Guru
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Finally starting to make some good progress now too. Its quite a big thing when you look into it.
I thought some of you might find it interesting to read some of my opinions based on my findings from doing abit of learning, asking a few questions here and there, and trying different settings over and over til i decide what really suits best. When i first got my 94 it was running on a stock factory tune, wayyy too rich at idle, it would quite regularly peg out at 108 and run rough as guts. The last few days ive gotten back into it and in just the last 2 or 3 days ive managed to get it to idle quite well, which was the hardest part of it all really. The engine being as moddified as it is, it shouldve been tuned properly at the time. Here is a list of what i know is in there: (and some of these i wouldnt really bother with if i was doing all this myself, most of this was done for me before i bought the car, however some of it quite poorly and i had to fix alot of it) *EGR and AIR are present, but decomissioned (and EGR was setting a DTC every few months) *After market cam, specs unknown, idle vacuum is around 52 KPa and power comes on real strong abit after 3,000rpm, (doesnt drop off one bit all the way to 6,000rpm where i have set rev limiter) *Crane Gold 1.6:1 roller rockers *Crane double springs *Ported heads *Stock throttle body bored over *MAF bored over *Tri-Y long tube headers *High flow cats *Straight through mufflers *Etc etc etc etc.... Ive had the PCM in speed density mode the last couple weeks so i can make the VE tables as good as i can get them, they are pretty tidy now after abit of work. Will put it back to MAF when im totally happy with the VE tables and do some work on the MAF tables.... Running on a stock tune it was still more powerful than a stock engine, but it was nothing compared to what it is now. It was picking up alot of knock with the stock spark tables at higher MAP levels, There is far more involved then just adjusting the timing and the VE/MAF tables though. Ive managed to reduce a serious split BLM issue at idle and part throttle from as much as 10 different all the way down to 1 and ocationally 2, although mostly even, by adjusting the squential injection correction tables (which is what was causing the split BLMs in the first place) It seems as though the bigger cam and other mods has made the idle air distribution abit more even, probably due to the reduced intake velocity at idle and lower rpm. Ive also made some changes to the DFCO, cause with the bigger cam and reduction in vacuum, the stock DFCO settings are not as easily reached, so is harder to activate. Transmission shift points play a bigger part with a modded engine too, the stock shift points on the 4L60-Es are set so that if almost requires full throttle to shift it back a gear, and at lower speeds this is rediculous, cause most of the time coming from 3rd gear id end up in first, and on the highway, putting the boot into it wouldnt kick it back to 3rd cause of the factory settings, yet abit more throttle and youre back to 2nd at 75mph... With all that i found the shifting up was happening too early for the modded engine, and was an extremely abrupt surge of power when it did shift back until i lowered so numbers to better suit my engine power range and my driving style.
Posted on: 2007/9/3 11:37
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RE:[L98] Can The MAF Go Bad Without Throwing A Code? |
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Elite Guru
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2006/7/18 0:00 From QLD, Australia
Posts:
2071
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Previous owners allowing dubious work to be carried out hasnt helped my wiring, just today i fixed the right knock sensor wire cause it was all frayed from touching the long tube headers before i got the car...
Posted on: 2007/9/3 9:37
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RE:So, have y'all given up on this place? |
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Elite Guru
Joined:
2006/7/18 0:00 From QLD, Australia
Posts:
2071
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No worries mate, ill drink to that
Posted on: 2007/9/3 9:32
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RE:This is just the start! |
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Elite Guru
Joined:
2006/7/18 0:00 From QLD, Australia
Posts:
2071
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Great work mate ;) Its picking up very well
Posted on: 2007/9/3 8:45
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RE:C4 radio and heat/ac not working |
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Guru
Joined:
2007/8/31 0:00 From Las Vegas, NV
Posts:
357
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In the engine compartment on the right hand (passengers) side in front of the heater box on the top of the frame rail you should see a ground wire screwed to the frame. Check this ground it's for the blower motor among other things but can cause all kinds of issues if it's bad.
Also check the ground in front of the passengers side door below the "A" pillar. That is where the radio head unit is ultimately grounded. The HVAC head unit grounds at the drivers side lower "A" pillar ground in front of the drivers side door. The heater/AC programmer ground could also be causing issues. This unit grounds at the same place as the HVAC head unit mentioned above.
Posted on: 2007/9/3 5:37
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Brian VTvette 1993 triple black roadster 6 speed |
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RE:Colours... |
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Guru Emeritus
Joined:
2005/9/8 0:00 From Los Angeles
Posts:
277
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I like those colors, I really like the ones for the c5/c6 forum.
Posted on: 2007/9/3 5:33
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Edlebrock Heads, 2030 cam, X-ram w/EGR, 1.6 R/R, Bored TB´s, AFPR, Pro-built Tranny, Vigilantly 2600, Transgo, Dana 44 3.54, Hardened Pushrods & Head Bolts, Custom performance chip, K&N, Double roller timing chain, Aluminum radiator & flex hose, MS |
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