ignition timiming [Forums - C4 Technical]

C4 Technical > ignition timiming
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BlkCpe	ignition timiming	#1
Guru Newb Georgia 23 Posts Member since: 2008/1/27 0:00	need a little tech help. anyone running a custom chip on a l98 stroker ? if so what is your base timing ,total advance and at what rpm is it in at. thanks
	Posted on: 2008/1/31 2:42

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bogus	RE:ignition timiming	#2
Grand Imperial Pooh-Bah San Pedro, CA 20859 Posts Member since: 2005/9/7 0:00	wow. that's a loaded question! Without knowing the chip, I can't give you anything concrete. With timing, it is set at 6* BTDC, I would start to advance 2* at a time and test drive it. I doubt you can go much past 10*, tho. Do you have any documentation with the chip? Who burned it? Have you gotten up with them?
	Posted on: 2008/1/31 3:21

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BlkCpe	RE:ignition timiming	#3
Guru Newb Georgia 23 Posts Member since: 2008/1/27 0:00	i set it at 6* ,it didnt like it.reset @4 but havent test drove yet.the chip is of 'unknown' orgins .it was in car when i got it.i do know its modded because the a little lite on pollution equip. low temp fan operation w/no fault codes.ive run w/snapon scanner on it every thing looked ok. i know that i need a new tune w/the new combo i have just iam undecieded on an intake so i was tring to make do with the current one untill then.
	Posted on: 2008/1/31 3:39
	_________________ 88 cpe 383 a4 by outlaw trans hot cam pro ported heads/intake 2 1/2 exhaust w/flowmasters cut lidw/kandn afs 17x9.5 17x11's tunes by kenwood/infinity body colored side molding door handles and emblems
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bogus	RE:ignition timiming	#4
Grand Imperial Pooh-Bah San Pedro, CA 20859 Posts Member since: 2005/9/7 0:00	well... there are mods and then there are hacks. Gutting emissions and turning off a few warnings are not what I call mods. 4* is too retarded for timing, I would go back to 6* and see what happens.
	Posted on: 2008/1/31 4:05

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BlkCpe	RE:ignition timiming	#5
Guru Newb Georgia 23 Posts Member since: 2008/1/27 0:00	well it looks like the only thing to do is have a new chip burnt ,because at 6it's full advance@3000rpm and 42 I think it should be around 36 to38 total.Part throttle is fine but wot it detonates a little. Just need to pick a intake now.Thanks for advice.
	Posted on: 2008/1/31 21:04

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CFI-EFI	RE:ignition timiming	#6
Senior Guru Top of Utah 372 Posts Member since: 2005/9/9 0:00	Quote: because at 6it's full advance@3000rpm and 42 I think it should be around 36 to38 total. hOW DO YOU KNOW THAT? dO YOU HAVE A CHIP READER? RACE ON!!!
	Posted on: 2008/1/31 23:38

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BlkCpe	RE:ignition timiming	#7
Guru Newb Georgia 23 Posts Member since: 2008/1/27 0:00	Because I own a timing light. The 36 to38 is a guess based on other information I have gathered. I'am not looking to cause an argument only seeking out all the info I can get so that the combo will be well sorted and proform at its best.
	Posted on: 2008/2/1 0:17

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CFI-EFI	RE:ignition timiming	#8
Senior Guru Top of Utah 372 Posts Member since: 2005/9/9 0:00	Quote: Because I own a timing light. The 36 to38 is a guess based on other information I have gathered. You can't READ total timing with a timing light on a computer controlled car. That is why I asked if you had a chip reader. "I'am not looking to cause an argument only seeking out all the info I can get so that the combo will be well sorted and proform at its best." I can can give you the best of both. RACE ON!!!
	Posted on: 2008/2/1 0:36

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BlkCpe	RE:ignition timiming	#9
Guru Newb Georgia 23 Posts Member since: 2008/1/27 0:00	Fair enough,I dont have a chip reader but I do have access to a snapon scanner.Its a few years old and has not been updated since about '96,but it still seems to work fine.Thanks
	Posted on: 2008/2/1 0:49

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byebyeL98	Re: ignition timiming	#10
Guru Newb Orange County, NY 41 Posts Member since: 2007/12/30 0:00	Quote: need a little tech help. anyone running a custom chip on a l98 stroker ? if so what is your base timing ,total advance and at what rpm is it in at. thanks Yup - 17* base timing, total advance of 39* at heavy loads all in at 3200 rpm. I run 28* at idle.
	Posted on: 2008/2/1 1:02
	_________________ ´87 coupe, 383, ZF 6 Speed, 4.10s
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CFI-EFI	RE:ignition timiming	#11
Senior Guru Top of Utah 372 Posts Member since: 2005/9/9 0:00	Quote: Fair enough,I dont have a chip reader but I do have access to a snapon scanner.Its a few years old and has not been updated since about '96,but it still seems to work fine.Thanks How would a scanner tell you total timing any better than a timing light? Have you thought any of this through? RACE ON!!!
	Posted on: 2008/2/1 1:03

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CFI-EFI	RE:ignition timiming	#12
Senior Guru Top of Utah 372 Posts Member since: 2005/9/9 0:00	Quote: I am saving this forever!! Just because we agreed on something? Despite all of your picking on me, I think we agree more than we disagree. RACE ON!!!
	Posted on: 2008/2/1 1:12

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BlkCpe	RE:ignition timiming	#13
Guru Newb Georgia 23 Posts Member since: 2008/1/27 0:00	Please explain. (checking timing)because all I know is how to set base timing.My mistake ,I thought it would be like a non-efi when it come to checking total advance.Formal tech training preaches Stock Stock Stock .Still,it doesn't change the problem.
	Posted on: 2008/2/1 1:28

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CFI-EFI	RE:ignition timiming	#14
Senior Guru Top of Utah 372 Posts Member since: 2005/9/9 0:00	Quote: Please explain. (checking timing)because all I know is how to set base timing.My mistake ,I thought it would be like a non-efi when it come to checking total advance. When you check the advance curve and total timing with a mechanical advance distributor, you disconnect the vacuum hose from the vacuum advance cannister and read the centrifugal advance. At WOT you have no vacuum so whatever the centrifugal advance does, is what you get. How are you disabling the "vacuum advance" with your computer controlled distributor? You can't. The TPS isn't sending a 100% throttle reading to the computer, the MAP isn't reading 0 (ambient) manifold pressure, the MAF isn't reading the air flow that WOT would produce at the same rpms. Unless you can read the chip, to see how it is programmed, the only way to check your WOT ignition timing curve is on the fly. A recording scanner might do it, but just hooked up, in the garage, it will only give you what you get with the timing light, which is meaningless. RACE ON!!!
	Posted on: 2008/2/1 2:03

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MK 82	Re: ignition timiming	#15
Senior Guru Palm Beach Gardens, FL 439 Posts Member since: 2007/12/28 0:00	Quote: Quote: need a little tech help. anyone running a custom chip on a l98 stroker ? if so what is your base timing ,total advance and at what rpm is it in at. thanks Yup - 17* base timing, total advance of 39* at heavy loads all in at 3200 rpm. I run 28* at idle. How are you setting this 17 degrees base timing?
	Posted on: 2008/2/1 2:16
	_________________ 96 CE Roadster LT4
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byebyeL98	RE:ignition timiming	#16
Guru Newb Orange County, NY 41 Posts Member since: 2007/12/30 0:00	In addition, anything done with the car in the garage will be under VERY light load conditions. Programmed timing for a specific RPM can vary as much as 15-20 degrees for the same RPM at different loads. You would either need to look at the .bin file to see programmed total advance or data log to see the timing figures I think you are after.
	Posted on: 2008/2/1 2:18
	_________________ ´87 coupe, 383, ZF 6 Speed, 4.10s
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BlkCpe	RE:ignition timiming	#17
Guru Newb Georgia 23 Posts Member since: 2008/1/27 0:00	Thanks guys for your input. I got it now.
	Posted on: 2008/2/1 2:25

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byebyeL98	Re: ignition timiming	#18
Guru Newb Orange County, NY 41 Posts Member since: 2007/12/30 0:00	Quote: How are you setting this 17 degrees base timing? The specs on my cam call for base timing anywhere from 14* to 17. I found it idled best at 17 w/ the ESC disconnected. Here are the specs: VALVE LIFT INT. w/ 1.6 0.5808 VALVE LIFT EXH. W/ 1.6 0.5808 L/C 112 ADV OR RETARD 4 INT. DUR 306 EXH. DUR 306 INT. DUR @ .050 240 EXH. DUR @ .050 240 OVERLAP 82 INT PHASE ANGLE or LC 108 EXH PHASE ANGLE or LC 116
	Posted on: 2008/2/1 2:28
	_________________ ´87 coupe, 383, ZF 6 Speed, 4.10s
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MK 82	RE:ignition timiming	#19
Senior Guru Palm Beach Gardens, FL 439 Posts Member since: 2007/12/28 0:00	Just sounded strange. Never heard of a base timing that high.
	Posted on: 2008/2/1 2:36
	_________________ 96 CE Roadster LT4
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byebyeL98	RE:ignition timiming	#20
Guru Newb Orange County, NY 41 Posts Member since: 2007/12/30 0:00	Neither had I until I spoke to the tech over at Howard's Cams. :thumbright:
	Posted on: 2008/2/1 2:55
	_________________ ´87 coupe, 383, ZF 6 Speed, 4.10s
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