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| flyboy | My '91 on the dyno | ||
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My '91 modified 350 L98 was dyno tuned last Sat. It was running really good before but picked up 11 HP and 7 ft.lbs.
She idles and drives beautiful. I cut a 13.09 in 82* weather and best top speed of 107 before my alternator blew so I feel I will reach my goal of breaking into the 12's next time. Pretty good for a LT4 Hotcammed long tube runner setup, I think. Comments? Attach file:  P1010004.JPG (145.12 KB) P1010001.JPG (147.22 KB) |
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Posted on: 2010/6/20 20:04
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| Matatk | Re: My '91 on the dyno | ||
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Very nice, Joe. What all did they do as far as the tuning? Was it just messing with fp and timing, or did they burn a chip? What did that run you at Speed, Inc? You can PM me the details, because I'd like to get on a dyno once I'm all done.
Matthew |
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Posted on: 2010/6/20 20:20
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| BeachBum | Re: My '91 on the dyno | ||
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Good runner !!
Congrats !  |
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Posted on: 2010/6/20 22:46
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| 88BlackZ51 | Re: My '91 on the dyno | ||
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With that cam it certainly peaks alot more then stock. Nice to see.....
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Posted on: 2010/6/23 9:36
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| Josh | Re: My '91 on the dyno | ||
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In your expert opinion, what would you have expected it to do? |
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Posted on: 2010/6/23 12:09
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| flyboy | Re: My '91 on the dyno | ||
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...better than I had hoped, in my not so expert opinion.
Check out this excellent reference. http://www.eecis.udel.edu/~davis/z28/winter01/dyno/ |
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Posted on: 2010/6/23 12:18
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| dan0617 | Re: My '91 on the dyno | ||
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Awesome job. Are your heads still bone stock? If so, impressive! Nice to see a TPI intake getting down towards and eventually into the 12's. Don't see that too often, although there are some here who have done it. My guess is, with an intake swap to a LT1 style or a superram, and a matching converter if you are an auto, you would be a mid to low 12 car. |
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Posted on: 2010/6/23 12:51
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ยด89 Vert, 383, 230/236 cam, AFR 195's, LT Headers, HSR intake, 2800 stall, Zex 200 shot, ET Street Radials, tune by me. Runs were with D36 3.07's. On spray, 10.55 @ 132.78, 1.55 60 ft. On motor, 12.08 @ 113.15, 1.66 60 ft. |
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| flyboy | Re: My '91 on the dyno | ||
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Thanks. The heads are home ported factory 113's with 2.00X1.55 valves.
As for an intake change, I don't think so, regardless of how it might improve power. Attach file: P1010022.JPG (114.24 KB) |
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Posted on: 2010/6/23 13:04
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| biggrizzly | Re: My '91 on the dyno | ||
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2011 Memorial Day Car Show Winner!
 
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The TPI Intake is awesome Bling Factor compared to others, more power or not!! It just looks faster! I have overheard people at car shows say.... "ooohhh! look at the supercharger" LOL - People are funny sometimes.
Your dyno results are awesome. |
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Posted on: 2010/6/23 15:14
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Don Haller Corvette Club of America 94Coupe, 383Stroka, PeteK Trans, 3000stall, 3.54rear, Konis and bigger sways. |
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| Josh | Re: My '91 on the dyno | ||
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You've definitely got the power for 12's. My 91 went a best of 12.84 @ 106 with ~260 RWHP. What kind of short times are you generating?
Based on the MPH and the dyno chart, I'd guess you were a 6 speed, but I could be wrong. What transmission does the car have? Here's my dyno chart when my car was pretty stock. At the time the car had long tubes, no cats, and a couple other basic mods. The intake was completely stock, no porting, nothing. The heads had never been off the car, stock cam, etc... No frisbee, exhaust mods, and gears. The red line is the car with the factory tune. The blue line is after I tuned it on a dynojet 224. Attach file: Joshtune.JPG (0.00 KB) |
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Posted on: 2010/6/23 23:05
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| Josh | Re: My '91 on the dyno | ||
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It looks like mine made peak power at about 4600. Yours is right about 5,000. I would probably attribute the increase in RPM more to the runners and/or port work on the intake; rather than the cam.
With the same engine configuration and a 60 RWHP shot of nitrous, my car went 11.99 @ 112 (the slip in my avatar). The tune was the biggest thing I did. The car went from 13.5XX at 101 to 12.8/12.9 at 106. It made a bunch more difference on my car than it did on yours though, I picked up 30 RWHP and 50 RWTQ compared to your 11/7 gain. |
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Posted on: 2010/6/23 23:08
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| flyboy | Re: My '91 on the dyno | ||
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The car is automatic,3.08,2400 stall.
The 13.2sec. runs were before the dyno. The 13.09 after. With the improved 60',I would think my e.t. would have been better but I may have been running on battery only as that run was my last when I noticed no charging. The tune was pretty darn good before going on the dyno which is why it picked up (only) 11h.p./7ft.lbs. I think. I have full confidence in the tuner. He spent about 2hrs. with me on the street datalogging /prom burning before the dyno. I'm anxious to give the drag strip one more try on a good (cooler) night. Attach file: P1010001.JPG (144.76 KB) P1010001.JPG (145.08 KB) |
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Posted on: 2010/6/24 1:06
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| 89Vette | Re: My '91 on the dyno | ||
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LMFAO! |
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Posted on: 2010/6/24 3:15
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383 stroker -- Semi-Siamesed SLP long-runner intake, AFR 195's, 4-2-1 headers, and a SR cam. ZF6 short-throw shifter. Custom body/interior. |
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| Josh | Re: My '91 on the dyno | ||
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The 13.2 to 13.0 was all in the first sixty feet. 1.84 is really great on street rubber. Good job man.
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Posted on: 2010/6/24 8:54
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| 88BlackZ51 | Re: My '91 on the dyno | ||
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I would of thought maybe a few more hundred rpm's more then stock, but not 500-600 more. I dont have my old dyno in front of me but I think I peaked around 4300 rpm's several years ago on a dynojet. The last time I dynoed with my stock motor which is long gone (sold it for $1000), it made 240rwhp/330rwtq with no mods internally, and the only real mod worth noting was full exhaust. Love your signature. |
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Posted on: 2010/6/24 10:05
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| 88BlackZ51 | Re: My '91 on the dyno | ||
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You have a good looking (clean) motor. Nice to see that you stuck it out with the long runners, and made decent power. |
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Posted on: 2010/6/24 10:08
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| flyboy | Re: My '91 on the dyno | ||
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I hope I get that elusive 12.9 before something breaks.
A perfect day. A perfect launch. A little luck. |
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Posted on: 2010/6/24 12:41
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| dan0617 | Re: My '91 on the dyno | ||
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Put a set of Nitto drag radials on her. Run them at about 18 psi. Heat them a little before the run (like a 7 sec. burnout). Hold the brake and stand it up on the converter till just before the car creeps forward. When the last yellow lights, very quickly roll the pedal to the floor. Don't mash it or you will risk breaking the rear, although at your power level I doubt you will. You will cut a 1.6X 60' time, and turn something in the 12.8 range. The power and setup is there, you just need to stick it.
I ran many many 1.6X 60' times on my nittos. Never broke the rear till I put the ET street radials on and cut quite a few 1.5X 60' times. Even still, it only broke because it went sideways during a burnout and I jumped out of the gas too quickly. It snapped straight and snapped lots of stuff inside the rear. BTW: Beautiful engine! Disclaimer: This is not an expert opinion. It is the opinion of a beat down redneck who has spilled alot of blood, sweat and beers under the hood of a car that his wife is tired of seeing money disappear on. If you want an expert opinion, please see post #5 of this very thread. |
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Posted on: 2010/6/25 4:17
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ยด89 Vert, 383, 230/236 cam, AFR 195's, LT Headers, HSR intake, 2800 stall, Zex 200 shot, ET Street Radials, tune by me. Runs were with D36 3.07's. On spray, 10.55 @ 132.78, 1.55 60 ft. On motor, 12.08 @ 113.15, 1.66 60 ft. |
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| flyboy | Re: My '91 on the dyno | ||
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Thanks. I'll get there. Nitto 555R 315/35/17. They have the track well prepped on Wednesdays. I never underestimate my ability (to break something). LOL
Attach file: P1010037.JPG (144.18 KB) |
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Posted on: 2010/6/25 11:33
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| Josh | Re: My '91 on the dyno | ||
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The nittos are great, I have a set of 315's on my car as well.
I don't know what kind of experience you have drag racing, so maybe some or all of this is old hat for you, but here's how I would go about it if I were you: Depending on the track, sometimes I can make nearly unlimited passes in one afternoon, hot lapping over and over. Other times, I'm looking at 2-3 passes a night. I would try to find a night where I could make a ton of passes. You've got a D36 (right?) and while Dan and some others have had great luck with them, I would still be nervous. I broke D44 components at the drop a hat with 260 RWHP, so that's the other end of the breakage spectrum compared to Dan. I would start with probably 30 PSI in the nittos, and a small burnout just to clean them off. I would come up on the converter and then roll into the throttle. My goal would be 3-5 tire revolutions, and to have the throttle WOT and the tires hooked by about 10 feet out. I would play with tire pressure and burnout to achieve that. This will not net the fastest 60 foot times, but it will be the easiest on the drive train. If I hit my goal of 3-5 revolutions, and WOT by 10 feet; and I still hadn't touched the 12's, I would starting looking for more hook, and to be more aggressive with my throttle squeeze. Maybe 1-2 revolutions, and WOT withing 2-5 feet. Next would be the Dan method... Hard on the converter, hot tire, low PSI, and look for the dead hook and a quick progression to WOT. Next, hard on the converter and just wood the throttle. Next, back off the converter some, maybe bring the RPM to 1500 or so then wood the car to let the converter flash. This is the hardest on the car, but if the tire will take it this method will produce the best times. I think you'll see your 12's with little to no wheel spin, and something in the neighborhood of a low 1.8 high 1.7 short time. That's all bench racing though, only one way to find out what works for you! Edit - I just re-read my post and I come off like an expert preaching the 'right' way to do stuff. I'm not an expert, on top of that I have a 6 speed, and I have absolutely zero experience drag racing an automatic C4. The above is just how I think I would try to achieve what you are looking for, it may work well, work some, work a little, or not work at all. Good luck with it man, you'll get there. Even if you don't the practice sure is a shit load of fun! |
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Posted on: 2010/6/25 16:28
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| dan0617 | Re: My '91 on the dyno | ||
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Josh has given me excellent advice on launching over the years. He pointed me in the direction of positive camber in rear alignment, removing front sway bar, and snubber extensions on the rear. Those are my only traction mods other than tires. I doubt you need any of that yet, but once you up the converter stall you will.
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This is a great starting and learning point but never yielded the results I was looking for. Quote:
This yielded me very satisfying results. Try about 20 psi in the nittos, bet you will end up at around 18. Quote:
Only had the balls to try this once, and it didn't give me any better times. I thought for sure it did, but it didn't. Felt VERY hard on my shit and I didn't want to break anything 1.5 hours from home at the dragstrip. Josh is king of putting it to the wood and worrying about damage later. Wish I could do that. I just can't. Quote: Next, back off the converter some, maybe bring the RPM to 1500 or so then wood the car to let the converter flash. This is the hardest on the car, but if the tire will take it this method will produce the best times. NEVER had the balls to try this, but I have a 2800 stall converter. Flashing a higher stall means something has to give. I now have a D44 so maybe I'll try this eventually. If you are running a stock or near stock converter this might work best for you. Quote: Edit - I just re-read my post and I come off like an expert preaching the 'right' way to do stuff. I'm not an expert, on top of that I have a 6 speed, and I have absolutely zero experience drag racing an automatic C4. The above is just how I think I would try to achieve what you are looking for, it may work well, work some, work a little, or not work at all. My disclaimer: Ditto. Only I don't have a 6 speed. Can we get an "Expert Opinion" in here? lol. Good luck at the track and keep us posted. I'm sure mid upper 12's will be yours. |
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Posted on: 2010/6/25 17:09
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ยด89 Vert, 383, 230/236 cam, AFR 195's, LT Headers, HSR intake, 2800 stall, Zex 200 shot, ET Street Radials, tune by me. Runs were with D36 3.07's. On spray, 10.55 @ 132.78, 1.55 60 ft. On motor, 12.08 @ 113.15, 1.66 60 ft. |
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| Josh | Re: My '91 on the dyno | ||
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Thanks Dan.
Are you hitting the extended snubbers on your car? |
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Posted on: 2010/6/26 14:56
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| dan0617 | Re: My '91 on the dyno | ||
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Yes I am hitting them. Fairly hard by the looks of it. I forget how long you suggested I make them but I decided to make them like 3/8" longer than that. I figure if I lose traction from hitting them it is better than the 1/2 shafts not being level when I hit the spray 15' out of the gate. |
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Posted on: 2010/6/29 1:55
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ยด89 Vert, 383, 230/236 cam, AFR 195's, LT Headers, HSR intake, 2800 stall, Zex 200 shot, ET Street Radials, tune by me. Runs were with D36 3.07's. On spray, 10.55 @ 132.78, 1.55 60 ft. On motor, 12.08 @ 113.15, 1.66 60 ft. |
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| Josh | Re: My '91 on the dyno | ||
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It's probably different for every car a little bit. The best way to figure out the 'correct' length is to put the car on jack stands so the rear suspension droops. Then, put a jack under one of the rear knuckles and jack it up until the half shaft is level. That's the point where you want the snubber to contact the knuckle.
That way, when you ride the snubber, the shaft is level, and you've got the maximum strength possible out of the independent set up. |
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Posted on: 2010/6/29 12:23
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| Raidmagic | Re: My '91 on the dyno | ||
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Great info. I keep threating to bring my car to the track but something always comes up and I don't go. Maybe I'm protecting myself from dissapointment.  Either way when I do go I'll be following this advice and we'll see if she runs hard or comes home on a trailer.  |
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Posted on: 2010/6/29 18:08
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| flyboy | Re: My '91 on the dyno | ||
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[quote]
Josh wrote: Next, back off the converter some, maybe bring the RPM to 1500 or so then wood the car to let the converter flash. This is the hardest on the car, but if the tire will take it this method will produce the best times. I did my three passes right away before the waiting lines backed up and then watched from the stands as I had met my goal. I'll probably go back one more time this summer because that 109.22 trap speed tells me maybe I can improve that E.T. a little. Attach file: P1010001.JPG (120.29 KB) P1010011.JPG (143.76 KB) |
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Posted on: 2010/7/1 17:37
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| Matatk | Re: My '91 on the dyno | ||
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12.84 on the second run and 109 mph on the third run are very impressive! Don't forget to add them to the 1/4 mile sheet in the drag racing section!
Matthew |
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Posted on: 2010/7/1 18:24
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| BrianCunningham | Re: My '91 on the dyno | ||
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Congrats!
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Posted on: 2010/7/1 19:58
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Polo Green 95 LT1 6-spd http://mysite.verizon.net/vzevcp74/ 383 LT1/Vortech Supercharger/AFR heads/Rod end suspension/Penske-Hardbar dual rate coilovers/Wilwood 6pot brakes NCCC Governor: http://BayStateCorvetteClub.com |
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| BeachBum | Re: My '91 on the dyno | ||
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That left lane is a Happy Lane.... no incremental et pick-up, but yet a 3 mph improvement vs the other passes....
Congrats on the good racing !!.... you definitely have another tenth or two to wring-out of it.... keep going ! |
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Posted on: 2010/7/1 21:36
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| flyboy | Re: My '91 on the dyno | ||
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Thanks. Astute observation. May 18 I made 16 passes only 2 of which were in the left and both were 2 MPH faster. |
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Posted on: 2010/7/1 21:51
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| BeachBum | Re: My '91 on the dyno | ||
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MPH variances of that degree are rare for an automatic transmission....typicially, at your power level, you'll pick-up around 20-22 mph consistently in the 2nd half of the track. Picking up 25 mph is not normal. My old 383 motor would pick-up 24-25 mph religiously... never 23.xxx or 26.xxx, always 24-25, usually 24.50.... thus a 92 mph 1/8th would be 116.50 mph. But, its normal, a lot of tracks have a bit of variance.... I do not know why though... considering all are measuring the average MPH for the last 66 ft of the track..... but, it is what it is. Congrats on the good racing ! |
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Posted on: 2010/7/2 0:01
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| Josh | Re: My '91 on the dyno | ||
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It's a little weird that the highest MPH run was the slowest MPH in the 1/8 mile.
You were 2 MPH slower, but 3 MPH faster on the big end. So, the car picked up 5 MPH over previous runs on the last half of the track. That's a 30+ HP difference at least. Have you data logged the car? I wonder if it's pulling timing somewhere in the runs and bringing the power down. Or, maybe the 1/8 mile timer is a little early in the left lane. You were .06 faster in the 60 foot on pass 2 than pass 3. With my car, every increment gained in the 60 foot was a reduction in ET at a factor of 1.59. So, .06 gain at the 60 foot marker should be worth approximately .095 total ET. You were about .08 different in 1/8 mile ET, so again that points to the 1/8 mile timers being a little out of whack in the left lane. Of course, that's all BS and speculation, it could just a be "one of those things." I wouldn't sweat it too much. 1.7XX is great for a street tire. Keep after it and see what you can get out of it! |
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Posted on: 2010/7/2 3:52
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| flyboy | Re: My '91 on the dyno | ||
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Thank you all for your observations. I see there is more to a time slip than meets the (my untrained) eye. The tuner said all was well with the timing advance. My TCI "Breakaway" +-2400 stall T.C. seems to not always function perfectly consistent at WOT. I wonder....
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Posted on: 2010/7/2 12:37
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'91coupe, LT4Hotcam, some other stuff. If it's too loud, you're too old. "He works on old cars, then junks 'em" |
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| PeteK | Re: My '91 on the dyno | ||
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My experience with TCI converters is that they build a ton of endplay into the converter to achieve the desired stall. This extra endplay causes extra heat, especially as the hotlapping gets quicker at the end of the day (or night) at the strip. This tends to causes consistency to go away. Do what you can to keep things cool. Add a cooler if you dont have one, and a spray jug with cold water can be used to cool down the cooler between rounds.
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Posted on: 2010/7/2 12:51
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"It was really on a pass until it came apart." "Yeah. They always are." |
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| flyboy | Re: My '91 on the dyno | ||
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Thanks, PeteK. I see a trans. cooler on the horizon.
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Posted on: 2010/7/2 13:04
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| PeteK | Re: My '91 on the dyno | ||
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Nothing fancy or expensive is required. The biggest one you can fit in the available space works, and is inexpensive. Not too hard to install either. |
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Posted on: 2010/7/2 13:08
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"It was really on a pass until it came apart." "Yeah. They always are." |
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| BeachBum | Re: My '91 on the dyno | ||
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I ran a 12" TCI Breakaway for about a month years back..... horrible converter in my opinion. I only say that because my 60's were horrible with it.... my stock 85 converter produced more or less identical 60's. (Albeit, the 85 converter is a little looser than most other stock converters).... I got rid of it and soon as I figured out the converter was the guilty party responsible for my less than stellar 60 fts. As a note, I have a B&M trans cooler mounted in front of the radiator. Going out of memory, I paid something like $ 50 for the cooler about 12 years ago.... As Pete said, they're easy to mount, can be done in an hour. good luck ! |
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Posted on: 2010/7/2 13:39
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| flyboy | Re: My '91 on the dyno | ||
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I put one on years ago, I think I got it out of a refrigerator. Assuming the cooler built into the Dewitt's radiator is marginal, there is room in front of the condenser. Maybe I can tee off the lines at the radiator fittings?
I do leave my manually switched secondary cooling fan on at the track to help keep temps down (and it does). |
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Posted on: 2010/7/2 14:39
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'91coupe, LT4Hotcam, some other stuff. If it's too loud, you're too old. "He works on old cars, then junks 'em" |
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| PeteK | Re: My '91 on the dyno | ||
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Zip tie it to the front of the condenser. Easy, and it will get the most airflow. |
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Posted on: 2010/7/2 15:37
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"It was really on a pass until it came apart." "Yeah. They always are." |
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| flyboy | Re: My '91 on the dyno | ||
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10-4 |
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Posted on: 2010/7/2 15:48
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