Very disappointing track times...
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Very disappointing track times...
I took the Corvette to South Georgia Motorsports Park tonight and ran three 12.8 at 112 mph. According to the DA calc the DA was about 2000 ft.
The car dyno'd 375 rwhp and 378 rwtq. It's a 2007, 28k miles, a6 and has a Calloway Honker, Peak Speed ported FAST 102, LG Motorsports 1 3/4" headers, and B&B PRT. Stock converter on street tires. It dead hooks on launch and shifts.
I get that the ET isn't great but the mph is what concerns me. The tuner said he left in the torque management because it's my wife's car and he didn't want the shifts to be harsh. Could this be the culprit? Thoughts?
The car dyno'd 375 rwhp and 378 rwtq. It's a 2007, 28k miles, a6 and has a Calloway Honker, Peak Speed ported FAST 102, LG Motorsports 1 3/4" headers, and B&B PRT. Stock converter on street tires. It dead hooks on launch and shifts.
I get that the ET isn't great but the mph is what concerns me. The tuner said he left in the torque management because it's my wife's car and he didn't want the shifts to be harsh. Could this be the culprit? Thoughts?
Last edited by Chrisguga; Jul 16, 2016 at 10:00 PM.
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He's a pretty well known tuner and I drove nearly 3 hours each way for him to tune the car. He has a lot of good reviews on this forum.
It's been frustrating all around because I went out and tried to buy good parts and the end result from dyno to track has been disappointing.
It's been frustrating all around because I went out and tried to buy good parts and the end result from dyno to track has been disappointing.
Instructor
Joined: Apr 2015
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From: columbia missouri
He's a pretty well known tuner and I drove nearly 3 hours each way for him to tune the car. He has a lot of good reviews on this forum.
It's been frustrating all around because I went out and tried to buy good parts and the end result from dyno to track has been disappointing.
It's been frustrating all around because I went out and tried to buy good parts and the end result from dyno to track has been disappointing.
I was kind of thinking the same thing. Maybe the dyno just reads on the lower side, but a low dyno number and low mph probably means low hp (for your mods).
Instructor
Joined: Apr 2015
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From: columbia missouri
Maybe you gained some weight since then.
haha Yeah, the Trans Am was probably a couple hundred pounds heaver. Here is a thread from 05 I found about stock 1/4 miles. https://www.corvetteforum.com/forums...rformance.html
Did you just do one run, or did you do multiple?
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3 runs, all 12.8 at 112.
I did all the work on the car myself, tried to pick good parts, and have plans to continue modding the car further. I guess that's why these results are so frustrating. I've spent many hours working on the damn thing, busting knuckles, and trying not to skimp on anything. Then, it runs stock times. Demoralizing to say the least.
I did all the work on the car myself, tried to pick good parts, and have plans to continue modding the car further. I guess that's why these results are so frustrating. I've spent many hours working on the damn thing, busting knuckles, and trying not to skimp on anything. Then, it runs stock times. Demoralizing to say the least.
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Burning Brakes
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Is it faster then before the mods? If so then your work was not in vain. If you are not a drag veteran, perhaps it is something as simple as reaction time. That would not account for the low trap speed however. I don't know. I hear of stockers going to the track and being disappointed because their times are in the 13s. Did you do a dyno before and after mods?
Last edited by Sledge Hammer; Jul 17, 2016 at 09:16 PM.
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From: Southampton NJ
Is it faster then before the mods? If so then your work was not in vain. If you are not a drag veteran, perhaps it is something as simple as reaction time. That would not account for the low trap speed however. I don't know. I hear of stockers going to the track and being disappointed because their times are in the 13s. Did you do a dyno before and after mods?
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Is it faster then before the mods? If so then your work was not in vain. If you are not a drag veteran, perhaps it is something as simple as reaction time. That would not account for the low trap speed however. I don't know. I hear of stockers going to the track and being disappointed because their times are in the 13s. Did you do a dyno before and after mods?
I used to race my Trans Am 10+ years ago quite a bit.
Safety Car
Joined: Feb 2007
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From: Opelika Alabama
he doesn't say anywhere what year car? stock LS2 is about 347 with a manual, my MN6 LS2 intake {K&N} roller rockers, very mild cam PP TB, 391 RWHP 389 RWTQ if he had it tuned North of Atlanta, he had it tuned by one of the best IMHO, 20011 LS3?" 400 bone stock"? You better find another tuner because your guy is really blowing smoke up your ***! after your tune what he tell you? You were getting 475?
Last edited by CMY SIX; Jul 18, 2016 at 09:48 AM.
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From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
With the mods you have, there is no reason short of a poor tune, that would keep you from running low 11's around the 124-126 area. I'm guessing who the tuner is, is not a racer, because the people who like him don't race either.
Find the good racers at the track and get recommendations of local tuners.
Launch method is turn off TC, select S, but don't touch the paddles, power brake to 1200, then release brake and nail the skinny pedal. Assuming the tune didn't change the shift points, it'll shift 200 RPM higher than in D and the shifts will be quicker. Although, if it's the tuner I suspect, make sure the new guy puts in a 100% full stock tune, before making any changes.
Find the good racers at the track and get recommendations of local tuners.
Launch method is turn off TC, select S, but don't touch the paddles, power brake to 1200, then release brake and nail the skinny pedal. Assuming the tune didn't change the shift points, it'll shift 200 RPM higher than in D and the shifts will be quicker. Although, if it's the tuner I suspect, make sure the new guy puts in a 100% full stock tune, before making any changes.
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From: Lewisville TX
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13
What was DA of the track that night? If it is 90 degrees and 100% humidity I wouldn't expect good times either.
60' time?
375 rwhp on an LS2 auto car doesn't sound horrible. Car only put down 325-335 rwhp bone stock through the auto. My 2006 M6 car only did 357 stock...385 with headers, cai and tune. I don't think your off power wise, or at least not out of the ball park.
60' time?
375 rwhp on an LS2 auto car doesn't sound horrible. Car only put down 325-335 rwhp bone stock through the auto. My 2006 M6 car only did 357 stock...385 with headers, cai and tune. I don't think your off power wise, or at least not out of the ball park.
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Thanks for the tips, guys.
The tune didn't come from Vengeance Racing. I thought about using them and probably should have, but they had a 1 month waiting list to get a tune.
I really don't know if the shop I used has a lot of fast cars come out of there. I was slightly disappointed by my dyno numbers, but it is an A6 LS2 so I figured the numbers were reasonable and it would run a good number at the track. Then it ran even worse than the dyno numbers.
I only ran 3 times because the times were consistent and disappointing. The 60' was always between 1.95 and 2.0, dead hooking. I went off idle once, foot braking to about 1200 once, and foot braking as much as the brakes would hold once. The drag times DA calculator said the DA was in the low 2000 foot range at the time of the runs.
The car pulls smoothly and runs well in daily driving. I'll take it back to the track in a few weeks and see if I can get it to run a better number in S and with a better DA. I just ran some Seafoam through the gas tank and some Mopar combustion chamber cleaner through it to see if that will help.
I want to get a torque converter and trans cooler, but I'm not going to do more mods until I get the car sorted as it sits now.
The tune didn't come from Vengeance Racing. I thought about using them and probably should have, but they had a 1 month waiting list to get a tune.
I really don't know if the shop I used has a lot of fast cars come out of there. I was slightly disappointed by my dyno numbers, but it is an A6 LS2 so I figured the numbers were reasonable and it would run a good number at the track. Then it ran even worse than the dyno numbers.
I only ran 3 times because the times were consistent and disappointing. The 60' was always between 1.95 and 2.0, dead hooking. I went off idle once, foot braking to about 1200 once, and foot braking as much as the brakes would hold once. The drag times DA calculator said the DA was in the low 2000 foot range at the time of the runs.
The car pulls smoothly and runs well in daily driving. I'll take it back to the track in a few weeks and see if I can get it to run a better number in S and with a better DA. I just ran some Seafoam through the gas tank and some Mopar combustion chamber cleaner through it to see if that will help.
I want to get a torque converter and trans cooler, but I'm not going to do more mods until I get the car sorted as it sits now.
Last edited by Chrisguga; Jul 18, 2016 at 11:50 AM.
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From: Lewisville TX
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13
https://www.corvetteforum.com/forums...op-speeds.html
Chevy quoted times on the 2005 car. Same engine but different trans and diff. HP would have been the same.
4-spd auto tranny w Z51 12.9 sec @ 110 mph
4-spd auto tranny w/o Z51 13.0 sec @ 110 mph
Now that isn't very scientific because it isn't the same car, same track, same day before and after the mods. More than likely GM's times are going to be in more than ideal weather conditions.
Chevy quoted times on the 2005 car. Same engine but different trans and diff. HP would have been the same.
4-spd auto tranny w Z51 12.9 sec @ 110 mph
4-spd auto tranny w/o Z51 13.0 sec @ 110 mph
Now that isn't very scientific because it isn't the same car, same track, same day before and after the mods. More than likely GM's times are going to be in more than ideal weather conditions.
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https://www.corvetteforum.com/forums...op-speeds.html
Chevy quoted times on the 2005 car. Same engine but different trans and diff. HP would have been the same.
4-spd auto tranny w Z51 12.9 sec @ 110 mph
4-spd auto tranny w/o Z51 13.0 sec @ 110 mph
Now that isn't very scientific because it isn't the same car, same track, same day before and after the mods. More than likely GM's times are going to be in more than ideal weather conditions.
Chevy quoted times on the 2005 car. Same engine but different trans and diff. HP would have been the same.
4-spd auto tranny w Z51 12.9 sec @ 110 mph
4-spd auto tranny w/o Z51 13.0 sec @ 110 mph
Now that isn't very scientific because it isn't the same car, same track, same day before and after the mods. More than likely GM's times are going to be in more than ideal weather conditions.
That's depressing to think that I'm running a tenth and 2 mph faster than their test car after investing in the Calloway Honker, ported FAST 102, LG long tubes, B&B exhaust, a custom tune, Koni FSD Gold shocks, new tires, alignment, thermostat, new alternator, tensioner pulley, belt, battery, z51 brakes, etc.
I realize that all this doesn't necessarily effect the 1/4 mile time, but I've literally changed every little thing on the car to make it perfect and I'm rewarded with a 12.8.
Figures. Back in 1999 I had a bit of a freak and my 1999 Trans Am that I bought new ran a 12.7 at 111 with a lid, cutout, and shifter. It figures I'd get the other end of the spectrum now.