tech question
Thread Starter
Heel & Toe
Joined: Jan 2008
Posts: 22
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From: LA CA
tech question
I have a 08 Auto z51 ls3 vette and so do my friends when i flor the car at 30mpr my car lags on down shifting as to theirs doesnt it just books it does any one know why this would happen? when i took it in to get checked the dealer did their thing and said every thing is normal but i know that something is not rigth, can some one please explain what it could be?
Moderator
Joined: Dec 2002
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From: Lakewood Ranch, FL
I have a 08 Auto z51 ls3 vette and so do my friends when i flor the car at 30mpr my car lags on down shifting as to theirs doesnt it just books it does any one know why this would happen? when i took it in to get checked the dealer did their thing and said every thing is normal but i know that something is not rigth, can some one please explain what it could be?
Race Director
Joined: Sep 2001
Posts: 11,907
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From: Between a rock and a hard place, S.E. PA
Your friends is an A6 too, correct? My 07 and most others I've spoken to do the same thing. It's the single most annoying thing about the entire car. Upshifts are fine, but it lays down like a dog when it drops a gear or two with your foot in it.
Drifting
Joined: Jul 2002
Posts: 1,262
Likes: 7
From: Kissimmee, FL
The tranny only "learns" in drive so if you don't teach it to be agressive in "D" it won't shift the way you want it to. I have read posts saying that if you drive it agresssivly in drive it will fix the shift problem you describe. Hope that helps!
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Race Director
Joined: Sep 2001
Posts: 11,907
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From: Between a rock and a hard place, S.E. PA
The PT & WOT shift tables are identical for D & S. I cannot attest how the learning may effect either. It's "possible" there could be modifier tables but that info is not available with HPtuners (yet).
Race Director
Joined: Sep 2001
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From: Between a rock and a hard place, S.E. PA
Burning Brakes
Joined: Nov 2007
Posts: 1,083
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From: Buena Park CA
I noticed the same annoying thing. I thought after I installed a FAST and a VaraRam, this problem became apparent, but not so because others have noticed it when stock, therefore, they say it's just the nature of the trans. I have a DiabloSport 91-Octane tune which didn't seem to fix anything either, so I'm not sure how to overcome that, but I'm sure there must be a way....
Melting Slicks
Joined: Feb 2006
Posts: 2,261
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From: Brentwood CA
To my point - when driving a manual, you've got to be ready for the power to come on when hitting the throttle and dumping the clutch. With TM disabled in an auto, it is the same feeling. You had better be ready for power when you put your foot to the pedal. 
Race Director
Joined: Sep 2001
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From: Between a rock and a hard place, S.E. PA
Fair enough, but we agree, turning off TM for ALL shifts is like dumping the clutch for every shift. Can't say I've ever driven a manual and wanted to dump the clutch for every shift. I guess I'm just a control freak.
Just out of couriosity, did you ever wonder why your tuner disabled garage shift TM?
Just out of couriosity, did you ever wonder why your tuner disabled garage shift TM?
Last edited by C5pilot; Jan 20, 2008 at 10:51 PM.
Melting Slicks
Joined: Feb 2006
Posts: 2,261
Likes: 1,431
From: Brentwood CA
Fair enough, but we agree, turning off TM for ALL shifts is like dumping the clutch for every shift. Can't say I've ever driven a manual and wanted to dump the clutch for every shift. I guess I'm just a control freak.
Just out of couriosity, did you ever wonder why your tuner disabled garage shift TM?
Just out of couriosity, did you ever wonder why your tuner disabled garage shift TM?
The reason we disabled everything is because we wanted to make sure we were getting the best performance. Even though it says Garage Shift, he was not convinced it might not have some sort of effect on other shift paramenters. Bottom line, we really couldn't tell much difference when making a garage shift (going from park to drive) with "Garage Shift" disabled so we just decided to keep it disabled. Hope this helps.
Thread Starter
Heel & Toe
Joined: Jan 2008
Posts: 22
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From: LA CA
im thinkin the reason why my car is the way it is, is because no two cars are alike when they come out of factory im guessing they messed up on my factory tune and an a custom tune will fix my problem. What do you think? and if so who do you recomend for a custom tune?
Thanks!
Thanks!
Melting Slicks
Joined: Feb 2006
Posts: 2,261
Likes: 1,431
From: Brentwood CA
im thinkin the reason why my car is the way it is, is because no two cars are alike when they come out of factory im guessing they messed up on my factory tune and an a custom tune will fix my problem. What do you think? and if so who do you recomend for a custom tune?
Thanks!
Thanks!
Absolutely, have it tuned!!! I don't think they messed up your factory tune, that's just the way they come. My Vette is basically stock. I had it tuned and it really woke up my car. My tuner not only tuned the engine, but the tranny as well. We changed the shift points so that it shifts at around 2000 rpm’s in each gear along with disabling TM. No more hesitation when jumping on it and the shifts are hard and strong. I highly recommend a tune even if your car is stock.
Melting Slicks
Joined: Sep 2007
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From: --- N.E., Pa.