tuning for auto transmission - CorvetteForum - Chevrolet Corvette Forum Discussion

Notices
C6 Scan & Tune Onboard Diagnostics, Service Advice, Dyno Tuning, and Fuel Management for the Corvette
Sponsored by:
Sponsored by:

tuning for auto transmission

Old 08-04-2018, 01:58 PM
  #1  
SkittlesRgood
Junior Member
Thread Starter
 
Member Since: Dec 2017
Location: San Jose, CA
Posts: 49
Thanks: 0
Thanked 1 Time in 1 Post
Default tuning for auto transmission

There's one thing I want my vette to do differently. When you're cruising in 6th and want to down shift to say 3rd; you pop it into sport mode and hit the paddle shifter 3 times... and wait as it carefully goes through the gears. This often means the car down shifts while I'm in a turn instead of just before the turn. Is this something that can be changed with a tune? Can the car just jump to whatever gear you tell it to?

2007 base.
SkittlesRgood is offline  
Old 08-05-2018, 02:19 PM
  #2  
craigyboy
Junior Member
 
Member Since: May 2009
Posts: 33
Thanks: 0
Thanked 4 Times in 4 Posts
Default

Yes, a tuner can speed up the gear change for you
craigyboy is offline  
Old 08-06-2018, 09:00 AM
  #3  
jim2092
CF Senior Member
Support Corvetteforum!
 
jim2092's Avatar
 
Member Since: Jan 2005
Location: Tucson Arizona
Posts: 1,436
Thanked 71 Times in 52 Posts
St. Jude Donor '08
Default

No. Start downshifting a little sooner, it cannot jump gears.
jim2092 is offline  
Old 08-09-2018, 10:44 PM
  #4  
zrracer
CF Senior Member
 
zrracer's Avatar
 
Member Since: Jan 2001
Location: palm harbor/murphy Fl/NC
Posts: 1,602
Thanked 54 Times in 52 Posts
St. Jude Donor '11, '14
Default

Also a tuner can not make the car shift faster. He can make it shift harder.
zrracer is offline  
Old 08-09-2018, 10:46 PM
  #5  
[email protected]
Supporting Vendor
 
subfloor@centurytrans's Avatar
 
Member Since: Feb 2011
Posts: 2,066
Thanked 158 Times in 128 Posts
Default

Originally Posted by zrracer View Post
Also a tuner can not make the car shift faster. He can make it shift harder.
Uh, yeah he can. Shift times are one of the easiest things to modify in the trans tune.
subfloor@centurytrans is offline  
Old 08-09-2018, 10:54 PM
  #6  
SkittlesRgood
Junior Member
Thread Starter
 
Member Since: Dec 2017
Location: San Jose, CA
Posts: 49
Thanks: 0
Thanked 1 Time in 1 Post
Default

Originally Posted by zrracer View Post
Also a tuner can not make the car shift faster. He can make it shift harder.
Originally Posted by [email protected] View Post
Uh, yeah he can. Shift times are one of the easiest things to modify in the trans tune.
Hmm... Looks like there's at least some hope then? Guess I'll just have to find a tuner and find out.
SkittlesRgood is offline  
Old 08-10-2018, 03:28 PM
  #7  
jim2092
CF Senior Member
Support Corvetteforum!
 
jim2092's Avatar
 
Member Since: Jan 2005
Location: Tucson Arizona
Posts: 1,436
Thanked 71 Times in 52 Posts
St. Jude Donor '08
Default

Subfloor is a tuner and he is close to you.
jim2092 is offline  
Old 08-16-2018, 08:07 PM
  #8  
mellojoe
CF Senior Member
 
mellojoe's Avatar
 
Member Since: Feb 2018
Location: Arizona
Posts: 212
Thanked 28 Times in 22 Posts
Default

Originally Posted by [email protected] View Post
Uh, yeah he can. Shift times are one of the easiest things to modify in the trans tune.
Can you elaborate on this? Does the stock ECU have a built in delay or something? I know tuners can change shift points, but I didn't know they could improve the speed of the shifts. I had assumed this was a limitation of the mechanical bits, and not something programmed into the computer.
mellojoe is offline  
Old 08-17-2018, 02:11 PM
  #9  
[email protected]
Supporting Vendor
 
Mike@DiabloSport's Avatar
 
Member Since: Sep 2009
Location: SoFla Fl
Posts: 1,812
Thanked 41 Times in 33 Posts
Default

Shift speed can indeed be adjusted in the tune.
To clarify, this is the amount of time it takes to perform the actual shift, has nothing to do with the delay from when you click the paddle to when the trans 'does something'

Is holding the downshift paddle not an option to downshift to the lowest available gear in these cars?
In my charger I can simply hold the downshift paddle for a second and it automatically drops to the lowest/safe gear based on speed. Roll race special
I don't recall if my T43 equipped Caddy had the same option or not...
Mike@DiabloSport is offline  
Old 08-19-2018, 09:29 AM
  #10  
jim2092
CF Senior Member
Support Corvetteforum!
 
jim2092's Avatar
 
Member Since: Jan 2005
Location: Tucson Arizona
Posts: 1,436
Thanked 71 Times in 52 Posts
St. Jude Donor '08
Default

Yes, if the left (-) minus paddle is held down briefly, the transmission will downshift to the lowest gear possible for the vehicle speed. And if the paddle continues to be held down as the vehicle slows, downshifts will continue to occur as vehicle speed allows.
jim2092 is offline  
The Following User Says Thank You to jim2092 For This Useful Post:
2FAST4U (09-08-2018)
Old 08-19-2018, 12:10 PM
  #11  
SkittlesRgood
Junior Member
Thread Starter
 
Member Since: Dec 2017
Location: San Jose, CA
Posts: 49
Thanks: 0
Thanked 1 Time in 1 Post
Default

Originally Posted by jim2092 View Post
Yes, if the left (-) minus paddle is held down briefly, the transmission will downshift to the lowest gear possible for the vehicle speed. And if the paddle continues to be held down as the vehicle slows, downshifts will continue to occur as vehicle speed allows.
whaaaaaattt??? it does that stock? time for a test drive!
SkittlesRgood is offline  
Old 08-20-2018, 09:29 AM
  #12  
jim2092
CF Senior Member
Support Corvetteforum!
 
jim2092's Avatar
 
Member Since: Jan 2005
Location: Tucson Arizona
Posts: 1,436
Thanked 71 Times in 52 Posts
St. Jude Donor '08
Default

Typed right out of the owners manual.
jim2092 is offline  
Old 08-20-2018, 12:38 PM
  #13  
SkittlesRgood
Junior Member
Thread Starter
 
Member Since: Dec 2017
Location: San Jose, CA
Posts: 49
Thanks: 0
Thanked 1 Time in 1 Post
Default

Originally Posted by jim2092 View Post
Typed right out of the owners manual.
Tried it. Didn't work. it just down shifted once. tried holding the left - tried the right - tried both at once. held them down for at least 5 seconds, nothing happened. Maybe this isn't a feature on an 07? They changed the firmware after 08 right?
SkittlesRgood is offline  
Old 08-21-2018, 12:27 PM
  #14  
jim2092
CF Senior Member
Support Corvetteforum!
 
jim2092's Avatar
 
Member Since: Jan 2005
Location: Tucson Arizona
Posts: 1,436
Thanked 71 Times in 52 Posts
St. Jude Donor '08
Default

My apologies. That is a C7 feature.
jim2092 is offline  
Old 08-21-2018, 01:12 PM
  #15  
SkittlesRgood
Junior Member
Thread Starter
 
Member Since: Dec 2017
Location: San Jose, CA
Posts: 49
Thanks: 0
Thanked 1 Time in 1 Post
Default

Originally Posted by jim2092 View Post
My apologies. That is a C7 feature.
tease
SkittlesRgood is offline  
Old 08-29-2018, 03:24 PM
  #16  
Rdwarprbill
Junior Member
 
Member Since: Apr 2018
Posts: 8
Thanked 0 Times in 0 Posts
Default Can Diablo tune change rpm shift points?

Originally Posted by [email protected] View Post
Shift speed can indeed be adjusted in the tune.
To clarify, this is the amount of time it takes to perform the actual shift, has nothing to do with the delay from when you click the paddle to when the trans 'does something'

Is holding the downshift paddle not an option to downshift to the lowest available gear in these cars?
In my charger I can simply hold the downshift paddle for a second and it automatically drops to the lowest/safe gear based on speed. Roll race special
I don't recall if my T43 equipped Caddy had the same option or not...
Hi, I have your Diablo tine in my 08 vette with LS3 motor. At WOT the motor cuts out (rpm limiter) before the tranny shifts. Can I change trans rpm shift points?
Rdwarprbill is offline  
Old 08-29-2018, 04:20 PM
  #17  
[email protected]
Supporting Vendor
 
Mike@DiabloSport's Avatar
 
Member Since: Sep 2009
Location: SoFla Fl
Posts: 1,812
Thanked 41 Times in 33 Posts
Default

Yes, you can adjust the WOT shift RPM on that application. Id suggest bumping the limiter a bit first.

Thanks
Mike@DiabloSport is offline  
Old 09-05-2018, 01:06 PM
  #18  
Rdwarprbill
Junior Member
 
Member Since: Apr 2018
Posts: 8
Thanked 0 Times in 0 Posts
Default WOT engine cuts out

Originally Posted by [email protected] View Post
Yes, you can adjust the WOT shift RPM on that application. Id suggest bumping the limiter a bit first.

Thanks
thanks for your re Mike...I'm a bit Leary about bumping the rev limiter over the rpm limit. Would rather change the tranny shift points. Is that feature of n mu Diablo tune or do I have to download it from the Ignition icon?
Rdwarprbill is offline  
Old 09-05-2018, 01:11 PM
  #19  
[email protected]
Supporting Vendor
 
Mike@DiabloSport's Avatar
 
Member Since: Sep 2009
Location: SoFla Fl
Posts: 1,812
Thanked 41 Times in 33 Posts
Default

Is this a stock car?
Are you asking about lowering the shift points to keep it from hitting the limiter?

If the shift points and limiters are all stock, and it hits the limiter in D on any shift, there's more likely a possible trans issue that needs to be addressed here...
Mike@DiabloSport is offline  
Old 09-15-2018, 10:56 AM
  #20  
Dcasole
CF Senior Member
 
Dcasole's Avatar
 
Member Since: Oct 2014
Location: Atlanta GA
Posts: 4,206
Thanked 625 Times in 540 Posts
Default

Mike , I think he is waiting to long to flip the paddle causing the car to bang the revlimiter because of the delay time

While running a road course I would just anticipate the delay and bump the paddle a little sooner

when I installed my Diablo Lew Tune ...and running the 1/4 mile I just left the shifter in automatic sport and let the trans do the shifting ... it shifted right on the redline every time

Dave

Last edited by Dcasole; 09-15-2018 at 10:57 AM.
Dcasole is offline  

Thread Tools
Search this Thread
Sponsored Ads
Vendor Directory

Contact Us About Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: