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turtleman
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PostSubject: transmission tuning   Tue Oct 21, 2008 8:48 pm

I just had a quick question but I figured I'd leave the title more broad so it might be more useful.

What is the stock transmission fluid pressure and what are you tuners running it at?
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deekster_caddy
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PostSubject: Re: transmission tuning   Wed Oct 22, 2008 12:22 pm

Not an easy question. I actually installed a pressure gauge once, to the port right next to the vent on top of the transmission. Pressure changes all the time, based on load, gear selector position, etc. In the tuning software we can generally only set the pressure in terms of percentage of pressure solenoid position, i.e. we can choose 0-100%, but in general we don't have access to the full transmission tables, so you can't change this everywhere.

I saw pressure anywhere from 60psi to 220 psi on my pressure gauge.
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AA
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PostSubject: Re: transmission tuning   Wed Oct 22, 2008 1:59 pm

Limit is supposed to be 96 PSI. I've never seen the PCM report anything higher (from wherever it's measured). The pressure is regulated in steps, based on calculated torque, so it varies constantly as you pout more load on the transmission. Generally you want less pressure at less load, and more pressure under higher torque (WOT). Setting the table is a find balance that is based on your shift points, driving habits, and personal preference. It took me a full year to nail down a pressure curve that works with my normal driving as well as high-demand performance. If you do it right, you can have "performance shift" when you need it without pressing any buttons.

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'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


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deekster_caddy
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PostSubject: Re: transmission tuning   Wed Oct 22, 2008 2:09 pm

AA, I think that's a mistake in the PT. It says PSI, but I think it's supposed to say %.
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AA
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PostSubject: Re: transmission tuning   Wed Oct 22, 2008 3:55 pm

Interesting, I never knew that. Now I want to know why my transmission can't give me 100%.

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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http://www.cardomain.com/ride/657082/4
albertj
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PostSubject: Re: transmission tuning   Wed Oct 22, 2008 5:06 pm

torque converter losses. don't sweat it...

Albertj
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BillBoost37
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PostSubject: Re: transmission tuning   Mon Oct 27, 2008 2:11 pm

Stock looks to be 96psi, but HPT will accept 100%
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turtleman
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PostSubject: Re: transmission tuning   Mon Oct 27, 2008 4:25 pm

The reason I really posted about this was I see something like "trans line pressure increased for yadda yadda performance gains" as a basic piece of the tune all the vendors sell and it's not fully apparent to me, what they are actually referring to but I know I noticed a difference at one point when I had an intense S1 pcm for a couple days.

Looking back, it's hard to tell the detail of that diffence enough to compare it to my tune I did now (shortened shift times and such) I do see that value showing "96" in my program. So thats all that is? I just know I recal people saying the first thing is to simply bump up line pressure (in general)
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AA
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PostSubject: Re: transmission tuning   Mon Oct 27, 2008 5:42 pm

What year is your car again, Codith?

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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http://www.cardomain.com/ride/657082/4
turtleman
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Name : Codith
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PostSubject: Re: transmission tuning   Mon Oct 27, 2008 9:45 pm

AA wrote:
What year is your car again, Codith?

1997 everything but trans which is from a 98
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BillBoost37
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PostSubject: Re: transmission tuning   Tue Oct 28, 2008 8:34 am

Which tuner are you using?

In the HPT trans shift pressures are found under the (from my feeble memory) transmission parameters. In there you should find shift times, shift pressures and shift speeds.
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