Automatic Transmission 2-Speed thru 10-Speed GM Autos | Converters | Shift Kits
Sponsored by:
Sponsored by:

What are you base pressures at?

Thread Tools
 
Search this Thread
 
Old Oct 13, 2005 | 01:21 AM
  #1  
BrianC98Z28's Avatar
Thread Starter
10 Second Club
20 Year Member
iTrader: (11)
 
Joined: Aug 2005
Posts: 954
Likes: 0
From: Texarkana,TX
Default What are you base pressures at?

I noticed mine today were at 90 under the "Peformance" Column in efi live. Is this stock? My friend gave me his tune with different shift tables and his is at 96. Is this good/bad or what? Should I just leave them alone? And yes Ive read the line pressure sticky at the top. Thanks

Brian
Reply
Old Oct 13, 2005 | 03:57 PM
  #2  
jimmyblue's Avatar
Moderator
iTrader: (11)
 
Joined: Mar 2002
Posts: 12,604
Likes: 7
From: East Central Florida
Default

The "Performance" table on F-bodies is only a cruel
hoax. Though I gather EFILive has some deal where
you can add a wire to the PCM connector and a
custom OS will make all kind of magic stuff possible.

Anyway, this is not a pressure, it's a commanded
percentage of the mechanical-regulated line (which
you have no control of from the console). More can
be had. 100% is all you get. Usually people stay back
at 95% or so.

The Force Motor Current table changes this commanded
line % to a force motor current, and you can transform
that current to a rough idea of actual line using the info
in the HPTuners 'board A4 Tuning section stickies if you
have the need.

Basically if it don't slip, you don't need more line pressure.
Look at your shift events for signs of slip, by input and
output shaft speed logging and Excel plotting of the ratio.
If it grabs and settles in a couple of frames, you're OK.
If it takes too long you probably want to change the
params. It's more efficient to run as little as you need.
Reply




All times are GMT -5. The time now is 05:00 PM.

story-0
6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

Don't get dad new socks or a grill brush this year.

By Brett Foote | 2026-06-09 14:55:56


VIEW MORE
story-1
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-2
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-3
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-4
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-5
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-6
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-7
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-8
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-9
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE