SD Tune risky in A4

Reply Subscribe

Thread Tools

Search this Thread

Dec 30, 2005 | 08:01 AM

Lady Redhawk

Thread Starter

TECH Addict

iTrader: (6)

Joined: Dec 2001

Posts: 2,028

Likes: 0

From: sojourning....looking for my city whose builder and maker is God.

SD Tune risky in A4

If there is no answer to this: https://ls1tech.com/forums/pcm-diagnostics-tuning/426348-full-line-pressure-a4-sd-tune.html and line pressure is being effect uncontrollabley, we need to rethink SD tune in A4!

Dec 30, 2005 | 08:19 AM

Brains

TECH Senior Member

iTrader: (7)

Joined: Jan 2002

Posts: 12,754

Likes: 0

From: Katy, TX

Its more a problem with the 98's I believe. I haven't had this issue with the 99+ cars at all.

Dec 30, 2005 | 08:52 AM

Lady Redhawk

Thread Starter

TECH Addict

iTrader: (6)

Joined: Dec 2001

Posts: 2,028

Likes: 0

From: sojourning....looking for my city whose builder and maker is God.

I've had this problem in my 2001 F-body A4 and in a 01 C5.

Dec 30, 2005 | 09:31 AM

jmm98LS1

10 Second Club

iTrader: (28)

Joined: Feb 2005

Posts: 3,975

Likes: 3

From: KS

If you're using HPTuners, email them your .bin file and they will fix it. I just did it yesterday and the problem is fixed. Don't know what they do, but it works. If you're using something other than HPT, dunno what the answer is.

Dec 30, 2005 | 09:34 AM

foff667

LS1TECH Sponsor

iTrader: (2)

Joined: Jul 2003

Posts: 7,986

Likes: 3

From: Clermont, FL

Quote:

Originally Posted by Lady Redhawk

I've had this problem in my 2001 F-body A4 and in a 01 C5.

hmmm i was told this is only in 98-00 code...wonder why this happend to those cars :shrug:

Dec 30, 2005 | 11:09 AM

Lady Redhawk

Thread Starter

TECH Addict

iTrader: (6)

Joined: Dec 2001

Posts: 2,028

Likes: 0

From: sojourning....looking for my city whose builder and maker is God.

Quote:

Originally Posted by foff667

hmmm i was told this is only in 98-00 code...wonder why this happend to those cars :shrug:

The Vettes are really a different issue than the f-bodies. They go into a reduced power mode that would also lock them into 3rd gear, but that can be tuned out. It's the line pressure issue that is disturbing. Among other perimeters and calculations the pcm uses to determined line pressure at any given area, it also uses torque and load calculations that comes partly from the MAF.

If the line pressure has already been turned up mechanically (turned screw 1/4 turn or so...) and/or tuning, Need to keep close watch on the line pressure in SD mode.

Dec 30, 2005 | 11:46 AM

chrisj6

TECH Enthusiast

Joined: Dec 2005

Posts: 512

Likes: 0

From: Conway, AR

I havent had any issues with this in my 99 truck, although I have an 01 pcm and OS.

Chris

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Verdad Gallardo

6 Common C5 Corvette Failures and What's Involved In Repairing Them

Pouria Savadkouei

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Verdad Gallardo

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Pouria Savadkouei

Top 10 Most Powerful Chevy Trucks Ever Made!

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Verdad Gallardo

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Verdad Gallardo

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Verdad Gallardo

10 Camaros You Should Never Buy

10 LS Engine Myths That Refuse to Die

Verdad Gallardo

Dec 31, 2005 | 01:07 PM

Runn

TECH Fanatic

Joined: Aug 2003

Posts: 1,130

Likes: 1

From: Tranås, Sweden

Quote:

Originally Posted by Lady Redhawk

If there is no answer to this: https://ls1tech.com/forums/showthread.php?t=426348 and line pressure is being effect uncontrollabley, we need to rethink SD tune in A4!

I have this problem on my car and now i have tuned in my VE is there any way to calibrate the MAF after the new VE... But will the new MAF values change the PCM load calculations?