PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

HP Tuners help on trans

Thread Tools
 
Search this Thread
 
Old Feb 23, 2014 | 03:42 AM
  #1  
gtfodave's Avatar
Thread Starter
Staging Lane
 
Joined: Nov 2012
Posts: 99
Likes: 0
From: Fort Myers, Florida
Default HP Tuners help on trans

Hello, My gto has a problem on the 2-3 shift where it does not shift at the limiter it bounces the limiter and then shifts

I pulled the tune off my 04 automatic GTO just to see if it was my trans slipping or is my tune was a little off and not a trans issue and noticed that the 2-3 shift was 86 mph. I quite dont see that happening

the car is a factory geared car on a 275/50/15 rear tire. would setting this to about 74mph be a smarter move to eliminate this issue?
Reply
Old Feb 23, 2014 | 05:52 AM
  #2  
MUSTANGBRKR02's Avatar
12 Second Club
iTrader: (91)
 
Joined: Aug 2006
Posts: 4,599
Likes: 5
From: Maine
Default

You could try that or adjusting rpm also. PCM needs to see mph and rpm to shift. Your transmission could be showing its age too and starting to slip some.
Reply
Old Feb 23, 2014 | 06:02 AM
  #3  
gtfodave's Avatar
Thread Starter
Staging Lane
 
Joined: Nov 2012
Posts: 99
Likes: 0
From: Fort Myers, Florida
Default

Originally Posted by MUSTANGBRKR02
You could try that or adjusting rpm also. PCM needs to see mph and rpm to shift. Your transmission could be showing its age too and starting to slip some.
the trans has maybe 2,000 miles on it since being built, hoping it isnt a dead trans yet.

so would I be setting my mph to be closer to my redline or just a mph where i would like it to shift?
Reply
Old Feb 23, 2014 | 10:13 AM
  #4  
RedMilleniumZ28's Avatar
9 Second Club
iTrader: (2)
 
Joined: Feb 2011
Posts: 78
Likes: 0
From: Holland, MI
Default

I had this problem with my camaro when tuning i raised my shift points. and started to get a limiter type feel going from 2-3. after some exploring i found that my fuel cut was too low. under hpt it is "engine; fuel; cutoff, DFCO"; "Fuel Cutoff RPM vs. Gear"
Reply
Old Feb 23, 2014 | 01:58 PM
  #5  
Russ K's Avatar
TECH Resident
20 Year Member
Photogenic
Photoriffic
Liked
iTrader: (1)
 
Joined: Apr 2006
Posts: 811
Likes: 4
From: Regina, Sask
Default

Originally Posted by gtfodave
Hello, My gto has a problem on the 2-3 shift where it does not shift at the limiter it bounces the limiter and then shifts

I pulled the tune off my 04 automatic GTO just to see if it was my trans slipping or is my tune was a little off and not a trans issue and noticed that the 2-3 shift was 86 mph. I quite dont see that happening

the car is a factory geared car on a 275/50/15 rear tire. would setting this to about 74mph be a smarter move to eliminate this issue?
The stock WOT 2-3 is 68 mph, and a 275/50/15 tire is .2" shorter than the OEM tire. At 86 mph, you will be hitting close to 7000 rpm. And the shift mph has to be at least 5 mph lower than the shift rpm.

Can you post your tune? What is your desired shift rpm?

Russ Kemp
Reply
Old Feb 25, 2014 | 02:29 AM
  #6  
gtfodave's Avatar
Thread Starter
Staging Lane
 
Joined: Nov 2012
Posts: 99
Likes: 0
From: Fort Myers, Florida
Default

Originally Posted by RedMilleniumZ28
I had this problem with my camaro when tuning i raised my shift points. and started to get a limiter type feel going from 2-3. after some exploring i found that my fuel cut was too low. under hpt it is "engine; fuel; cutoff, DFCO"; "Fuel Cutoff RPM vs. Gear"
thanks man that does sound like what i may be having, im gonna pull the tune tomorrow!
Reply
Old Feb 25, 2014 | 02:32 AM
  #7  
gtfodave's Avatar
Thread Starter
Staging Lane
 
Joined: Nov 2012
Posts: 99
Likes: 0
From: Fort Myers, Florida
Default

Originally Posted by Russ K
The stock WOT 2-3 is 68 mph, and a 275/50/15 tire is .2" shorter than the OEM tire. At 86 mph, you will be hitting close to 7000 rpm. And the shift mph has to be at least 5 mph lower than the shift rpm.

Can you post your tune? What is your desired shift rpm?

Russ Kemp
desired would be between70-78 if possible I am going to pull the tune tomorrow, thanks for your help
Reply




All times are GMT -5. The time now is 11:09 AM.

story-0
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-1
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-2
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-3
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-4
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-5
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
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE