PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Tuning question.

Thread Tools
 
Search this Thread
 
Old Jul 16, 2005 | 10:06 PM
  #1  
Big Geek's Avatar
Thread Starter
11 Second Club
iTrader: (2)
 
Joined: Dec 2003
Posts: 535
Likes: 0
From: Montgomery, AL.
Default Tuning question.

Heres the scenerio - I installed 3.42 gears, a TCI SSF convertor (tightened up a touch), and 295/50-15's (26.7-in tall). I used my HP Tuners software to recalibrate the gear, tire size and diameter. I also recalibrated the shift points at WOT to 5500/5500/5800 as well as moving the "P/N cutoff" and "Bad Vss Cutoff RPM" to 6700.

Having done all of this the car drives MUCH better at part throttle and all the way up to maybe 8/10ths throttle but when hammered all the way to the floor it still appears that it is getting onto the rev limiter before it shifts. Is there something that I missed? I am beginning to think that I have a bad spark plug as well but I do not see how that could be making it appear as if it is on the rev limiter. Any suggestions? Thanks in advance for any and all help.

Jim C.

PS- I did a search in the forums for various subjects relating to this but didn't really find anything that pertained to my delima here or at the HP site.
Reply
Old Jul 16, 2005 | 10:10 PM
  #2  
P Mack's Avatar
TECH Addict
iTrader: (6)
 
Joined: Jan 2003
Posts: 2,382
Likes: 2
From: Phoenix
Default

I don't know much about automatics but i'll give it a shot. To shift both the shift speed and rpm must be met so make sure your shift speeds aren't too high.
Reply
Old Jul 18, 2005 | 07:18 AM
  #3  
Big Geek's Avatar
Thread Starter
11 Second Club
iTrader: (2)
 
Joined: Dec 2003
Posts: 535
Likes: 0
From: Montgomery, AL.
Default

Thanks, I will take a look at that and make sure to adjust the shift speeds as well. Thank you for your help.

Jim C.
Reply
Old Jul 18, 2005 | 07:30 AM
  #4  
WS6FirebirdTA00's Avatar
TECH Senior Member
20 Year Member
iTrader: (33)
 
Joined: Mar 2003
Posts: 8,319
Likes: 1
From: North Carolina
Default

yeah i havent messed with but one auto, but you have to set the shift speeds lower as well
Reply
Old Jul 19, 2005 | 08:16 AM
  #5  
Big Geek's Avatar
Thread Starter
11 Second Club
iTrader: (2)
 
Joined: Dec 2003
Posts: 535
Likes: 0
From: Montgomery, AL.
Default

Originally Posted by WS6FirebirdTA00
yeah i havent messed with but one auto, but you have to set the shift speeds lower as well
Can one scale this feature or do I need to calculate it myself to match the shift RPM?

Jim C.
Reply
Old Jul 19, 2005 | 08:22 AM
  #6  
WS6FirebirdTA00's Avatar
TECH Senior Member
20 Year Member
iTrader: (33)
 
Joined: Mar 2003
Posts: 8,319
Likes: 1
From: North Carolina
Default

my guess would be to calculate it, there is a site that does this ill have to get it when i get home. fbody.org/gears, something along those lines i think
Reply
Old Jul 19, 2005 | 11:35 AM
  #7  
P Mack's Avatar
TECH Addict
iTrader: (6)
 
Joined: Jan 2003
Posts: 2,382
Likes: 2
From: Phoenix
Default

If you have a log file, just look at the speed you're at right before you hit the rev limiter.
Reply




All times are GMT -5. The time now is 12:25 PM.

story-0
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-1
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-2
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-3
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-4
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-5
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-6
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-7
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-8
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-9
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