PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

ultra sensitive VE's?

Thread Tools
 
Search this Thread
 
Old Jul 6, 2006 | 09:17 AM
  #1  
Greg Fell's Avatar
Thread Starter
TECH Fanatic
20 Year Member
iTrader: (9)
 
Joined: Feb 2002
Posts: 1,126
Likes: 0
From: Morton IL
Default ultra sensitive VE's?

To get my VE's dialed in....I have to increment the values fractionally. IE say a cell is 16:1 afr, and the VE value is 40. I have to make it 40.3 to make it 14.0.

Why is my car so dang touchy? This will make it pretty durned hard to tune. Also, FWIW, the few cells I do have dialed in fairly well, are way different than other bins i've seen. i looked at a stocker, and a buds heads/g5x3 VE tables and they are way higher. Also, my bud seemed to think my wideband values seemed to bounce around quite a bit.

When I ordered my injectors (lucas 42.5s) from speed inc, i had them sent directly to ARE when they did my motor. I'm wondering know if I even have 42.5's in it, maybe they put 60's in or something? It would not surprise me at all...that clown-show really did a number on my motor, they have/had no clue whats in the motor (or even how to put one together correctly). I redid it recently and hardly anything was what they told me it was supposed to be.
Reply
Old Jul 6, 2006 | 09:32 AM
  #2  
12secSS's Avatar
TECH Junkie
iTrader: (30)
 
Joined: Nov 2001
Posts: 3,690
Likes: 1
Default

You know you can increase the resolution of the VE table to display from 40.3 to 40.39765 (for example). That is how I fine tune vehicles.
Reply
Old Jul 6, 2006 | 09:39 AM
  #3  
Greg Fell's Avatar
Thread Starter
TECH Fanatic
20 Year Member
iTrader: (9)
 
Joined: Feb 2002
Posts: 1,126
Likes: 0
From: Morton IL
Default

Yes, of course. I just was fairly surprised that it was that finicky. From what I gather, most aren't.
Reply
Old Jul 6, 2006 | 10:32 AM
  #4  
jimmyblue's Avatar
Moderator
iTrader: (11)
 
Joined: Mar 2002
Posts: 12,604
Likes: 7
From: East Central Florida
Default

Be sure that you aren't chasing something around
the tree, like a poorly performing WBO2, an air leak
or air pump running, etc.

Though in some cases there can be positive feedback
in mixture, especially in open loop running off a high
enrichment point in the table vs MAP (more fuel
further depresses vacuum / raises MAP, leading to
even more fuel) this should not be the case in the
area of EQ=1.000 commanded.

I suspect an offset / sampling / unmetered air sort
of error, more than a 0.8% airflow tweak making a
9% AFR actual change. Watching your injector
pulse width (higher resolution) might be interesting,
did it move 9% (AFR indicated) or did it move 1%
(VE modified)?
Reply
Old Jul 6, 2006 | 10:48 AM
  #5  
Greg Fell's Avatar
Thread Starter
TECH Fanatic
20 Year Member
iTrader: (9)
 
Joined: Feb 2002
Posts: 1,126
Likes: 0
From: Morton IL
Default

This is an OLSD tune. All air is unmetered. I'm fairly certain I dont have anything in regards to a poorly performing WBO2 (new), an air leak (unmetered), or air pump running (doesn't have), etc.
Reply
Old Jul 7, 2006 | 11:40 AM
  #6  
Greg Fell's Avatar
Thread Starter
TECH Fanatic
20 Year Member
iTrader: (9)
 
Joined: Feb 2002
Posts: 1,126
Likes: 0
From: Morton IL
Default

Has anyone else experienced this? Makes using the RTT features very hard. I can't just increment/decrement a cell with the + - button. Have to change it by hand.
Reply
Old Jul 7, 2006 | 12:03 PM
  #7  
ringram's Avatar
TECH Fanatic
20 Year Member
Liked
 
Joined: Aug 2005
Posts: 1,691
Likes: 1
From: Sunny London, UK
Default

Normally its not that sensitive. Definately check the basics.
Reply
Old Jul 7, 2006 | 12:32 PM
  #8  
ZL1Killa's Avatar
TECH Resident
iTrader: (17)
 
Joined: Sep 2004
Posts: 3,747
Likes: 0
From: NC - Charlotte area
Default

when i was fiddling with my 60# motron injectors mine was VERY sensitive....thats another story, gotta finish that in august.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

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

 Verdad Gallardo
story-1

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

 Pouria Savadkouei
story-2

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

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

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

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo




All times are GMT -5. The time now is 04:49 PM.

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