PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Stoich Setting??

Old Mar 28, 2005 | 11:33 PM
  #1  
soundengineer's Avatar
Thread Starter
8 Second Club
20 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (16)
 
Joined: Jul 2003
Posts: 4,651
Likes: 17
From: Chicago IL
Default Stoich Setting??

I noticed in hptuners you can set the Stoich Ratio #......
would there be any use or reason for being able to change it???
would changing it have any benefits??
like say of you changed stooich to a richer # like 13.5 or something like that???
I have no plans to do so.... mostly just curious
Reply
Old Mar 29, 2005 | 12:23 AM
  #2  
txhorns281's Avatar
TECH Fanatic
iTrader: (12)
 
Joined: Jan 2004
Posts: 1,869
Likes: 0
From: Houston, TX
Default

You would change it when using a different type of fuel (other than pump gas). But for most of us, chaniging it wouldn't be a very good idea since the PCM tries to achieve stoich AFR when in closed loop. Try getting your 02s read 13.5 accurately, then talk to me!
Reply
Old Mar 29, 2005 | 08:33 AM
  #3  
12secSS's Avatar
TECH Junkie
iTrader: (30)
 
Joined: Nov 2001
Posts: 3,690
Likes: 1
Default

For a strictly race car only, that is in SD Open Loop, yes. Otherwise no! Your MPG will drop drastically under cruise conditions.
Reply
Old Mar 29, 2005 | 09:23 AM
  #4  
jimmyblue's Avatar
Moderator
iTrader: (11)
 
Joined: Mar 2002
Posts: 12,604
Likes: 7
From: East Central Florida
Default

If you were being fed a steady diet of oxygenated fuel,
alcohol etc. you would want to put the true chemical
stoichiometric value there. Closed loop will come back
around to whatever makes the O2s swing balanced but
open loop uses that as part of the fuel shot calculation
without any such correction.
Reply


Thread Tools
Search this Thread

All times are GMT -5. The time now is 04:28 PM.

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