PE Multiplier too small?
Thread Starter
Joined: Nov 2001
Posts: 3,066
Likes: 0
From: Sunny San Diego
PE Multiplier too small? After installing my headers, and lowering my IFR to get my LTFT's negative. I am pretty sure I am running rich on PE. So I take it too the track and watch my KR.
I lowered my PE vs RPM 2% at a time to around 14 % and still no KR. My PE table is .87xx is that too low??
I lowered my PE vs RPM 2% at a time to around 14 % and still no KR. My PE table is .87xx is that too low??
TECH Addict
Joined: Jul 2002
Posts: 2,261
Likes: 0
Originally Posted by Ed LS1 Vert
After installing my headers, and lowering my IFR to get my LTFT's negative. I am pretty sure I am running rich on PE. So I take it too the track and watch my KR.
I lowered my PE vs RPM 2% at a time to around 14 % and still no KR. My PE table is .87xx is that too low??
I lowered my PE vs RPM 2% at a time to around 14 % and still no KR. My PE table is .87xx is that too low??
Seems kind of dangerous to me to lean it out based on recorded knock.....but I'm No Guru. FWIW.
joel
TECH Addict
Joined: Jul 2002
Posts: 2,261
Likes: 0
Originally Posted by Ed LS1 Vert
The whole run. 4000-6500
Any idea how much to scale down the PE Table for 1 point?
Any idea how much to scale down the PE Table for 1 point?
joel
Trending Topics
TECH Addict
Joined: Jul 2002
Posts: 2,261
Likes: 0
PE is WOT, Open Loop. No learning .
Did you rescale your IFR? Did you multiply by 108 % the PE values that resulted in the 14.1 AFR??
.08 is a reasonable value for dropping the AFR, by about one point, in the 15:1 to 12:1 range. It will raise or drop it by .9 - 1.2 points.
-> 0.08 = 8 %.
If you want to lower the AFR multiply the denominator by 108%. For example -> 14.7/1.2050 <-PE RPM value = 12.20 too low so we want to increase. Remember PE value is the Denominator.
1.00-.08= .92 -> *100=92%
1.2050 * .92 = 1.109 <- new PE value
14.7/1.109 = 13.26,.... not perfect- but gets us in the ballpark.
Does this help????
Did you rescale your IFR? Did you multiply by 108 % the PE values that resulted in the 14.1 AFR??
.08 is a reasonable value for dropping the AFR, by about one point, in the 15:1 to 12:1 range. It will raise or drop it by .9 - 1.2 points.
-> 0.08 = 8 %.
If you want to lower the AFR multiply the denominator by 108%. For example -> 14.7/1.2050 <-PE RPM value = 12.20 too low so we want to increase. Remember PE value is the Denominator.
1.00-.08= .92 -> *100=92%
1.2050 * .92 = 1.109 <- new PE value
14.7/1.109 = 13.26,.... not perfect- but gets us in the ballpark.
Does this help????
Last edited by binksz06; Nov 23, 2003 at 01:20 AM.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
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 Thread Starter
Joined: Nov 2001
Posts: 3,066
Likes: 0
From: Sunny San Diego
Ok, no learning needed.
Yes, I did scale down my IFR and multiplied the PE table by 108% to get to 13.8
But doesn't changing the IFR screw up the calculations?
Did turning off COT or installing the headers cause the leaness?
Thanks.
Yes, I did scale down my IFR and multiplied the PE table by 108% to get to 13.8
But doesn't changing the IFR screw up the calculations?
Did turning off COT or installing the headers cause the leaness?
Thanks.
