WOT AFR vs RPM

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Jul 26, 2001 | 06:49 PM

Aaron91RS

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From: St. Louis

Car: RS

Engine: LS1

Transmission: T56

Axle/Gears: 9" for the ladies

WOT AFR vs RPM

Thats the title of one of my tables. I thought the AFR should be 14.7:1 at low RPM's and then drop to 12:1 at higher RPM's under WOT. My stock lo5 table says the below.
Am I to interpert it as 12.4:1 and so on or are these numbers a function of something else. If it is a 12.4:1 at 400RPMS shouldn't it be higher?

RPM | AFR
-----------
400 | 12.4
1200 | 11.1
2000 | 11.8
3200 | 10.6
4800 | 12.0

Jul 26, 2001 | 08:07 PM

Brent

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From: PA

The AFR should not be 14.7:1 during high load situations (WOT) no matter what the RPM is.

If you lower those table values to 14.7 you might detonate to pieces during WOT.

The numbers in the table are the commanded AFR at WOT.

Jul 26, 2001 | 08:43 PM

Grumpy

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From: In reality

Car: An Ol Buick

Engine: Vsick

Transmission: Janis Tranny Yank Converter

Quote:

<font face="Verdana, Arial" size="2">Originally posted by Aaron91RS:
Thats the title of one of my tables. I thought the AFR should be 14.7:1 at low RPM's and then drop to 12:1 at higher RPM's under WOT. My stock lo5 table says the below.
Am I to interpert it as 12.4:1 and so on or are these numbers a function of something else. If it is a 12.4:1 at 400RPMS shouldn't it be higher?

RPM | AFR
-----------
400 | 12.4
1200 | 11.1
2000 | 11.8
3200 | 10.6
4800 | 12.0</font>

14.7:1 is strickly for emissions, and had little to do with what an engine actuals wants or likes. BTW, it's a average AFR.

You tune to what an engine tells you it wants. Never to what YOU think it wants.

Reading thru some of the past postings here will explain things in better detail.