i searched, and found a good post, but they were refering to graphs that are no longer visable. anyways. Myquestion is: From the begining (when i mash foot on gas/WOT) untill peak boost, should i see a steady 11.3 AFR? As i run now, i can see as i build boost, it goes from like 12.5 (begining of WOT)to ~11.5 At peak boost. And i was wondering if i needed to either get rid of that slope and make it 11.5 or w/e during the whole WOT duration. Thankx for the help.

Setup:
Portfuler (yes, yes i know, Mega sqirt FTW....)
8.8:1 CR
Hahn S20g
EGT (1500 WOT)
AEM WB

didnt you used to have a portfueler?

-MIKE-

Stroked 2.2L

lean during spool, fat at full boost (but not too fat).

95 Avenger
ATX->MTX Swap
Holset HX40 @ 26 psi

lol, i still do have the PF, i just know every time a PF is mentiond.. a sales pitch come for the Mega squirt..lol, so i fifugred id get it outa the way...lol..

so as i spool thru the RPM range 13AFR is ok, untill i hit main boost then i need to be ~11.3AFR

Yea that sounds OK. I ususally allow for a bit higher AFR's (read 12-high 12) in the zero to lower boost portion (0~8ish psi) and then slowly lower them as boost increases (up to 20psi). It really depends on the motor too. I mean my car likes it a bit leaner, where as some other engines prefer pig rich. Play with it until you find max power, you will probablly need some dyno time. good luck!

You may also consider water injection and going leaner because of this. While there are power gains with a richer (to a degree) than stoich mix under boost, much of the reason why going rich is suggested is to prevent detonation. As water is far superior to extra fuel in this regard (plus you're not dumping extra fuel - there are a few negatives here), I think it's always the better choice. But that's just my opinion.

2gnt: '99 RS-T, killed by a toyota, pending rebuild...
Daily: Volt
Daily #2: '99 EVG ebike- STOLEN by PEDRO