We put a 12:1 fmu on my friends turbo dohc ZC crx yesterday. It is using stock crx Si injectors. Hooked up my wideband and at partial throttle it is below 10:1 a/f as it climbs to 6.5psi it leans out some and settles at a great 12.4-12.7 a/f. anything we can do to clean it up down low without a vafc or safc?

 

um...I know this easy said than done...but a standalone would fix that...but off hand my guess would be to bring down the fuel pressure a bit

 

thats what i thought too. but if remove some pressure, it will remove it across the board, leaning out the top end, and the top end is great.

 

try it and see...if it doesn't work, just try to find a happy medium, but I **think** your FMU should compensate for the lower pressure...not sure though

 

umm well if u had a SAFC, i would say at Low and HI throttle set it at -50% for 1000 2000 rpm's....