I have a comptech fmu laying around as well so I will see if that helps maybe. Only thing is it will cause pre vtec wot to be super rich I would think since it raises fuel pressure everywhere not just vtec wot.

 

Yeah nothing wrong, this is what happens. Its always leaner in the morning too, but after about 20-30min of driving around and getting things nice and warm you will see your afr settle down another .5 or so. I see aprox one full point from 11:5 to 12:5 from summer to winter temps on the same tune. Crank down that fpr to compensate.

 

Thats right. vafc time. You should have one anyway if you arent planning on an EMS

Or try out one of those new SOS or CT FVM piggy back devices, there is no adjustability like a vafc but it would likely be a benefit for you at your boost level and circumstance.

 

Ryan, with all those shift knobs you are selling you should be able to grab some type of better engine management

 

Yeah I definitely notice that. Let it warm up to 3 bars and then drive definitely runs a good bit leaner for the first bit then is good to go. Even when hot outside.

 

My AFR readings stay at around 11.1 (WOT) or so at high (90+) or low temps (< 55). CTSC w/ AC w/ 7lb pulley.

 

[QUOTE=00S2K01S4,Oct 14 2010, 01:56 PM] My AFR readings stay at around 11.1 (WOT) or so at high (90+) or low temps (< 55).

 

it raises fuel pressure based on boost so if your prevtec but only making 1psi of boost, then it raises fuel pressure at the rate it does based on 1psi. and as boost increases it will continue to raise fuel pressure even more.

 

But when you adjust the comptech fmu it richens up everywhere not just in boost. So makes it super rich wot before vtec! I had it in for a little while before and vtec was good but pre vtec was pig rich and bogging down.

 

This is true in theory, but with the Comptech fpr it doesn't work that way exactly. There is in fact an inherent problem with an overly rich condition pre vtec to get the proper afr up top. Why they set up the fuel curve this way I don't know. As your boost pressure or breathing efficiency goes up it continues to exaggerate this. The simple solution before any of these new SOS/CT-Engineering correction boxes started being introduced into the base kits.... was to run a vafc and lean out the pre vtec fueling and the side benefit was of course you can lower vtec to gain mid power significantly. I can attest to the vafc/CT set up successfully/reliably for several years myself.