bradsky77

is it the s4's version of a super afc minus the "a" (air) part. ?
does it just adjust the duty cycle of fuel injectors. the reason i'm wondering is i think i may run rich at this altitude (5280) with the awe fuel kit. so, i was just thinking ahead about the possibilities of a 5 bar fpr

Blitzkrieg

More pressure = more fuel for the injectors. 1bar= 14.7 psi so 5 bar =73.5psi

zapco98

regulator, which under load, delivers ~72.5psi to the fuel rail. In essence, what happens is with a higher FPR, you get more fuel delivery out of an injector (to a certain point.) For instance, going up from a 4bar, to a 5bar in essence is equivilent to increasing your injector size approximately 10%. ie. 350cc to ~380-385cc. It will not help richness issues by "increasing" fuel pressure, infact it will increase richness. If you're running too rich, I would contact AWE/GIAC - maybe there is a reason, or maybe you have O2 sensor problems...

bradsky77

why don't super afc's work in our cars?

frank

because a chip does a better job than a AFC, even a Supra AFC

bradsky77

it just seems tougher to remap a chip vs. an afc (super or supra) ?

Blitzkrieg

I though it was AFC or V-AFC for VTEC controller as well as Air Fuel Controller

zapco98

the only way I've been able to tell that the ecu has compensated is reduced injection time, from say 23ms to maybe, 20-21ms instead. I really don't know *how* or what it does when it adjusts with an FPR, I do know the motronic system has 20% fuel trim adjustment (10% above and below the programmed trim) but aside from that, I really don't know.

bradsky77

so the FPR adjusts itself within that 20% window that you're talking about?

frank

it's part of your ECU, you can mistune an AFC as easy as a chip

and "Supra" is my way of saying using an AFC, on a Bosch ME7 system is RICE