Pakisho

I was told this in one of the regional forums. You can change the vtec engagement point, but cannot add/remove fuel?

Is this true? What about the S-afc? I think Im getting my alphabets mixed up here......

KAMcDonald

vafc works fine.

keith

jondoe2131

you cannot add fuel with the vafc if you have a supercharger. You can lean out the mixture with the vafc. This is due to the way the vafc work. With the supercharger on the car, the MAP sensor is seeing positve pressure. If the ecu sees a positive pressure from the map sensor it goes into a limp mode. To prevent this, the SC guys install a box to "cap" the signal from the map to the ecu at atmaspheric pressure. The VAFC adds fuel by increasing the MAP sensor signal to the ecu (more air in needs more fuel). However if the VAFC increases this signal above the cap, the ecu goes into limp mode.
-Jon

Pakisho

Ahhhh, got it.

So, you up the fuel pressure across the board with the FPR, and then lean it out using the V-afc to restore/make more power.

Am I correct?

Is this a viable permanent solution, though?

kitwetzler

You can, but you'll have to get a different RRFPR, the comptech one doesn't have much adjustment.

But, the thing to do would be to get an AEM EMS if you want to make real power. That, with some larger injectors would be pretty good. If you don't want to spend that much, larger injectors with a greddy emanage would be pretty decent too, the AFC is just not a good enough tuning tool, and it's real easy to screw up the obd-2 load calculations if you aren't careful.