big 16g 2gmaf 560cc?

[MellowVR4]

can any body tell me if putting a 2gmaf on my vr4 and 560cc injectors, will i have to tune with an afc, or will it tune its self cause of the maf. im not sure some people say you dont have too, but some other people say u do. just a little confused.

 

You will need to tune it a little. It will be close but not ideal.

Get a keydiver chip and then even an safc on top to get closer for a great budget tune.

 

Quoting MellowVR4:
will it tune its self cause of the maf.


Our ECU's can do very little tuning on their own. There are 3 fueltrims, which are only for rather low airflow in closedloop, not WOT. You are probably going to be very rich at idle, but the fueltrims will help that, eventually.
The biggest problem with that combination though is that the 2G MAS removes almost 30% of the airflow signal to the ECU, so the ECU is using maps that are way too aggressive for the boost you are running. When you are boosting 15psi, the ECU thinks you are only at 5-6 psi, so it uses too much timing advance, which causes knock issues.

 

+1000 for the above I have your set up with 680's and went with a STG 3 chip..

 

[slobra]

I have a 2g MAF, 560cc's and a keydiver chip. Runs like butter. Your thank yourself for buying the chip.

 

[MellowVR4]

yea thats proly the routh im goin wit. thnx /ubbthreads/images/graemlins/grin.gif