Thread: afr and rrfpr questions
07-03-2012, 02:01 PM #1
afr and rrfpr questions
So i have an x charger #42 injectors 4" front air intake and i am adding an ext intercooler and rrfpr along with an afr gauge. the questions are can someone give me an idea for base pressure to start with? what am i looking at for an afr reading to be good. high means lean and low means rich correct? the fpr has a locknut and a allen head is clockwise richer or leaner? finally you check base pressure with engine off put dess key on correct?
07-03-2012, 02:25 PM #2
07-03-2012, 03:49 PM #3
So from searching I think I am going to start at 60 PSI base pressure. What am I looking for in an AFR reading? What should I see and when. I assume I am more concerned about WOT or 3/4 etc?
07-03-2012, 03:52 PM #4
I believe a good start psi is 58-60.
And a good AFR to shoot for is 12( maybe a little leaner at idle)
07-03-2012, 04:40 PM #5
since you can only control fuel pressure you will want to make sure you are around 11.8-12 at WOT. All other engine speed you will have to live with. They are what they are.
The only way to tune the AFR at other or all engine speeds is with an additional device, Rude controller, BEGI or Dynojet CMD. A Vtech tune is another option. I run a CMD with Autotune and it works flawlessly.
I get 14.5 idle, 13.5 mid and 11.8 WOT. My fuel economy is awesome. My buddy used 1/2 tank on his stock RXT yesterday, i used 2 bars
07-03-2012, 08:00 PM #6
Thanks guys I am hoping to get it together for tomorrow, but its fighting me the whole way.
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