Thread: Another RRFPR question...
02-16-2010, 11:34 PM #1
Another RRFPR question...
I have a 4-tec with stock internals. Running all stock except for air intake, greenwheel, and external intercooler, and billet fuel rail.
What is the advantage of running an RRFPR over 40 lb injectors?
Either one better or worse? Why?
Any input would really be appreciated.
02-16-2010, 11:35 PM #2
02-16-2010, 11:47 PM #3
I don't see an advantage until you add more boost. You should be running OEM injectors on the Greenwheel.
If you upgrade supercharger, then you will require larger fuel requirements.
I think you are good as you are.
02-16-2010, 11:53 PM #4
I will also be running an external IC.
From what I have heard, you need to move up to 42# if you are running greenwheel and external IC... is that not true?
02-17-2010, 12:11 AM #5
My ski started its life as a 185 hp (without an intercooler). When I added the XS kit, I didn't upgrade injectors. I didn't upgrade injectors until I added the X supercharger.
02-17-2010, 01:14 AM #6
if you have a 127mm upgraded wheel (ex. greenwheel) and external IC you need 42s.
02-17-2010, 05:14 AM #7
with the greenwheel and external cooler you need #42 injectors -- i had that with a 3 " air intake for over a year and it worked fine with nothing else --- but with stock injectors you will be running a bit lean
02-17-2010, 08:38 AM #8
so, no advantage of rrfpr over 42# injectors?
02-17-2010, 08:41 AM #9
No very little...42s would be the simplest, and way i would go with this setup..
02-17-2010, 08:50 AM #10
- Join Date
- Dec 2006
- Crest Hill, IL
Remember, the RRFPR allows you to dump more fuel when needed, not a fixed flow all the time. If you went to a fixed injector size and no RRFPR, the you will be rich down low and maybe lean up top, depending on boost and temps...Makes smaller injectors act BIGGER when needed, then back to normal when not.
With your setup, use the stock injectors on that rail and you are safe up to an Riva S3 SC. If you can get an A/F reading, you can adjust your RRFPR pressure according...Then if you go to a bigger SC, just swap to larger injectors, drop the pressure a little and start over reading A/F...
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