Thread: Fuel Pressure w/ RRFPR
04-15-2010, 11:51 AM #1
Fuel Pressure w/ RRFPR
Got my new fuel rail installed last week -thanks Danny.
Put in fuel filters at pump, new Walbro pump and
newly cleaned injectors
Located the Rude (turbosmart) RRFPR and gauge to
where i can read it with seat off while riding/testing
SO after put new stuff in, I had to turn my Regualtor down
to 60 psi (key on, engine off). IT was at 65
So I guess between the rail, pump, etc I gained a few psi.
Now to my question/concern.
Set at 60 psi (per instructions), It drops down to about
56 psi or so at idle (vacuum signal)....
Under WOT at max rpms, I am seeing about 62 psi.
I have S3 charger, so I thought I'd see about 10 psi difference
between idle (vacuum signal) and WOT (boost signal).
Anyone have any thoughts or comments on this???
04-15-2010, 12:12 PM #2
04-15-2010, 12:35 PM #3
04-15-2010, 01:31 PM #4
Perfectly normal with the turbosmart regulator... they do not rise anywhere near 1:1. When I ran that regulator with the stock fuel pump... my fuel pressure at WOT was 3 psi lower than the base pressure setting . With the walbro pump... my WOT pressure was never more than 3 psi above my base pressure. Thats all your going to get out of it.
04-15-2010, 03:54 PM #5
- Join Date
- May 2005
Where is your regulator mounted, before the fuel rail or after the rail in the return line from the rail to the tank?
04-15-2010, 04:20 PM #6
If its Dannys Fuel rail its mounted after the rail...
04-15-2010, 04:52 PM #7
- Join Date
- Dec 2006
- Crest Hill, IL
Where are you referencing your boost line? You should be referencing it at the IC blockoff if you can. If you are using one of the ports on the intake runners, then it will not rise properly...
Also, try to get an A/F reading during a run, you should be able to see if that RRFPR is functioning properly when boost kicks in.
If you are running an S3, then OEM injectors will work fine. When my Turbosmart was working (before I changed it) my base pressure was about 56 in the summer, close to 60 in the winter...
04-15-2010, 05:17 PM #8
04-15-2010, 05:29 PM #9
04-15-2010, 05:44 PM #10
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