so whoever knows how the stock fpr works (the ones on the 2.4 specifically), does it close more at higher boost levels, or does it stay at the same pressure regardless of positive boost pressure? so if i push 2 psi or 6, will it still create the same fuel pressure or will it be higher?
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- Sold my beloved J in April 2010 -
mine stays as it was at 0 vacuum
Viper98912 wrote:so whoever knows how the stock fpr works (the ones on the 2.4 specifically), does it close more at higher boost levels, or does it stay at the same pressure regardless of positive boost pressure? so if i push 2 psi or 6, will it still create the same fuel pressure or will it be higher?
it stays at 0 vacum. no boost recognition
I was a retard, and now I'm permanently banned.
Quote:
it stays at 0 vacum. no boost recognition
Are you absolutely sure? No other FPR that GM makes is like this. Almost all port fuel GM FPRs that I have experience with will increase fuel pressure at a rate of 1 psi fuel pressure for 1 psi boost. In order for it to keep a constant pressure, there would need to be a bypass device built in to release pressure. I'm looking at Delphi's (GM's) information and pictures of this regulator and I don't see anything which indicates there's a bypass. But it's not a RRFPR. If you add 6 psi boost you'd be looking at about 61 psi fuel pressure (55 base plus 6 ).
hth
-->Slow
^^^^^I'd go with what he said. I guess it is possible for it to be as open as it could possibly be at 0.... if that were the case then it would sit still at any boost pressure.
I don't know if this is so... just a thought.
Cardomain|
Myspace
my fuel pressure gauge is right under my boost gauge , the pressure rises the closer i get to 0 vacuum , and from there ive never seen it go higher
Interesting. I wonder if the pump has a pressure limit? GM pumps generally top out between 80 and 95 psi. Aftermarkets can be all over the place.
Oh, well. I guess ya go with the guys that have the gauges.
-->Slow
I have no input on this........ other then MOST aftermarket regulators are 1:1 boost compinsating......
SPD RCR Z -
'02 Z24 420whp
SLO GOAT -
'04 GTO 305whp
W41 BOI -
'78 Buick Opel Isuzu W41 Swap
SpeedRacerZ wrote:I have no input on this........ other then MOST aftermarket regulators are 1:1 boost compinsating......
But it's GM we're talking about here.
I was a retard, and now I'm permanently banned.
Viper98912 wrote:so whoever knows how the stock fpr works (the ones on the 2.4 specifically), does it close more at higher boost levels, or does it stay at the same pressure regardless of positive boost pressure? so if i push 2 psi or 6, will it still create the same fuel pressure or will it be higher?
It is a diaphram (sp?) inside, vacum moves it. With the GM charge it is the map sensor reading boost.
FU Tuning
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- Sold my beloved J in April 2010 -
