Fuel Pressure reg for boost

[TurboAlero]

Hi people does any one know where I can get a FPR at a good price ?
That is for boost aplications.
For a 3.4 v6 LA1 engine

[sharkey]

just use a stock regulator, it will work fine with boost.

[TurboAlero]

Mmm well there's people saying that it's recommened to change it , because they say it will not work good under boost.

[treeZ24]

did they give any reason for that?

[TurboAlero]

That I know , Nops.But I'm talking to blackjack and he told me that the stock one will work fine till a range of 8-10psi.I'm going higher more than that so he recommended me to change it.

[AaronGTR]

just use a stock regulator, it will work fine with boost.

No, it won't. It doesn't raise pressure at a true 1:1 ratio under boost and the diaphram isn't designed to handle that much pressure. It will fail eventually.


Get a caspers unit if you can still find one (they are out of production but some stock left) or get an adjustable cap (the cheapest solution). Not sure which brand works but someone here knows. You cut the top off the stock one and put the cap on and you get a boost friendly regulator thats adjustable. You'll want to be able to adjust the pressure anyway if running over 10psi and the stock one won't let you do that.

[rickykline]

or you can buy a dhp... and tune it the right way..

[loner666]

^what he said..but if thats out of the question you can use a RRFPR..thats what i have currently but getting rid of soon as im swapping to OBD2 so i can tune the thing

[strtrydr]

Turbo ... If your on Aleromod whats your screen name?

and if BlackJack said that then I assume it wouldn't matter even if it was tuned with a DHP PowrTunr.

I can only relay my personal experiences with BlackJack (he lives about 3hrs. from me) since I have seen his work and Tuning experience First-Hand, but I am not saying you guys dont know what your talking about either.

Just my .02

[TurboAlero]

My screen name is Turbo AleroGt40.
Well I have the HP tuner so basicly it does the same as DHP.
He sad that would be ok for low boost (8psi-10)
Till know I don't have any prob with that because I'm running know at 6-7 psi boost with no prob

[Jman]

http://60degreev6.com/store/index.php?act=viewProd&productId=64

Get these and run any aftermarket rrfpr you want.

[AaronGTR]

http://60degreev6.com/store/index.ph...d&productId=64

Get these and run any aftermarket rrfpr you want.

Yeah, there's that too. If I swap to the 3500 top end I might get rid of my caspers unit and get those instead, dunno.


Anway obviously you don't just tune fueling with an AFPR, but a tuner does not replace the need for one. Sometimes you still need to be able to dial down the base pressure to keep your peak pressure down. Also if you're using much larger injectors, there is a limit to how short you can make the pulse so sometimes it helps with getting the fueling better at idle. Having a tuner is good, but an AFPR is still part of a good overall tuning strategy.

[Joseph Upson]

I guess you have to subtract the amount of pressure above 0 psi from your max fuel pressure at max boost to get an rough idea of how much of an increase in pressure you are going to need, equal and opposite forces go nowhere so as you increase your boost pressure you decrease the fuel flow into the intake at least in theory anyway. The regulator will compensate some if it is connected to the manifold.

I have ignored this in the past but intend to increase my base pressure by the amount of boost pressure I intend to run.

[Jman]

Aeromotive also makes a fuel pump controller that is rpm referenced. That may help with idle using huge injectors.

[TurboAlero]

OOh ok cool,hmmm what's tha diff inbetween a fpr and a fmu??
witch is the best to use for a boosted car?