some one told me that it would be possible to raise the fuel pressure of a standard regulator by squashing it in a vice. is this true or not? thanks

 

Not sure. I think the chances of it splitting and if not noticed spraying nice flamable fuel over the engine highly likely. Might not be a good idea???

 

you might up the pressure but you would also restrict the amount getting through

 

what part of the regulator do you think they meant squash? the body of it or the part where the hose goes on?

 

Ive read this in a Haynes Engine Management book. The flow is not restricted. It is the same theory as replacing the spring for one with more tension that simply ups the pressure. What pressure this is going to be is anyones guess.

 

how does the regulator actually work? could some explain, what does the vacume do on it? thanks

 

The valve has a spring that allows the feul to run back to the tank when a predertermined pressure is reached, say 3bar. The vacuum further opens this valve when idling etc so as to lower pressure.

 

thanks mate, i understand now.

 

does anyone know how reliable they are at keeping a good pressure when running more power. im going to be running about 1.3 bar boost thanks

 

What power are you after and what injectors/ fuel pump do you want to run.
You may find that upping the pressure isn't needed.

Nick

 

The line goes to the inlet manifold to control the pressure an whatever boost you're at.

If you're at 1.3 bar the fuel press is raised by 1.3 bar ie to 4.8 bar.

Squashing it is not a good idea I'd say they're weak enough already. And yes, it will restrict flow. Restricting flow is how it controls pressure in the first place!

Dave

 

True on a Subaru, I forgot about it raising pressure under boost.

As for flow restriction, it should still flow the same amount, just at a higher pressure.

 

FPR is on the outlet of the fuel rail and is just a regulating valve. by shutting off the valve and hence reducing the flow to the tank return, the pressure rises.

 

its a my 00 so its got 440 injecters, ive got walbro pump,uprated turbo with supporting mods to get around 330bhp, its also got a parallel fuel rail mod using the standard regulater. do you think it will be ok?

 

thanks

 

Get a decent uprated FPR such as an SX.

 

if its definatly needed i will have to get one, im just skint at the mo and my remap is on the 24th. is any one else using a standard reg with this sort of power? thanks

 

Being skint and aiming for those sort of figures may not be the best idea.

Things can break when your running over 100bhp more than when it left the factory.

Speak to your mapper if you need confirmation about the FPR.

 

yeah i know what your saying mate,its just a bad month. my car is all done now tho exept the regulator. thanks

 

It won't last long, but it will last a bit. Change it next month, if you keep the fuel press the same it won't be a problem to put a new one on then.

 

Hey?

 

Hello?

Is my grammar that bad that that is unreadable..... quite possible!

Anyway just to add, it may also last the life of the car but I doubt it

 

I use the std reg on my MY00 at 333bhp. Works just fine on Walbro. I have an SX but no time to fit it yet.

F

 

My reg sat under my bed for months until the old one failed and I had to fit it, they go with quite a shocking pop!

 

RB5: Wasn't/isn't quite clear whether you're suggesting he run a 'squashed' FPR or run the std one until next month - hopefully the latter

I would rather postpone the mapping until everything is in place as you (presumably) wouldn't be able to realise the benefits of increasing the FP if mapped with OE FPR.

Floyd: Are you still on 440s?

 

I was suggesting the latter

he has 440's, which will be bine for 330bhp on stock fuel pressure