Hey,

Just about done on all my installs but before putting it all back together wanted to double check on if I needed to put in a Fuel Pressure Regulator (FPR)?

List of mods:

Walbro 255
Greddy 720 sec.
Ported Wastgate
Apexi AVC-R (Going for around 10-12 psi)
New fuel filter
3" Turbo back Motoria Exhaust
Rtek 1.7 ECU
Removed Split Air Valve , ACV and Sub Zero Assist

Also if needed what has seemed to be the best one to go with?

I did search but didn't find what I needed.

Thanks,
Mike

 

your setup isn't aggressive enough to need an aftermarket FPR in my opinion. once you start breaking 350RWHP is where you should think about adding one.

 

That would work for me.

I am not going for agressive right now. Probably later on in the future but since this is my daily driver I am just looking for some extra power. Not looking to lay down great times at the track.

Mike

 

Hey,

I have a local guy selling this FPR for $30. Just curious if it is something worth getting at the price and adding it into my system?



sorry large pic but I didn't take it nor am I at a pc to resize it.

thanks,
Mike

 

For 10 bucks you can build a temp fuel pressure tester...

If your stock one is being overwhelmed you will note the fuel pressure rising above 40 psi i believe.

James

 

Hmm that's an interesting rule of thumb...

 

I wouldnt say rule of thumb...what ever stockish pressure was.

Am I wrong? When the FPR starts getting overwhelmed it won't hold the pressure...the pressure will just start rising?

James

 

wouldn't the pressure fall? if the FPR can't handle the pressure and become ocverwhelmed, the fuel should free flow resulting in lower pressure. Isn't that why aftermarket FPR are much larger? handle more pressure without failing?

 

If the FPR isn't big enough, fuel pressure will rise. It works very similar to a turbo wastegate. A wastegate bypasses exhaust around the turbine instead of through it. If it can't byass enough exhaust, turbine speed (and hence boost) goes up. An FPR bypasses fuel back to the tank instead of out the injectors. If it can't bypass enough fuel, pressure goes up and injector flow goes up.

 

that isn't a FPR its an FMU. It will raise the fuel pressure based on boost pressure at a set ratio. It'll make you run waaay too rich if you dont have some way to compensate for it ( safc or equivalent).