Just adding a fuel pressure regulator without spending quality time on a dyno or at LEAST tuning your piggyback or standalone with a wideband oxygen sensor, is quite possibly a waste of money. Why do you think your car needs this?


FYI, seriously not trying to be rude here:

Defiantly: Not what you meant, spelled wrong 2 ways. Twice. 02.gif
http://dictionary.reference.com/browse/defiantly

Definitely
http://dictionary.reference.com/browse/definitely

 

Most regulators (including stock) are already 1:1.
Rising rate usually refers to regulators with larger ratios (2:1, 5:1). You are running 5 psi on stock fuel system? Then yeah getting a rising rate will help a bit but as you realize it is not a solution.

 

Also Tdonnel on here is running like 15 psi and i last time i know, he is still on stock regulator even though he is running larger fuel pump, which is because he is standalone fuel computer

also i think Jay-M member up in Canada is running stock regulator with Dual Rail and SMT 6...

everything comes down to tuning

 

^ how can you be running stock regulator and dual rail? (stock regulator mounts on one rail, you would need a regulator with two "inputs" or an additional regulator for the other rail).

Stock regulator is good with 190lph pump, needs to be replaced with bigger 255lph pump. Obviously he wouldn't need a rising rate if he had a standalone or piggyback (although with a rising rate you might be able to get away with a bit smaller injectors).

But he is looking for a rising-rate (bigger than 1:1) to get a more fuel under boost than with stock FPR. A real rising rate FPR will be more expensive.

Keep in mind that on a 1:1, while the _absolute_ fuel pressure is rising with boost, the _relative_ pressure difference between the fuel and the intake charge is constant, so similar amounts of fuel are dispersed independent of boost (think of boost as "pushing against" the fuel, a 1:1 exactly compensates for that).

So if you get a (say) 3:1, you will be flowing whatever 3-1=2 extra "effective" psi of fuel per psi of boost comes out to. (i.e. at 5psi, that's 10 extra "effective" fuel psi, ~20% more than stock). In any case, it's not safe to ever be running too high of a fuel pressure (probably ok up to 60-70psi, which for 5 psi of boost means you can use a rate of at most 4:1 on the FPR before you go over 65psi).

 

That was quite a bit to take in, but I think I understand. I dont think I have seen a rising rate regulator with more then a 1:1 ratio. Ive seen regular fprs, fmus with higher ratios, but I dont think they were rising rate.

Yes, Ive been running 5 psi on a pretty much stock fuel system for about a year now. The only thing I have is a walbro 255 lph fuel pump.

 

i think this is what your looking for:

http://cgi.ebay.com/ebaymotors/Vortech-6Z1...=item5d28015258


if your running stock injector i recomend a 12:1 ratio, the good thing is that once you get the FMU itself you can buy the different ratio diaphragms (eg 10:1,8:1,6:1 etc.) according to your fuel needs and how much boost your putting in the engine, i also recomend getting a quality 1:1 FPR to go along with the Vortech

 

If it ain't broke . . .

 

I never thought about running an fmu and a fpr together. I does make sense though. I did have plans on upping the boost to around 8-10 psi after installing a fpr. It really just depends on how things feel though.

 

I asked Denisst99 about this and he said its possible...if second rail is only actived for Boost via Turbo box/Smt6...why is there a need to regulate fuel if you not on Boost...granted with this setup you could only run 190 fuel pump, cuz anything higher you need aftermarket FPR

also PaT CournoyeR is running is dual rail like this...

http://www.rdtiburon.com/index.php?showtopic=26392&hl=

 

you need a 1:1 to use an FMU, remember the FMU works on boost, but you need the 1:1 for when your running on vacuum, which is most of the time, you can't just straight up run an FMU by itself