just curious on when you should upgrade the stock fuel pressure regulator, i am looking for 400-500whp with walbro 255, aem fuel rail, RC 750's. what regulator is recomended (aem, aeromotive) or is stock okay?

 

no stock is not ok, not by any means. Either regulator mentioned will do just fine. Aeromotive is a great FPR.

 

is this the aeromotive to get?

http://www.spoolinperformance.com/ae...tor-p-425.html

 

sure looks good to me

 

nothing wrong with B&M regulators...i like B&M because the regulator modifies the stock one...looks very clean...here's mine.

 

has anyone had this problem. i have a b&m regulator and i cant turn the fuel pressure down from 56psi. the car has been tuned but the #4 plug keeps getting black. nothing is internally wrong wit the engine. is this due to such high rail pressure. air fuels are 14.7 idle, 13.5 cruising and 11.8 in boost. only #4 is black.

 

This is where you explain why.

 

Ive had problems with B&M on some cars i tuned. Fuel pressure didn't seem to consistently rise at a 1:1 ratio...Swapped stock back on and car ran great.

Stock is perfectly fine untill your dealing with big pumps and huge injectors..

 

I've ran stock fpr little over 400whp, no problem. I think once you step up to dual pumps or aeromotive pump you will need a better fpr.

 

so for the goals that I stated (400whp pump 500whp race tuned by joe @ locash) the oem fuel pressure reg is satisfactory? I was going to upgrade to a -6an feed line, will that be ok? thanks

 

i always assumed stock was fine for a walbro pump or basic setup, once you get into sumps/dual pumps you will need a better one

 

I would say stock is fine. Unless you want the bling. People argue that you need an aftermarket FPR to lower your base pressure back down if you run a walbro pump, but I don't see why. Your base pressure might be a few psi higher, but you should be able to adjust for that with your tuning software.

I'm using a walbro 255 hp pump and a stock fpr. The base pressure did raise a few psi iirc, but nothing that couldn't be fixed on the software side in 5 mins. Also, you never hear about stock regulators failing... yet we've all heard horror stories about aftermarket regulators tearing diaphragms.

 

OEM is fine to 500whp

 

looks like OEM is good for my goals, thanks guys

 

the b and m command flow is ok, i stress the ok, if you can get it to seal.

chances are why your fp is so high is that it has a vac leak, and not sealing, acting like the fac line is off.

your fp will be higher vac line off.

stock is good to 400+- OR when the stock reg cant tame the fuel pump.

 

To clear up some confusion here, the OEM Honda regulator isn't really rated by HP...lol

When do you want to upgrade your fuel regulator (or stock with B&M)?

1. Big fuel pump and elevated static pressures (can't lower base pressure)

2. Custom dual feed rail, for folks running larger injectors with dual feed setup. You don't want a stock regulator being at one side, so you are pretty much forced to run an aftermarket regulator

3. High boost levels. You won't have problems with a B&M/OEM unit if you are running 7-10 PSI. Well, depending on turbo, motor, cams, head, etc.. you can literally be making 180 WHP to 400 WHP @ 10 PSI, correct? You will want an aftermarket regulator to handle rising rate at high boost levels. The B&M/OEM has a weak diaphragm and could leak, wear out prematurely and have unstable fuel pressure when subjected to high boost (18+ PSI for example).