biscuit

D16y8
Eagle Rods
Vitara Std. Pistons
T3/T4 50 trim
Arp's
450cc Injectors
P28 on Crome

I was wondering if the stock fuel pump on my 97ex would be sufficient for 300whp... I searched and couldn't find an answer. Any help would be great.

biscuit

Anybody?

lock-pop!

dont risk it. Cheap insurance. they are only 100

Scott-EP

Buck ten shipped from me

i have heard of 300whp on stock pumps though. i have never done it though.

88dx

ive seen 300hp on stock pumps but just get a walbro or one of those 255lph from xenocron

Tom-Guy

Upgrade stock pump wiring as the factory wiring doesn't have enough ***, you'll start leaning (abruptly) at 375 Dynojet/325 Mustang.

0b00st0

Lower the base fuel pressure to 30psi or so and do what JD said and it'll actually support quite a bit of power. The only bad thing is that you'll need really large injectors to support the power it'll max out at since you'll have only 30psi of pressure across the injector.

Pumps flow incredible amounts at lower pressures, it's just the nature of it.


It's all about flow per injector at pressure, flow required at peak horsepower, and fuel pump flow at base fuel pressure + boost pressure. You have to juggle these values to get stuff work at their maximum.


Generally though it's way easier (and cheaper) to put the fuel pump on overkill.

Tom-Guy

My experience is with stock pressure @ 16-17 psi so the pressure differential across the pump (not accounting for tank pressure, big ? really) was 57-58 psi. IIRC stock, and non-HP Walbro, flow tend to die off at those pressures. You probably could get more by dropping pressure but with 1000's I ASSume idle quality due to fuel atomisation would deteriorate - they are right at the borderline of good idling characteristics already.

Anyway, for the average person, you have to upgrade the pump wiring to get anything to work correctly in the first place - I've seen a couple Walbro setups lean out at 450 whp due to stock wiring and insufficient pump ground path (unibody = fail), and they are 600-700 whp pumps. If you are limited by 450cc injectors, and a stock block, it really doesn't make sense to upgrade fuel pumps *or* spend extra money on a FPR (which has no place on a sub-700 whp Honda, and is of lesser quality than OEM) in order to spend extra time ------- around to make the car run. Maxxie, your idea has a use in a certain time and place, but it's not a commonplace one. :P

0b00st0

It's not commonplace, cause most people are tards when it comes to simple things.

The thing is, that you can get away with quite a bit of power with a FPR, HP pump, and 450's. And generally a FPR and DSM's are cheaper than mainstream injectors. This of course would not be with a stock block.


Also, 16psi base pressure and 57psi so that's probably 35+ with minimal tank-rail drop. I wanna see this crazy car running on a stock pump? Only you JD.

Tom-Guy

I didn't lie to you last time we argued. This time is even easier to verify.

Jason Goforth built Stevo's 92 H22 hatch, it's currently sitting in his shop. Want his shop number? It's been on Aaron Lail's MD-1100SE at TruDynoSports in Conover, and Eric's 248C in Asheville (Eric now works for Appalachian Performance). Further, lotsa the local celebrities had a hand in on it; you come to WNC and say Wes Buckner and ricer bitches give you ********, slow ****** Z06 C6 with nitrous start making excuses why they can't race. Hell, you can talk to Stevo himself about the car.

All of them will tell you what's in it, and that I'm too ------- lazy to pick up a 10mm wrench to unbolt an ECU myself much less swap a fuel pump.