Sufficient fuel system for 500rwhp?

[93silverbullet]

Now I'll wait here for someone to post up that stock injectors are fine because their cousin's uncle's son used them in his 1200 HP Camaro. 

For the last time... it wasn't a Camaro! It was a 9 second Supra! 

[mattster03]

If the green tops are rated 42@40 psi then they will flow 50.5@58 psi.  I echo the sentiments that you should improve your fuel pump situation, but the injectors are plenty for now.  You have headroom on your already generous 80% duty cycle.

HOWEVER

BSFC is calculated using flywheel horsepower.  You basically need to support 580-600 horsepower.

(600*.6)/(8*. = 56.25

No dice.  However 600@ 90% duty cycle is 50 lb/hr.  You would be pretty much right there.  With a supercharged car it would not be something I would want to worry about.

Green tops really should be fine UP TO 500 HP.    Go much beyond that and you lose the "20% safety margin".   

For 100 bucks, I'd buy them just resell, that's a steal.

Now I'll wait here for someone to post up that stock injectors are fine because their cousin's uncle's son used them in his 1200 HP Camaro. 

My cousin's uncle's son's car didn't even use injectors.  He just put like 8 walbros on the intake manifold.  It made 1200hp on low boost without a tune!

Wow, thanks for the heads up on that... I guess I'm shifting back towards looking into finding a good set of 60lb/hr injectors.

[theantirotor]

i'll take the greentops. 

[HTh3r0]

i got my fms greens for 100. Haha. Anyway. . At 400ish i still have alot of injector left. I'm using a supra pump that has been reworked or some crap. I could use a super and a pad for all that flow. Just my .0000002.

[digitalsolo]

Exactly how much power do you have and what are you injector duty cycles?

[mattster03]

Another question: do you have to account for the boost pressure in the cylinder working against the fuel system pressure? For example, if my fuel system is at 58psi and I am running 8 lbs of boost, can I really only account for 50psi fuel pressure?

[Sabre002]

Another question: do you have to account for the boost pressure in the cylinder working against the fuel system pressure? For example, if my fuel system is at 58psi and I am running 8 lbs of boost, can I really only account for 50psi fuel pressure?

thats where the vacumm line to the FPR comes into play.  I would assume you need to account for that pressure. 

[Jordan Innovations]

Another question: do you have to account for the boost pressure in the cylinder working against the fuel system pressure? For example, if my fuel system is at 58psi and I am running 8 lbs of boost, can I really only account for 50psi fuel pressure?

thats where the vacumm line to the FPR comes into play.  I would assume you need to account for that pressure.

Exactly, that's what a boost-referencing (1:1) FPR does.  Should already be taken care of by your FPR.

[mattster03]

correct me if i'm wrong, but i believe i'll need an aftermarket FPR then?  considering I believe my corvette FPR doesn't have a vacuum reference port? holy ish this is starting to cost more than i expected  . good thing i'm laying it all out first instead of buying parts 

[Pez]

Stock Vette FPR won't support 500hp.  I doubt the stock Mazda fuel lines will support 500hp.  Yes, the lines that run all the way back AND into your fuel tank.  O, and when you loose your FPR, you also loose your filter, so you'll need a new filter..... one that can support 500hp.

Expect $500 on a cheep fuel system.

[mattster03]

Well I am all ready running -AN lines, but it's kinda cheating b/c it's only -AN to the FPR which is near the diff... it's mazda to the tank after that.  $500 would be a dream... i'm suddenly staring $800.00 in the eyes!

60lb injectors: $350
Bosch 044: $200
FPR: $150
Lines, fittings, etc: $100

Of course I could probably sell my corvette FPR and Supra pump for $150 to make up a few dollars... but still!

[Pez]

nm, I wasn't including injectors in my price.  I was talking about lines, pump(s), fittings, fpr, filter, rail, etc. And $100 in lines/fittings is cheep.

[Sabre002]

Matt I got like 700 in my fuel system for the 402.  its not cheap when you want to make power.

[BeasTT]

I have well over a grand in mine, but the peace of mind is priceless.

[RX7what]

I put aside more like 150-200 for the lines and fittings. I have over $140 worth of fittings and lines in my engine bay alone.

By the way summit makes some nice house brand AN fittings you can get in black. They are also a little cheaper than the earls stuff.  I have a bunch of part numbers if you want them.