Hua said:Larry @ SP did 645RWHP with dual feeds and a center return modified stock rail. The stock injectors were at like 95% or 99% duty cycle though.
The OEM rail has an ID equal to many aftermarket designs...it is not the limiting factor, Injector size is...put in some bigger injectors and convert it to dual feed from each end and a center outlet and you are good to go...They have bigger side feed injectors available...lilmatty96 said:i thought u could run bigger side fed injectors and get more power
KevinB6876 said:What I meant was stock rail stock injectors stock MAF stock ECU stock pump. Max RELIABLE power? I'm not talking 90-100% duty cycle here guys. 75% duty cycle.
yea, anything can happen to an old car. maybe something wrong with his fuel system.onequiksupra said:Well said YaosAuto.
My friend's 94 with a sp57 on stock fuel was running out of fuel (safely tuned) at 15 PSI which equated to 450 RWHP. Small mods can be done to get more fuel but a total upgrade just seems safer to me.
On the topic of the boost a pump unit, we use them ALOT here at work. They are really an awsome unit. Kenne Bell makes a "Boost-a-pump" and so does MSD. We have used both on pretty much every car. Most of the higher HP cars we run twin walboros and have one on a boost a pump which uses a hobbs swtich to activate the boosting of it. The boost a pump at full tilt puts out 18.5v i think when activated, the booster is essientially a DC to DC converter taking 13.5v to 18.5v @ 15 to 30amps.IGGYWOOWOO said:I would like to take this discussion one step further. we know that the stock injectors will handle ~550 RWHP. The stock pump varies greatly at different voltages.
injectors supported at these voltages would be:
11 V: up to 360 cc/min 15 V: up to 690 cc/min
12 V: up to 450 cc/min 16 V: up to 750 cc/min
13 V: up to 550 cc/min 17 V: up to 800 cc/min
14 V: up to 625 cc/min 18 V: up to 875 cc/min
that being said... what if you were to use an MSD fuel pump booster which adjusts the fuel pump voltage by boost pressure PN# 2350
I know that the viper crowd along with other rings have had great success with this unit.
The real question here is if this setup were to work... what HP would the stock fuel lines support. I am not talking typical overbuilt fuel systems here. But real world #s. If I were to get 750 cc injectors and try this system, would I really need dual feeds on the stock rail? I know that I would also need a fuel pressure regulator.