new motor today and need help with fuel?
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Joined: Oct 2002
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From: F.H,Waterford,Port Huron, MI
new motor today and need help with fuel? Well it is time to upgrade. So I am building the motor. Crower billet steal rods,JE flat top pistons with gas releave -2.cfm, custom cam,heads 76cfm cnc,still a 348ci,9:3.1,arp studs. So what fuel system do the big power FI car run? I only want to go with 50lb injectors and a fuel pump that is not so loud that it is bothersome! Any thing more I should do when I am in there or even change. I would rather do it once the right way!! I am at 513hp and 594torque now so I am looking to get 600hp on turbos only and still spray(keeping the boost at 10psi) spray at 100hp? 
Re: new motor today and need help with fuel? since you want it to be quiet, id go with a dual walbro 340 intake set up should be street freindly too, with a CAS vacuum/boost regulator, big lines and custom fuel rails.
what cam are you going with?
what cam are you going with?
Thread Starter
TECH Fanatic
Joined: Oct 2002
Posts: 1,648
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From: F.H,Waterford,Port Huron, MI
Re: new motor today and need help with fuel? I don't know a hair smaller than harlan. Greg had it custom grided to his specs! Heads and pistions are going to be here by the end of the week! looking for 650hp and 700
+hp! what do you mean new lines two 340 intank but change lines (rubber). What about ractronics dual intank?
+hp! what do you mean new lines two 340 intank but change lines (rubber). What about ractronics dual intank?
Re: new motor today and need help with fuel? ya the racetronix dual pump is basically the same thing, just plug and play.
I ment you should get new, bigger fuel lines from the tank, as the stock ones wont do that well for the 650-700hp your attempting.
you still keeping this an auto-X car?
I ment you should get new, bigger fuel lines from the tank, as the stock ones wont do that well for the 650-700hp your attempting.
you still keeping this an auto-X car?
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Joined: Nov 2001
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From: Raleigh, NC
Re: new motor today and need help with fuel? So far, even without upgraded lines and wiring, putting dual Walbro 340's in has helped me get more fuel. I activate the 2nd pump with a Hobbs switch to relay.
Here are a few pics:
https://ls1tech.com/threads/showflat...31&fpart=1
Here are a few pics:
https://ls1tech.com/threads/showflat...31&fpart=1
Re: new motor today and need help with fuel?
I only want to go with 50lb injectors and a fuel pump that is not so loud that it is bothersome!
50's should get you to 600RWHP, you'll need to go to a wet shot if you plan to spray it. You'll be on the edge of the MAF range by that point on boost. Dual 340's in the tank would work well.
I would convert to a full returning system, regulator near the rail. You get too much pressure lag with a dead head into the rail like the stock setup. The stock feed line is equivelent to a -6 line, i say use it as the return and add a -8 feed to an referenced regulator.
