10-12lbs of boost fuel system upgrade?
10-12lbs of boost fuel system upgrade? Right now i have 42lb svo greentop injectors and a 255walbro intank pump. is this going to be enough to fuel my blower for 10-12psi?
if not what is needed to change...
Do i need a aftermarket FPR?
if not what is needed to change...
Do i need a aftermarket FPR?
42's may need changing to 60's, but I'd start with these (but I'd have the 60's on hand). I'll let others handle the pump question, but generally put in a bigger fuel system than I think I will need to give me some headroom.
I would run a boost-referenced FPR up near your rails, but there are others that swear differently.
Jim
I would run a boost-referenced FPR up near your rails, but there are others that swear differently.
Jim
I was running 24 gph of meth and with a single racetronics intank and stock lines ECT, I ran out of fuel at the dyno running 12 LBS. I was running the cam and heads in my sig but I just went with a complete nasty fuel system and 60s.
My cam is smaller then yours. (Hotcam) you weren't running a FPR? what is the reason for needing a aftermarket one? any power gains by having the fuel pressure setup through a aftermarket FPR? i have heard of some guys running stock lines,FPR and a upgraded pump/injectors pushing 500rwhp. i don't know what there cam size was or how much boost they were pushing.
I was not running a fpr at the first dyno session, but I kept going lean way early, and fuel pressure was falling too much, before this my car was at 612rw and 519tq and had gone 10,000 miles without one. I dont know why it went lean then, except that I changed from a maf tune to a sd??? or how much gain I got from it because I also added a fmic, I quess this could of added a lb of boost extra tipping the scales past my max. I called Bob at Epp and others and they all said the same thing that Nate did, so I bought his system. They said I needed a fpr with a return and a different pump setup, and that a bap would not do, so I did not want to waste the chance to do it all for future reference, while I was at it. Didn't want to have a system that I had to sell when I upped the boost later. I think it would of been stupid of me to cut corners at that point. Im just relating my experiences so you can weigh it all up.
Last edited by BOONE; Feb 7, 2008 at 05:01 AM.
Simply said you need atleast a boost reference reg after thea rails and at those power levels some 60# injectors for sure. With that much boost and power I think its a ticking time bomb, you won't have close to the right fuel distribution, etc. The stock fuel system with a s/c kit is designed and will handle base boost settings but over that and you are asking for it IMO. You cna get away with using your stock feed line and your evap as a return with a FPR after the rails, bigger injectors and dual intank pumps. Will take you a long way. I'd say around 750rwhp while you are at it get some nice looking bigger rails, they're cheap. Not really needed in your situation but why not. The fuel system is not something to skimp out on. Allot cheaper than a new motor, especially if its already built!
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i'm buying a boost referenced Aeromotive FPR,selling my 42lb injectors for some 60lbs. where can i find a picture of exactly where to mount the FPR? is it taking the place of where my stock LT1 FPR is? thanks- i'm looking to make 500rwhp not to worried about making anymore then that. made 400rwhp-387rwtq with 42lb,255pump failing at 5500rpm and plugs getting washed out. that was around 6-7psi with stock internals. so i should have no problem getting to 500rwhp with a FMIC.
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With a ractronic pnp,97vette rails with brfpr and 60lbs injectors i was out of fuel at 4200rpms. I would go from 75psi at full boost to about 38psi after the motor sucked down all the fuel. I was making about 480hp at 4200rpm through an unlocked converter,mustang dyno,9inch. Im upgrading to the lonnies dual intank.
not trying to argue your guys points but i talked to a member over at camaroblank.com and i have talked to him over the past couple years about stuff as well. he had his 95z28 pushing 700rwhp on stock lines and stock FPR. that was with a procharger. he said the stock FPR on the LT1 is vaccum/boost referenced.
I think the idea is to spec your system so you have some 'insurance' or headroom. What if you were running stock maxed out and something happened to make it go off by a measly 10%? Then you're hosed and moaning about bad advice. Build your fuel system for 25-30% more power than you ever want, filter it well and be done with it. Next problem.
Jim
Jim
. so when i get money i will upgrade the rest. 
My old setup was procharger pushing 9lbs boost on stock motor. I had the racetronix fuel pump and svo 42lb injectors. At idle it would hold 61psi fuel on the guage, WOT would knock it down to the upper 40's at the lowest point I saw.
New setup and not running yet is forged 383 with 60lb injectors and should be in the 10-12 lbs of boost range. I installed lonnies twin pumps and upgraded fuel rails. Not sure what the fuel pressure will be like but I'm hoping not a problem.
New setup and not running yet is forged 383 with 60lb injectors and should be in the 10-12 lbs of boost range. I installed lonnies twin pumps and upgraded fuel rails. Not sure what the fuel pressure will be like but I'm hoping not a problem.
Yeah my goal is 500rwhp so if 10 psi gets me there thats where i will stay. but i just bought a FPR and will get the rest down the line as my build is nowhere near being done. thanks
