E85 & LT4 fuel system?
 

Anybody here know how much hp my flex fuel pump and an LT4 hp pump and injectors would support on E85? Just wanting to maybe increase boost to maybe 12 and run more timing. Not wanting to do a cam or meth really bc it's my work truck. Remember I'm PD.

I have seen 650rwhp. issue is people post numbers but you later find out they have cam or meth. So it is a little had to know straight numbers. I run 12-14psi now at 600rwhp and I'm max of fuel non e85. Stock fuel and cam. The issue you will see in the low side. There are kits available for low side. I have intake,tb,hpfp,injectors,lpfp system, E85 w/ flow rate, and boost ref regulator. going in next. Oh and stall. Man things add up...

So it's kind of looking like 420 ish may be the limit of low side on E85? If that's the case I would need low side as well. I'm wanting to avoid meth for reliability reasons on a DD work truck is the reason. Am I going to have to do the whole fuel system to avoid this? 2Fast4U you're turbo right? Littlefield you have a cam I think?

No sir I was referring to 2Fast's comment of him being 600 and at the limit non E85 so I figured a 30% loss from 93 or 420. That's why I want E85 is for the timing and extra boost :). Just about ready to buy an ealier LS though to mod hence the new thread in projects. Really hate the fuel system limits of the new trucks even though DI does perform no question. Just so much trouble and $$.

No I am turbo 600 is max on stock setup. But cam can buy 30% more or LT4 HPFP and injectors. This is why you see so many people going with Meth, well that and as you said cost. I will be installing injectors high and low pump and a few more things by april. I will not have lt4 parts however. And no meth for me E85 and a fuel setup for over 1000hp not that I will get to that power but still.

I can't say for sure but you are properly right on the power the max I saw a guy run for power on a stock 5.3 turbo with meth was 624rwhp that that was ALL out everything it had on E85 but again the meth really helped out with those numbers. You are fine to low-mid 500 with E85 and LT4 parts in my opinion. I say that number because of the low side it is the weakest link.

Oh and there are MUCH cheaper low side options like intake or external on a boost switch. Even fuel bungs on a 2 stage system. No internal returned fuel pump in tank and y tap the factory line. super easy if you are adding a aftermarket adapter anyways for E85 or even at intake tap.

How are you seeing 600 on a stock fuel system? Must be nice! I know turbo but that shouldn't be but 75 ish difference I'm guessing? And fill me in on low side options please sir. What would you do to have enough for 650-700ish on E85 or am I just limited to 550 or so without spending a fortune lol. External? Just thinking down the road for more cubes. I am going back and forth. I love my truck but these 2014+ are a bitch on fueling! Thanks!