SpeedJunkee

I tried posting this in the fueling section, but never really got any answers (or those that I did conflicted with each other).

I'm looking to make 1,000(ish) RWHP in my turbo LT1 Camaro.

The setup;

Fully forged 383 LT1
84mm S400 turbo
115# injectors
93 octane, plus meth injection and a FMIC

I currently have dual in tank Walbro 255lph pumps (HOBBS switch and relay for pump #2).

Lonnie's says this is good for 1,000 RWHP, but I am more skeptical and think this may be more at the limit and want some extra room.

I was thinking more along the lines of dual 340lph pumps running them the same as my 255lph pumps.

Has anyone ran dual 340lph pumps in their f-body?

Anyone know the limit RWHP wise on dual 255lph and/or 340 lph pumps? It would seem to me this would depend on the fuel pressure being used, and I know mine will be a little less standard here being in an LT1.

JoeNova

255s will make 1000 if there aren't any line restrictions and you keep your base pressure low. 340s should be able to do it under normal circumstances, even with an average 58 psi base pressure.

SpeedJunkee

I am running -6 line. I'm not sure what my fuel pressure will need to be for my setup. That will be up to the tuner.

Would this be okay? Or would I need larger lines?

Orr89rocz

iTrader: (13)

I ran lonnies dual 255's. -8 feed -6 return. 40 psi base pressure, 24 psi boost. Pump power is off alternator for more voltage. Straight 93 oct. Made 1009 thru th400 and 12 bolt

Keep total fuel pressure down they will make power. See the flow charts, they drop off fast with more pressure over 65 psi

SpeedJunkee

I just have no idea what fuel pressure I'll be at with the tuning. I can say normal pressure out of boost should certainly be in the low 40's, but in boost, I have no idea.

I think I probably will be between 20-24#'s of boost at max on the high end. I am just concerned with running out of fuel and don't like being on the edge of "should be fine".

SM105K

iTrader: (3)

I am about to stuff dual 450's in my car....

SpeedJunkee

Let me know how it goes. I considered that first as I really like the turbine style of those fuel pumps, but it looked from the large bottom design of them, that they would not fit as a dual setup in the tank of an F-body.

jmm98LS1

iTrader: (28)

I've got dual 450's in my 98 steel tank. Far from an easy fit but they'll go in with some creativity.

Orr89rocz

iTrader: (13)

You keeping an m6? Then duals 255 will do over 1100

20psiofevil

How will you prevent slosh? I did something similar but used 255's and custom made a sump for the 255's to ride in.

JoeNova

With those injectors, you can run a fairly low base pressure. Tell your tuner to start at 45 PSI. If your duty cycle gets too high, turn the pressure up ~3 PSI and try again. If your duty cycle is still OK but you're running out of fuel, turn the base pressure down ~3 PSI. Adjust as needed. You should be able to fine tune even 255s this way to make 1000 HP.

SpeedJunkee

Well hearing from a few more that my 255lph pumps will safely do 1,000 at the tire makes me feel better.

Orr89rocz

iTrader: (13)

I now run triple 255's and dont have any sloshin problems. I keep it around 1/4 tank but have been down to an 1/8 and never had an issue with open bucket like that

jmm98LS1

iTrader: (28)

The 98 steel tank has internal baffling to keep the pump submerged. My two 450s sit in the same spot the factory pump did so should be good.