i was told on a fox the low 500 hp range

 

Some say low 400s... but I was running short with my 255 lph pump and had to go to twin 255 SVT pumps. I'm at 409 rwhp and using 42 lb injectors.

 

how do you get 2 pumps in the tank and how much money is a set up like that.

 

How much HP are you running? I'm using a vortech booster pump with mine and ran out of fuel around 549 rwhp. That is with BBK fuel rails and 42lb injectors. I'm not sure exactly which piece of the fuel system is the bottleneck but I would guess the injectors reached their limit, because fuel pressure never dropped.

We changed the pulley and I'm making 531rwhp now with no fuel problems.

 

Some of this is going to greatly vary depending on the combo used to produce those numbers. Running a N/A setup will obviously require far less fuel as you are only aiming for an ~ 12.5:1 AFR at full load/wot. A turbo setup would be next, and will typically run out of fuel in the low-mid 500rwhp range with a HP255 pump, stock lines/rails and an ~ 11.5:1 AFR. Superchargers because of their extra parasitic drag are typically run out of steam a bit earlier and are typically good for 450-500rwhp with ~ 11.5:1 AFR’s.

With that said, if you have a $h^% tune and are running around with a 10:1 AFR…you’re going to run out of fuel quicker. Does that mean you need bigger lines and rails? Hell no it doesn’t, it just means you need a proper tune!

I myself am right around 500rwhp with a single gss340, stock lines and rails and an even 11.5:1 AFR across the board.

 

I run a 255 with no issues. Mine makes 600 crank

Tim

 

Its not just a function of horsepower, but also on how you are making the power. If you are boosted, your fuel delivery will require increased pressure as well.

Increasing pressure decreases delivered volume.

If you drop your fuel pressure (as I am by using large injectors), naturally aspirated, I suspect you'll get well over 500hp. Less pressure = more volume delivered.

Share more on how you plan to make your power and you'll get better responses. If you look hard you might find a fuel volume vs. pressure curve for your pump, that will tell you 'volumes' (pun intended) on what you would like to do.

Good luck

 

All excellent points as well....we need more info.

 

I made it to 488 with no problems with a single 255 and 60# injectors. 550's should be no problem with an in tank and a secondary inline.

 

Depends on if it's a power adder combo or N/A.

 

Thanks, you just reinforced what I just wrote in far far fewer words. I might be able to 'one up you' though....

"It Depends" is the shortest answer I think, unless you want to drop the "It".

 

"it"

 

Good question. I'm N/A with stock injectors/rails and make around 425rwhp. I was just wondering where the limit would be the other day...

 

ok heres the combo now. stock motor with trick flow stage 1 cam edelbrock performer rpm, 24# injectors. powerdyne supercharger 6# bigger throttle body. fmu, and a sniper wet nitrous kit. msd box with btm. bbk shorties 2.5 ehhaust. the nitrous kit only goes to 125 hp. we are going to put a set of ported 351windsor heads that are milled .050 that I have used before and worked well. it should be in the 400+ rwhp range. is the 255 pump gonna work for this ?

 

You shouldn't have any trouble, IMHO.