255lph pump

[luckythirteen13]

will a 255lph in tank pump support a sc motor making 425rwhp+ with 42# injectors? i have the 255 now and have the t-rex but was wondering if i really need it. how exactly does having two pumps on the same fuel line work exactly?

 

[dwhiskie]

Thats all I have, no T-rex and no problems

 

[vristang]

Here are some recommendations that I worked out according to formulas I found in Four Stroke Performance Tuning by A. Graham Bell. Running at 80% of plump capacity helps ensure a long life from the pump.



_____________________80% of Max______80% of Max



Ford EFI Options_______N/A Limit________Boost Limit

110 lph________________240 hp__________200 hp

155 lph________________340 hp__________280 hp

190 lph________________420 hp__________340 hp

255 lph________________560 hp__________460 hp



I recommend considering future plans when deciding on a fuel pump.

You should be ok. With more power though you will most likely need the secondary pump.

jason

 

[luckythirteen13]

looks like im probably going to be needing the second pump. are those numbers crank or rear wheel hp? i know i wont hit 460rwhp but ill pass 460 at the crank for sure

 

[Dbeck002]

I think your main problem is the injectors. 24 lbs are too small for 400 RWHP. pump should supply enough fuel for a car running 10s, injectors are just small.

 

[Ozz]

I think your main problem is the injectors. 24 lbs are too small for 400 RWHP. pump should supply enough fuel for a car running 10s, injectors are just small.

He said 42#.

a 255 pump should be fine, but a T-Rex would not be overkill either. From what I hear, it draws when required.

 

[vristang]

looks like im probably going to be needing the second pump. are those numbers crank or rear wheel hp? i know i wont hit 460rwhp but ill pass 460 at the crank for sure

Those are for crank hp, I believe. I will double check when I get home tonight.

 

[luckythirteen13]

dan is refering to they 24# injectors i have now. they handled with an fmu up to 350rwhp but they were going lean. that was also below 4500rpm. all the dyno runs were cut at 4500rpm cause my fuel system just couldnt hack it