I'm currently running a Walbro 255, and it's been fine for a little over 400, but I've heard that I'll need something bigger for 500. What's a good setup for 500+ ?

 

add a inline bosch 044 pump.

 

Leave the Walbro in there and add the Bosch to it?

 

Bosch under the hood after the filter

should be good for 700ish

 

^^ yup.. Heres a pic of the setup from another thread.

 

How much power exactly? 505 or 595? For the most part, 550whp and below you shouldn't have any issues at all with only the Walbro pump.

 

Probably not much over 500. The blower that I'm using has made 489 in the past, but that was on a Ford 3.8 V6 motor.

 

That walbro should support 500.

 

Do Your calculations people it is common sense…
Stock fuel system with 255 LPH pump is typically good for up to about 600 HP. Plus it all depends on what size injectors you run and other factors....

Since mostly there is not any good info on here just use these formula's I took the time to post below...

INJECTOR SIZE CALCULATION

Injector Size in lbs/hr per Injector = Expected HP X BSFC / Number of Injectors

For BSFC RICH = .60 Race Gas/Mid Range = .50 LEAN = .45

Injector sice in cc/min = [(Injector size in lbs/hr X 454) / 60] / .75


FUEL PUMP SIZE CALCULATION

Total Fuel Flow = Injector Fuel Flow in lb/hr X Number of Injectors

Fuel Flow in Gallons Per Hour = Total Fuel Flow in lb/hr / 6.25

To convert to Liters Per Hour = Fuel Flow in Gallons Per Hour X 3.8 = Fuel Flow in Liters Per Hour


If you can't understand that then you are beyond help, and go back to school for Math, Please...

 

^^ Good info.