i have a built block, but i put on my turbo kit after breaking in my motor. so i went to my shop to put on an inline fuel pump. they told me to go with the intank walboro 255lph pump. so i did... running stock injectors and a 12:1 FMU disk.

now i drove the car hit about 5 lbs of boost and my autometer A/F guage went into the red. im wondering why am i running lean..according to the guage??

should i have just kept the FMU??

 

You need to run an inline fuel pump with the high rise rate FMU. The regular Walbro 255lph intank can't supply the needed fuel at high fuel pressures.

 

I tough just running the 255lph intank pump would supply enough fuel to support this... would the inline fuel pump still be needed if i use 450 DSM injectors instead of my stock? sorry to jump on you question tony


[Modified by LJR-LUDE01, 7:39 PM 12/28/2002]

 

well dam, i just wasted my money then, i shouldve waited for the intank and just got the inline installed...

 

Actually you should have just gone standalone... Otherwise why did you build it?

 

standalone is comming at the end of january, when i get more moeny....i just wanted to run a nice little 6-7psi..thats all

 

yeah in that case you did waste your money....
If you were to get a pump the one you should have gotten was the 255lph high pressure intank fuel pump.Walbro/holley makes one.
Now that you have the high flow pup it will work great for when you get the stand alone and larger injectors...

 

From what Arturbo told me a long time ago when I was just doing a basic DRAG setup on my GSR, 12:1 FMU, Inline pump, STOCK in-tank pump. And no more than 6-7psi.

Another thing he told me was K.I.S.S (Keep It Simple Stupid)

But regardless of a stock motor or built, I wouldn't put a turbo kit on my car until I had a standalone. Ask anyone on this board and I think most would agree.