sti 360

iTrader: (1)

hello
have just bought a walbro 255 fuel pump cos mine is died,i have a v2 sti with a de-cat middle and a back box also a k&n fitted so the big question is do i need a fuel regulator

thanks
matt

STI Craig

no u dont mate
the standard one is very good, and is often used on cars up to about 340bhp

sti 360

iTrader: (1)

cheers mate im glad of that,im sure the fuel pump was not at its best for awhile cos the car was hesitating on boost,will the better ,more powerfull fuel pump improve performance?

thanks
matt

Jay m A

iTrader: (2)

I believe the Newage ones are better than the classics, there has been some speculation on the walbro 255 overpowering the OE regs, so your car might run a bit richer if it does. Richer AFR's on boost will reduce performance (like for like)

STI Craig

if the old one is a little tired then maybe but other than that no because the fule reg should be doing its job
but often people that i know who have fitted them have said that it improved response more than anything.

also with your mods i dont think youll need to worrie about a rich mixture if anything it will be a little safer

sti 360

iTrader: (1)

if its going to run rich then it should be safer to put my mbc on, when i get enought courage and knowledge on how to put it on