bern11

iTrader: (13)

Just wondered whats the max bhp people have had out of these with just a 255 walbro and no fuel reg??
Car is a 05STi with supporting mods to see over 430.
Thanks
Bernie

71/200

iTrader: (2)

On the OE reg and 650,s you will have head room.

Mine is sitting 420ish with a fair bit of duty left.

jd5217

450bhp, injector duty at 100% at 7000rpm, walbro pump and oem fuel pressure regulator.

Bosch in tank and aftermarket fpr being fitted soon.

bern11

iTrader: (13)

Hmm thought about that.Thanks for the info

jd5217

you will be able to squeeze a bit more if you fit an aftermarket fpr and up the fuel pressure.

bern11

iTrader: (13)

Just gonna get some 800's i think

jd5217

Depends on what power you are aiming for.

joz8968

iTrader: (13)

As above, it'll be easier if you tell us how much power you're after either now or in the forseeable future. That way we can tell you the correct sized injectors to fit...

bern11

iTrader: (13)

I'm at 430 atm...But it's quite rich so needs leaning out a bit.So whilst it's on the rollers getting tweaked i might run a meth map as well,so thats why i was just wondering what they'll max out at without adding a fuel reg

joz8968

iTrader: (13)

Well, 550s seem to do 390-420bhp, so reckon you'll be fine on the 650s...

bern11

iTrader: (13)

Thanks for that

gus sti8

iTrader: (5)

good money after bad bern!

matt-c

iTrader: (5)

Make sure you get proper ones, rather than modified IMHO