Blk003GT

i have a built shortblock with a walbro 255. and at around 6000rpm he said that i was starting to lean out so they couldn't pulley down and bump up the horsepower above 400whp. does this sound right?

Frostbitten

yes you need 2 pumps

texas_stang02

doesn't sound right to me. i'm running the Focus pump (190 lph i think), mine made 403 rwhp at 6000 rpm and wasn't leaning out at all. what size injectors are you running? i've heard that a Walbro 255 pump with 42# injectors is good to at least 450 rwhp.

mustang_pa

some stangs can make over 400whp and not go lean with an svt focus pump. I heard it just depends on the pump. Me personally, i would do a boost a pump just in case.

mustang_pa

double post @#$^&$$@!

Blk003GT

42lb injectors with a walbro 255lph. yeah and i guess they could just be playing it safe which isn't a bad thing.

P.S.I.cho

boost-a-pump for sure

vanquish

+1 I hear the same thing about that pump.

Blk003GT

k cool. i will do a boost a pump soon and bump it up a little bit! thanks