fuel pressure question...

[toolmann]

a while back i was having a stumble problem,like most sy/ty owners,and try'd a few different thing to clear it up...upping the fuel press.to 48 psi at the regulator(vac disc'd) was one of them...
well,i must of had a clogged injector or something cause 2 cans of Chevron Techron cleared it up for the most part...
anyway,i just got around to dropping the pressure back to 45 psi which is what i was told to set it at for a stock fuel pump...but i noticed quite a fall of in power after i turned it down...soo i drove it a couple hundred miles figure'n the computer needed to readapt to the new setting,but after 200 miles it still seems like theres some power loss....can 3 psi of f/p under boost make that big of difference??
it seemed to be running rich (exh.smelled of fuel) soo thats why i turned it back down to begin with.i dident want to croke my cat.dumping too much fuel in there...my theory is too rich is better than too lean-but the best power is made right on the edge...

i have a Walbro i STILL havent put in...but in the mean time,what is the best setting...should i split the diff.and go for 46-47psi??

thanx for any info
T

 

[Lynn D. Brown]

Fuel P

Fuel P

T,

Sounds like something is wrong. Have U measured the O2 w a scan tool ? U really won't know where U R until U do. I would check ignition spark strength also.

Going leaner w lower FP should generally help unless U R running out of fuel and getting real low O2's, which is, of course, means detonation and is a recipe for disaster.