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jr_ss · 11-14-2011, 06:29 PM

It's always good to have a means to adjust fuel pressure with an upgraded engine. On a bone stock swap it isn't necessary, but not a bad idea. When I did my swap I had a walbro and had an intake, FMIC, full exhaust and an upgraded wastegate running 11lbs on my stock FPR. I would get about 26mpg on the highway like that.

Now since you have an upgraded walbro I have heard of running higher than normal fuel pressures because you have a new pump/old regulator and possibly the diaphragm has gotten weak over time and has trouble with the new volume/psi of the fuel. I'd suggest putting a gauge on your fuel line and see what pressures you're running with and w/out vacuum and go from there.

11-14-2011, 06:29 PM	#2
jr_ss Post Whore! Join Date: Dec 2005 Location: Pa Posts: 6,412 Trader Rating: (35)	It's always good to have a means to adjust fuel pressure with an upgraded engine. On a bone stock swap it isn't necessary, but not a bad idea. When I did my swap I had a walbro and had an intake, FMIC, full exhaust and an upgraded wastegate running 11lbs on my stock FPR. I would get about 26mpg on the highway like that. Now since you have an upgraded walbro I have heard of running higher than normal fuel pressures because you have a new pump/old regulator and possibly the diaphragm has gotten weak over time and has trouble with the new volume/psi of the fuel. I'd suggest putting a gauge on your fuel line and see what pressures you're running with and w/out vacuum and go from there. __________________ My SR20VET Does your VTC gear rattle in your S14/15 SR? PM me.