I'm running stock cam, stock compression, Jun valve spring, port & polish, AEM cai, Mugen header-back with no cat, fully balance engine bottom, and mugen computer. I can't figure out why my spark plug is still white(lean) with my FPR set at 60 psi (vaccum hose off). can someone help me pls?!

 

how is the car accelerating.. does it stumble and hesitate when reving near "v-attack"... stock is somewhere in the high 50psi's i beleive.. maybe you should up the psi a bit

 

power is fine without stumbling.

 

bump it up a bit. see how the plugs look. just make sure your idle doesnt go wacky

 

I'm going to try 65 psi tomorrow, hope that'll make my engine running healthier !!

 

yah, with that P&P (depending on the stage), yer gonna want to bump the psi to match the air.

 

thanks man ...hope the problem can be solved simply by adjusting FPR.
If the spark plug is still white(lean) after running 65 psi, what kind of problem will it be?
BTW I've also heard too much fuel will hurt the engine as well. is that correct?

 

if this doesnt solve it, then i really dont know. what kind of gas do you put in?

from what i am experienceing right now, too much fuel gives you this nasty pulsating idle. so you can kinda tell when you are giving it more than it wants. im sure that too much fuel hurts then engine, but i dont know exactly what will happen.

 

94, thanks and appreciate your help