boostedgsr1234

hey guys, having a bit of trouble with my fuel pressure, i was getting it tuned on hondata s100 and everything was fine untill we got up toward the 340 whp range then we found that my fuel pressure was starting to slowly die off around the 6000 rpm range, the a/f ratio was reading between 10 and 11.5ish then once it got up to around 6000 rpms it started to lean out and went up to high 12's
iv sent my rc 750's to rc to get serviced so they are fine and i know the injectors can handle close to 500whp, also the pressure at the filter is fine at idel its 51 psi and goes up to mid 60's at full boost, i also checked the return line and that is fine, the only thing i can think of is the regulator (any way i can test it?) please help thanks

markaria

2 things to check (I've had both of these problems myself):

1) as dumb as this may sound... i ran into a "wall" and couldnt make more than 370whp due to running out of fuel on my 750'c... turns out my fuel filter wouldn't let enough fuel through! I tried bigger injectors/different fuel pump/etc. Finally, I swapped fuel filters and voila, PLENTY of fuel

2) get rid of the "fuel dampener" if you still have it on your fuel rail. Its the plastic covered thingy that connects your fuel line from the filter to the rail.

good luck!

boostedgsr1234

yea i just installed an new filter but how do i take out the dampener? do i have to replace the whole line? i didnt know i had one in there

boostedgsr1234

bump

93supercoupe

sounds like a pump probleme, or just a bad regulator.

What pump is in the car now?

And ur AF ratio being that rich is going to do more harm then good.

boostedgsr1234

its a walbro 255

boostedgsr1234

it only goes up to the 12 area in 3rd gear but in 4th and 5th gear it is rich at full boost and high rpm this is really confusing me iv checked just about everything

boostedcivicsir

try removing the pulsator like said.