has anyone ever had this problem, ive done the mpfi swap, running a pm6 ecu, stock si injectors, brand new si dizzy, z6 mani, oem map sensor, everything pretty much stock, or oem si stuff...but my autometer a/f guage is showing im runnin really rich, like almost off the guage, and my gas mileage is around 28 mpg, with a good bit of highway

 

pm6 makes it run a little rich, and i wouldnt trust your autometer a/f gauge. 28mpg is the lowest i got with mine, usually it was a little higher. it slightly worsened from dpfi mileage.

little things that could make a big difference: do you have an adjustable FPR? your fuel pressure could be off. whats your timing set at? IMO it doesnt seem like you have a serious problem, i would check those minor things and say its good.

 

i do have an adjustable fpr, but its at 32 psi. which is lower than stock actually, i turned it down a bit to adjust for the even richer condition i had before i turned it down...I heard the pm6 was a bit of a fuel saver tho, thats why i went from a pr4 back to the pm6

 

thought 28 was stock correct me if im wrong but i got over 35 mpg with dohc zc and 32 with mini me zc was with dx tranny and mini was with si

 

try putting the stock FPR on there and see what happens. alot of fuel pressure gauges are bogus.

 

i tried that a while back and it made it worse, so i think my guage is right...I mean soon here im gonna be putting in my pr4 which i chipped and made a basemap with turboedit so im gonna try and just compensate for it that way, but i would still like to know what is causing it

 

timing?

 

just a tad advanced