grittyspeed

ok...i just drove it and it gave a pop out the exhaust under low boost. definatly lean. got good fuel pressure, and vacuum is around 20 at idol

90turbohatch

maybe you are lean. I'm just saying I wouldn't trust that autometer gauge. Switching turbos very well may be putting more air into the motor at the same boost level.

grittyspeed

yeah true...i will get a new gauge, but any idea why the car has gone from rich to lean?

alwaystootall

so it says its lean at idle??

...lets say ur car was properly tunned( a little more on this later) using a small .48/.42 t3. and u slap on a 60-1 with the same tune,and same amout of boost, it will affect ur a/f ratio. even if u used the same size turbo(as far as housings) and whent with a diif. trim, that will afffect it also.

when i ran a fmu, my car to the best of my knowlage ran lean. atleast thats the way my motor loked when i took it apart. TUNNING is the biggest part of a turbo setup. i never realized just how important it was until my oil pump gear broke and i took my motor apart. i was loosing power from running lean,it was harder on my pistons/ rings/ and i was losing power from the knock sensor retarding my timming(it was picking up detination *sp* that i could not hear). i have read the detination can cause vibrations in ur engine, and can lead to bearing/ oil pump failure(i dont believe this was the whole reason my oil pump gear broke but i know it didnt help).

so anyway i have rambled on enough. bottom line: no more guessing. get it tunned

P.S. this needs to be in a diff section. u might get a better response there.