car stays lean
 

ok, b18b, t3/t4 turbo, no ignition or fuel mods except for fmu. what would cause this thing to start up and run lean non stop? I started it yesterday and it was perfect.

Re:car stays lean
 

what afr are you getting?

Re:car stays lean
 

all the way to the lean side of the gauge

Re:car stays lean
 

all the way to the lean side of the gauge

Re:car stays lean
 

oh, ok, I'm guessing you have an autometer?

Re:car stays lean
 

yeah it is. all i did was take off a p.o.s. nissan turbo and put in a garret. didnt change any hoses or wiring. I put the three check valves in with the map the correct way.

Re:car stays lean
 

ok, are you aware that the autometer is narrowband and is innacurate. You should really get a wideband on your car and find out what afr's you really are running.

Re:car stays lean
 

so you saying the car might not be lean at all?, i mean it was rich before i did this swap, and with the same gauge

Re:car stays lean
 

It may not be. That gauge probably just bounces all over the place like a light show.

Re:car stays lean
 

no stays lean, maybe go up one bar

Re:car stays lean
 

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

Re:car stays lean
 

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.

Re:car stays lean
 

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

Re:car stays lean
 

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.