kleach18

Does anybody know if there is a difference between a 90 NA afm and a 90 Turbo II one?

I have a 90 GTU but it has a turbo II motor. I have a custome built turbo inlet but I have the stock NA afm on it.

When ever I get to about 5k it just spits and backfires like its running very rich. I recently installed a super-afc and that helped a little bit, but the problem is still there.

Anybody have any input?

kleach

NoPistons4Chris

i think that afm for turbo's is geared more toward better air flow..i think it's somewhat bigger..if i'm wrong..someone correct me or reiterate what i'm saying..thanks

NoPistons4Chris

oh yeah, i think it's calibrated for ecu and a/f mixture..

NZConvertible

The NA and Turbo AFM's have different springs and different calibration, and should be matched to the ECU you're using. I would be concerned that the NA AFM would reach maximum travel too early when being used on a turbo.

That means you haven't even had it tuned. What's the point of even having it if you're not going to tune it? Sounds like you're running the Turbo injectors with an NA ECU, which will result in rich mixtures. Get it dyno-tuned.

kleach18

I installed a 90 Turbo II ECU but kept the na afm
(couldn't get ahold of a turbo II one)

jon88se

if the NA ECU runs a TII on the rich side, is there any benefit to those running without AFC's or standlones in terms of added safety for mods like TID, downpipe etc...

jon88se

bumpity