Z32 Maf Placement

[roast]

If you've read some of my threads, I'm chasing my rich idle condition... I'm wondering if it has to do with my MAF placement.

Could someone comment if this is too close to the turbo?

[Buddyworm]

Are you referring to turbulent airflow from the impeller? Flow reversion from the bigger turbo doesn't necessarily cause a rich condition in my experience, more so a bogging from compressor surge, and yes, that does look too close. See how the motor runs with the MAF unplugged.

*Edit: Sick piecuts btw. Do that yourself?

[Dattebayo]

AFAIK, the MAF should be on the cold pipe, BOV mounted before the MAF. General rule is 12" before the TB. That would solve a bunch of issues IMO.

You'll have to get a tune tho.

[sjbsuperman1425]

looks like ur BOV is venting to atmosphere is it not? If it is, try recirculating it. It may be leaking a little bit at idle casuing a rich idle condition.

[roast]

Are you referring to turbulent airflow from the impeller? Flow reversion from the bigger turbo doesn't necessarily cause a rich condition in my experience, more so a bogging from compressor surge, and yes, that does look too close. See how the motor runs with the MAF unplugged.

*Edit: Sick piecuts btw. Do that yourself?

I'm referring to turbulent airflow from the impeller... I'll unplug the maf and let it warm up... On warm up the afr's are more normal, not perfect though...

I didn't do the work myself, I purchased the car with the bulk of the work done in running condition. I'm sorting out all the small issues that weren't dealt with before and keeping up with the parts that need to be replaced.

AFAIK, the MAF should be on the cold pipe, BOV mounted before the MAF. General rule is 12" before the TB. That would solve a bunch of issues IMO.

You'll have to get a tune tho.

MAF is in the right spot just too close as observed above.

looks like ur BOV is venting to atmosphere is it not? If it is, try recirculating it. It may be leaking a little bit at idle casuing a rich idle condition.

Yes, BOV is venting to atmosphere, I had a SARD R2D2 BOV and threw that out (i thought it was leaking, it didn't fix my stalling issue or rich idle) to buy a Forge BOV and plumb in recirculation. It will be done!

[r34 gtr]

How rich are we talking?

My CA18 was just unhappy idling anywhere but 12.5:1. It idled great, right at 850rpm. I tried to get it to idle at stoich, but it just wasn't as happy.

[roast]

How rich are we talking?

My CA18 was just unhappy idling anywhere but 12.5:1. It idled great, right at 850rpm. I tried to get it to idle at stoich, but it just wasn't as happy.

I'm idling between 11.2-12.1, the car wants to stall out when coming to a stop especially from a high rpm down to idle. If i coast and keep load then clutch in and stop it won't stall.

[roast]

I took the intake pipe off, I need to weld an aluminum bung for my bov and I wanted to extend the pipe as far as I can.

Here's a comparison shot between stock intake and my pie cut mess...


As I was taking it apart I realized that it would near impossible to just "unplug" the MAF... Talk about surprise!



While I'm playing with the intake, the turbo will come out after my measurements are finished and new coolant lines will be run.

[r34 gtr]

OH GOD CRIMP CONNECTORS!!!

[roast]

Are you referring to turbulent airflow from the impeller? Flow reversion from the bigger turbo doesn't necessarily cause a rich condition in my experience, more so a bogging from compressor surge, and yes, that does look too close. See how the motor runs with the MAF unplugged.

*Edit: Sick piecuts btw. Do that yourself?

I ran the car (today) without the AFM connected, on initial warm up, it was at 14.1 AFR then once the cold start cycle completed the car idled at 10.1 steady...

[roast]

Bad news... I have to do a head gasket now... After re-wiring my AFM I warmed the motor up to hunt down the coolant leak, low and behold it was leaking near cylinder #1 behind the exhaust manifold. Last time I blew a gasket it was on #4 running stock boost...