Running Rich-rough idle with supercharger

Tombonombona

Just wanting to pick you tuning gurus' minds for a moment. Last week the car ( 2012, 6mt, stage 2 gtm supercharger ) started running a little off, and getting progressively worse until the point where it can barely stay running at idle. I don't have a afr gauge, but I am just charging my laptop to go plug uprev into it to check. I know its rich because its giving little puffs of black at the exhaust and spraying tiny specks of soot... All last year I never had a single issue with it. I'm thinking a sticky bypass valve might be the culprit, but would a constantly venting valve cause it to run like that?

Update. I was able to actually have a peak while it was running (barely) and it looked like the bpv was closed. I'm very confused.

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Tom B.
Exotic Speed R2 Titan Catback-GTM Stage 2 Supercharger 522 whp on a mustang dyno
2004 Subaru STi *SOLD* *WRITTEN OFF*

Tombonombona

Another update.... Just checked the afr at idle and it is at 10.000 : 1...... So that's not particularly good

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Tom B.
Exotic Speed R2 Titan Catback-GTM Stage 2 Supercharger 522 whp on a mustang dyno
2004 Subaru STi *SOLD* *WRITTEN OFF*

theDreamer

You running a custom tune or GTMs can tune?

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theDreamer's Z // Fast Intentions // Uprev // GTM // HKS // TEIN
theDreamer's Silvia // URAS // GREDDY
Houston Zs // Facebook // Twitter // Instagram

Tombonombona

Custom GTM tune I am pretty sure...... When the kit was installed, did the data-logging on the dyno at the shop, they sent that off to gtm who sent back an amended tune... Rinse was repeat a few times and there I went.... It gave me no issues at all last summer.

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Tom B.
Exotic Speed R2 Titan Catback-GTM Stage 2 Supercharger 522 whp on a mustang dyno
2004 Subaru STi *SOLD* *WRITTEN OFF*

theDreamer

Ok, so still GTM canned tune mostly.
I had a rough idle problem with their tune even after doing the data logging and tune revisions (went through 20ish). Went to a local tuner who does VQ and it was the fuel/MAF settings that needed to be adjusted. GTM never adjusted this with the can tune, which is not a negative but on some cars it needs to be changed to allow for a smoother idle.

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theDreamer's Z // Fast Intentions // Uprev // GTM // HKS // TEIN
theDreamer's Silvia // URAS // GREDDY
Houston Zs // Facebook // Twitter // Instagram

Tombonombona

Damn. I don't have a local tuner really. Closest is six hours away. And you are right, it probably is still a canned tune... It is just weird that it all of a sudden went for **** in the past week as well as it seems like a boost issue, can hear it venting unless I really honk on it.

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Tom B.
Exotic Speed R2 Titan Catback-GTM Stage 2 Supercharger 522 whp on a mustang dyno
2004 Subaru STi *SOLD* *WRITTEN OFF*

theDreamer

Yeah, mine was fine for about 8-12 months and then when Texas summer came back around my idle was terrible. Cold start ups were ok for a bit but once in low operating temps the idle would just drop out and almost stall (400-500rpm).

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theDreamer's Z // Fast Intentions // Uprev // GTM // HKS // TEIN
theDreamer's Silvia // URAS // GREDDY
Houston Zs // Facebook // Twitter // Instagram

Tombonombona

Sounds kind of like mine, except nothing has changed for me, not even temp... Was yours spitting soot out the back also?

__________________
Tom B.
Exotic Speed R2 Titan Catback-GTM Stage 2 Supercharger 522 whp on a mustang dyno
2004 Subaru STi *SOLD* *WRITTEN OFF*

theDreamer

Probably but never noticed, my exhaust tips turned black though but nothing ever on my bumper or on the ground I saw.

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theDreamer's Z // Fast Intentions // Uprev // GTM // HKS // TEIN
theDreamer's Silvia // URAS // GREDDY
Houston Zs // Facebook // Twitter // Instagram

Tombonombona

Ah... Mines pretty bad in that case... Definitely need to have it retuned I think then, somehow

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Tom B.
Exotic Speed R2 Titan Catback-GTM Stage 2 Supercharger 522 whp on a mustang dyno
2004 Subaru STi *SOLD* *WRITTEN OFF*

theDreamer

You might try to make the drive to your tuner that is closes, or you could do another remote tune by another company.
I will throw this out, but you will need to contact shops/tuners to get details but some tuners can do remote tuning. Basically get your car on a dyno, tuner remotes in to a laptop and makes adjustments since they can see the dyno results/details in real time. Will just have to coordinate getting some time on a dyno and a tuner who can do remote tuning.

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theDreamer's Z // Fast Intentions // Uprev // GTM // HKS // TEIN
theDreamer's Silvia // URAS // GREDDY
Houston Zs // Facebook // Twitter // Instagram

Tombonombona

Thanks. That sounds like a reasonable idea. I'm a couple miles away from a dyno... and I think UpRev themselves might even do this. I will have to look into it.

__________________
Tom B.
Exotic Speed R2 Titan Catback-GTM Stage 2 Supercharger 522 whp on a mustang dyno
2004 Subaru STi *SOLD* *WRITTEN OFF*