Rough idle with forced induction

Mitco39

The BOVs on our kits are pre mAF, so they are not releasing metered air.

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2007 Chevy Duramax - EFILive Tuned By Me
2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me
The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her
My Build --> http://www.the370z.com/members-370z-...39s-build.html

Mitco39

Also have them try copying the main fueling table into the cold fueling table and see how you make out with that. Also if they have time have them play with the timming right around idle... IIRC mine is at or right around 66, not sure what uprev calls 66, but thats what it is in the table, lol.

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2007 Chevy Duramax - EFILive Tuned By Me
2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me
The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her
My Build --> http://www.the370z.com/members-370z-...39s-build.html

jwick

Hit me with the stupid stick if we covered this already but are any of the fixes we are kicking about do anything for the stumbling hiccup as you come off closed loop cruise to standstill idle? Or all just centered around the searching idle?

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

Mitco39

Mine doesnt really hiccup all that much anymore. I would suggest pulling the car into closed loop sooner and see if that gives the car time to settle down before you notice it. I actually have mine to pretty much wait till boost to switch over to open loop, its a bit more aggressive than I had before, seems to work fine tho

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2007 Chevy Duramax - EFILive Tuned By Me
2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me
The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her
My Build --> http://www.the370z.com/members-370z-...39s-build.html

NeverBoneStck

Bringing this back to life. What is the fix for this for us with a BP kit

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Juiced! That is all you need to know !!

jwick

I personally think the fix is to route the crank case back pre-turbo rather than venting it to atmosphere, but nobody has ever been able to try it cuz the filter is directly on the turbo. With Sasha’s new intake relocating the filter, it would be possible to modify that intake pipe to accept the hoses. Of course that’s a theory.

If someone tries it, I’d probably recommend a minor retune.

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

soill370z

Anymore updates on this? Deleting pcv helps?

The Weapon

Seb had me add two more filters to vent the hoses that go into intake manifold and plug the manifold ports.

Seems to solved any idle issues I have except when I'm on 91 and my iat hit over 120*. It gets a little weird but not nearly as rough as it was. With E85 my idle is perfect regardless of IAT. I've had it up to 145* and still no problems.

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Boosted Performance Comp Turbo - Tuner- CJM Fuel Return- Modified Berk CBE- ZSpeed Stage 4 Clutch - Southbend Flywheel - Tuned by Seb ~650whp - HKS Coilovers - SPL - Focal Audio 4 way Active - Audiocontrol DSP - Work CR 2P

jwick

You got a picture of that?

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

The Weapon

You can add the filters to the stock hoses, i added mine directly to the ports on the engine.




I'm sure every tuner is different but i asked about deleting the 2nd O2 sensors and he said not to, he uses them to still help provide fuel trims. They were a bit close to the clutch line for my liking and was hoping to get rid of them completely.

The original tuner in Tucson did just a SD tune and the car ran like crap. I had to get it retuned by Seb from what i understand (which is very little) Seb did a hybrid tune with MAF and SD as needed and the car feels like its stock now when i'm just cruising around town off boost.

My Vacuum at idle was reading about 15 inHg pre the addition of the 2nd set of filters and now its around 18-20 inHg.

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Boosted Performance Comp Turbo - Tuner- CJM Fuel Return- Modified Berk CBE- ZSpeed Stage 4 Clutch - Southbend Flywheel - Tuned by Seb ~650whp - HKS Coilovers - SPL - Focal Audio 4 way Active - Audiocontrol DSP - Work CR 2P

soill370z

Will oil not blow out into the engine bay under boost? Would a catch can be better? Would drilling out the pcv to vent more or converting them to open an fittings be a benefit?

The Weapon

1500 boosted miles so far and i don't see any oil in the engine bay at all. Catch can is probably better but i dont think its necessary for a street car. Not a lot of my time is spent at wot and full boost.

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Boosted Performance Comp Turbo - Tuner- CJM Fuel Return- Modified Berk CBE- ZSpeed Stage 4 Clutch - Southbend Flywheel - Tuned by Seb ~650whp - HKS Coilovers - SPL - Focal Audio 4 way Active - Audiocontrol DSP - Work CR 2P