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Forced Induction Forum Sponsored by Active Autowerke
Discuss supercharging, turbocharging and even nitrous and water injection here.
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Old 07-19-2013, 08:10 PM   #1
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Rich/loss of power issue on Gen 7 Level 2

Recently, my car goes to 10.0 AFR on WOT at 6K RPM and higher. It was running great for the first 3 weeks after I installed stage II.

Here is the dyno graph from when I took it to the dyno 3 weeks ago:



Here are some things that might be related:

(1) Car was misfiring due to a bad coil so I decided to change all 6 with Bosch OEM ( Rich issue started occurring after coil changes)
(2) After installing stage II, the BOV doesn't sound the same on high boost. It sounds fine on low RPM's, but when it's in high RPM it sounds like air is not being released with pressure like before
(3) The car bucks on low RPM - mostly at around 2K-2.5K RPM. When I press the gas at those RPM's, it jerks back and forth very aggresively
(4) I took off the fake Greddy BOV and inspected it and saw no tear but ordered the TIAL 50MM that Kris suggested anyways

Anyone have any ideas as to what it may be? I am thinking its the BOV leaking air so manifold is loosing pressure at high boost so the car goes rich since air is escaping.
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Old 07-19-2013, 08:41 PM   #2
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small vacuum line at the rail that goes to fpr?
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Old 07-19-2013, 09:14 PM   #3
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I checked that line and it's intact. Vacuum is at 24-26 and steady idle with no fluctuations/idle hunt.
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Old 07-19-2013, 10:34 PM   #4
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Spark plugs, spark plug gap, new OE coils. I really bet this is where your problem is.

Plugs are cheap, even if what you have is brand new, buy another set for testing. I'm sure you run one or two steps colder, but if your not, now is the time. If your running your plugs at factory gap, try gapping down to .026-.028.
If you still have your five (5) old coils, try putting them back in, one or many of your new coils may be substandard.


Good luck.
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Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
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Old 07-20-2013, 11:19 PM   #5
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Quote:
Originally Posted by Rob43 View Post
Spark plugs, spark plug gap, new OE coils. I really bet this is where your problem is.

Plugs are cheap, even if what you have is brand new, buy another set for testing. I'm sure you run one or two steps colder, but if your not, now is the time. If your running your plugs at factory gap, try gapping down to .026-.028.
If you still have your five (5) old coils, try putting them back in, one or many of your new coils may be substandard.


Good luck.
Thanks for your help, Rob. Someone on another forum mentioned to check the meth nozzle as it might be over spraying.

I turned off the Meth system, did a couple of pulls and everything is back to normal. The car pulls really strong again.

AFR was around 11.7-11.9 on WOT.
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