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Old 11-18-2019, 07:44 PM   #1
Smclaire
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Default Invidia downpipe install November boost

I installed a invidia catless downpipe and Perrin cat back today. Did a COBB AP stage 2 93 tune. I am experiencing low boost and the af correction at idle is at -25%. Iím thinking it might be I didnít replace the gaskets. Any thoughts on this?
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Old 11-18-2019, 07:49 PM   #2
kgharrin
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Default Invidia downpipe install November boost

Sti? What year? Stock intake? Check for a vacuum leak. Your catback gaskets are not the issue here.
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Old 11-18-2019, 08:14 PM   #3
Smclaire
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04 wrx stock intake
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Old 11-18-2019, 08:23 PM   #4
kgharrin
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Actually a vacuum leak should cause a positive fuel trim not a negative at idle. Also I wouldnít run an OTS map designed for a catted downpipe with a catless downpipe.
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Old 11-18-2019, 08:35 PM   #5
Smclaire
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I was planning on getting a pro tune but canít until December. Do you think a pro tune would fix it?
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Old 11-18-2019, 09:24 PM   #6
Fndragn
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So you put the downpipe on now and can’t get it tuned until December? Why didn’t you wait until the day before your tune to swap out parts you can’t support? Hopefully it makes it to your tune!
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Old 11-18-2019, 09:31 PM   #7
kgharrin
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Default Invidia downpipe install November boost

Pro tune might cover it up but I would dive deeper and hold off on driving for now if possible. The only time Iíve seen trims that negative at idle is when the MAF scaling is incorrect. Verify in the map notes that the stage 2 tune you loaded does not require a Cobb intake as well. That would cause it to pull a bunch of fuel like yours. I donít remember if the older modelís ďstage 2 ď was with an intake and downpipe or just downpipe.
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Old 11-18-2019, 09:44 PM   #8
Smclaire
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Thanks. Ya I donít plan on driving it until I get a pro tune. Itís not my daily
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Old 11-19-2019, 11:26 AM   #9
Gallo2011
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Also, define "low boost". 3 psi? 19 psi? Be specific.
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Old 11-20-2019, 04:01 PM   #10
Smclaire
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Quote:
Originally Posted by Gallo2011 View Post
Also, define "low boost". 3 psi? 19 psi? Be specific.
8 psi driving it ďnormallyĒ
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