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Old 08-13-2018, 08:39 AM   #15
mattpowers
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Quote:
Originally Posted by uglybastard View Post
im curious about this mystery downpipe although i think it has nothing to do with your issue.
It's really just a mystery because I don't think the previous owner knew about it. He seemed honest, and said the tune was the only mod. I haven't had a chance to get it on a lift yet. It looks like an ebay pipe, with a cat welded in. looks like 3".


Here it is!

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Originally Posted by uglybastard View Post
if you're running a stock CAI that might be part of the issue - aftermarket intakes help with throttle response
I actually just installed a CTS intake, but the issue is essentially the same.

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Originally Posted by smanierre
Is the downpipe catted or catless?
Catted, I believe. I may investigate this exhaust situation more, to see if it's an issue.
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Old 08-13-2018, 08:45 AM   #16
uglybastard
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is your secondary air filter attached well?
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Old 08-13-2018, 08:59 AM   #17
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is your secondary air filter attached well?
I put a filter on it when I did the intake install, if that's what you mean. I never really knew where the SAI piped TO.
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Old 08-13-2018, 09:39 AM   #18
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I put a filter on it when I did the intake install, if that's what you mean. I never really knew where the SAI piped TO.
nevermind that idea.... thinking more, IIRC the SAI helps pull air from the bay to push out exhaust "more efficiently" to control emissions during startup... not during driving...
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Old 08-14-2018, 01:11 AM   #19
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Quote:
Originally Posted by mattpowers View Post
It looks like an ebay pipe, with a cat welded in. looks like 3".
That actually looks like a 42DD (42 Draft Designs) down pipe
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Old 08-14-2018, 07:20 PM   #20
mattpowers
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That actually looks like a 42DD (42 Draft Designs) down pipe
Good call, I think that might be it! Glad it's something that might be decent.
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Old 08-14-2018, 09:20 PM   #21
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if you're hitting 17-18 psi boost i don't think it's a boost leak after all, that sounds about right for stage 1 APR.
So I just found out that the car IS running stage 2 tune, although possibly an older revision. Does this bring us back to the boost-leak idea? What PSI should APR stage 2 be? Only mods are that DP, intake, and DV+.
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Old 08-15-2018, 07:49 AM   #22
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So I just found out that the car IS running stage 2 tune, although possibly an older revision. Does this bring us back to the boost-leak idea? What PSI should APR stage 2 be? Only mods are that DP, intake, and DV+.
depends on the revsion but the ranges is about right for stage 2. could be a small leak but hard to say without taking the time to chase it.

have you done a coolant flush lately? really grasping at straws here....
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Old 08-19-2018, 09:31 PM   #23
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Welp, got it checked out at the dealership, and after an extremely thorough assessment, word is there's nothing wrong. The exhaust sound is normal DSG diverter valve stuff, and the lag in boost is heatsoak.... Upgraded intercooler is in the mail... Thanks for chasing this with me guys! It was pretty great confirmation, however, to have two VW techs say they couldn't find anything out of order, after 2 hours driving and running the scan tool.
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