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Hopefully someone knows what this is... When I shift from 2nd to 3rd at about 3000 rpm I get what sounds like a clunk,but with the windows down it sounds more like a backpressure pop. I also hear this noise sometimes going from 3rd to 4th. It doesn't happen when I drive like a granny or when I am getting "on it". Only on normal acceleration.<p>The only mod I have done is the Resonator Removed.<br>Thank You!!
 

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Re: Backpressure pop? (moravecb)

If you have an MT, it is normal. A lot of the folks on the board have learned to embrace the "pop" and have fun with it at opportune times.<p>I have only heard it once on my GT after the IPD Stage2 flash and I thought it was kinda cool actually. I might get sick of it if it happened all the time though.<p>-Ben
 

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Re: Backpressure pop? (moravecb)

Mines pops all the way to grandma's house (and back). I have the resonator removed as well and it pops a lot more with that gone.
 

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Re: Backpressure pop? (moravecb)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>moravecb</b> »</i></TD></TR><TR><TD CLASS="quote">So it is just backpressure??</TD></TR></TABLE><p>unburnt gas on the overrun of the turbo exploding...........
 

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Re: Backpressure pop? (moravecb)

Jim's explanation says it all. The popping happens even more once the center resonator is removed for some reason.
 

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Re: Backpressure pop? (Vipergtsz3)

it's happened quite a bit on my GT, usually from 1st-2nd and 2nd-3rd in GT mode at high revs when changing gears.
 

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Re: (nikhsub1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>nikhsub1</b> »</i></TD></TR><TR><TD CLASS="quote">Happens all the time in my gt... </TD></TR></TABLE>...and it sounds lovely. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0">
 

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Re: Backpressure pop? (moravecb)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>moravecb</b> »</i></TD></TR><TR><TD CLASS="quote">Hopefully someone knows what this is... When I shift from 2nd to 3rd at about 3000 rpm I get what sounds like a clunk,but with the windows down it sounds more like a backpressure pop. I also hear this noise sometimes going from 3rd to 4th. It doesn't happen when I drive like a granny or when I am getting "on it". Only on normal acceleration.</TD></TR></TABLE><p>I've got it too on my '04 mt. Talked to my service supervisor and he said that it had been designed in by volvo, that they (asrervice techs) had asked several times for a fix and got nothing. <IMG NAME="icon" SRC="http://www.vwvortex.com/zeroforum_graphics/screwy.gif" BORDER="0">
 
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