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boost leaks?

Discussion in 'A4/S4 forum(B5 Chassis)' started by xxbmxlsxx, May 16, 2008.

  1. xxbmxlsxx
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    xxbmxlsxx New Member

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    i have the apr software on my otherwise stock 2001 s4. it seems to make a little squeeling or hissing sound under boost and sometimes howls at cruising speed. is this boost leakage? what divertors should i run and how should i address this issue? seems to kinda jerk around sometimes as well
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  2. andybnwc
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    andybnwc Member

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    howl could be signs of turbo faliure ,as for divertors oem 710N divertors are just as good as any after market and cheaper too. Do a full vag com scan and also a proper pressure test along with a visual check of all visable hoses , pull off bottom intercooler hoses and look for large pools of oil pouring out. hope this helps
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  3. Blue_Thunder
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    Blue_Thunder Active Member

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    Squealing will probably be the turbos overspinning due to a leak.

    As Andy says, get a pressure test done.
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  4. stapo69
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    stapo69 All hail the mighty quattro!

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    My blown diverter valve did make a bit of a squeek under full boost sometimes cos of air leaking past the diaphragm.
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