Hissing Sound After Downpipe Install

LYEGUY · 02-27-2018, 12:43 AM

Hello,

I have just installed castles downpipes and during a cold start, and low revs I hear this very distinct hissing/rush of air sound. I know you're supposed to hear more turbo spool but im not sure this is the turbo, would you hear the turbo on a cold start? Once I get above 2k RPMS I cant hear the sound anymore it's only during a cold start or revving at idle or when taking off. I was thinking a leak between the turbo and the downpipe but I was wondering if anyone on here could help me out?

NoQuarter · 02-27-2018, 11:13 AM

Too hard to do internet troubleshooting with such a vague description i am afraid.

You are going to have to some more investigation first.

02-27-2018, 12:43 AM	#1
LYEGUY First Lieutenant 48 Rep 310 Posts Drives: Titanium Silver E92 335 Join Date: Mar 2016 Location: North Kingstown, RI iTrader: (3)	Hello, I have just installed castles downpipes and during a cold start, and low revs I hear this very distinct hissing/rush of air sound. I know you're supposed to hear more turbo spool but im not sure this is the turbo, would you hear the turbo on a cold start? Once I get above 2k RPMS I cant hear the sound anymore it's only during a cold start or revving at idle or when taking off. I was thinking a leak between the turbo and the downpipe but I was wondering if anyone on here could help me out?
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02-27-2018, 11:13 AM	#2
NoQuarter Captain 166 Rep 906 Posts Drives: 2008 535xi / 2011 Z4 35Is Join Date: Jan 2011 Location: Indiana iTrader: (0) Garage List 2018 BMW X2 [0.00] 2008 535xi [0.00] 2011 Z4 35is [0.00]	Too hard to do internet troubleshooting with such a vague description i am afraid. You are going to have to some more investigation first.
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