VT2-625 with exhaust whistle/screech

F12M6MD · 09-23-2015, 01:27 PM

VT2-625 on E92 M3
Test pipes, secondary cats, X-pipe, resonators, and magnaflow mufflers.

Different than the slight supercharger whine or pitch, in the 5000-8000 rpm range under full throttle, I'm hearing a whistle or screeching noise almost like a distant tire losing traction (but no traction is being lost nor is there a traction light coming on in MDM mode). My installer confirmed that my belt is not slipping. The sound seems to be coming out the rear of my car rather than from the supercharger position itself. I'm just checking to see if this is a normal noise for this type of supercharger or is it a product of my exhaust setup? Thanks for your input.

Mark

squartus · 09-23-2015, 02:14 PM

Perhaps an exhaust leak causing a whistle? I have a vt2 625 with test pipes and AA exhaust, no whistle or anything from exhaust.

GabeS · 09-23-2015, 02:49 PM

100% sure its not coming from the intake?

CIFUM3 · 09-23-2015, 03:24 PM

I have the same kit and no "whistles" that I've heard. I have a BOV that goes off when I'm off the throttle

F12M6MD · 09-23-2015, 10:41 PM

My installer claims it's from the supercharger but my exhaust is custom and has been chopped and welded many times. It's likely my exhaust after reading your input. It is only while on throttle not coming off. I'll get that looked at again. Thanks.

Mark

09-23-2015, 01:27 PM	#1
F12M6MD Lieutenant 324 Rep 498 Posts Drives: Rivian R1T Join Date: Dec 2012 Location: TX iTrader: (0)	VT2-625 with exhaust whistle/screech VT2-625 on E92 M3 Test pipes, secondary cats, X-pipe, resonators, and magnaflow mufflers. Different than the slight supercharger whine or pitch, in the 5000-8000 rpm range under full throttle, I'm hearing a whistle or screeching noise almost like a distant tire losing traction (but no traction is being lost nor is there a traction light coming on in MDM mode). My installer confirmed that my belt is not slipping. The sound seems to be coming out the rear of my car rather than from the supercharger position itself. I'm just checking to see if this is a normal noise for this type of supercharger or is it a product of my exhaust setup? Thanks for your input. Mark __________________ Rivian R1T
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09-23-2015, 02:14 PM	#2
squartus Major 314 Rep 1,017 Posts Drives: 2010 E92 M3 6MT Join Date: Apr 2013 Location: Mississippi iTrader: (0) Garage List 2010 E92 BMW M3 [10.00]	Perhaps an exhaust leak causing a whistle? I have a vt2 625 with test pipes and AA exhaust, no whistle or anything from exhaust. __________________ 4.4L LC stroker/ESS VT2-625/Volk te37 sl's/AA exhaust/DSS Carbon Fiber driveshaft/ARH Headers.. etc
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09-23-2015, 02:49 PM	#3
GabeS Crazy! 1180 Rep 1,440 Posts Drives: E93 M3/Mk4 Supra/X6M Join Date: Feb 2013 Location: Las Vegas iTrader: (1)	100% sure its not coming from the intake? __________________ First "real" widebody M3 ever thread.[url]http://www.m3post.com/forums/showthread.php?p=17461963
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09-23-2015, 03:24 PM	#4
CIFUM3 Captain 103 Rep 999 Posts Drives: 08 E92 M3 Join Date: Jul 2013 Location: Goodyear iTrader: (0)	I have the same kit and no "whistles" that I've heard. I have a BOV that goes off when I'm off the throttle __________________ Performance ESS 625 VT2 Supercharger - CAE Shifter - Revinora race+ axle back - Macht Schnell down pipes - SOSI X-pipe Looks M colors grill - CF trunk - Sapphire Blue Forgestars F14
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09-23-2015, 10:41 PM	#5
F12M6MD Lieutenant 324 Rep 498 Posts Drives: Rivian R1T Join Date: Dec 2012 Location: TX iTrader: (0)	My installer claims it's from the supercharger but my exhaust is custom and has been chopped and welded many times. It's likely my exhaust after reading your input. It is only while on throttle not coming off. I'll get that looked at again. Thanks. Mark __________________ Rivian R1T
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