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High pitche whistle after dinan intake install, is it normal?
i can hear the supercharger alot more now and the deeper sound during acceleration but i also hear a high pitch whistle every now again almost high pitch enough to be a dog whistle is this normal?
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Yotie- 06 MCS Dark Silver, Automatic, Convenience Package, HK Stereo, DINAN S2 Package including Dinan Camshaft and stage 6 software, Mini JCW Boost gauge set up. Black JCW Carbon Fiber spoiler, KUDA Garmin Dash mount, Kuda Iphone mount. COMING SOON Breyton GTS-R wheels with Black with red stripe and Aero kit with M7 Grills
At about 3300 rpm I can sometimes hear a bit of something...but I only had it for a week.....I then did a pulley....and the supercharger whine got a bit more pronounced....now I can't hear anything....unless I try really hard, and even then I am not sure.....
With the Alta's the whistle is Very loud....it has been postulated that we all have the whistle...just some intakes muffle it better than others, or just simply overpower it with supercharger wine.
I think Blimey had a jcw with a loud whistle....tracked it down to the throttle body or something....said it was much worse on a jcw.
Overall I would say get a pulley.....I waited.....and debated.....finely did it....it simply transforms the car. There is some debate on what reduction to use, but with an auto, since you rpm's are generly lower than a stick, the 17% should be safe...it simply amazing....gets rid of the lag you get with the a/c on too.
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l 2005 MCS l 11-04 Production l owned since new l RMW Tuned l Craven -17% Pulley l Craven Speed STD l Dinan CAI l JCW 380's l H&R 19 MM Swaybar l MSD Ignition l Power Steering Fan Duct l LightInSight l "EURO" MINI Armrest l Euro Parcel Shelf l Brake Light PULSAR(gen2)l Detroit Tuned Tensioner Stop l Blitzsafe/xmradio l Cobra 19IV CB l 4.5' Francis CB25 CB Antenna, mounted on the rear tow rig!!
its the supercharger bypass valve. at partial throttle (usually low rpms) the valve is not all the way cosed, but it only partially open, because it does not use the full vacuum to keep it closed( or is it the reverse way.. i cant remember, all i know is installing the DT BPV makes it go away almost completely, or it did for me). it vibrates a bit causing the air to whistle. If you step on it, youl never hear it, cause the valve will close. no more whistle. But yes its normal. The stock intake just muffled it enough so you cannot hear it.
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¤Wïzå®Ð €ÿ매 1FSTMNI
Yotie- 06 MCS Dark Silver, Automatic, Convenience Package, HK Stereo, DINAN S2 Package including Dinan Camshaft and stage 6 software, Mini JCW Boost gauge set up. Black JCW Carbon Fiber spoiler, KUDA Garmin Dash mount, Kuda Iphone mount. COMING SOON Breyton GTS-R wheels with Black with red stripe and Aero kit with M7 Grills
03 MCS b/w, checkered rear spoiler & rear view mirror caps, xenons, Katzkin custom leather/suede interior, alta 15%, lightbar (55watt hid), 19mm sway, cold air. 7.5J 17 BBS CV, 
