Can somebody explain the noise?

[KatnipBimmer]

okay...this is a rather vane post i know but i am just curious so hold with me here.

I recently attended a dynoday and watched a Dinan M3 supercharged put down some HP on the dyno (295rwhp running 6psi i think). Then i came home and watched some videos with a Supercharged Mustang saleen. (no i'm not a big mustang fan...but i am a 500HP fan)

So my question is why does a Saleen (blower style SC) have that awesome whine when it revs...but a Dinan M3 (centrifical type SC) has nearly zero noise. (i didn't even hear a blowoff during the run). I noticed a VW Corrado also had a similar sound to the Saleens...just much quiter.

Does this have to do with the type of SC or something else that i know nothing about?

[michaelr]

Different superchargers styles sound different and perform different.

The Dinan probably has a Vortec V2SQ CF style ( supposed to be super quiet ) and as you heard it was. You don’t hear a BOV sound due to the fact that the Bypass valve ( not BOV ) re - circulates back into the system and not to atmosphere. ( very quiet also )

The mustang uses a ROOTS ( i think ) type blower and as you heard on the video can be rather loud but sounds really cool. I assume they also use some kind of Bypass valve but don't know for sure.

I have a Vortec V2SQ on my car and I can hear it at idle and at part throttle but at WOT all I hear is the exhaust.

Correct me if I am wrong anyone.

Michael

[KatnipBimmer]

Sounds logical to me. I snatched a vid of a ligenfelter corvette too...and i'm not sure if it's some kind of blowby or just the SC, but it sounds CRAZY and you can hear it coming WAY off.

I think I need to get me one of these blower thingys!!

[Glucas21]

I think I need to get me one of these blower thingys!!

Don't we all.

Some SC setups don't even have a bypass valve if they are only running about 6 psi and below. I'm not sure about the Dinan kit, but It might not have one.