BOV on a supercharger

Blackcoog · 07-31-2007, 10:07 AM

Anyone ever heard a BOV on a supercharger? You'd only see this on a blow through setup and you'd only run a blow through setup if you had issues moving the MAF before the supercharger. Since I'm running a blow through setup I have a BOV.

Normally on a turboed car you hear it release pressure for a split second when you let off the throttle. On mine it dumps pressure at the same time but since it's a supercharger and it's being run off the belt the supercharger continues to pump so unless you are under 2k rpms it continues to hiss the entire time if you continue to decelerate without putting the clutch in. It's kind of neat but also kind of annoying if you want to drive it daily and stay someone unnoticed. My wife said it sounds like a snake.

I think the sound is amplified because it's in the fender well area behind the bumper. I may pickup a bypass and run a tube down under the car so I can't hear it as well. For reference I have an Apexi dual chamber BOV.

ModCougar · 07-31-2007, 11:09 AM

Hmmm...that's pretty cool. I bet it would get annoying though.

PREDATOR · 07-31-2007, 11:20 AM

Hmm... weird

I know what you're talking about but I've never seen anything like that before.

FastCougar · 07-31-2007, 11:25 AM

Why not go with a recirculating valve? Sure, you don't get that moster BOV sound when you shift, but it would be even more of a sleeper then and it's daily driving delight.

cvsmightymouse24 · 07-31-2007, 01:56 PM

Yeah i agree with trevor.....running 100% atmosphere is annoying and gets old after awhile. Put a recycling tube on and the sound will be decreased by a lot!!!

Blackcoog · 07-31-2007, 02:07 PM

I don't think you understand...there is no place to recycle the air to. Reference the pictures on my site: 3L Duratec

The air should be recycled after the filter before the supercharger, but the filter is bolted to the supercharger so that isn't an option.

FastCougar · 07-31-2007, 02:28 PM

Quote:

Originally Posted by Blackcoog

I don't think you understand...there is no place to recycle the air to. Reference the pictures on my site: 3L Duratec

The air should be recycled after the filter before the supercharger, but the filter is bolted to the supercharger so that isn't an option.

You know, I was thinking that right after my reply. Why not divert it, like a waste gate setup and run some tubing down behind the engine and out the back of the car. At least that way, the sound won't be right under the hood. The majority of the noise from a BOV comes from the shape of the exiting orifice. Relocating this orifice much farther back with some tubing will dissipate the sound considerably. Not to mention, what sound is generated is now being exhaled somewhere than in front of the driver, so it will be much less noticeable.

Clutch · 07-31-2007, 04:58 PM

This isn't related but reminded me. You can now run a wastegate on a supercharger. A magazine i subscribe to had a guy cog his supercharger for 20 something pounds and put a wastegate on the supercharger to limit the air being compressed, he reached peak hp and tq faster because the supercharger was spinning faster from the start but then doesn't rise until you adjust your wastegate/boost controller.

Dom1013 · 07-31-2007, 05:10 PM

Quote:

Originally Posted by Blackcoog

since it's a supercharger and it's being run off the belt the supercharger continues to pump

...I wouldn't see a turbocharger being any different, don't think the compressor on it stops spinning completely in between shifts either...im sure it keeps moving air also, should react the same logically when u let off the throttle

but I'm sure there's gonna be some difference in the two. Second, I love the sound of boost and anything related to it, it will never get annoying to me, and if it does my system could always drown it out...

AndyMan · 07-31-2007, 09:55 PM

.....

... i want this right now

07-31-2007, 10:07 AM	#1 (permalink)
Blackcoog 3L Install Maestro Join Date: Oct 2000 Location: Minneapolis, MN Posts: 4,606	BOV on a supercharger Anyone ever heard a BOV on a supercharger? You'd only see this on a blow through setup and you'd only run a blow through setup if you had issues moving the MAF before the supercharger. Since I'm running a blow through setup I have a BOV. Normally on a turboed car you hear it release pressure for a split second when you let off the throttle. On mine it dumps pressure at the same time but since it's a supercharger and it's being run off the belt the supercharger continues to pump so unless you are under 2k rpms it continues to hiss the entire time if you continue to decelerate without putting the clutch in. It's kind of neat but also kind of annoying if you want to drive it daily and stay someone unnoticed. My wife said it sounds like a snake. I think the sound is amplified because it's in the fender well area behind the bumper. I may pickup a bypass and run a tube down under the car so I can't hear it as well. For reference I have an Apexi dual chamber BOV. __________________ Current Rides 1999 MTX Cougar, 3L Supercharged 325hp and 278tq 1999 SVT Contour, Ported 3L Visit: http://www.3lduratec.com For info on ready to drop in 3L's and our supercharger kit.

07-31-2007, 11:09 AM	#2 (permalink)
ModCougar Was that sposed 2 happen? Join Date: Jan 2007 Location: Indiana Posts: 813	Re: BOV on a supercharger Hmmm...that's pretty cool. I bet it would get annoying though. __________________ - WTB: front struts, springs/coilovers, 19mm rear sway bar, inner/outer tie rod ends - headers, and black or gunmetal gray wheels - Roush floormats, wheels, pedals, and spoiler - For Sale: '99 Headlights - Kaminari Wing - Stock Throttle Body - IACV - Misc. stock engine parts - 1999 Mercury Cougar V6 MTX - Kaminari/Roush/SVT

07-31-2007, 11:20 AM	#3 (permalink)
PREDATOR PLATINUM M0DERAT0R Join Date: Oct 2003 Location: SURPRISE! Posts: 5,426 Blog Entries: 1	Re: BOV on a supercharger Hmm... weird I know what you're talking about but I've never seen anything like that before. __________________ Add me to your friends list on MySpace PLATINUM FOR LIFE

07-31-2007, 11:25 AM	#4 (permalink)
FastCougar In search of more boost! Join Date: Nov 1999 Location: Kearneysville, WV Posts: 8,507 Images: 743	Re: BOV on a supercharger Why not go with a recirculating valve? Sure, you don't get that moster BOV sound when you shift, but it would be even more of a sleeper then and it's daily driving delight. __________________ 1999 Mercury Cougar - Turbo'd 3L. Status: Parting out car: Engine for Sale \| Trans for Sale Power: 391.9 hp @ 6750 rpm \| 374.2 lbs/ft. @ 4250 rpm \| boost @ 11 psi For Sale: 19" Konig Verdicts with Toyo ProxesFZ4 225/35ZR19 Tires - $700 shipped!

07-31-2007, 01:56 PM	#5 (permalink)
cvsmightymouse24 NECO Member Join Date: Jul 2004 Location: Mechanicsburg Posts: 772	Re: BOV on a supercharger Yeah i agree with trevor.....running 100% atmosphere is annoying and gets old after awhile. Put a recycling tube on and the sound will be decreased by a lot!!! __________________ "I don't want a large Farva, I want a fricken liter of cola!!"

07-31-2007, 02:07 PM	#6 (permalink)
Blackcoog 3L Install Maestro Join Date: Oct 2000 Location: Minneapolis, MN Posts: 4,606	Re: BOV on a supercharger I don't think you understand...there is no place to recycle the air to. Reference the pictures on my site: 3L Duratec The air should be recycled after the filter before the supercharger, but the filter is bolted to the supercharger so that isn't an option. __________________ Current Rides 1999 MTX Cougar, 3L Supercharged 325hp and 278tq 1999 SVT Contour, Ported 3L Visit: http://www.3lduratec.com For info on ready to drop in 3L's and our supercharger kit.

07-31-2007, 04:58 PM	#8 (permalink)
Clutch NECO Member Join Date: Jan 2002 Location: Belmont NC. Posts: 3,109	Re: BOV on a supercharger This isn't related but reminded me. You can now run a wastegate on a supercharger. A magazine i subscribe to had a guy cog his supercharger for 20 something pounds and put a wastegate on the supercharger to limit the air being compressed, he reached peak hp and tq faster because the supercharger was spinning faster from the start but then doesn't rise until you adjust your wastegate/boost controller. __________________ "you suck at photoshop" In memory of Donnie hoyle, gone but not forgotten. OMG i'm such an internet Douche

07-31-2007, 09:55 PM	#10 (permalink)
AndyMan NECO Member Join Date: Dec 2005 Location: Fayetteville, NC Posts: 1,302	Re: BOV on a supercharger ..... ... i want this right now __________________

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