Supercharger BOV - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

AiRDawG · 06-22-2012, 08:57 AM

Hey guys, NA driver here.

Just recently I heard a blown Camaro "woosh" by me, and I'm wanting to know what the general consensus is on SC blow off valves. I can't seem to find much information on the subject, but I want to know if it's of any value other than attention-getting.

EDIT: I know what the Bypass/BOV DOES, so obviously it's crucial for FI operation, I'm talking strictly about the SOUND.

*GTAHVIT* · 06-22-2012, 09:03 AM

Supercharged or turbo charged.

Superchargers have a bypass valve that allows air to bypass the compressor under normal driving conditions. The bypass valves don't make noise that I know of.

Turbos have the BOV and it is essential to bleed off unused air/pressure. but the not all BOV's make a lot of noise unless you want them to.

camslambam · 06-22-2012, 09:22 AM

Superchargers whine.
Turbos blow off.

AiRDawG · 06-22-2012, 09:31 AM

This car was absolutely supercharged, and it absolutely had a prolonged "whooshing" sound. It wasn't the quick "FFFSSSSHHHH" of a turbo's BOV, this was a longer whoosh as he was letting off the throttle.

I guess an aggressive bypass is what makes the sound, like GTAHVIT said.:

The second one is most like the sound that I heard, and it was clearly audible even over my LT's with cleared cats and catback...

S3XPanther · 06-22-2012, 10:42 AM

Probably a centri with a blow off.

*GTAHVIT* · 06-22-2012, 11:38 AM

Quote:

Originally Posted by S3XPanther

Probably a centri with a blow off.

Never thought of that...

I was thinking top mount like my maggie.

camslambam · 06-22-2012, 11:39 AM

There some centris with BOV and boost controllers.

Detoxx03 · 06-22-2012, 01:17 PM

SC2150 · 06-22-2012, 03:11 PM

If you did not have a blow-off valve (properly sized) on a turbo or front mount centri SC when you let off the throttle the TB blade would bend around the shaft and/or the IM blow apart from the pressure.

GTAHVT has it 100% correct on atop mount SC as it is downstream of the TBand recirculates internally.

GaBoy25 · 06-22-2012, 04:23 PM

Those girls screaming was money!!!! Too bad no back seats in a vette.

AiRDawG · 06-22-2012, 04:33 PM

I think I worded my initial post poorly.

What I'm really wondering is what you FI folks think about the "blow off sound" on a supercharger. Is there any reason to get a different bypass valve for a SC, other than to make more noise? Or is the "whoosh" just lame-o?

Detoxx03 · 06-22-2012, 05:00 PM

I love it. The last video I posted is of mine.

SC2150 · 06-22-2012, 05:55 PM

Quote:

Originally Posted by AiRDawG

I think I worded my initial post poorly.

What I'm really wondering is what you FI folks think about the "blow off sound" on a supercharger. Is there any reason to get a different bypass valve for a SC, other than to make more noise? Or is the "whoosh" just lame-o?

Some get the type with a "horn" outlet to make it louder....but usually rice only.

If you dont care for the sound you could try to muffle it with a foam covering as long as you dont restrict the pressure relief flow.

Only a top mount (maggie/KB/Whipple) have an internal bypass valve and it doesn't make the "whoosh" your talking about. Only a FI system that pressurizes the intake manifold and piping pre-throttle body need a blow-off valve.

Still not sure what your asking....if you want the whoosh sound there are speaker kits on Ebay that you push a button and make a recorded whoosh, but that would be beyond rice for sure and you would most likely be laughed off the site.

Kronix · 06-22-2012, 07:59 PM

Quote:

Originally Posted by SC2150

Still not sure what your asking....if you want the whoosh sound there are speaker kits on Ebay that you push a button and make a recorded whoosh, but that would be beyond rice for sure and you would most likely be laughed off the site.

GaBoy25 · 06-22-2012, 09:29 PM

Quote:

Originally Posted by SC2150

Some get the type with a "horn" outlet to make it louder....but usually rice only.

If you dont care for the sound you could try to muffle it with a foam covering as long as you dont restrict the pressure relief flow.

Only a top mount (maggie/KB/Whipple) have an internal bypass valve and it doesn't make the "whoosh" your talking about. Only a FI system that pressurizes the intake manifold and piping pre-throttle body need a blow-off valve.

Still not sure what your asking....if you want the whoosh sound there are speaker kits on Ebay that you push a button and make a recorded whoosh, but that would be beyond rice for sure and you would most likely be laughed off the site.

AiRDawG · 06-23-2012, 12:00 AM

haha see that's what I'm asking! I'd never heard an SC make any noise other than that sweet, sweet whine. Wanted to know what you guys that actually run FI think.

So I've decided that the ebay speaker idea is a winner, I'm going to up badge my SS to Z28 and put a big "TURBO" vinyl across the windshield, and a "SUPERCHARGED" sticker for the back window. Maybe I'll stop by wal-mart and grab a handle off one of the shopping carts too.

SC2150 · 06-23-2012, 10:56 AM

I am still confused.......there are 2 types of superchargers on the Gem 5 camaros, the roots type top mount that makes no "whoosh" noise as it is not pressurizing the IM...it replaces the IM so the bypass valve is internal.

Then the front mount Centrifical SC's that do pressurize the IM and w/out a blow-off valve would destroy the TB and/or the IM the first time you release the throttle when in boost.........so what are you asking? Ihave laid out all in detail, yet you still seem confused...what part needs clairification?

AiRDawG · 06-23-2012, 04:53 PM

Quote:

Originally Posted by SC2150

you still seem confused...what part needs clairification?

No. Not confused.

I wanted opinions on what people think about that sound, and if a bypass valve that makes more noise added any benefit apart from more noise. (I'm aware that the bypass valve is a critical component in a centri setup, I'm not talking about bypassing the excess pressure, I'm talking about the noise.) My friend with a blown cobalt said he thought the sound was rice-y. Detox loves the sound. And all indications are that having a bypass valve that's loud has no benefit over a quiet one. That's all the information I wanted, and I got a good sample of opinions. Thanks guys!

solobaric · 06-23-2012, 05:41 PM

I love it.

Nice land-shark detoxx!!

Detoxx03 · 06-23-2012, 05:57 PM

Thanks guys. It all a matter of preference. I'm not big into the whine or pd blowers personally but other people love them. My BOV is pretty quiet and I've been considering getting the Big Red Procharger BOV or a Tial cause I have the standard one now. My friends TT 5th gen Camaro has a Tial and I love the way it sounds.

solobaric · 06-23-2012, 09:55 PM

Which tial is that in the second vid detoxx?

BLACK10 · 06-23-2012, 10:53 PM

we pretty much use all the loud bov's with the ECS centri kits we install. cant beat the sound!

flyby · 06-24-2012, 06:57 AM

I believe the answer to your question was missed. The blow off valve is essential when a supercharger or turbo is used. On hard (ish) acceleration the system is pressurized (which could be up-wards of 30psi), when the gas pedal is let off there has to be somewhere for the excess, and unneeded pressure to go hence the blow off valve. If there were no blow off valve much damage would be done to the engine since there is no place for the excess air to go.

06-22-2012, 08:57 AM	#1
AiRDawG Drives: 2011 Camaro 2SS Join Date: May 2011 Location: Maryland Posts: 221 View My Garage	Supercharger BOV Hey guys, NA driver here. Just recently I heard a blown Camaro "woosh" by me, and I'm wanting to know what the general consensus is on SC blow off valves. I can't seem to find much information on the subject, but I want to know if it's of any value other than attention-getting. EDIT: I know what the Bypass/BOV DOES, so obviously it's crucial for FI operation, I'm talking strictly about the SOUND. Last edited by AiRDawG; 06-25-2012 at 11:48 AM.

06-22-2012, 09:03 AM	#2
GTAHVIT One Lucky Guy. Drives: #22 Tom Henry Racing 2010 2SS/RS Join Date: Dec 2007 Location: Saint Augustine FL Posts: 28,399 View My Garage	Supercharged or turbo charged. Superchargers have a bypass valve that allows air to bypass the compressor under normal driving conditions. The bypass valves don't make noise that I know of. Turbos have the BOV and it is essential to bleed off unused air/pressure. but the not all BOV's make a lot of noise unless you want them to. __________________ Click image to see build thread. PQ - "the love of cars. It's a boys first step toward manhood and a mans last hold on boyhood." Fbodfather - "We do not want to use the Z28 moniker on a car that does not deserve this hallowed name." The_Blur - "Let's not confuse competitors with equals."

06-22-2012, 10:42 AM	#5
S3XPanther by Odeon Drives: '12 SS/RS L99 IOM, '13 1LE soon! Join Date: Nov 2011 Location: Good question Posts: 1,254	Probably a centri with a blow off. __________________ "It works 60% of the time, 100% of the time." "Some say it's a waste of time, others say it's an incredible waste of time." "The ultimate measure of a man is not where he stands in moments of comfort and convenience, but where he stands at times of challenge and controversy." 2013 IOM SS/RS - 1LE born 5/6/2013

06-22-2012, 05:00 PM	#12
Detoxx03 Futral Motorsports Beast Drives: 2008 Corvette Join Date: Oct 2010 Location: Louisiana Posts: 556 View My Garage	I love it. The last video I posted is of mine. __________________ D1SC Procharger 700/602 8PSI A Futral Motorsports Creation www.calloutsnola.com

06-23-2012, 05:57 PM	#20
Detoxx03 Futral Motorsports Beast Drives: 2008 Corvette Join Date: Oct 2010 Location: Louisiana Posts: 556 View My Garage	Thanks guys. It all a matter of preference. I'm not big into the whine or pd blowers personally but other people love them. My BOV is pretty quiet and I've been considering getting the Big Red Procharger BOV or a Tial cause I have the standard one now. My friends TT 5th gen Camaro has a Tial and I love the way it sounds. __________________ D1SC Procharger 700/602 8PSI A Futral Motorsports Creation www.calloutsnola.com

06-22-2012, 09:22 AM	#3
camslambam Account Suspended Drives: 2010 SS, 06 SRT10 Ram Join Date: Nov 2011 Location: C. America Posts: 1,668	Superchargers whine. Turbos blow off.

06-22-2012, 11:39 AM	#7
camslambam Account Suspended Drives: 2010 SS, 06 SRT10 Ram Join Date: Nov 2011 Location: C. America Posts: 1,668	There some centris with BOV and boost controllers.

06-22-2012, 03:11 PM	#9
SC2150 Account Suspended Drives: 2012 Camaro RS, RX supercharged Join Date: Dec 2009 Location: Bradenton, FL Posts: 8,375	If you did not have a blow-off valve (properly sized) on a turbo or front mount centri SC when you let off the throttle the TB blade would bend around the shaft and/or the IM blow apart from the pressure. GTAHVT has it 100% correct on atop mount SC as it is downstream of the TBand recirculates internally.

06-22-2012, 04:33 PM	#11
AiRDawG Drives: 2011 Camaro 2SS Join Date: May 2011 Location: Maryland Posts: 221 View My Garage	I think I worded my initial post poorly. What I'm really wondering is what you FI folks think about the "blow off sound" on a supercharger. Is there any reason to get a different bypass valve for a SC, other than to make more noise? Or is the "whoosh" just lame-o?

06-23-2012, 12:00 AM	#16
AiRDawG Drives: 2011 Camaro 2SS Join Date: May 2011 Location: Maryland Posts: 221 View My Garage	haha see that's what I'm asking! I'd never heard an SC make any noise other than that sweet, sweet whine. Wanted to know what you guys that actually run FI think. So I've decided that the ebay speaker idea is a winner, I'm going to up badge my SS to Z28 and put a big "TURBO" vinyl across the windshield, and a "SUPERCHARGED" sticker for the back window. Maybe I'll stop by wal-mart and grab a handle off one of the shopping carts too.

06-23-2012, 10:56 AM	#17
SC2150 Account Suspended Drives: 2012 Camaro RS, RX supercharged Join Date: Dec 2009 Location: Bradenton, FL Posts: 8,375	I am still confused.......there are 2 types of superchargers on the Gem 5 camaros, the roots type top mount that makes no "whoosh" noise as it is not pressurizing the IM...it replaces the IM so the bypass valve is internal. Then the front mount Centrifical SC's that do pressurize the IM and w/out a blow-off valve would destroy the TB and/or the IM the first time you release the throttle when in boost.........so what are you asking? Ihave laid out all in detail, yet you still seem confused...what part needs clairification?

06-23-2012, 05:41 PM	#19
solobaric Drives: 2002 Camaro SS Join Date: Jun 2012 Location: Henderson, KY Posts: 69	I love it. Nice land-shark detoxx!!

06-23-2012, 09:55 PM	#21
solobaric Drives: 2002 Camaro SS Join Date: Jun 2012 Location: Henderson, KY Posts: 69	Which tial is that in the second vid detoxx?

06-23-2012, 10:53 PM	#22
BLACK10 POWER TECH Drives: 2010 CAMARO. 10.04@133mph, 1.4 60' Join Date: Jul 2009 Location: Lafayette, Louisiana Posts: 4,429	we pretty much use all the loud bov's with the ECS centri kits we install. cant beat the sound! __________________ LETHAL RACING.COM 337-258-7692 2010 CAMARO 10.04@133mph,1.4 60'on stock bottom end

06-24-2012, 06:57 AM	#23
flyby Drives: 2010 Silver SS Join Date: Sep 2009 Location: Glen Gardner, NJ Posts: 1,307 View My Garage	I believe the answer to your question was missed. The blow off valve is essential when a supercharger or turbo is used. On hard (ish) acceleration the system is pressurized (which could be up-wards of 30psi), when the gas pedal is let off there has to be somewhere for the excess, and unneeded pressure to go hence the blow off valve. If there were no blow off valve much damage would be done to the engine since there is no place for the excess air to go.