Boost Activated Virtual Exhaust System

Instead of buying a catback exhaust, would something like this prove benificial for the stock exhaust? Similar to the WMS exhaust, this valve would dump the exhaust before the resonator/muffler when on boost.

Here is a photoshop mockup of what it might look like.


Joe

 

But isn't that for turbo's?...unless ur MINI or Mini is turbo.

 

Interesting idea.

 

Doesn't a turbo need back pressure to function properly? How would dumping the exhaust keep back pressure up :-\. It's certainly possible, but if you're asking about cost, I can't see how it could be any cheaper than a normal exhaust

 

"A system that works “on demand” at the onset of boost on turbo and supercharged vehicles to free up all the backpressure (just as a large exhaust system would) in the exhaust stream so the engine can make maximum power. The VES system works as an active dump tube that completely bypasses the restrictive exhaust system when boost is present."

 

I think your refering to the exhaust pressure before the turbo. This valve is after it.

Valve - $139
Actuator - $79
And then whatever style pipe to splice into the exhaust - ~$49

 

You're probably right, my knowledge of turbos is very limited, I just remember turbo + no back pressure = not much... lol)

He'd also need some sort of switch in the cabin unless this is a system that activates automatically upon exhaust pressure building up or something. And someone to install all of it (Cause i'm too lazy to work on my own car )

 

We made a similar system! The valve is closed under vacuum and open under boost. It works but is loud and very expensive.
Many cars have it or are coming out with it. It mainly concerns mileage.

 

What do you mean by "It mainly concerns mileage"?
If it's very expensive, why is ATP's so cheap?

 

It works off of boost pressure not exhaust pressure. If you wanted full controll you could connect it to an electronic boost controller to specify when it opens...or turn it off all-together.

I hear you on the install part.

 

I'm sure it sounds nifty under wide open throttle, but besides being deafening, the complexity of the system would concern me. I'm good with one-ball + OBX

 

I don't know who ATP is but the parts alone cost hundreds. (The vacuum solenoid isn't cheap.)
You can buy an electronically controlled dump valve from DMH Performance for around $150.
The valves help with gas mileage and are being incorporated on the Corvette, Infinity M45, Audi TT 3.2, Volks R32, BMW Ms, and on and on...

 

ATP

Referred to in the 1st post. Thanks for your responses.

 

Interesting idea, but at least for us in Cali is totally illegal. Unless you use your car "for track only"

 

With a boost controller, the valve could remain closed for every day driving and opend for track days.

Section 27151 of the Vehicle Code:

(a) No person shall modify the exhaust system of a motor vehicle in a manner which will amplify or increase the noise emitted by the motor of the vehicle so that the vehicle is not in compliance with the provisions of Section 27150 or exceeds the noise limits established for the type of vehicle in Article 2.5 (commencing with Section 27200). No person shall operate a motor vehicle with an exhaust system so modified.
(b) For the purposes of exhaust systems installed on motor vehicles with a manufacturer's gross vehicle weight rating of less than 6,000 pounds, other than motorcycles, a sound level of 95 dbA or less, when tested in accordance with Society of Automotive Engineers Standard J1169 May 1998, complies with this section. Motor vehicle exhaust systems or parts thereof include, but are not limited to, nonoriginal exhaust equipment.

 

Actually your wrong... The last thing you want on a Turbo car is backpressure. You want pretty much as free flowing of an exhaust as you can get. Hence why people run 3"-5" exhaust piping with NO cats, resonators, or mufflers. Depending on the size of the turbo obviously...

WMS proved that the cutout idea works with their exhaust. I've been toying with the idea of incorporating this into either the stock exhaust or whatever aftermarket exhaust I decide to use. I'm sure it would yield a good amount of hp AND tq.

I think it would be better if it was just user-controlled. Look up QTP (QuickTime Performance) they have cutouts made in different sizes and all that is needed is for it to be put inline with the exhaust...
www.quicktimeperformance.com

 

Ok, but I will do you one better:

California Vehicle Code 27150

(a) Every motor vehicle subject to registration shall at all times be equipped with an adequate muffler in constant operation and properly maintained to prevent any excessive or unusual noise, and no muffler or exhaust system shall be equipped with a cutout, bypass, or similar device.

27150(b) Except as provided in Division 16.5 (commencing with Section 38000) with respect to off-highway motor vehicles subject to identification, every passenger vehicle operated off the highways shall at all times be equipped with an adequate muffler in constant operation and properly maintained so as to meet the requirements of Article 2.5 (commencing with Section 27200), and no muffler or exhaust system shall be equipped with a cutout, bypass, or similar device.

I would have done it by now if it was legal.

 

Touché

 

Gotta love Kalifornya.

 

Yep, "cutout" is what street racers used to call it in the fifties and sixties. It used to be a manually-operated valve located somewhere between the header and the first muffler (this is before catalytic converters). They were illegal back then too.

 

i thought you needed to design an exhaust system with mufflers designed to help scavenging... just letting all that exhaust out might not be the best idea?

 

Doesn't the JCW CAI use a vacuum solenoid for the flap?