Active Exhaust's

[rev-erend]

Anyone know if the systems used by :

Aston Martin
Porsche

Are truely active ..

i.e Negative sound wave to cancel exhaust pulse..

or whether they just use a good old flap valve like a pair of throttle control valves..

The sound made by the Aston V8 is just unbelieve able but it;s nice and quite around town .. (fuse 22)..

[350Matt]

its just noise control chap ( pair of bypass valves to striaght through pipes), to pass the drive by noise regs

Matt

[rev-erend]

350Matt said:

its just noise control chap ( pair of bypass valves to striaght through pipes), to pass the drive by noise regs

Matt

I though that would be the case

You would think someone would do them for mis-selling .. or something.

Anyone know if anyone makes an after market system yet .. it seems to be an easy and desirable bit of kit to put in a custom built silencer.

An mate with a Porsche said it's a £1500 option FYI.

[grahambell]

rev-erend said:

Anyone know if anyone makes an after market system yet .. it seems to be an easy and desirable bit of kit to put in a custom built silencer.

Custom Chrome in Nuneaton were looking into it around the start of the year, though don't know how/if things have progressed.

[eliot]

rev-erend said:

Anyone know if anyone makes an after market system yet .. it seems to be an easy and desirable bit of kit to put in a custom built silencer.

What the the valve thingy?

http://www.google.co.uk/search?hl=en&q=electri...

[rev-erend]

eliot said:

rev-erend said:

Anyone know if anyone makes an after market system yet .. it seems to be an easy and desirable bit of kit to put in a custom built silencer.

What the the valve thingy?

http://www.google.co.uk/search?hl=en&q=electri...

I have an American Jegs catalogue and they have sever like this - really designed to just save you the bother of having to un-bolt an exhaust system at the strip to run open headers..

[rev-erend]

grahambell said:

rev-erend said:

Anyone know if anyone makes an after market system yet .. it seems to be an easy and desirable bit of kit to put in a custom built silencer.

Custom Chrome in Nuneaton were looking into it around the start of the year, though don't know how/if things have progressed.

I'll give they a call on Monday.

[sharky55]

Yamaha EX-up valve. improves low end torque without affecting high end revs. Why no car companys haven't tried this i don't know!

[rev-erend]

Well - Yamaha must have had a patent on it .. but it must have expired because others not have them (Suzuki) etc..

I don't think cars go for the very high revs (except Honda VTEC ) and that VTEC is it's own way of improving the midrange.

In short - no need for it.

[Chassis 33]

eliot said:

rev-erend said:

Anyone know if anyone makes an after market system yet .. it seems to be an easy and desirable bit of kit to put in a custom built silencer.

What the the valve thingy?

http://www.google.co.uk/search?hl=en&q=electri...

Why is it that the silenced system has to take the folk? Surely if you want a true straight through system you want the minimum disruption to the gas flow possible?

Regards
Iain

[BOFFIN]

AET Turbos in West Yorkshire have an active exhaust system available which may interest you guys. It has three modes one of which is active the other two are pre-determined I think, thereby allowing the exhaust characteristics to be changed.

Here's the link:

http://www.aetturbosonline.com/catalog/active-exha...

[rev-erend]

Interesting.. but a bit pricey..

[BOFFIN]

Yeh,

AET Turbos are able to offer the units to "forum customers" for £350+VAT, just mention this thread if you call AET and they will honour this discount.