Virtual Exhaust Valve

[l jones]

Spoke To Mike At Impossibe About The New Apt Exhaust Valve. It Fits Into Your Exhaust Before The Cat. Its Boost Actuated, So At Idle And Cruising The Vehicle Is Quiet, As The Valve Is Shut And Gases Travel Along The Normal Exhaust Route. At Full Chat The Valve Opens And The Majority Of Exhaust Gases Are Vented Straight Out To The Floor. So Basically You Can Keep The Factory Fit 2" Exhaust And Have A Mega 3" Decat At Full Throttle. Price Is

[tavia4x4]

interesting.... I like the idea, and on forced induction we shouldn't need any backpressure, should we?

Discuss

[redbaron]

hmm could i fit 2 to a v8?

[l jones]

According To Mike, The Valve Is Good For Knocking Half A Second Off Your Quarter Mile Times As Well.

[l jones]

YOU CAN READ ALL ABOUT THIS VALVE ON WWW.ATPTURBO.COM. THERE'S A VIDEO/SOUND CLIP YOU CAN DOWNLOAD AS WELL. SOUNDS TOP.

[Joel_vRS]

wow sounds ideal and totaly affordable, how about when revved stationary? just thikning of MOT testing ?? no fumes at back if vavlve opens...

would it work with standard boost ??

Also Is It Not Annoying Trying To Type With A Capital At The Start Of Every Word

Joel

[l jones]

The Valve Is Operatetd By An Actuator, Which Is T'd Into The Turbo. It Opens At About 5 Lbs Boost, So At Idle And Normal Use The Valve Is Shut.

[Joel_vRS]

The Valve Is Operatetd By An Actuator, Which Is T'd Into The Turbo. It Opens At About 5 Lbs Boost, So At Idle And Normal Use The Valve Is Shut.

still a bit green when it comes to understanding boost...woudl a stock turbo open it ? dunno if it goes up to 5 lol

Joel

[DaveU]

This is very similar to what Aston Martin do in their exhausts - although obviously nothing to do with a turbo

[tavia4x4]

..maybe instead \ as well fit a switch to force it open \ force it closed no matter what?

[tavia4x4]

Hmmm.. looking the dyno I'd say we need some back pressure, as it's generating less power low down, or it's opening too early? Great on a 1/4 mile where you redline every gear, but not great for response.

May be a slight advantage for FWD cars tho, less power low down but more once rolling.

[Nigel26]

wonder if thats why the DB9 sounds like the exhausts have fallen off when you nail it !?

sounds like a cheap fix to adding alittle more performance to the car...

[SkodiRS]

Has Ferrari got something similar on the 360 but this is purely to pass sound regs.

Also sounds like something from an old Yamaha motorbike.....valve in exhaust opens to give better performance...."power valve"?

[faboka vrs]

This does sound interesting. I assume it would work with all charged cars But the idea of black smoke under the car :eek:

[Chavyboy]

Has Ferrari got something similar on the 360 but this is purely to pass sound regs.

Also sounds like something from an old Yamaha motorbike.....valve in exhaust opens to give better performance...."power valve"?

Power valves where used on the 2 stroke bikes to tune the exhaust port' date=' on the big 4 strokes it was called the EXUP unit (EXhaust Ultimate Powervalve) again it did the same thing and tuned the back pressure.

interesting.... I like the idea, and on forced induction we shouldn't need any backpressure, should we ?

Discuss

Tavia - No turbos don't need any back pressure, best to come straight out the turbo with no exhaust but alais sound regs are an issue and the whopping great flame that you might get out as well might have some bearing on this That's why petrol turbo cars see a big improvement with a decat.

[faboka vrs]

and the whopping great flame that you might get out as well might have some bearing on this That's why petrol turbo cars see a big improvement with a decat.

Flame under the car. Why didn't I buy a petrol again......oh that was it insurance :thumbdwn: and MPG

[tavia4x4]

Tavia - No turbos don't need any back pressure' date=' best to come straight out the turbo with no exhaust but alais sound regs are an issue and the whopping great flame that you might get out as well might have some bearing on this That's why petrol turbo cars see a big improvement with a decat.[/quote']

Ok, thats what I believed, that the turbo itself created enough backpressure, however, can you explain why with it open the dyno shows less power lower down, exactly what I would expect on an NA engine....

(The jury is still out )

[Chavyboy]

Ok' date=' thats what I believed, that the turbo itself created enough backpressure, [b']however, can you explain why with it open the dyno shows less power lower down, exactly what I would expect on an NA engine....[/b]

(The jury is still out )

Sorry T I seem to be having a blonde day today this means ?

No Offence to blondes

[tavia4x4]

Have you looked at the dynograph on the site that sells the exhaust valve?

The run with it open shows more power higher up, but actually less than closed up until about 5250... maybe it's not setup correctly and needs to stay closed for longer...

[redbaron]

i think the rpm at which it opens and closes would be throttle dependent almost needing a map of its own.. kind of like fifth injector/ water injection system to fully utilise...

[Chavyboy]

Sorry no Ian I haven't looked.

We are looking at the same graph or I am over looking something but with the cut out open (Bue lines) about 90% of the time it makes more bhp/torque. :confused:

[Joel_vRS]

do you have any conatct details for Mike at Impossible ?

i'll like to disscuss it with them..

Ta

joel

[tavia4x4]

Sorry no Ian I haven't looked.

We are looking at the same graph or I am over looking something but with the cut out open (Bue lines) about 90% of the time it makes more bhp/torque. :confused:

at first glance figured the "pairs" were torque and bhp for each run... not one pair bhp and one pair torque....

[Chavyboy]

at first glance figured the "pairs" were torque and bhp for each run... not one pair bhp and one pair torque....

So'k I had to have a second look

[Quinten]

do you have any conatct details for Mike at Impossible ?

i'll like to disscuss it with them..

Ta

joel

http://www.impossible-performance.cwc.net/