Exhaust bypass (return of vivs smart car!)

[arc]

Remeber the rolling smart car? Though i'd post up the latest mod to it, as i know at least some of you might be interested!

It has a 3" Exhaust bypass valve fitted.

Been out in the car tonight - got some photos and videos.

Basically, what the bypass does is when the car is on above around 1bar of boost, it opens a valve in the exhaust and dumps the waste gas straight to atmosphere via a 3" pipe. It negates using these pesky silencers and other restrictions.

Photos:

and some videos of it in action:

http://tackycheese.net/cars/smart/bypass/driving_away.avi

http://tackycheese.net/cars/smart/bypass/driving_back.avi

http://tackycheese.net/cars/smart/bypass/progress_way.avi

http://tackycheese.net/cars/smart/bypass/walkabout_end.avi

For more info on the valve, have a look here:

http://www.atpturbo.com/root/releases/release091004.htm

 

[Trancendental]

Does it work well though? Does it work at all?

 

[arc]

why wouldnt it work?

but yeah, works great. need to rolling road the car though to check the differences it makes. but the turbo spools up quicker

 

[Trancendental]

You know... sometimes things just dont work as expected... or they work but the difference is so minor you might as well not have bothered

Not that it would bother me but isn't this a tad bit illegal? be like having a straight through pipe.

 

[arc]

erm, yeah.. maybe.. but people drive around with straight through systems - this one only kicks when the turbo is boosting high - so not like its open all the time. it can be easily disabled too

 

[Trancendental]

I know Straight thrus benefit all cars... would this one benefit a none turbo too?

like can you press a button to just open it at will then close it when your done?

(I'm gettin all excited )

 

[arc]

no, it wouldnt benefit an N/A car. an N/A car needs a properly designed system to help get shut of exhaust gasses. on a turbo car, after the turbo you just need to get rid of the gasses, you don't need to concern yourself with pressures and proper design.. just need as little restriction as possible. on a turbo car, the exhaust manifold is very important, but after that - phat pipe is fine.

also this particular valve wouldn't work on an N/A car anyways, its opened when the boost produced by the turbo reaches 1bar.. and N/A car wouldnt build boost! sorry!

 

[Trancendental]

(Is no longer excited)

 

[stilosporting]

what about on a turbo diesel???

 

[Hellcat]

Driven a TD with a straight through exhaust about 250 miles... The pipe sheared right after the flexible and mr AA couldn't fix it. Still got the usual power and ecconomy but with the sound of some American V8 muscle car! Felt upset when I fitted the new front pipe

 

[scottc1088]

imo its just a cheap version of a external wastegate lol
also it would work on a n/a car aslong as you found a way of opening and closing the valve but there wouldnt be that much improvement and will just sond like your exhaust is blowing

 

[arc]

well.. erm.. no.

a wastegate diverts exhaust gate round the turbo once its generated enough boost.. this does nothing of the sort - the car already has an electronic wastegate to control boost.

working on an N/A.. depends what you class as working i guess, could you get it to vent gasses to atmosphere? yes. is there any point? no.

 

[stilosporting]

Still got the usual power and ecconomy but with the sound of some American V8 muscle car!

that sounds good to me lol! just wait til the warranty runs out

 

[Fast Finger]

Those clips that were posted.
Are they just audio or vid aswell, as i just get audio?

EDIT- I thinks its the codecs, how do i go about putting this right?
*puts on dunces cap*

 

[Trancendental]

The vids were taken in the dead of night so you might need to adjust your brightness...

Theres not much to see anyways.

 

[arc]

it was encoded in divx 5, as long as u have that they should play back ok

 

[Fast Finger]

Erm...dont know if i have it. How do i check/get it?

 

[arc]

http://www.divx-digest.com/software/divxcodec5.html

 

[Hellcat]

Video Lan.. It will play it.

http://www.videolan.org/vlc/download-windows.html

 

[arc]

not without the corrrect codec it won't.

anything will play it once you have the codec installed.