Jim Galbally

something Chip said to me yesterday got me thinking...

can you get a device that varies the size of the exhaust on the fly (like a restrictor) so that you could get a nice tiny exhaust for low down torque, but open up for top end power.

similar to what you get on 2 strokes, with a servo controlled powervalve that makes the exhaust on the barrell larger/smaller as the revs/throttle increase/decrease

and more importantly, WOULD IT WORK?

reason that got me thinking, is that ive just had a nice freeflowing front section put on my exhaust, and it seems to have sapped a lot of the midrange torque i so love about my car... wondering if theres any way of getting round it.

CossieRich

iTrader: (1)

The way round it Jim is to buy a cossie.

Anonymous

Jim, as i said to you yesterday, mid range torque relies on gas speed up the length of the pipe, a small restrictor with a different diameter wouldnt help as it would be such a short item, you would need to resize the whole exhaust for the effect you are after!

Jim Galbally

but chip what if it was a long section say in the front pipes... sureely that'd increase the overall speed without just adding useless backpressure?

my understandings of physics n airflow etc suck tho

i mean, if it works in 2 strokes, why wouldnt it work on a car? is it because of the physical limitations of where to locate the thing?