john banks

http://www.buickgn.com/electricexhaustcutout.htm




[Edited by john banks - 10/26/2002 11:43:10 AM]

dowser

Also done by Variflow in Oz - still considering it to get a quiet car in town

Richard

Hoppy

Nice!

A mate of mine had something similar on his '60 Velocette bike, operated by a cable on the handlebars.

John, would something like this need a fuel remap when closed?

Cheers,

Richard.

john banks

I doubt it would need a fuel remap as you would probably only use this in closed loop conditions?

matt b.

apparently, all the really expensive ferraris (i.e all of them) have this device as standard so that they can past stringent e.u. noise regs. knew that piece of useless trivia would come in handy one day.

Floyd

iTrader: (9)

But we don't have dump pipes do we?

I'd prefer a tuneable bb.

Those crazy Yanks, eh!

F

easyrider

There are a few motorbikes out there with these on them like the Yamaha R1(valve is called EXUP i think),i think it is controlled by the ecu and throttle and it helps give the bike its much famed torque, interesting idea fitting it to a car,i wonder if it would make a noticable difference to performance? I know it does on the bikes when the valve is seized open (not enough back pressure i presume)

Danny Fisher

I think Apexi also make these units.

Dan

dowser

Autospeed has a decent article - search on Variflow. Not sure it can be used to improve performance on a turbo'ed car - any backpressure after turbo is bad, no? You'd just shut it a bit to reduce noise at low load/revs, and open fully at all other times.

I'd be interested in pricing info. if anyone gets that far.

Richard