Little help with 7A exhaust please!

[leo]

Hello,

most people (well... all of them) who have or had an Audi 7A engine (2.3 20v quattro) have custom made middle and rear muffler , unfortunately the effect is that these cars have less power with these mufflers.
The main question is - how to make a custom exhaust properly - without loosing power ?
Any help ? Please

[WabTheKing]

get a back box which you can adjust the back pressure on then you can play about with it untill you get it right

[leo]

how does it look like ?

[Micky B]

The best way is the hardest(most expensive), we make it like that:
make some modificated exhaust systems, a muffler or anything you or anybody think could work on your car,
make it ready to fit,
go on the rolling road test it as original setup,
then change it right a way and test again.
see what you have done.....

important: do all test on the same dyno, on the same day, same tyre, fuel air temp......etc

I had tested 5 system mod a few years ago on a peugeot 106 1.6 rally , the first mod
made minus 8hp from 106hp to 98 hp ......
don;t buy anything without a test...

[leo]

I see, this is a hard way...
Maybe someone know what are the dimensions and how is build the original middle muffer ?

[WabTheKing]

i was looking at doing something like this, two discs which you could adjust the opening off, thus reducing or increasing the flow of gas out of the tail pipe to whatever it needs to be

[Keeper of The Kitten]

Do they still make those Supertrapp exhausts with the discs on the tailpipe? The exhaust gases radiate outwards from the centre of a disc (a small shielded area stops you burning the bumper!)

More discs increased the area and therefore reduced the restriction, less discs reduced the area and consequently increased the restriction. Probably the quickest system to tune but perhaps not to everyone's taste?

__MDC__