How does Supertrapp work?

[sfzBimmer]

I recently saw an M-Coupe with the Supertrapp exhaust system. It looks, well, plugged up. How does it work and how does it sound?

[Motorsport3]

There is a cap on the end. In front of it are diffuser disks. The more you add, the more exhaust can escape which results in less backpressure, less torque, and more noise. Take them out and it's the opposite of above. As far as sound goes, I think it really depends on what you have. I have heard them on a 65 mustang fastback that had the 289 "hi-po" V8 and it was really deep and throaty. I've also heard one on a CRX and it had the usual tinny 4 cylinder sound.

[Joey325i]

Originally posted by Motorsport3
There is a cap on the end. In front of it are diffuser disks. The more you add, the more exhaust can escape which results in less backpressure, less torque, and more noise. Take them out and it's the opposite of above. As far as sound goes, I think it really depends on what you have. I have heard them on a 65 mustang fastback that had the 289 "hi-po" V8 and it was really deep and throaty. I've also heard one on a CRX and it had the usual tinny 4 cylinder sound.

actually you have that switched, the more disk's you have the more back rpessure, and with all the disk off, its a very free flowing exhaust, the disk add back pressure

[Dashel]

Can someone give me a little Exhaust 101 on how back pressure works?

[Motorsport3]

Originally posted by Joey325i
actually you have that switched, the more disk's you have the more back rpessure, and with all the disk off, its a very free flowing exhaust, the disk add back pressure

How can that be?

The disks widen the area for exhaust to escape.

[Joey325i]

Originally posted by Motorsport3
How can that be?

The disks widen the area for exhaust to escape.

the disk cover the hold up, where as having the thing open, so the disk cap it off and hold pressure in, the more disk the more pressure is held in, basically it has to find its way out, the disk have holes in it, its like a jar, the top having holes poked in it vs a open jar, which one will let the water flow out faster?

[Joey325i]

Originally posted by Dashel
Can someone give me a little Exhaust 101 on how back pressure works?

back pressure good for NA cars bad for FI cars, not too sure what you mean but the more back pressure you have the better low end you will have, a more free flowing exhaust you will have better top end power

[Motorsport3]

Originally posted by Joey325i
the disk cover the hold up, where as having the thing open, so the disk cap it off and hold pressure in, the more disk the more pressure is held in, basically it has to find its way out, the disk have holes in it, its like a jar, the top having holes poked in it vs a open jar, which one will let the water flow out faster?

OK, I see now...I stand corrected!

Your car is looking sweet, by the way!

[Joey325i]

Originally posted by Motorsport3
OK, I see now...I stand corrected!

Your car is looking sweet, by the way!

hehe thanxs

[alphaoenz]

Originally posted by Dashel
Can someone give me a little Exhaust 101 on how back pressure works?

Backpressure is for suckers.

[single]

Backpressure creates more stress on the motor requiring it to work harder, creating more force which is what torque is. This is great for downlow power, but blows for high, free reving motors like BMW's. If you want power in a straight line, this is a good way, but on the track I don't see the pracitcality in it.

Wes

[Gofast]

Originally posted by Joey325i
actually you have that switched, the more disk's you have the more back rpessure, and with all the disk off, its a very free flowing exhaust, the disk add back pressure

Nope, he was right, the fewer disks, the more backpressure. The more disks you have, the more area there is for exhaust to escape.
but without any disks, it's wide open.

edit: I know I dug up an old thread and I'm sorry.
Just don't want someone to stumble on this like I did and be misled.

[Motorsport3]

I had a feeling I was right.