Side exit project!!

[Pete_RS2]

Careful you don't burn the paint on the doors. Anybody see that Dodge Viper on Top Gear last night ?

[Greg_S]

Yeah we were talking about that in the office a little while ago, havent seen it yet so gonna watch that one tonite.

[Graham]

You wouldnt be happy if the first time you give your £60K+ motor a blast out, the bodywork caught fire would you. And only 500HP out of an 8.3L V10, i would like to know what torque it pumps out.

[audiman]

The cost for just the SS is gonna be somewhere in the region of 150-200 quid. Thank god im owed a favour by the dude thats gotta weld it up.

[Audi_CQ]

Now then, this isnt as easy as I thought it was gonna be
Getting a 3" exhaust system down thtough the transmission tunnel of an S2 is no mean feat. First up was the silencer, it needed to be big so that hopefully it should remove 'some' noise!! Also this time it had to be rubber mounted as the last system was hard fixed under the car!! Not good. Here are some pics of the progress so far.

3" all the way isn't a problem and with two good silencers it will be quiet. On the late Ozzzt's car (RIP m8 ) the new owner has 3" with 2 ferrita(made in Sweden) silencers, and it's nearly as quiet as a org. system until you floor it

Cheers,
Roger

[audiman]

Noise isnt something im too worried about, its being able to get it over the speed humps to my girlfriends house!!

[Jamo]

Careful you don't burn the paint on the doors. Anybody see that Dodge Viper on Top Gear last night ?

Yeh i saw that, scary as hell, crazy yanks!

[Audi_CQ]

Noise isnt something im too worried about, its being able to get it over the speed humps to my girlfriends house!!

Then remove that large silencer and use two 2.5" pipes down the middle, 3" over the back and a single good quality silencer at the rear. Gives a real nice sound. I know

[Jamo]

Tom, any update?

It's like waiting for Lord of the Rings DVD release at the moment....................

[audiman]

Yeah, sorry about the delay

Its now on the car and running, i will post some pics up when my broadband is back up and running. The tailpipes are just oval 3" pipe, i havent decided what to do with them yet.

I took the car for a quick blast around the trading estate, and the noise is great, its not too loud and it now spits flames out of both sides!! I had a 2 foot flame at one point!! LMFAO

It really does sound good. I ended up having to weld and create it myself, so its not as I would have wanted it. I had to use a MIG welder as I cant use a TIG. So welds arent nice and neat. But hey, its strong as fook and will burn old ladies legs

[Jamo]

Burn baby, burn!

Top stuff, can't wait for next meeting to catch a glimpse (although i'll be standing some distance away)

[Keeper of The Kitten]

@ Audi CQ and all the other folk here - if you're using single 3" in places, you get the same cross section (approx) from a pair of 2-1/8" pipes, shouldn't really need 2-1/2"? Even more clearance and more routing possibilities?!!

Ok, now for a "cat among the pigeons" question: what use (if any) is a separate wastegate exhaust? I can't think of any, but I've seen some Rice Rockets with exactly that sort of installation.

__MDC__

[Doug_RS2]

a seperate wastegate exhaust means the wastgate can modulate the boost easier as the exhaust gases are not interfering - or so they say - it sounds bnetter is another reason.

I fancied having a 3" exhaust to the Y point where there are 4 2" exhausts going off to the sides - 2 each side - that will give more ground clearance - just need to see how much work it is.

Where are the pics Tom????

[Lee]

Don't forget to consider the Cross Sectional Area to Wall Surface Area ratio. A 3" pipe is probably closer to 2x2.5" than basic area calc would suggest. Don't forget that gas flow is zero at the wall surface raising to a maximum a the centre of the pipe.

Just go for a 3 inch pipe straight out through the hood: then you can see the flames as you are driving!!

As for separate wastegate pipes. MTM's RSR (originally RS2 before Audi asked them to change the name due to their impending Porsche/Audi S2 hybrid) had a separate wastegate pipe routed to the rear of the car. They reasoned that a downpipe large enough to flow the gasses when the wastegate was modulating at high revs would have required a 4" downpipe for adequate flow. Hence the reason for a separate wastegate and 3" downpipe. A 4" on is tough to fit on an S2.

[Greg_S]

3" is tough enough let alone 4"!!