Which Sebring?

[Olivier Auvray]

Please, don't ask for price..........

Olivier, how much? Does it get a muffler or just a race tailpipe? Megaphone? Do they do the sheet to "tune" via internal shape?

How much: I don't know

Does it get a muffler or just a race tailpipe: it comes with a muffler. In France we have a sound level limit on tracks, between 85 and 102 dB (you don't start if your car is too loud).

Regarding the design, Chabord has the knowledge + a big computer + something like a flow bench + a dyno..........

or

or

997 GT3, + 15 HP (the factory muffler is hard to beat) and 63 pounds lighter....

[Mike Ruddy]

A Sebring for sale on DDk here.

http://www.ddk-online.com/phpBB2/viewto ... 4c44cd2b37

[David Pettengell]

It had gone by the time I logged on but thanks!

[David Pettengell]

So, any advice on a great replacement exhaust that wont lose me lots of power?

[Olivier Auvray]

Eisenmann:

[Craig Richter]

Martin, I just noticed this topic. Speedy has a warmed-up 1720cc/Weber motor and does run a Bursch, mostly as tribute to my past association with Roger and Doug Robinson who made the system. Revs easily over 6000 and is worth a pony or two, but Speedsters are a lot different to drive than Coupes.
My other car (present from sister and brother-in-law, lucky me) is a S90 and has a stock muffler. Wouldn't have it any other way. There is a long chapter in my old book about stock mufflers and why they work so well.

[Neil Bardsley]

So, any advice on a great replacement exhaust that wont lose me lots of power?

Apart from stock. Email John Benton he has some trick parts. However, given I think you have a large bore engine, that Cliff built (?), what does Cliff recommend?

[C J Murray]

I did build the engine. The size is 1720cc but regardless of size it is hard to beat the stock muffler.

[Erik Thomas]

Anyone done a dyno test on the Eisenmann? it sure looks the dogs bollocks. Would be nice if it equalled stock..

[Erik Thomas]

I just purchased the Eisemann system.. USD1206 including shipping. I will dyno test it on my SC engine when I am messing with my new air filter/velocity stacks when it arrives in about a month. I will start with the stock exhaust, do stock air cleaners. Then do air cleaners, then do stock air cleaners and the new exhaust, and finally, the new exhaust with new and improved air cleaners. I will be doing this on KTR motorsports chassis dyno, which has been very accurate in my experience.

[Olivier Auvray]

Anyone done a dyno test on the Eisenmann? it sure looks the dogs bollocks. Would be nice if it equalled stock..

I did it!

1600 cc engine, SC camshaft, 9.3 or 9.4 CR (I don't remember exactly), 40 PII carbs (with 30mm venturies for better torque curve) and the "Sebring" (or kind of) from Einsenmann: 96 Hp @ 5800 rpm.

[C J Murray]

The correct way to evaluate an engine or even an exhaust is to test, change, test and then lay one graph over the other. Peak HP is only part of the story. You need to look at the entire graph to determine where things are better and where they fall short.

[Martin Benade]

Engine only, out of the car?

[C J Murray]

Chassis dyno, engine in car.

[Martin Benade]

CJ, I didn't post quick enough, I wondered about Olivier's dyno numbers, good enough that I assume it was engine only.