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 Posted: 03-11-2006 07:55 am
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Jim DeClerck
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Joined: 03-16-2005
Location: Huntington Beach, California USA
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Since 2.0 and 2.2 liter engines are unique I assume that the best exhaust system for one is not best for the other.  I have single pipe systems on both my cars, a Delta single pipe system on the 2.0 and a 2.25" single pipe on the 2.2.  Both make a big loop over the rear axle which diverts the exhaust stream from a straight line and probably causes some inefficiency.

Particularly for the 2.2, which may see 8500 RPM at the upper extreme, is 2.25" the right diameter for the optimum exhaust flow?  Is there a rational route for the pipe which avoids the big loop?  This is a car that will be mainly driven on public roads.

I've sent a note to sales.borla.com to see if they have some answers.  Any good ideas from the members?


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 Posted: 03-13-2006 02:51 pm
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Judson Manning
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Location: Atlanta, Georgia USA
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Jim,

I can't say there's one single 'optimum' solution, but I can tell you after going through 4 different systems of my own what works and what doesn't.

There's really no way around the bends up and over the axle; unless you decide to go racing and install a turn-down just behind the headers.  The important thing is to get smooth bends.  The muffler shops I've worked with generally do a crappy job of making smooth bends.

I ended up buying 'J' and 'U' bends from http://www.jegs.com and making my own loop over the axle.  As I remember from installing Delta's kit on a customer car, it had pretty smooth bends, and was generally of very good quality.

Pipe diameter is goverened by how much HP you've got.  Unless you do some serious porting work like "Yellow Dog", don't expect much past 190hp.  A single 2-1/4" pipe works fine for my 2.2 907/910 hybrid.

Mufflers are the other half of the equation.  I'm using a 31" glass-pak under the transmission and a Flowmaster 40-series out back.  It's free-flowing, but when I go to car shows, people think I'm running a V8 conversion!

To confuse the issue, http://www.flowmaster.com suggests a minimum pipe of 2-1/2" for 200hp.  The only problem with a pipe that big is clearance over the axle.

Judson

 

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 Posted: 07-11-2006 02:07 am
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Ron Earp
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Judson Manning wrote:
To confuse the issue, http://www.flowmaster.com suggests a minimum pipe of 2-1/2" for 200hp.  The only problem with a pipe that big is clearance over the axle.

Judson

 

And that is what ball peen hammers are for - to pound that floorboard/body and get some clearance!

Ron

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