Home 
Home Search search Menu menu Not logged in - Login | Register
> Jensen Healey & Jensen GT Tech > Engine & Transmission > Optimal Street Exhaust System

 Moderated by: Greg Fletcher
New Topic Reply Printer Friendly
Optimal Street Exhaust System  Rate Topic 
AuthorPost
 Posted: 03-11-2006 06:55 am
  PM Quote Reply
1st Post
Jim DeClerck
Member


Joined: 03-16-2005
Location: Huntington Beach, California USA
Posts: 73
Status: 
Offline
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?


Back To Top PM Quote Reply  

 Posted: 03-13-2006 01:51 pm
  PM Quote Reply
2nd Post
Judson Manning
Member


Joined: 03-14-2005
Location: Atlanta, Georgia USA
Posts: 406
Status: 
Offline
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

 

Back To Top PM Quote Reply

 Posted: 07-11-2006 01:07 am
  PM Quote Reply
3rd Post
Ron Earp
Member


Joined: 03-12-2005
Location: Cary, North Carolina USA
Posts: 339
Status: 
Offline
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

Back To Top PM Quote Reply  

Current time is 12:33 pm  
> Jensen Healey & Jensen GT Tech > Engine & Transmission > Optimal Street Exhaust System Top




UltraBB 1.172 Copyright © 2007-2011 Data 1 Systems