Side Pipes with headers
Thread Starter
Drifting
Joined: Oct 2008
Posts: 1,901
Likes: 10
From: Woodstock GA
Side Pipes with headers
Ok Fire away,but I like to get some knowledge.Original side pipes lose some horse power.Im curious about side pipes with headers.
Give me some feedback .Firesuit on...
Thanks,Mark
Give me some feedback .Firesuit on...
Thanks,Mark
Thread Starter
Drifting
Joined: Oct 2008
Posts: 1,901
Likes: 10
From: Woodstock GA
Factory side pipes with headers.I have headers now and was wondering if I should go back to stock exhaust with the side pipes that I will be installing.
Last edited by VetteRed1965; Feb 3, 2009 at 08:05 PM.
Team Owner
Joined: Oct 2000
Posts: 38,897
Likes: 1,926
From: Washington Michigan
The losses in sidepipes are from the 1-7/8" inner pipe diameter in the straight section, primarily at WOT at high rpm; that restriction exists regardless of manifolds vs. headers ahead of that pipe section.
Racer
Joined: Nov 2005
Posts: 436
Likes: 14
From: LIFE IS GOOD Along the Strand New Jersey
Stock manifolds !
The loss in the pipes far outways any possible loss in the manifold.
They do make a header for sidepipes(don't remember the brand) but you wouldn't gain anything performance or sound with them.......
The loss in the pipes far outways any possible loss in the manifold.
They do make a header for sidepipes(don't remember the brand) but you wouldn't gain anything performance or sound with them.......
Le Mans Master
Joined: Jan 2005
Posts: 8,226
Likes: 2
From: Lake Wylie SC
Comparing apples to apples ON A DYNO !!!!!, sidemount headers cannot make the power that straight headers can. On the sidemounts there are two extra power robbing bends and the under the frame curves will require smaller diameter collectors than what can be used on straight headers (especially since we are talking of cars low to the ground and not 4 wheel drive trucks).
Those setups that have their collectors outside the car as a general rule have to big of primaries and are to long in length
However real world is different and on the street a 25% smaller collector will outperform the larger one in most circumstances. But then all the gains made by the headers are thrown out when you choke them down with commercial sidepipes.
The key to street exhaust performance is maintaining the high velocity that starts back in a combustion chamber that is to be designed for street performance. There are things you can do to help maintain velocity and although it can never be increased, it can certainly be slowed down by either going to big or to restrictive in any part of the system from the flange to the exhaust tip.
But as far as the sidepipe design of a street header/side-pipe exhaust system, a nice smooth bend has very little effect on it.
Doug
Those setups that have their collectors outside the car as a general rule have to big of primaries and are to long in length
However real world is different and on the street a 25% smaller collector will outperform the larger one in most circumstances. But then all the gains made by the headers are thrown out when you choke them down with commercial sidepipes.
The key to street exhaust performance is maintaining the high velocity that starts back in a combustion chamber that is to be designed for street performance. There are things you can do to help maintain velocity and although it can never be increased, it can certainly be slowed down by either going to big or to restrictive in any part of the system from the flange to the exhaust tip.
But as far as the sidepipe design of a street header/side-pipe exhaust system, a nice smooth bend has very little effect on it.
Doug
Melting Slicks
Joined: Sep 2001
Posts: 2,800
Likes: 2
From: Fairless Hills PA.
Stahl will also build you a set of custom tuned equal length headers but they are Very expensive.
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to install. No bending pipe to fit and they look sharp.
I have not started her up yet . I am still hot rodding.
Just a option for you OP and...
Good luck
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