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09-21-2004, 10:14 AM | #1 |
Scooby Newbie
Member#: 68129
Join Date: Aug 2004
Chapter/Region:
HIIC
Location: Osan AB, Korea
Vehicle:2001 Impreza RSTi White |
Equal length vs. Unequal length headers
Well I have done a search with no luck.....what are the differences?......pros and cons????
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09-21-2004, 10:20 AM | #2 |
Sammo Hung
Moderator Member#: 10613
Join Date: Sep 2001
Chapter/Region:
South East
Location: N Fla / S Ga
Vehicle:2002 USDM WRX WRB |
not again..
but here's the short.. unequal length..the primarys are not the same length. the tubing from exhaust port is a different length. equal length..just what the name imples.. the tubing from each exhaust port is the same length. So I have had the following headers personally. GT-Spec V2 (unequal length) GP Moto (equal length) the unequal gives you the exhaust note of a boxer somewhat. the equal makes sound of nothing like a boxer..my buddies say I have a honda.. spool.. the stockers give you the fastest of three when it comes boost. unequal second and equal third..but the linear delivery of power is trade off. my 2 cents.. Ben |
09-21-2004, 01:16 PM | #3 | |
Scooby Specialist
Member#: 18978
Join Date: May 2002
Chapter/Region:
SCIC
Location: orange county, CA
Vehicle:96 brighton 05 AP2 ,09 GE8 |
Quote:
Peter |
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09-21-2004, 07:09 PM | #4 |
Scooby Specialist
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Join Date: Jul 2004
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MWSOC
Location: Kansas City
Vehicle:05 Focus "ST" '80 Honda CM400T |
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09-21-2004, 07:41 PM | #5 |
Scooby Specialist
Member#: 53775
Join Date: Jan 2004
Vehicle:03 WRX Silver |
A good equal length header will get the engine pulses to the turbo in a cleaner and faster manner. A header like the QTP one will have the primaries work together in the Tri Y set up. Increasing scavaging and velocity. The header is one of the most important part of the engine combo. If its not done right it will leave alot of extra horsepower and torque lost.
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09-21-2004, 07:48 PM | #6 | |
Sammo Hung
Moderator Member#: 10613
Join Date: Sep 2001
Chapter/Region:
South East
Location: N Fla / S Ga
Vehicle:2002 USDM WRX WRB |
Quote:
not all us have the twin scroll set up that you have. And if I could I would most definitely have the twin scroll. And just to clarify, twin scroll is factory equal length. But he did not ask about twin scroll just the differences between equal and nonequal length header. But after years of on the road testing..ie driving my daily ride.. with headers..makes wonder if I went in the wrong direction.. ESX uses ported stock manifolds...hhmm.. another 2 cents.. Ben |
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09-21-2004, 10:03 PM | #7 |
Scooby Specialist
Member#: 40431
Join Date: Jul 2003
Chapter/Region:
SCIC
Vehicle:2009 Scion XB |
I'll take unequal length. Love the bub bub sound of the boxer engine.
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