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Manifolds log or 3-1

Old 06-14-2009, 04:05 PM
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Default Manifolds log or 3-1

Building a v6 audi motor up with a single 62-1 turbonetics. is there a big difference in power between log manifolds and manifolds that use a 3-1 merger design with equal length runners?
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Old 06-14-2009, 04:49 PM
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you got a 2.8 3.0 3.2 or 2.7t? just a question and logs are ok but 3-1 is better just a thought but i i work on audis daily and on a 2.7t you have to drop the trans to even get to the turbos how exactly you looking at doing this
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Old 06-14-2009, 10:31 PM
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Originally Posted by asv4k8 View Post
Building a v6 audi motor up with a single 62-1 turbonetics. is there a big difference in power between log manifolds and manifolds that use a 3-1 merger design with equal length runners?
An equal length manifold will result in slightly longer spool time (Hardly noticeable), and a large gain in power throughout the rev range. But good luck fitting headers with 20" primaries.
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Old 06-15-2009, 06:14 PM
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Originally Posted by 2BarRacing View Post
you got a 2.8 3.0 3.2 or 2.7t? just a question and logs are ok but 3-1 is better just a thought but i i work on audis daily and on a 2.7t you have to drop the trans to even get to the turbos how exactly you looking at doing this
The battery has been moved to the trunk and the turbo sits where the battery used to sit. Its a 2.8 12v that has been reworked for boost.
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Old 06-15-2009, 06:16 PM
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Originally Posted by AaronZ34 View Post
An equal length manifold will result in slightly longer spool time (Hardly noticeable), and a large gain in power throughout the rev range. But good luck fitting headers with 20" primaries.
Define "large gain" 5hp? 10hp? more?
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Old 06-15-2009, 07:13 PM
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Significantly more on the tests I've seen. Here's one, done on a B-Series (Whatever the ---- that is, some Honda motor)

http://www.full-race.com/articles/Bs...st_writeup.pdf

They gained 48whp and 44wtq with an equal length header over a log/cast manifold. The manifold spooled 400rpm sooner, but I'm sure all of us would give up a couple hundred rpm for almost 50 horsepower at the wheels! And that is just on a 300whp engine (With the header), of course the higher output engines are going to benefit much more.
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Old 06-17-2009, 10:43 PM
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so wait a 2.8l 12v you got like an old c4 100? inn that case there is a lot of room in that engine bay
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Old 08-17-2009, 10:53 PM
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Originally Posted by 2BarRacing View Post
so wait a 2.8l 12v you got like an old c4 100? inn that case there is a lot of room in that engine bay

no, its the first b5 the only year that used the 12v motor, aside from that it was the only year to have the European size license plate holder and euro tail lights/city lights.
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