asv4k8

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?

2BarRacing

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

AaronZ34

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.

asv4k8

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.

asv4k8

Define "large gain" 5hp? 10hp? more?

AaronZ34

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.

2BarRacing

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

asv4k8

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.