My 35R EVO build is almost done!!!! ( a few progress pics for you guys)
Casey you didn't offend me at all, I think we are all on here for the same reason, we want to learn how to make our cars as quick as possible!!! That post was really directed to Tony1, he sent me a PM that cleared a lot up about his personal goals and reasons behind the design, and it has become more apparant that the exhaust manifold for this setup might be better suited to the car than I previously assumed. Good stuff, keep it up, and yes I would love to see/hear about your results!
Scorke
Scorke
Originally Posted by Tony1
Hey guys, i'm Tony, the one that is doing the fabrication on this project. Thanks for the comments.
There is a big misconception that longer runners automatically equals slower spool, but it is not true. It can be true, but it is very dependant on the turbo size and the manifold design and build. With a small restrictive turbo you will have alot of exhaust backpressure and the manifold design won't make much difference in power, as you've seen with stock evo setups. As you get closer to a 1:1 pressure ratio from intake to exhaust, things start changing a bit. You can run a much more aggressive cam profile, your knock limit is raised, and you can take advantage of a "tuned" header. We don't know exactly what this is going to do with this setup, but our research shows that it should perform well. There's a reason you see stuff like this on race cars. Ever seen John Shepard's engine bay? We'll know for sure soon enough when we hit the dyno with it, and we'll be sure to keep you guys informed on the results.
-Tony
There is a big misconception that longer runners automatically equals slower spool, but it is not true. It can be true, but it is very dependant on the turbo size and the manifold design and build. With a small restrictive turbo you will have alot of exhaust backpressure and the manifold design won't make much difference in power, as you've seen with stock evo setups. As you get closer to a 1:1 pressure ratio from intake to exhaust, things start changing a bit. You can run a much more aggressive cam profile, your knock limit is raised, and you can take advantage of a "tuned" header. We don't know exactly what this is going to do with this setup, but our research shows that it should perform well. There's a reason you see stuff like this on race cars. Ever seen John Shepard's engine bay? We'll know for sure soon enough when we hit the dyno with it, and we'll be sure to keep you guys informed on the results.
-Tony
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From: Work - New York, Alaska, Mexico or the Caribbean. -Home - Tx Hill Country
Originally Posted by Tony1
very similar merge collectors and pretty similar runner lengths, both spec'd by Burns Stainless...
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Joined: Dec 2005
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From: Japan
Originally Posted by robertrinaustin
I'm not trying to be an ***, but the only pic I could find of Shepherd's manifold doesn't look anything like your mani. Maybe he's running something different now?
