Originally Posted by FazdaRX_8 (Post 3832278)

CSL mawnee's Manifold worked out great for him, he has a dyno somewhere in that thread, with a poor tune but still made 300, I believe.

Originally Posted by zoom44 (Post 3832495)

RB tested 5 or so different header versions before settling on the one they sell. I've held them all. there is only one way which makes better power and that way would not pass carb so its pointless for them.

Originally Posted by Nemesis8 (Post 3831888)

I love my Sohn adaptor for oil metering, so this needs to be considered for the manifold design for me. You can pry it from my cold torque-less fingers... haha

Originally Posted by TeamRX8 (Post 3832931)

That's just the results of their limited testing and conditions. It doesn't make them the know-all experts in Renesis manifold design. The details matter. This is well proven in racing. The best funded professional race teams rarely conclude that they have the best. They never say never and have the resources to pursue anything and everything possible. Unless you test every possible design in every possible configuration and condition plus get all the details right you may never discover the ultimate combination. You may never discover it any way if its something so different and bizzare as to have been considered, so simple as to be overlooked, or you just didn't get the right combination of details required to optimize it. It's often as clear as mud, though some people will profess to have the best because in their mind they did it all and they can't possibly be wrong or up-ended by someone else. It happens on this forum all the time.

In a typical commercial situation, they spend as much funding as they think can be recovered in sales profits and call it a day. In the end, RB provides a reasonable quality header that the avg street guy can slap on and be content with.

Originally Posted by FazdaRX_8 (Post 3831923)

this is an interesting statement, what led you guys to this conclusion, i tried to find some dyno charts on the turblown website but could not find any,

except for the one that was done with partial throttle, running around in another thread

Originally Posted by wcs (Post 3832902)

I own that kit now.

It's not installed yet, so if there are any questions about the manifold (pics or measurements) I'm willing to try and answer them.

Originally Posted by 1Revvin7 (Post 3832993)

There isn't an engine on the planet that doesn't benefit from actual bends over brick wall transitions. A turbo manifold is suppose to be as free flowing as possible. Just look at F1 80s turbo motors; large radius gentle bends. The manifold wasn't designed to keep the rotors exhaust pulses from interfering with each other, as said that won't make that big of a difference because of the center port exhaust. It was designed to be free flowing.

I have done back to back testing on a pair of Rx-7s that showed a 1000rpm gain in boost threshold and 20rwhp across the board from a hks style log manifold to tubular design. Its pretty much the same on piston engines, even small 4 cyl which you can somewhat compare the Renesis too( low overlap/ and more exhaust restrction(valves/sideports)). You don't see any performance piston motors running log manifolds.

We looked at the boost curve compared to MM's smaller 3076R, and this bigger 1.06 Gt35R spooled almost as fast at partial throttle. Given the dyno doesn't exactly show real world conditions, ie: transient response. I haven't seen a lot of top mount turbo systems dynos, but they look awfully laggy to me, and these have all been 60~ish mm turbos.

You can't really compare n/a headers to turbo manifolds either, there is no pulse tuning in a turbo manifold. Just look at supercharged top fuel dragsters, the headers aren't even collected. You just want to get the exhaust out as fast and as easy as possible when you are under positive pressure. Even so you sure don't see RB selling log manifolds. Futhermore in an ideal world under 1 bar you are at twice the atmospheric pressure making your engine basically twice its size. If you had a 2.6L Renesis you would see bigger gains in n/a form from the exhaust system.

Outside of all this theory, real world results show VERY fast spool for a big Rensisis turbo, and if you look a the powerband its almost doubled everywhere, not just up top.

Originally Posted by PhillipM (Post 3833325)

The reason it doesn't make as much difference on the Renesis is the air is already doing two 90* bends to start with anyway, where it's energy is the highest, but every bit helps.

Originally Posted by Mawnee (Post 3833022)

Oh noez! All my uber super secretz to powa iz lost!
http://i7.photobucket.com/albums/y27...ne/oh-noes.gif