Cbrd custom exhaust manifold! It's nasty!
Now that's a manifold!
It will be cool to see what it does. Although gauging how well it actually works with a custom turbo that is untested is just about impossible.
A local guy had one of those old Hytech headers on his B-series Honda. Other then cracking numerous time on him, it seemed to work fairly well at lower boost levels. Compared to other local B-series guys with similar setups, he was about 50 HP ahead at 91 octane boost levels. Once the boost went up though, the advantages seemed to disappear. Sounds similar to the STM findings in that the large turbo can keep the positive pressure differential to much higher boost levels and the bias will be stronger too.
I think one major weakness to these setups is the bend in the collector. Adding that 90 degree bend adds a ton of volume to the collector. The whole point of a merge collector is to minimize volume to keep velocity high, reduce flow separation to smooth flow and reduce turbulence, and providing a directional flow preference to reduce reversion. That 90 degree bend slows flow, causes turbulence, and increases collector volume. All bad things, IMO.
Now going long tube with a forward facing setup (or "sidewinder" if possible) so the merge collector fires straight into the turbine housing with no bend between the two...
A local guy had one of those old Hytech headers on his B-series Honda. Other then cracking numerous time on him, it seemed to work fairly well at lower boost levels. Compared to other local B-series guys with similar setups, he was about 50 HP ahead at 91 octane boost levels. Once the boost went up though, the advantages seemed to disappear. Sounds similar to the STM findings in that the large turbo can keep the positive pressure differential to much higher boost levels and the bias will be stronger too.
I think one major weakness to these setups is the bend in the collector. Adding that 90 degree bend adds a ton of volume to the collector. The whole point of a merge collector is to minimize volume to keep velocity high, reduce flow separation to smooth flow and reduce turbulence, and providing a directional flow preference to reduce reversion. That 90 degree bend slows flow, causes turbulence, and increases collector volume. All bad things, IMO.
Now going long tube with a forward facing setup (or "sidewinder" if possible) so the merge collector fires straight into the turbine housing with no bend between the two...
