Originally Posted by Full-Race Geoff

that is not entirely correct -- there is nothing at all wrong with using a single scroll turbo on a twinscroll manifold!!

Originally Posted by Full-Race Geoff

the HTA35R is a garrett 35R with a bigger 7blade compressor wheel. Thats it, just a bigger compressor wheel. The HTA modification does not change turbine wheel or housing, so you could easily use a twinscroll manifold and housing

That being said, twinscroll setups normally dont "like" mismatch turbos, so it might work well, and it might not. Hopefully we can do a back to back test of twinscroll 35R vs twinscroll HTA35R on Evodan's car



that is not entirely correct -- there is nothing at all wrong with using a single scroll turbo on a twinscroll manifold!!




you can send the twinscroll 35R to FP and get the HTA upgrade. You just NEED to make sure you get a twinscroll T3 Garrett 35R. The turbonetics twinscroll T4 flanged F1-35R will not work with the HTA!







i spend a lot of time in union beach (117 on the pkwy), thats where we do most of the east coast builds/fabrication. moving to matawan shortly!



sounds good chad! sean ivey was going to squeeze us in but i think he's been really busy lately. your dyno would be a great test facility for the TS 30R vs TS 35R test



top mount manifolds will not result in increased top end performance. If anything it would decrease the performance because of the convoluted downpipe you have to run...



i dont think that is correct



you are correct (again)!! im not sure if you remember david buschur's stock replacement header test, but a great comparison of this is RNR's stock replacement ramhorn (which lost power everywhere over stock). This is an indication of what happens when too big and too large a runner is used, all else being equal

Originally Posted by CO_VR4

Geoff,

In the context of Evo manifolds, what do you consider "too big and too large" a runner diameter?

Originally Posted by GTVEVO

Sure which one will perform better. Tell us please. A manifold built to match or a manifold built for twin scroll used on a single scroll turbo.

Originally Posted by Full-Race Geoff

that depends on the turbo size and range of exhaust mass flow rates at the intended optimized operating area



my understanding is that there is no difference. I can not say for sure, but i have seen results to back this up.

Originally Posted by Full-Race Geoff

that depends on the turbo size and range of exhaust mass flow rates at the intended optimized operating area

Originally Posted by scorke

Really geoff, no gains/advantages between running a divided hotside with a divided manifold vs the divided manifold and open hotside?

Originally Posted by CO_VR4

Well, let's assume we're continuing this thread with the HTA and the 35R TS as the turbos under discussion. Can you give an opinion on what would be "too big and too large" a runner (generally) under those circumstances? Thanks.