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Old 11-14-2011, 11:08 AM   #15
Full-Race Geoff
Scooby Specialist
Member#: 133386
Join Date: Nov 2006
Chapter/Region: Tri-State
Location: AZ/NJ
13 F150


Originally Posted by TwinscrollGT35R View Post
Geoff, I am running the FR twinscroll with a 35r and the 1.06 hotside. Goodspeed built it with a cosworth long block, tgvs and intake manifold. @ 3300 rpm I have some surging going on. Any ideas? Also I want to get faster spool. What BW turbo would work. I'm 480 whp on 91 and 560 whp on 109. Is there a direct swap turbo that might be little bigger and have better spool? Other then... I love the twinscroll set up.
Great to hear you are already running a Full-Race twinscroll turbokit. This setup is very versatile becuase it allows you to run almost any twinscroll t4 turbo on the market. The surging you hear is most likely becuase your compressor housing is not the fully ported shroud version (garrett updated these for 2011) - if you can post a picture of the compressor inlet i can verify that.

For a turbo that will perform better; ie faster spool and more top end, i suggest BorgWarner turbos would be a direct bolt-on for your car and deliver what you are looking for? More info like what is your power target, boost target and fuel used, as well as what is done to the engine? i can try and offer some recomendations

Originally Posted by Beetspeed View Post
Is there a similar comparison of that turbo with cupped wheel and the flat tip turbine wheel? Oh, what boost and fuel was run for both?
walter - have not done any back to back subaru tests with cupped tip vs flat tip on the turbine wheel - but we did do it on a 25psi 8375 2jzgte. id be happy to post the results up for anyone interested, was not a huge difference but it was a difference nonetheless
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