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Old 03-14-2013, 12:53 PM   #212
Scooby Specialist
Member#: 193757
Join Date: Nov 2008
Chapter/Region: MWSOC
Location: Cedar, MI HP Techs MPS-SSLR2.5
2006 XTI Limited
OBP, Junior tuned 573WHP


Originally Posted by KillerBMotorsport View Post
Likely not

^ That may be true, but that's because your target boost is lower than peak boost at those RPMs. Tuners do this for one of several reasons. Now if you're running a manual boost controller (which would be a great apples to apples comparison) it will not open one bit until peak boost, that it's set to, is reached but that brings along with it the whole PTFB debate

I share a different opinion on WG size. I prefer the smallest needed for an application, which for Subarus is generally 38mm. The smaller the WG the better the fidelity, or more precise control. It's always easier to regulate a prices amount of flow/volume from a smaller valve than a bigger valve.
I was referring to the bigger and more efficient external gate vs. the internal gate. There are 2 schools of thought on the gate size for sure depending on your turbo size and boost levels you are running.

I'm with Kelly on the PL of the internal gate and EGBP. Also the turbulence caused from the traditional SL Subaru internal gate does not help!

Bottom line is that your LM kit with the EWG and smaller turbo has big advantages over the SL bigger IWG turbo with regards to spool. A better comparison would be same gtx3071, same gate, low mount vs stock area rotated location. I know your LM will spool faster but how much more would be nice to see!

My position is that the delta or differential as a percentage in spool characteristics between the turbo locations your LM to SL rotated will get larger as the turbo size increases!
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