Like I posted earlier, I did not notice any difference between the D66 and Brute 66. IMHO, they are the same turbo aside from the thrust bearing. There is so much you can do to a turbo to stuff a 66 wheel in it.
Gotta ask yourself why did Garrett opt to design a different center section (ball bearing) for the 38R? Also the 38R has a ported compressor cover and an equal length blade wheel. The stock turbos have a non-ported cover and unequal length blades.
The 270° vs 360° has nothing to do with the performance (HP wise), it's just for the longevity/life of the turbo.
The turbo wheels for the TP38/TP38 are made by KTS billet turbo wheels, a company out of China. During the development stage of the wheels, Dieselsite kept the version that performed the best and signed exclusive rights of that design. The wheels sold by the other vendors, are the ones that didn't perform as well.
This is first hand info from KTS who I first met at PRI 2013 in Indy.
Like I posted earlier, when I swapped the stock turbo for the D66, it was smokey. I made no changes to the tunes. I swapped to billet 38r 11 blade wheel from Dieselsite when it first came out. Made more turbo whistle, helped with smoke very little.
I then swapped to the Brute when the oil seal went on the D66. I then put the 175/80s in. I got tunes burnt for the injectors/turbo combo from 3 different tuners. All the tunes had the same results....smoke and a VERY lazy spool up. What does that tell you about the turbo? IMHO: the fix is live tuning.
Billy T.
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