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I am getting my blown T66 with 0.7 ar and p trim rebuild as we speak. I am upgrading the compressor wheel to a T72, and the shop is recommending to have the exhaust side clipped by 10degrees. I have done quite a few searches here and on the web. It seems that clipping has a similar effect for increasing the ar. A 10degree clip is considered a mild clip. Their reasoning for the clipping was that the T72 would be benefit more from a like 0.81 housing and instead of buying a new housing, a 10degree clip would give the same performance by reducing the exhaust flow at the higher boost/rpms. Any opinion or thoughts on this?
 

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well what goes in must come out. Clipping helps to exit the exhaust gases faster. Instead of clipping the p-trim wheel, I would say get a Q trim. The P will max out before the 72 wheel maxes out and will hinder the performance of the turbo.
 

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I agree with spoolin...the p trim wheel is way too small. Even the q trim is on the small side.

Daniel
 

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Discussion Starter #4
But doesn't clipping the exhaust side provide a similar advantage of having a bigger wheel or larger a/r?
 

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Clipping allows more flow to pass the blades. We do it on the Cummins stuff alot. It's effective in controlling EGT's, but a bigger hotside will be ideal. The 72w/.81 A/r is what I run, and love it. Get the Q trim and .81 A/r. Don't bother clipping a P trim.
 
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