[Supras] Mystery Knock? (related to high rpm shifting?)

[Rockey Fox]

I frequently shift at 6500 rpms and did pay for the rotating assembly to be balanced during the rebuild. After a year now I do detect a slight knocking when I boost (even 2psi) before the engine reaches operating temp. There is absolutely no detectable knock under any circumstances after operating temperature is reached.
I did recently upgrade the compressor to 57 trim on the CT-26 and I limit boost to 11psi on the stock ECU and injectors, FIPK and 3" exhaust from turbo via a defcon downpipe and crinkle bent (already on the car when I bought it) exhaust.
I'm leaning toward wrist pin more than rod bearing noise but I won't really know until it breaks. Any other ideas? I didn't bore or replace pistons during the rebuild.

Rockey 91T 




__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com