Just rebuilt my cossy YB motor, nothing special rebore with wossener pistons head light skin and the block decked to give 8-5 to 1 compression ratio. The 350 kit from BHP and rebuilt turbo T34 from BTN. But when it comes on to boost approx 2700rpm the noise starts. I thought it was the vanes in the turbo catching on the case it's that sort of noise, take your foot of the gas and the noise spools down just like a turbo would. Stripped turbo down with the OK from suppliers cannot find any thing catching within the housings. Would the compression ration at 8-5to1 cause detonation? Car starts fine ticks over fine. To stand and Rev the engine you can hear a slight similar noise but nothing like it is when it's under load. Any ideas
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