what timing do 1jzs need under boost?

stevenr816

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Feb 12, 2007
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my cousin is tuning my car since i just got the aem working pretty perfect. and we have the AFRs around 11.5 on WOT. But if i get 8psi or more, it starts breaking up. I changed my plugs and set my gap to .028, that fixed most of it but not all of it. Car does run alot better with the new plugs and it now only happens around 10psi.

He wanted me to ask how much timing these engines need.

Steven