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For regular day to day use and reliabillity on an otherwise standard engine 14psi is about the limit. Correct tuning is very important for reliabillity when you modify an engine. A fully race prepared intercooled TD42 could handle up to double that with correct tuning.
I run 13psi on mine and it has got bigger injectors, and a dyno tune. it hasnt skipped a beat. and there has been times where i have given it a flogging
It also depends on the condition of the engine too. if it has a poor sevice history and is sludged up it wont really handle a turbo at all
Cheers
Benny
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