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It’s supposed to retard the timing when you go WOT, then bring it back in.

so what are the timing values you are seeing, and at what rpm / load?

what is being demanded?

sounds like you just have a terrible tune or none at all.
 
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So you have no tune.

with a turbo, (or any forced induction), the timing needs to be addressed, especially in the mid range rpm, because Load values quickly surpass 100% even as low as 2500-3000 rpm.

If you’re lucky, it’s just “spark blowout” but it’s more than likely detonation that you are experiencing. Or lack of fuel, who knows.

cheap turbo kit + no tune = kaboom
 
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The J4J1 is on the stock tune if it doesn’t have a chip, …. So too much timing and probably not enough fuel.

does he have a FMU?
Does the have any sort of BTM?
A sufficient size injector & fuel pump?

OR just a “calibrated” MAF? 🧐
 
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