Smashed plug on cylinder 4 under boost only

[Edogg6565]

I have a fully built 1g top and bottom with a 60 trim turbo on 23 psi. The car runs and drives fine under normal comditions but when I do a pull in boost is smashes the plug on cylinder 4. Car ran fine during tuning and now does this. If I drive it normal it drives fine all day long. It will only smash it under boost. What could cause this as the motor has no knock or anything.

Engine is knife shaved crank, eagle rods, arias 9-1 pistons, hks cams 264/272, ti retainers, dual valve springs and so on. It's tuned on aem ems.

 

[BogusSVO]

Good deal one the bore check.

Keep us posted on what the injector people say.

 

[dondadda]

Yes, please keep us updated. I would love too see that I am wrong, but please make sure you took a good look, those carbon deposits can fill in the pitting on the piston tops if there is enough there. Good luck!

 

[Edogg6565]

Injectors checked out ok. Going to hotwire the pump since that hasn't been done then check the wiring on the aem. Hopefully the aem doesn't have to be sent off since it was a brand new unit due to a bad injector driver. Also car has literally 400 miles on it so the carbon build up is not much so im pretty sure with a bore scope practically on top of the piston I would be able to see an indention.

 

[dondadda]

any updates!

 

[Edogg6565]

Yep it was a combo of things I believe. voltage regulator was bad in alternator so it was replaced, fuel pump needed to be hard wired, and injectors just needed flow testing as 1 out flowed the others just a bit.