Well the Supra has broken down! Plz Help!!!

[SupraTT/Iceland]

Originally Posted by pwpanas

How did the piston get destroyed? Oem pistons can old 24psi and 550hp easy...even 30psi and 800+rwhp is no problem...but not on pump gas. The most expensive pistons you can get (JUN/Cosworth) won't hold 24psi on pump gas either, because at that boost level & octane you're not burning the fuel, you're DETONATING it. If it's only the piston that's destroyed, put a new oem piston in there (Toyota should quote you a fair price), run race fuel, and you're done.

P.S. I hope your cylinder wall isn't damaged too...

yes I was on pump gas but this car has always been driven on pump gas it?s a daily driven car.
How much Octane do I need to be safe ? here in Iceland you can buy 98 and 99 octane gas at pumps I think in you standard that would be 94-95 octane

How long can the stock pistons handle 20 psi? how many miles?