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

[SupraTT/Iceland]

Originally Posted by pwpanas

The short answer to your question is no. For more detail, read on:

Ime, both RON and PON are useless figures. The only number that matters when you're taking about preventing detonation in a turbocharged engine is MON.

According to these links (and others):
http://www.btinternet.com/~madmole/R...RONMONPON.html
http://www.zeltex.com/eval.html
...the MON of what's referred to as 'premium' '93 octane pump gas' in the US is approximately 88. Ime on 88 MON 'premium' "pump" gas, you can boost to about 14psi without the Mkiv Supra Turbo's oem (unmodified) ecu detecting knock and retarding timing. 15psi is boarderline; at 16psi knock is clearly detectable and timing retard starts to occur. Every time you boost over 16psi (without some form of effective octane suppliment, as listed in my previous post), you risk engine damage.

I?m trying to get a hold on one of the previous owner because I know now that there is a another ECU in the car it?s not Stock. Much more gas flow. But I don?t know what kind.
But one thing is weird this car has always been over 20 psi with no problems but maybe 26 psi was just to much. I?m trying to get more information about what exactly has been done.