08-10-2012, 05:08 PM
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Supra Owner
Join Date: Oct 2005
Location: GA, USA
Posts: 2,209
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Quote:
1) Motor octane is MUCH more important than research octane. You have to find out how the octane of your local "98 octane" fuel is measured, and it's *motor* octane number. 2) With a US-spec Mkiv Supra Turbo, the max safe boost with local 93 octane fuel (calculated at ((R+M)/2)) is about 16psi. Anything more than that gradually destroys the engine (not the turbos). 3) With the US-spec Mkiv Supra Turbo, the oem boost level is about 11.5psi. This of course is very safe with the recommended 93 octane 'premium' fuel. 4) The turbos won't die quickly unless you're running in excess of 28psi. HOWEVER at anything over the stock boost levels, their longevity will be impacted. The more you push them past the oem boost levels, the quicker they'll fail. 5) Again, (I can't stress this enough) the engine is what gets damaged FAST with high boost on pump gas - not the turbos. If you're going to run high boost, use race fuel or methanol injection.
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Phil '94 Supra Turbo, 6spd, 'APU'+ Displacement is no replacement for boost. Life begins at 30psi. NB: Please consider posting any help requests in a new thread instead of asking me for help privately. About 99.9+% of the time, private help requests end up covering great information that could be very valuable to other forum members. If you have a good reason for needing the help request to be private, I'll consider it. If not, then why not give everyone else the opportunity to pitch in too, and/or learn from the information? Remember, there's no such thing as a dumb question. We're all here to help within this family of Supra owners. |
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