Quote:
Originally Posted by Tedor
Thanks again! 
What is the max boost that the stock Euro spec turbos can handle? Trying to figure out boost vs fuel octane. In sweden we have 95 and 98 octane, unfortunaly the car haven't been driven here, only 5 miles if the seller is correct. Not sure what fuel octane England are using. |
No idea. However:
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.