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100RON fuel


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I once enquired on another forum about how come my car (IS200SE) was so much less jerky on super than on normal 95RON fuel. The replies I got was that my car (and other IS) was probably tuned for 100RON fuel used in Japan, and hence.

What do you guys reckon?

Do you get much smoother gearchanges when using super?

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Nah, have been running BP Ultra Low Sulphur 95 RON fuel since new. Aside from two tanks of Super from BP, I have now switch to first tank of Optimax. Might stick with it as it has woken up the 'needing 1st service tune up' engine.

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The fuel does seem to make a big difference, I used to use regular unleaded (Texaco), last 2 months I've been using shell Optimax and there was a definate improvement.

Did some tests with the ApexI and found:

Texaco: 155ps @ ~4600RPM

Optimax: 161ps @ ~5000RPM

(this was before the Drager), after Drager:

Texaco: 165ps @ ~4800RPM

Optimax: 172ps @ ~5200RPM

The optimax also seems to have improved fuel consumption slightly (not enough to offset price difference though!).

Not sure of the consequences in terms of engine lifetime but a 6-7ps improvement just from a different fuel is not bad!

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