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Old 10-01-2011, 11:22 AM   #15
rockin' the toaster
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Joined: Jul 2007
Location: sunny SoCal
Oddometer: 2,292
Originally Posted by _cy_ View Post
... does anyone know if slightly higher compression engine 9.5 to 1 still will run on regular?
You'll likely get good responses on this.
My take is no, not very well... better if you retard the timing.
You might give it a try and see if it pings (which it probably will, especially under load/hill climbs), but much pinging would be quite detrimental so go easy.

Pretty sure our current premium is lower than the factory recommended octane for your R90S but I don't have the operators manual on hand.
in other words, best to run the highest octane available.
"If you want to fix it with a rock, you have to stick to stone-age technology" -Anton
"...solving the latest crisis that is preventing my Airhead from taking me to the bar." -Beater-
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