I've run 6 and 7, and really, cannot tell any difference! - engines fly with either ( once the tune is right) - Fuel wise, I have used sidewinder 16%, works great..( you can get that there??)


I had a look at your track pictures - fairly small eh?

I'd be gearing pretty low as to allow the engine to get into its power band - 16/61 - 21/56


BTW, which pipe do you run?. - As far as I'm concerned, it's the Sirio 2611 or nothing, simple as that..

Oh, and don't worry about it screaming, they love it!