Aup....
The first time I ran my 210 was at Eden Park on their multisurface track (mainly astro) and the 2nd time I ran it was on grass and I didn't change anything apart from tyres and got very good results at both meetings!
In short I always think its a good idea to try your car before 'guessing' on a setup as you may be going backwards! Also, everyone else will be in the same boat so just have a practise and go from there and make your own decisions based on what you feel the car is/isn't doing.
As for comparisons in grip levels etc, unless it rains then AstroTurf is very consistent whereas grass obviously wears out thoughout the day so that's something to take into consideration. On grass I tend to start with a ballistic buggy spike when the grass is still moist and normally end up on Schumacher yellows if it doesn't happen to rain.
Sorry if I'm not very specific, hope the day goes well!
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