it's nothing to do with timing yourself lads.
Simply by driving on it now, you're breaking the law, it's illegal, you're uninsured, and you risk EVERYTHING you have.
You don't need to be going fast to have an accident, coolant and fluid spills are everywhere.
If you don't know the track what's to say you'll be able to stop if there's a down'd biker in lying in the middle of the track? even if you are on a leisurely cruise? Who's to say you won't develope an oil, Powersteering fluid, or coolant leak on your leisurely lap? Driving fast has NOTHING to do with those things, yet the risk is just as high.
Sorry to **** on the bonfire chaps, but driving your OWN car on there now is utter madness and I'd stongly urge anyone considering it to forget that thought.
Go to the Ring by all means, it's the greatest place on earth for a petrol head, there really is nowhere better.
Soak up the atmosphere, enjoy the beer and the cars, but if you want to go on the track, either cough up £400 for a full days open pitlane day where 3rd party risk doesn't apply, or rent a Swift from Rent 4 Ring, because the chances are it'll be FAR more suited to the ring than your own car anway, and you're fully insured and legal.