and as I have far too much free time, a few more things to think about, Rally is my 1st love, so its what I know the most about....
tyres, prices arent as cheap as you would hope for, but have a look at :
http://www.palmside.co.nz/tyres.asp?supplier=ALL&size=ALL&surface=GRAVELfor an example of prices.
Dunlop Direzza's are still the preferred choice it seems, as for example at last weekends Rally Wairarapa (included fields from Group N - ie NZ Rally Championship as well as Central Regions and also Rally Extreme) totalling 80 odd cars, I spotted about 5-10 cars not running Dunlops... Even though Silverstone sponsor one of the classes! So I figure there must be a reason they are preferred!
With tyres, there is always the option of second hand from trademe. But I would suggest inspect them 1st before buying!
Next, LSD.... Does the car have one? I realise it wont be important at this stage due to the power level of the car (well it wont be too bad on the track at least!) but on gravel you dont need much power to find a one wheeler is a real pain when trying to get out of a corner! You may want to consider a locked diff for gravel and track use?
then what about underbody protection were you planning? Sump guard is a good start, but remember you dont want stones hitting things like your gearbox, driveshaft, diff or fuel tank either.... You may want to find out who builds/prepares rally cars in your area and drop in and ask them what sort of underbody protection they would suggest and what people normally put on their cars. Another great way of getting tips with this is to approach members of your car club who rally, they generally are quite happy to help out someone joining the sport and give advice.
One thing to bear in mind in regards to under body protection is this from the manual:
"Fuel, Oil and Brake lines and Brake
cables: External lines and cables shall be
protected from damage (stones, corrosion,
mechanical breakages, body flex, etc.). Internal
lines shall be protected from accidental contact.""
And another thing to think about:
"Mud-flaps: Except for complete Tarmac
Events, all competing vehicles shall be fitted
with mud-flaps covering the width of the rear
wheels and the driving wheels.
The mud-flaps shall;
(a) Be in place at the commencement of
the first special stage and following every
service, and
(b) Extend either side of the tyre width by
at least 50 mm, and
(c) Have a ground clearance of 50 to
100 mm when the vehicle is stationary."
Ive got lots more things in mind, so I will post up more things when I have more free time, but feel free to say if this is all stuff that you know or there is anything particular you want to query.
Ive also copied the fire extinguisher details from the manual and will add that in a minute too for you.