RacingEngineering wrote:Also i have used your computations as a guide. Actually i am going to have not 20 Ariel Atoms but 20 Golfs, preferably Golf MK2 (good grip,engine,racing history). And that is why i have reduced a bit tire costs, kept the same fuel costs but increased salary. My computations:
30days/8 hours/20 cars
Fuel=144000GBP
I can tell you from personal experience that a Mk2 Golf (assuming you mean a GTi) will consume far more than 0.5l/minute. My little 999cc engine consumes more than 0.5l/minute. If you want to keep fuel costs to ~60p/minute, then you need to pay less for your fuel or use less of it. Half of fuel costs in the UK are the taxes, so you could look to run cars that use tax-free or cheaper tax fuel. As the cars are not running on the road, could you use red diesel? How about vegetable oil, LPG, propane, hydrogen or electric? The duty on those is much smaller and that's why there's an LPG/propane filling station at Bedford autodrome, which is used to run all the school cars, including the single seaters. Using less fuel can be achieved in a variety of ways but using less powerful vehicles is probably the easiest way. Note that if you're looking to have 20 cars on track at all times, you will probably need 40 cars.
RacingEngineering wrote:Braking=36000GBP (you wrote for ariel but here we have golf, so cost will be even lower)
You won't be running cheap pads if you want the cars to run a long session without overheating, so don't budget on £20 pattern pads!
RacingEngineering wrote:Tire=30000GBP (Golf, not Atom)
This is where an old Golf (or an MX5) really wins with 15" rims. You can fit cheap tyres for £30-35/corner and they'll last a day or two on track. That's cheap tyre costs as bigger tyres or slicks can cost you over £1000/set.
RacingEngineering wrote:Car maintenance=15000GBP
If you can get away with this, I'll be stunned. Things break. You'll get a couple of thousand miles from wheel bearings on a Mk2 Golf when clattering the kerbs on track. You've covered brakes and tyres separately, but you'll need to replace oil frequently and things will break. On top of that, you'll have crashes that mean repairs to cars and sometimes replacements too. A small bump into the tyres that smashes a headlight, crumples the slam panel, dents the bonnet and bends a wing will cost you £500 to fix on the cheap once painted.
RacingEngineering wrote:Salary=10000GBP
That seems low. To take 20 cars to the track, you're going to need at least 3 HGV transporters with drivers. You'll need a small team of mechanics (two should suffice), a crew to sign punters on and do drivers' briefings, some instructors (how much instruction before a beginner can be let loose?), a recovery crew, an ambulance crew and marshals (even using observers and a safety car, you'll need ~15). That's about 30 people, so probably more like £100k than £10k for 30 days. For reference, looking at the signing on sheets, 56 staff were required to run an event last weekend.
RacingEngineering wrote:Tax=20000GBP
No idea where this comes from. VAT? Corporation tax? PAYE?