For my pennies worth, spares for vintage cars are not readily available and sometimes not cheap.
Yatton is a great facility but it has a lot of immovable objects like walls and steel pillars etc and when you hit them it hurts the car and your pocket!
If the cars are to fast the likely hood of breakage's is going to be a lot higher than running some sensible motors like a 17.5 or 21.5T.
Its not my driving im worried about, I could easily turn down my EPA and have a very drivable car, its other people with silly motors who are ballistic from one crash to another taking my car out and costing me a small fortune which has happened previously!
Spec racing is also about everyone on a level playing field and having fun based on driving ability and not who has the faster car down the straight! Limiting the motor is the easiest way to get everyone around the same speed without getting into specifying tyes, blinky speedos and all the rest of it. Everyone should agree to turn off turbo functions to play fairly.
OK with some research 21.5t motors are not cheaply available. How about 17T motors, thats an equivalent to an 27T old stock motor and Hobbyking do them sensor-less for as little as £15. You'd spend that on two sets of tyres without even thinking about it.
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