Merkur XR4Ti ??

[twinturbo]

Originally Posted by alga

Hmm, I think the strain on the gearbox depends on the power (torque * rotational speed) being transfered though it, not the weight being moved or anything else. The torque, though, is limited by the grip of the rear tyres, which is directly proportional to the weight on the rear axle. I wonder, what is the practical limit of torque/power that can be put down on the Roadster with semislick tyres like R888?

It has been discussed several times on here that 160-180 bhp is the limit for a Seven type car beyond where there are diminishing returns from extra power. Perhaps that is the limit of typical road tyres with the roadster's weight?

Put the same driveline in a car weighing 45 tones. Will the gearbox survive less well than in a car at .45 tones.

The torque required to accelerate the heavier load is much higher.

TT