Hi All,
I was originally toying with a five speed gearbox for my Kent engined 4/4 but think the easier route may be to alter the differential ratios about to give the car more cruising legs. Currently the car has had the engine tweaked (Stage 3 head, Kent 123 cam, lightened flywheel) and puts out 106bhp. I can't find anything in the paperwork to suggest that the differential has ever been apart so I assume it still has its 4.1:1 differential from the factory. The car does 4000rpm in fourth at seventy mph (on the speedo).
There seem to be other pinion and crownwheel sets available from the likes of JB Sports Engineering etc, but can anyone in simple English explain by how much fitting a different pinion and crownwheel set will alter the ratios? Ultimately I'd like the car to cruise at 70mph doing something closer to 3000rpm. Is this realistic? I realise it will lose some acceleration in making the changes.
Someone please help the confused dunce
