Lyndon Galbraith - New Zealand

[LyndonAE86 NZ]

Yes the 5:3 ratios do wear alot faster, and they will not take much punnishment in reverse gear as they bind up and chip teeth. If you ever have a spin and need to use reverse it pays to not dump the clutch and just reverse slowly with little revs...losing a few more seconds in a rally is better than replacing $1000 worth of parts and ending your rally.

With my old car I jacked up one side of the car and removed axle to fill diff oil. I have researched what is involved for running a diff cooler with the new car but it just seems like more money, weight and work for something that could potentialy cause problems. I think diff temperatures would be much higher in a track car due to the amount of loading with grip when braking and cornering so a diff cooler may be more useful for them.

Regulations for Classic rallying in NZ make my gearbox/suspension/diff options limited...eg the car must have same amount of gears as original manufacturer, diff housing must be Toyota, suspension cannot be coilovers in the rear unless you use non cannister type.
Brakes are free, but engine has to be 16 valve, four cylinder and to the nearest oversize 1600cc bore...we are however allowed to run injection even though the original Toyota NZ AE86's were running twin carbs.

Question: if the standard bore size of the 16 valve redtop smallport is 81.5mm and that equals 1587cc, what bore size would create 1601cc?
As I understand a 82mm bore makes the engine 1627cc??