3 or 4 gear cr2

[adey]

i have an atomic cr2 and I have a normal 3 gear transmission with the external idler conversion and a 4 gear gearbox for it. The only difference in terms of mechanics is the position of the idler. The motor spins in the same direction using either gearbox but the layshaft spins in different directions dependant on which gearbox I use. The effect on handling is dramatic and as I stated the only real difference in the direction of rotation of the layshaft. A lot of other cr2 owners agree. Opinions please ! If the layshaft spinning in the same direction as the tyres makes the car better why do all other manufacturers use 4 gear.

[OldTimer]

Steel layshaft and a slipper assembly is a lot of rotating mass, so yes it has more effect than people think, i have already done some work on the S2 Evo with a 3 gear gearbox with spur idler

It will be interesting to see the effect it has on the C4.1 / S2 Evo.

[adey]

Does anybody know if other makers have tried this.
Also does anybody have the motor plate and idler conversion for sale ?.

[rcjunky]

With my PSI car the 4 gear tranny was better, but its because the motor was sitting farther back more so then what masses where spinning, other with the same car said it got worse with the 4 gear tranny, I guess it would be best to try the 2.

[Wacker 2]

Originally Posted by OldTimer

Steel layshaft and a slipper assembly is a lot of rotating mass, so yes it has more effect than people think, i have already done some work on the S2 Evo with a 3 gear gearbox with spur idler

It will be interesting to see the effect it has on the C4.1 / S2 Evo.

I'll be very interested to see how that goes.

And Adey, you know my opinion - 3 gear box with external idler gear all the way! Possibly not the 'fastest' on a one lapper but far more stable and consistant... much easier to drive a full race with no mistakes.

The reason I got rid of my C4.1 and went back to my CR2 was because the C4.1 felt wably and unstable - it reminded me of when I tried the 4 geared box in my CR2 last year and I didn't like it. If Jonathon @ AC makes the new S2 Evo available with a 3 gear box and external idler gear I may be interested at trying it again

[adey]

As Jonathan stated its down to the rotating mass of the layshaft and slipper assembly. Makes me wonder about the brass flywheel for the x factory x6. Must of made a huge difference.

[arransmith27]

I've driven a 3 gear cr2 (adey's) and my own 4 gear x6 squared (on carpet)

I felt that adey's cr2 was a much nicer drive.

Is my understanding correct in thinking that 3 gear mid motor is intended for slightly slippier conditions, and 4 gear for higher grip levels?

[adey]

It is worth mentioning that with a 3 gear cr2 the motor is spinning in the same direction as the layshaft. That must change things as well.

[rcjunky]

Originally Posted by arransmith27

Is my understanding correct in thinking that 3 gear mid motor is intended for slightly slippier conditions, and 4 gear for higher grip levels?

The opposite, 3 gear mid motor is for more steering when you already have enough rear grip, so high grip situations.