Vinyard

Me! Me! but i like to ask is i mix 30k/10k does it really gives me
20k or somewhere along that line?

Because I am unable to get 20k diff oil..

FREAKAH

I use 15,000-20,000 with excellent results. Lots of steering on a tight track with rubber OR foams.

FYI, I have 5,000 in the rear.

Manticore

Hope so !

Racing4Evo

iTrader: (2)

Ahh man, you don't need to do that to the clutch. We are using centax clutches now. That is what the spring and spring keeper(unless you have a better term for this) are for.

Corse-R

On electric cars there's a myth about same ratios with different pinion/spur combos that some people seems to apply with success.

On large tracks where you need lots of high speed, use the larger pinion/spur combination, this yields more inertia to the transmission and allows you to be slightly faster, but hampers slightly the acceleration (when your engine needs to move more weight, needs to apply more torque (and in this case, is rotating weight).

On smaller tracks the same ratio with smaller pinion/spur combo is more related to acceleration (due to their rotating mass).

In our cars you have to choose and see if permits to mesh correctly to the 1st gear, if all two meshes, much probably I'll choose the larger combo on a larger track, but this is going to finetune the car up to a level that probably you need to pass each lap by the same place, braking ever on the same place and accelerating as needed to see any difference (and probably is something like 0.01 or 0.02 secs).

I told the theory behind the same rations on different pinion/spur combos, you need to try for yourself and see if worths to you.

RClover

assuming the power is constant on my motor, will changing the pinions to 16/21 47/43 better than 16/20 47/42 or vice versa?
i am a little lazy to change the pinion.

RClover

ok...used the dino ratio calculator.. here's what i have.

assuming the tyres are 64mm (front/rear) with stock pulleys.

16/47 = 7.4210
20/43 = 5.4315

if change pinion to 21T,
16/47 = 7.4210
21/43 = 5.1729

if change spur to 42T,
16/47 = 7.4210
20/42 = 5.3052

from the above, changing the pinion to 21T will gain better top speed than changing to 42T, rite? but probably at the expense of sluggish when kick into 2nd gear (if 21T pinion is used)?

Corse-R

Depending..... with a 16/21 with 47/43 you have a final ratio of 7.421 on 1st and 5.173 on 2nd gear. With a 16/20 with 47/42 you have 7.421/5.305 so it's shorter.

Moving one teeth on the pinion is much larger than moving a pinion on the spurs as we do usually on electric cars.

Corse-R

You have self answered your question.... Usually use the 21 pinion with 43 spurs, only go with 42 spur to cope with the different tyre size trying to keep the rollout at par as tyres get smaller (as many others do).

RClover

so the new belt conversion will solve the rollout problem without having to use 42T?

Corse-R

Not solves completely but alleviates the rear tyre wear problem.

RClover

are you on 40/40 shores? with a 3mm split with 363mm belt now?

Corse-R

Last day I tested it was running on 42/42 and tyre wear was almost even with a 3.5mm.... Key to this is going with a 3 to 3.5mm tyre split (depends on your driving preferences).

Yesterday did a full 45minute main simulation and tyres ended much better and handling was much better than with no split tyres configuration (last 15 minutes were a real nightmare in handling terms.... too squirrely and too nervous at the rear end).

16/19T conversion will solve the problem of uneven tyre wear, not solves a rollout problem (rollout variation is intrinsic of foam wear and diameter decrease of the tyres).

Running with foams will make you to pay attention to the diameter of your tyres and change gearing accordingly to the diameter of the tyres.

dino.tw

Anybody called me?I heard someone called my name....

21.5T ?? It's EASY CASE really!
Use one 22T and half-break one tooth.

mistercrash

iTrader: (5)

Thank you very much for the quick response. I know it's a pain to repeat the same thing over and over again But these threads are getting so big that it's sometimes difficult to find answers by searching for it. Anyway! I love this thread And I can't wait to get my MTX3. I'm sure I'll have as much fun racing it as I did with my MTX2. Maybe even more.

Thanks again