Gearing for rc12r5

Can someone please advise on gear ratio for 9T/60A hobbywing with A123 at wan chai track.
thanks!

I never knew you could play 1S A123. I expect you have to have a very faster motor for this.

I intend to play 2S A123. As far as the rear tire diameter... i cant answer this yet, depends on what Fatboy delivers! I'm really looking for a rough range to start out with and slowly fine tune.
thanks hardmankam.

thanks hardmankam.
I've ended up playing my r5 with 2s lipo from my 1/10 cars, as my old lipo's dont have enough punch anymore for 1/10, but more than enough for 1/12. Just did a little modify to fit the 1/10 lipo running 22/96 and 9T. Whats great is that the batteries last for a very long time 4,200mah, but the top speed too fast for me to play full throttle at wan chai track, therefore i set  the forward throttle to 70%.

Initially i just used small cable ties through the battery mounting holes, but this limited the chassis clearance to the ground. so then i came up using a larger cable tie with a hole drilled through one end to clamp it to the chassis at the front, using the smaller screws/nuts that come with the r5 for the battery bracket. At the back I used some posts (i think come from L4 or RC10LS), this limit the battery movement and act to secure the cable tie with a screw through it. On the bottom I used some foam(sticky on one side), (easy/cheap to find from shops - wanchai got one near track) to raise the battery so it doesnt effect the links. Also needed to raise the shock a little...2mm is enough at front, back of shock doesnt actually need to be raised at all.

I'd be interested to see how other ppl modify their r5 for 2s lipo.

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2s Lipo in Wanchai, 18/100 with 8.5turn brushless, rear wheel 44mm diameter
can be full throttle wi ...
swswsw 發表於 2010-4-9 10:08

                               
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Hi swswsw,
thanks for the info. I was worried before about correct gearing/over heating etc before which is why i ran 22/96, but these 1/12 dont seem to be so fragile to run as 1/10 so I will try 19/96. because these 1/12 so light seems you can get away with pretty much any gearing you want. Will let you know how i get on. (will play Sunday at wanchai!)

thanks guys...
if it helps anyone else out... then great!
Definitely makes it a cheaper option if you already play 1/10 and want to play the 1/12(r5).
I was struggling for a while as I didnt want to have to fork out for 6 lipo batteries for the 1/12.
Now my old lipos dont go to waste, but i think, after these lipo's die, i will go A123 for all my rc cars. Then i suppose i can just remove the foam.

hardmankam... u gonna make it down to wanchai this sunday?

swswsw - Am i right in thinking i recognise your car? u often play in wan chai?

yes quite often previously, except these few months vocation period...
swswsw 發表於 2010-4-11 07:39

                               
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swswsw - Haha! i know you! Do you know who i am?

lucky u didnt play today... track very very wet! we all left early for some food!

lky2000! better get ready for me at PYC. I  take no prisoners!

My R5 setup is now
tire diameter: 47mm
pinion/spur: 20/96
motor/battery:9T/lipo2S

I can only play with the throttle set to 70% on the wanchai track.
I actually wanted to buy a 17T and 18T to try out, but the Spec-R brand 64P doesnt have these sizes, are there any similar pinions with these sizes. I like the Spec-R ones as they have 4 grub screw holes in the pinion... good if you strip the thread in the pinion.

Hi Hardmankam,
I don't get it. If i change the pinion to 17T from 20T, then my rollout will be 26 instead of 30. surely there would be a decrease in top speed if i left the throttle at 70%.
Are you saying that difference in top speed would be negligible?
As u guessed...i'd prefer to have the throttle at 100%, or at least closer to 100%.
I kinda based my theory from swswsw's post, where he is using 100%throttle,8.5Tmotor, 18/100 for the wanchai track.

I broke the carbon fibre shock holder! Can't find it anywhere in KWS...
I'm gonna try a 18T instead of the 20T pinion to see how much i can increase the throttle once i find the part. Can't fit my 2S2P-A123 in my r5...

R5 FT Upper Pod Plate can be found @ 友邦 or 1/F
chestertai 發表於 2010-6-25 19:16

                               
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Not pod plate.... i broke the small carbon fiber part connect the front of the shock to the chassis... "Front Shock Holder". I checked in 1/F,  友邦, all the shops... no stock!