Sakura Zero - New Touring Car!
03-22-2010, 07:23 PM
#271
Also I'd like to know if the ball diff uses standard diff rings and diff balls or if it is proprietary stuff. That's one of the features I really like on the Photon is it uses the same diff rings and diff balls as my pan cars.
03-22-2010, 07:27 PM
#272
I don't see how the rollers can work. The different arc lengths one end of the rollers will have to travel compared to the other will make the whole system bind up. Last time I saw Besercoe playing with the little pink thing he had the roller diff in and geez it felt tight.
Yeah that was my fear on the roller system as well. However if they get it to work it should be interesting as it shouldn't need near as much pressure on the diff rings to keep it from slipping. I wonder if it felt tight because he was still adjusting it like a ball diff where it definitely would feel tight due to the different arcs.
03-22-2010, 07:40 PM
#273
The ball diff is essentially same in design to a 416 Diff, just the overall width of it is slighly narrower. So it uses 3mm diff balls, and std large diameter diff plates. The kit ones are keyed to the diff outdrive like a D ring, however the circular Tamiya / Photon style would fit straight on, to allow the ring to slip on the outdrive (i feel this might be preferred in mod to save the diff when it gets hot, but i like the limited slip in spec classes, and it allows you to ru the diff looser without slip. The diff action is extremely smooth after doing the usual sanding of diff plates.
To be honest in most conditions so far i have preferred the std ball diff, i have used the Roller diff and it did feel really good in a mega grippy situation in 17.5, it gave the car a lot more steering, and excellent drive off the corners, however it worked the tires a lot more. It did not feel good when i ran it on a dirty outdoor track, made the rear end too floaty.
RCTERP - There would be more than 1 arc of different lengths, so technically it is binding. How much and its effect could be up for discussion.
To be honest in most conditions so far i have preferred the std ball diff, i have used the Roller diff and it did feel really good in a mega grippy situation in 17.5, it gave the car a lot more steering, and excellent drive off the corners, however it worked the tires a lot more. It did not feel good when i ran it on a dirty outdoor track, made the rear end too floaty.
RCTERP - There would be more than 1 arc of different lengths, so technically it is binding. How much and its effect could be up for discussion.
03-22-2010, 08:23 PM
#275
I have the solution though. I will look into making a couple of prototype parts for Besercoe. I'm sure he will let you know if it works.
03-24-2010, 01:22 PM
#276
Has the car been run on carpet yet , if it has what were your thoughts
Thanks
Thanks
03-26-2010, 11:09 PM
#277
Tech Initiate
Spur/Pinion
Can anyone tell me what spur and pinion the kit will come with?
03-27-2010, 12:29 AM
#279
The ball diff is essentially same in design to a 416 Diff, just the overall width of it is slighly narrower. So it uses 3mm diff balls, and std large diameter diff plates. The kit ones are keyed to the diff outdrive like a D ring, however the circular Tamiya / Photon style would fit straight on
03-27-2010, 03:15 AM
#280
Tech Initiate
Thanks. I wasn't aware that kits don't normally come with pinions. Can anyone recommend a ballpark pinion to suit a Speed Passion 21.5 turn brushless? The Sakura Zero has 48 pitch gears doesn't it?
03-27-2010, 04:10 AM
#282
Tech Initiate
That's a cop out if I ever heard one! There is always a starting point to work out a suitable gear ratio. But no matter, I found a gear calculator spreadsheet which at least gives me somewhere to start.
03-27-2010, 04:13 AM
#283
You obviously dont know much about the current range of ESC's. Gearing is vastly different depending on the ESC and whether you are using the turbo function. Use a "starting point" rollout from a non turbo ESC on a turbo ESC and you will blow either the ESC or motor. Fact of life
03-27-2010, 05:35 AM
#285
Originally Posted by Oggie;
That's a cop out if I ever heard one! There is always a starting point to work out a suitable gear ratio. But no matter, I found a gear calculator spreadsheet which at least gives me somewhere to start.
someone could give you advise
But you could try an fdr between 4-6