|
#1
|
||||
|
||||
DIFFERENT differentials - do you beg to differ?
Back in the 80s we had the gear diffs. Those were quite smooth I thought back then, and practically maintenance free.
Then the ball diffs came (I now know that Cecil Schumacher invented it, and that their logo illustrates just that, thx)... They cost more than the whole car and were much better it was claimed. Can someone do a short story about why this is better? I'm quite sure I read that Serpent is making a gear diff for their S400 (TC), that would be adjustable? Anyone got more on this? Will they try it also in the S500? Personally I think the ball diffs work fine, but they don't last very long. For 1:12 it sucks big time! One single run and it's not smooth anymore... Not far as troublesome in 1:10 OR, but still I find it too much work (I'm lazy by nature). 1:8 OR cars use gear diffs because of the abuse right? Give your thoughts and ideas! Can the ball diff be improved? Can gear diffs be just as good? New and even better solutions? 1:8 TR has a solid rear axle and a front one-way... now that's easy for ya! SMP tried with a one-way in the rear axle many years ago... why? To stop the WHOLE transmission when coasting... Has this been tried in 1:10 OR?
__________________
Life's too short to go slow! www.ymr.no Tech Tips, HopUps & Bling Xray 2014 XB4 4WD & 2WD | B4 FTW Night Fox XL | Mugen MRX-5 | RB | Futaba 3VCS FASST | Faskolor Visit my showroom |
#2
|
||||
|
||||
Quote:
Id like to cut out the maintenance of ball diffs, when they are good they feel great but when they go they're a pain at times. Plus the quality of the chinese AE and Losi stuff is far lower than what the Losi and AE stuff were like back in the early days of the B4 and Losi xxx/xx4. Chris |
#3
|
||||
|
||||
How would you slow the car down with one ways at either end?
|
#4
|
||||
|
||||
The Slide had a brake disk directly on the rear axle They gave it up for 1:8 TR though, too much power so they never got it to be reliable... @Chris: I'd love to try an RC car with a dedicated servo for the brakes! (not legal) You'd operate this with your foot, so you could brake and give throttle at the same time, to keep the momentum through the corner - just like when racing 1:1 scale
__________________
Life's too short to go slow! www.ymr.no Tech Tips, HopUps & Bling Xray 2014 XB4 4WD & 2WD | B4 FTW Night Fox XL | Mugen MRX-5 | RB | Futaba 3VCS FASST | Faskolor Visit my showroom |
#5
|
||||
|
||||
LOL, Disk brakes via a servo dude
SHY guy, that'd be cool - proper toe and heal racing with a buggy. |
#6
|
||||
|
||||
Serpent HAVE made a geared diff for the S400, most of the team drivers are using it and think its great. Its adjustable by changing the thickness of oil in it (same as 1/8th OR diffs). Its only 5g heavier than the ball diff (are there light!) and the people using it much prefer it due to the reduced maintence and much more reliable tuning (its the same everytime you use it whereas with building a ball diff every 3 or 4 races its difficult to get it exactly the same every rebuild).
__________________
Canon 40D (350D backup) - EF-S 18-55 - EF-S 17-85 - EF 100-300 - EF 50 - Canon 430 EX || Speedlite - Canon BG-E2N Grip Adobe Photoshop CS4 Extended AX-10 Crawler - Thats all I have left!!!
|
#7
|
||||
|
||||
Quote:
Your comment is only valid if talking about rebuilding a ball diff with used parts. What tends to happen then is it'll be smooth until the grease is run in, then it'll just be dog rough again. |
#8
|
||||
|
||||
unless you are using a vernier torque meter, it is hard to get a diff exactly the same each time, even using new parts each time, plus the diff has to settle too, which adds to the work, whereas a geared diff, once built, will operate right away, and if rebuilt, with the same oil, will operate exactly the same way.
The only down side of the geared diff, is it removes any 'give' in transmission if you are not running a slipper, hence why the rallyx stuff is well over engineered.
__________________
dragon paints : team tekin : fusion hobbies :SCHUMACHER RACING : Nuclear R/C for all my sticky and slippery stuff - if it needs gluing or lubing, Nuclear RC is the man! |
#9
|
||||
|
||||
Quote:
Also, the comment was made about Serpent cars and Serpent diffs.
__________________
Canon 40D (350D backup) - EF-S 18-55 - EF-S 17-85 - EF 100-300 - EF 50 - Canon 430 EX || Speedlite - Canon BG-E2N Grip Adobe Photoshop CS4 Extended AX-10 Crawler - Thats all I have left!!!
|
#10
|
||||
|
||||
also a geared diff ie 1/8th style, can be run much looser than a ball diff with zero slip
and can also be run much stiffer than a ball diff and 100% smoother win win
__________________
Mattys the driver,my names carl
|
#11
|
||||
|
||||
Quote:
I understand it would need a disc brake but you would have to have them in the drive shafts if you wanted each wheel to be independent Also, i have never rebuilt diffs every few races, i raced open diff cars for years and i only ever rebuilt them after a wet race, a lot of it is down to the grease you use |
#12
|
||||
|
||||
I've often thought with a servo brake it would be quite good to have an xbox style controller with a seperate throttle and brake as triggers then normal steering stick.
Then left-foot braking comes into the equasion! |
#13
|
||||
|
||||
Quote:
I have raced it twice now on one build, its getting raced again then rebuilt, i like to keep on top f the maintenance, would hate to loose and think its because the diff wasnt up to scrath ect.
__________________
Canon 40D (350D backup) - EF-S 18-55 - EF-S 17-85 - EF 100-300 - EF 50 - Canon 430 EX || Speedlite - Canon BG-E2N Grip Adobe Photoshop CS4 Extended AX-10 Crawler - Thats all I have left!!!
|
#14
|
||||
|
||||
AE green slime
|
#15
|
||||
|
||||
__________________
Canon 40D (350D backup) - EF-S 18-55 - EF-S 17-85 - EF 100-300 - EF 50 - Canon 430 EX || Speedlite - Canon BG-E2N Grip Adobe Photoshop CS4 Extended AX-10 Crawler - Thats all I have left!!!
|
#16
|
||||
|
||||
its very good, i also use it on the bevel gears in shaft driven cars
|
#17
|
||||
|
||||
Quote:
I'll give it a try sometime.
__________________
Canon 40D (350D backup) - EF-S 18-55 - EF-S 17-85 - EF 100-300 - EF 50 - Canon 430 EX || Speedlite - Canon BG-E2N Grip Adobe Photoshop CS4 Extended AX-10 Crawler - Thats all I have left!!!
|
#18
|
||||
|
||||
Craig drescher told me about it years ago when we first ran the tc3`s
|
#19
|
||||
|
||||
put my name down for a geared diff,
I always have problems with my 501's diff
__________________
...... KYOSHO ......
|
#20
|
||||
|
||||
Quote:
(oh and im not picking on you ) the best bit off gear diffs, run em in my S400 and all my ic cars bar the 835 which is a mans car with a front one way and solid rear axle. turn,power,go, hang on
__________________
MBModels - Schumacher Racing - Vapextech.co.uk - MRT - Savox - SMD |
|
|