"Auto tranny"?

[Baddad]

Has anyone tried one of these "auto trannys" in a crawler? Or in anything for that matter Two Speed Transmission for Associated B44 B4 T4 TC4 TC5 | eBay
Might be great for some wheel speed and slow crawling. Opinions?

 

[lostonthetrails]

I've never heard of anything like that. The little .gif looks interesting. Couldn't find any info on it.

 

[Arctic Fire]

This looks pretty interesting. with a final drive of 1:1 it may be hard to get a gearing combo. The thing would be lightning fast in a wraith after it's in "top gear".. like 90mph fast.

Someone should pick one up just out of curiosity though.. I'd love to see the experiments

 

[CrawlinMike]

I seen these a long time ago online. Pretty pricey. But it'd be pretty cool if it works as advertised and lasts.

 

[Duuuuuuuude]

I don't know that a cvt would hold up to what we would put it through.

 

[SilmarilS]

This looks pretty interesting. with a final drive of 1:1 it may be hard to get a gearing combo. The thing would be lightning fast in a wraith after it's in "top gear".. like 90mph fast.

Someone should pick one up just out of curiosity though.. I'd love to see the experiments

Since the tranny bolt directly to the motor, a 1:1 ratio will not net a increase in speed. You only benefit from the low end with a 1:4 ratio.

You bolt the combo motor/trans to the stock trans of the RC to have the reduced gearing.

 

[gunder463]

i have looked at these alot but havent wanted to waste the money, some one do it and give us a review lol.

 

[2500hdon37s]

basically just a slipper clutch system as I read it. Automatic Transmission question - Page 3 - Scale 4x4 R/C Forums

 

[Baddad]

Sounds like a centrifugal clutch like off a go cart. Darn! I was hoping it would be more like planetary gears or an actual mini torque converter Advertising it as as an "auto tranny" is VERY misleading! Figured it was to good to be true Thanks y'all!

 

[Arctic Fire]

Since the tranny bolt directly to the motor, a 1:1 ratio will not net a increase in speed. You only benefit from the low end with a 1:4 ratio.

You bolt the combo motor/trans to the stock trans of the RC to have the reduced gearing.

Ahhh I see what you mean...

 

[Olle P]

basically just a slipper clutch system as I read it. Automatic Transmission question - Page 3 - Scale 4x4 R/C Forums

I don't think so. A centrifugal clutch has just one gear ratio. There are centrifugal gearboxes as well, that do have 100% drive with variable gearing, and this seems like one of those.
The "problem" I see is that this particular tranny is optimised for use with higher motor revs than we normally use.

 

[Jaketheone46]

Sounds like a centrifugal clutch like off a go cart. Darn! I was hoping it would be more like planetary gears or an actual mini torque converter Advertising it as as an "auto tranny" is VERY misleading! Figured it was to good to be true Thanks y'all!

If it walks like a centrifugal clutch you might as well use the clutch bell off on Nitro it would be similar

 

[Gula]

Those are so 2009. When first released they were around ~45 bucks, rc4wd made a few too. Some that increased speed! I never got one because I knew it won't hold up to anything harder than highway crawling!

 

[slim_chance]

I have seen theses before and know guys that have tried them. The best review i heard was "It is a grenade with the pin half pulled". And that was in a brushed buggy. The torque we use would probably kill it pretty quick. Also i think you need pretty high rpms to get it to shift correctly.