CR01 transmission options

If it uses driveshafts and straight axles, discuss it here.
Want to see your truck featured on the home page? Enter our monthly contest in the general discussion section!
Forum rules
Want to see your truck featured on the home page? Enter our monthly contest in the general discussion section!
Post Reply
Saito
Approved Member
Posts: 33
Joined: Thu Jan 01, 2009 1:42 pm

CR01 transmission options

Post by Saito » Fri Jun 09, 2017 5:57 pm

I'm in the middle of turning my Tamiya CR01 into a 2.2 tire monster truck. The issue I'm running into is the stock CR01 tranny is geared too low. With the biggest pinion it will take, 8.4v, an HPI Firebolt 15T motor and Wheely King tires, the truck still only runs about the speed of a stock Clod Buster on a 6 cell Nimh. Is it possible to run an Axial trans to get more gearing options? I'm leery of throwing a brushless system in it as I've read the axle gears can't handle it. Any suggestions welcome.

ratpower396
Approved Member
Posts: 112
Joined: Mon Feb 13, 2017 6:14 pm

Re: CR01 transmission options

Post by ratpower396 » Fri Jun 09, 2017 6:39 pm

could try fitting an emaxx trans with single motor plate.. may take some fab work but possible..

User avatar
Sixtys Guy
Approved Member
Posts: 1528
Joined: Wed Feb 13, 2013 1:48 am
Location: Tasmania, Australia

Re: CR01 transmission options

Post by Sixtys Guy » Fri Jun 09, 2017 11:58 pm

Not sure if this would be an option; http://store.rc4wd.com/12-Ultra-Compact ... p_766.html

User avatar
andymac0035
Administrator
Posts: 11177
Joined: Mon Mar 29, 2010 9:54 pm
Location: Canaan, NH

Re: CR01 transmission options

Post by andymac0035 » Sat Jun 10, 2017 2:17 am

SCX10 tranny with an 80t (wraith) spur gear would probably give you the best gearing options.
That said, if it were me, I'd just go brushless. Your running WK tires, not clod tires, so the stress on the axles will be a lot less.
You can also tune the esc with punch control and throttle curve settings.

User avatar
andymac0035
Administrator
Posts: 11177
Joined: Mon Mar 29, 2010 9:54 pm
Location: Canaan, NH

Re: CR01 transmission options

Post by andymac0035 » Sat Jun 10, 2017 2:31 am

A CR-01 I used to own. stock axles and tranny. Horrible gear noise is due to me running a 23t traxxas non-metric 48p pinion.
This was before I learned tamiya uses metric 48 pitch... #-o

This truck was running a 60A hobbywing esc and a 3200 kv motor. For what you want to do I'd go 4600 or 5700 kv with a castle sidewinder 3 system, or something equivalent.
Even with this 3200 kv set up and stock tires, which are shorter than WK tires, it moves decently.


Saito
Approved Member
Posts: 33
Joined: Thu Jan 01, 2009 1:42 pm

Re: CR01 transmission options

Post by Saito » Sat Jun 10, 2017 5:22 pm

Cool, lots of options. That speeder unit from RC4WD is priced right and has the easiest installation. An Axial tranny cost about the same as the speeder unit but adds a slipper to the mix, although it will take a little fab work. In the end, brushless is likely the easiest long term solution (and tunable as well) but cost the most. Andymac's CR01 seems to scoot pretty well on 3200KV. I wonder what 5700KV would be like? :wink:

User avatar
andymac0035
Administrator
Posts: 11177
Joined: Mon Mar 29, 2010 9:54 pm
Location: Canaan, NH

Re: CR01 transmission options

Post by andymac0035 » Sat Jun 10, 2017 10:10 pm

Saito wrote:
Sat Jun 10, 2017 5:22 pm
I wonder what 5700KV would be like? :wink:
I think we'd all like to see..... on your truck... :popcorn:

Saito
Approved Member
Posts: 33
Joined: Thu Jan 01, 2009 1:42 pm

Re: CR01 transmission options

Post by Saito » Tue Jun 13, 2017 1:03 am

Well, as an update, I swapped out the Firebolt (which must have been dying) for a 12T Titan and I think the truck is fast enough for now. Its fast enough that I might have to put wheel wideners on it as its a bit tippy in the turns. Glad I didn't have to swap out the trans as I love how quiet and smooth that CR01 planetary gearbox is.

User avatar
andymac0035
Administrator
Posts: 11177
Joined: Mon Mar 29, 2010 9:54 pm
Location: Canaan, NH

Re: CR01 transmission options

Post by andymac0035 » Tue Jun 13, 2017 2:16 am

CR01's have a bit higher center of gravity. Have you unlocked the diffs yet?

Saito
Approved Member
Posts: 33
Joined: Thu Jan 01, 2009 1:42 pm

Re: CR01 transmission options

Post by Saito » Tue Jun 13, 2017 9:13 pm

Yeah, unlocking the diffs was the first thing I did. I rearranged the top structure so the battery is to the rear. I also ditched the cantilever damper/free standing spring setup for standard coil overs set at an angle. I did make sure to keep the swaybar setup however. Torque twist isn't bad at all until you wind it into a tight turn and the inside wheel comes up. It reminds me of how my TXT-1 acted under high power. I guess with the battery and the metal chassis rails being up so high, it would be top heavy. I'm no fan of wideners but I'll give 'em a shot since I have them laying around.

Post Reply
Users browsing this forum: No registered users and 6 guests