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Yokomo MR-4 TC Thread

Yokomo MR-4 TC Thread

Old 01-26-2015, 08:54 PM
  #2851  
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That should fit ok, thats the equivalent to 72/39-40T. If it doesn't you may need to go down in the spur.

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Old 02-06-2015, 10:47 PM
  #2852  
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Well it didn't fit..

I figured out a 48p 78/30 combo is the max I can fit and 78/22 is on the low end of the range.

Based on that I made this chart for 48 and 64p .. Does this look reasonable?

I think I need a 86/48 for 3.94 and I can get to 3.57 with the 53t pinion I already bought.

On other topics I blew out the glued one way.. It's been replaced with a ball diff now. I also picked up a few spare parts. More arms than I know what to do with
Attached Thumbnails Yokomo MR-4 TC Thread-chart48p.png   Yokomo MR-4 TC Thread-chart64p.png   Yokomo MR-4 TC Thread-dx1mbzb-1024x448-.jpg  
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Old 02-07-2015, 03:01 PM
  #2853  
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Yes you would need a smaller spur than a 78 to get the gearing. Nice spares collection!! I thought I had a lot
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Old 02-07-2015, 03:01 PM
  #2854  
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Oh yeah, what exactly failed on the glued one-way diff? Did the glue not hold?
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Old 02-07-2015, 11:01 PM
  #2855  
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I'd feel better if I had more steering and camber blocks and less arms

That camber block shouldn't have broken with that little hit it took but the PO had carved the webbing off the front of the block and took all the strength out of it.

On the one way the out drives keep breaking loose. The glue isn't holding..

Maybe if I rough up the shanks before gluing it..

The ball diff is working well for now.
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Old 02-07-2015, 11:21 PM
  #2856  
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You should find C hubs on eBay from time to time, just look regularly.

I'm not sure of the glue you are using but I used industrial strength glue that cost $25 for a small bottle and so far it's been good

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Old 02-19-2015, 10:38 AM
  #2857  
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Carpet season has wrapped up..

We survived the last night without a break down.. YES!

One of the guys there was nice enough to run through the suspension on his setup station and we got it dialed in fairly well.

The track operator brings in a mini store in a trailer.. Honestly he has a better selection of parts for touring cars then my local hobby store..

I got lucky and found a Kimbourgh 86t 64p spur and 48t pinion on the rack..
I haven't had time to tear it down and see how it fits.

Plans for the summer are get the gears and 25.5 installed.
Buy VTA wheels and body..

I also got a few more parts from the PO. a set of new aluminum front arms, aluminum C blocks, aluminum rear hub carriers and a spare set of king pins.

I wonder if those aluminum SD steering blocks on Ebay would fit..
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Old 02-19-2015, 12:27 PM
  #2858  
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I have a TON of MR-4TC parts if you want them. PM me if you're interested and I'll get some photos of the cars and parts.
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Old 02-21-2015, 11:23 PM
  #2859  
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You can fit SD steering arms with SD 'C' uprights. You can also fit SD rear uprights.

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Old 04-09-2015, 07:03 PM
  #2860  
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Going to try n get mine up n going again.
How powerful of a motor dare i run? Really just wana have fun and build up the 4 complete cars i have so the kids and i can "race"

On the other hand.....
What would a complete stock roller go for? No body.
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Old 04-10-2015, 12:51 AM
  #2861  
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These cars were originally designed to handle down to 8 ish turn brushed motors running old 6 cell packs. Todays equivalent would be 13.5T brushless running in Blinky mode. You could run bigger power, which I have, but you would want the steel diff outdrives from the offroad cars.

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Old 04-10-2015, 08:10 AM
  #2862  
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I was running 17.5 brushless.. It's getting a 25.5 so i can run VTA
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Old 04-12-2015, 03:44 PM
  #2863  
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My car makes a horid screaching sound when its accelerating, even gently acceleration. Any ideas what it could be? Car has very low hours on it. just re greased the rear diff. Could the diffs be slipping?
How tight do i make the diffs?
When i tried to get it to do a "burn out" by putting the bumper against my foot and hitting the gas the motor turned but not the tires....
Thanks for your help.....
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Old 04-12-2015, 04:09 PM
  #2864  
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Yep, sounds like the rear diff could be loose.
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Old 04-12-2015, 06:47 PM
  #2865  
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Any of you guys interested in the 1/12th scale version of this car, the mr4tc-mini? I have a nice chassis, no wheels n tires or body at this time, it has one but the guy I got it from has yet to bring it to me. If interested pm me.
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