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Old 12-16-2007, 05:32 AM   #1
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Default XX-CR setup help

a friend of mine (racing on a budget as you'll see) recently got back into the hobby and is using my other friend's old XX-CR. We be racin at Pegasus hobbies in montclair and was wonderin if anyone knows what would be a good spur/pinion gear combo with a co27 motor (and misc. other setuo info). I had my co27 in it and it didnt seem to go very fast...

...but that could be the 3000 stick packs, tamiya plugs, and "plug in" (rtr style) motor plugs on what looks to be 14-16awg wire....

but other than get deans, solder direct, etc, what else can my friend do to get it fast again? (including gearing of course).

I got a good idea for the tires since i race 2wd stock and 4wd mod there already. Any help would be much appreciated!
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Old 12-16-2007, 08:33 AM   #2
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The first thing to do is go on www.teamlosi.com and get in to their setup sheets. They have a section for discontinuted models and the XX and XXcr are both supported with a few good setups. I ran an XXcr outdoors a couple seasons ago on a rough track and it handled better in the tough than the newer stuff by virtue of longer rear shocks.

If he is running a stock motor against guys with current batteries he will be slow in terms of speed but that is a non issue if he is trying to learn to drive.
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Old 12-16-2007, 01:46 PM   #3
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the xxcr is still I think a great car and can run with all the new ones, so dont worry cause its old
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Old 12-16-2007, 05:23 PM   #4
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thanks david.




Quote:
Originally Posted by tony montana View Post
the xxcr is still I think a great car and can run with all the new ones, so dont worry cause its old
care to share some gearing tips for a stock motor?
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Old 12-17-2007, 01:17 AM   #5
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Old 12-17-2007, 08:47 AM   #6
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It's probably been so long since any of us ran one that we can't remember!

I think that car's gearbox is a little taller than the current stuff (like 2.14/1). Try 24/82 (or whatever the stock spur size is) and pull the car in @ 3 minutes to see if the motor is hot or cool. If hot, drop a tooth, if cool give it a full 5minute run and see what happens. The Losi site might also have the manual available for down load. The manual will have gearing suggestions in the back.
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Old 12-17-2007, 11:51 AM   #7
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A / B = C (where A = spur gear size, B = pinion gear size, C = External Ratio) Then multiply C (external ratio) by D (internal ratio of the tranmission) = final drive ratio.

So if someone is geared 20/78 with a 2.40:1 transmission and they are using the same motor you are using, you can figure out heir final drive ratio and gear your XXcr the same. 78/20 = 3.9, 3.9*2.4 = 9.36 final drive ratio.
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Old 12-17-2007, 12:59 PM   #8
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well i dunno what the internal drive ratio is, the manual isnt on losi's website...

but its either 2.19 or 2.61 according to the setup sheets that ARE available....
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Old 12-17-2007, 01:20 PM   #9
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The buggy should have the 2.19 tranny. It should be stamped on the side of the case. Here is the set up I have in my notebook.

Front Suspension
Spindles 25 degree
Arms level
1 degree negative camber
30 weight oil
57 piston
blue spring
limiters .090 inside
Steering link in outside holes
Top shock mount number 2 hole out
Camber rod inside on tower number 3 hole out
Lower shock mount on middle hole on arm
Camber rod outside on outside hole

Rear Suspension
pivot support 0 degree
Bones level
3 degree negative camber
Hubs center
35 weight oil
56 piston
pink spring (BK models had pink springs painted blue on rear)
Limiters b spacer inside
top shock mount number 2 hole out
Camber rod inside in 2dn hole out in middle row
Lower shock mount on outside hole on arm
Camber rod outside in inside hole in hub (middle hole if hub has 3 holes)
Hubs centered
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Old 12-17-2007, 01:23 PM   #10
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Quote:
Originally Posted by nutz4rcyktw View Post
The buggy should have the 2.19 tranny. It should be stamped on the side of the case. Here is the set up I have in my notebook.

Front Suspension
Spindles 25 degree
Arms level
1 degree negative camber
30 weight oil
57 piston
blue spring
limiters .090 inside
Steering link in outside holes
Top shock mount number 2 hole out
Camber rod inside on tower number 3 hole out
Lower shock mount on middle hole on arm
Camber rod outside on outside hole

Rear Suspension
pivot support 0 degree
Bones level
3 degree negative camber
Hubs center
35 weight oil
56 piston
pink spring (BK models had pink springs painted blue on rear)
Limiters b spacer inside
top shock mount number 2 hole out
Camber rod inside in 2dn hole out in middle row
Lower shock mount on outside hole on arm
Camber rod outside in inside hole in hub (middle hole if hub has 3 holes)
Hubs centered

cool thanks.
i dont have the buggy with me since its a friends, so it makes it hard to look at the gearbox and stuff etc, lol. But assuming the internal ratio as you said, what would be a good stock motor (p2k2 or co27) spur/pinion combo for a semi-technical track?
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Old 12-17-2007, 01:35 PM   #11
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2.19 is the buggy for sure. The truck has the higher ratio.
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Old 12-17-2007, 01:44 PM   #12
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awesome. Now to figure out a gearing....
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Old 12-17-2007, 01:53 PM   #13
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Default Gearing

My notes say I ran a 23 pinion with 84 spur with a Trinity Monster Stock motor. I would start with something in that range with a P2K2 or CO 27.

Run two minutes pull off and check motor temp, if not to hot your are close; if it is already getting hot, gear down two teeth, cool motor, and test again.

If the track is tight and technical you will need to gear lower number of pinion teeth to come out of the corners stronger.
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Old 12-17-2007, 01:54 PM   #14
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awesome, thanks. Ill let him know so he can try to experiment with it and stuff.
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Old 12-17-2007, 02:05 PM   #15
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Default Hydra Drive

I failed to say that if it has the Hydra Drive, you probably want to remove it. They Hydra Drive worked on very rough tracks but a properly set up slipper works just as well and reduces the spool up weight.
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