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Old 09-17-2007, 10:36 AM   #1
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Default JRXS-R w/ LRP TC SPEC brushless? need help

what sre the part #'s for the stuff you need to make a brushless fit in to the jrxs-r? I knowyou need a bigger spur gear but what one? I no nothing about touring car but the local club is putting together a carpet track So i just bought a jrxsr and the lrp setup. any help would be great I'm a nitro offroad guy that found something to do this winter. any info on what tires or traction compount would be great if possable includ part #'s I will get betting at the TC stuff if I'm luck by the time winter is over
thanks in advance
tony
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Old 09-17-2007, 10:59 AM   #2
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Quote:
Originally Posted by tdeal823 View Post
what sre the part #'s for the stuff you need to make a brushless fit in to the jrxs-r? I knowyou need a bigger spur gear but what one? I no nothing about touring car but the local club is putting together a carpet track So i just bought a jrxsr and the lrp setup. any help would be great I'm a nitro offroad guy that found something to do this winter. any info on what tires or traction compount would be great if possable includ part #'s I will get betting at the TC stuff if I'm luck by the time winter is over
thanks in advance
tony
brushless fits fine in the type r , if you are running a 3.5 motor you may need a bigger spur like a 130t or so and you may need this adapter

http://www.precisionracingsystems.com/products/17
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Old 09-17-2007, 03:35 PM   #3
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thanks I got the 4.5 motor, I might get one for a tuning option anyway. I here people talking about motor temp and over all gearing of motors alot. I'm all new to the electric stuff, I'm use to nitro and I understand that an engine that is to hot is not an efficent one. Is that the same for electric motors? to much load one the motor? How do you calculate the gearing? On the jrxsr page I see it posted alot for the 10. - 8.0 seams to be an average. But you can look and look and there are way to many pages to find the info you are searching for.
any light shed on the topic would be great
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Old 09-18-2007, 03:30 AM   #4
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any help on the gearing stuff would be great thanks
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Old 09-18-2007, 01:39 PM   #5
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Hey bud. With my limited experience with brushless, I did the same as you, asked and listened. You'll find it much easier to learn at the track once yours opens.

Sensored brushless motors will "thermal" at some temp above 200'F. In other words, the speedo will shut down when it sees motor temps hit a preset value. You've probably got a temp gun from your nitro program, bring that with you and temp the BL motor after every run. Fiddle with gear ratios to get as close as possible to the appropriate ratio that your motor/track-layout calls for, and use the 200'F mark as a high point.

Since I just got into BL as well, I'd be keen to hear what temps others are seeing and feel safe running at. I chose 200'F after hearing about a 225'F meltdown from another racer with the same motor that I have.

p.s.-Don't forget to set the lipo voltage cut-off on the LRP Sphere! It's there for good reason.

Last edited by Greg Sharpe; 09-18-2007 at 01:41 PM. Reason: p.s.-I forget stuff
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Old 09-18-2007, 06:55 PM   #6
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thanks for the info. I will do my best to remember to post the info and gearing changes.
As far as the over all gearing what Spur and pinion should I start with or have on hand?
thanks again
tony
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Old 09-19-2007, 03:13 PM   #7
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I can't help with gearing the faster motors, as I've only run the 10.5. Shoot Todd Hodge an email (see teamlosi.com for email addy) and tell him the general track size and motor size you'll be running ... -OR- just post that question in the JRXS-R thread here on RCTech!
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