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JRX-2 mid-motor oval racer

Posted: Wed Sep 05, 2012 9:52 pm
by dldiaz
This is a converted JRX-2 that I have had for several years (I got it off eBay, years ago).
- The transmission is reversed (for mid-motor arrangement), and the motor-plate has been switched back to the right-hand side (so it does not require reverse rotation motor). The rear shock tower is mounted at the very back, with shocks now behind the a-arms.
- The front uses RPM arms, mounted backwards; and pan-car steering setup with a mini servo. The front shock tower is lowered/cross-braced, with the shock ends bolted directly to the caster blocks (shocks in front and camber links behind the caster block with one long bolt).
- Electronics include a Novak XXL receiver, Novak GTX speed control, Novak 45-turn crawler motor with 30/84 gearing (runs all day on a 2300mAh battery), and a Futaba S9601 mini servo.
- Losi rims (orange) with foam tires.
- I forget the make of the body (I have one other Jerk with the same body).

This setup handles really well on pavement, I have never had the chance to run it on a real oval track.
Losi JRX-2 (mid-motor, lowered) 2.jpg
Losi JRX-2 (mid-motor, lowered) 9.jpg
Losi JRX-2 (mid-motor, lowered) 6.jpg
Losi JRX-2 (mid-motor, lowered) 7.jpg

Re: JRX-2 mid-motor oval racer

Posted: Thu Sep 06, 2012 8:15 am
by kfeldt
Cool project!

- Keith

Re: JRX-2 mid-motor oval racer

Posted: Thu Sep 06, 2012 10:14 am
by License2iLL
Really like this different arrangement. Very nicely done.

Need brighter pics higher resolution. Nice craftsmanship.

Re: JRX-2 mid-motor oval racer

Posted: Thu Sep 06, 2012 1:26 pm
by LTO_Dave
Very nice! This reminds me a lot of the buggies that I used to race with years ago on carpet oval.

Re: JRX-2 mid-motor oval racer

Posted: Thu Sep 06, 2012 1:51 pm
by dldiaz
Sorry about the lame pics - iPhone is all I have...

Yes, this was for carpet racing - before the carpet track shut down, we used to run around at like half-throttle just dicing with eachother for fun!

I thought about having a 45-minute ELECTRIC race, as kind of a joke to see who could make the run time... Hence the crawler motor in this thing.

But, alas, no carpet racing in South Texas anymore.

Re: JRX-2 mid-motor oval racer

Posted: Thu Sep 06, 2012 5:58 pm
by highwayracer
Nice job Daniel.

I used the same setup when there was a carpet oval track in my area. On mine, I had to modify the rear bulkhead to correct the rear toe in and anti-squat. Did you have to do the same?

Regards,
Roger

Re: JRX-2 mid-motor oval racer

Posted: Fri Sep 07, 2012 4:06 pm
by dldiaz
highwayracer wrote:I had to modify the rear bulkhead to correct the rear toe in and anti-squat. Did you have to do the same?
The rear bulkhead was sawed apart - the upper portion remains bolted to the gearbox and the rear shock tower is still bolted to this upper portion of the bulkhead ((the whole assembly now faces rearward)); camber links have been reversed on both the rear bulkhead and the rear axle carriers (compared to stock JRX-2).

The BOTTOM of the rear bulkhead is trimmed down to only the part that supports the hinge pins (i.e. - the battery cup is shaved off), this part remains bolted onto the chassis in the stock location.
So both hinge pin supports are in their original locations; you can still change toe and anti-squat as on any other a-arm JRX-2...

The chassis was also shortened a bit at the very back, where the lower curve of the stock motor plate used to bolt onto the chassis.

a couple more pictures:
Losi JRX-2 rear bulkhead 1.jpg
Losi JRX-2 rear bulkhead 2.jpg

Re: JRX-2 mid-motor oval racer

Posted: Sun Nov 11, 2012 9:49 am
by Dirtcar75
That is awsome! I might have to find a jrx2 and build one! I absoutly love my mid motor 22 and my electric rc10gt! Great project! Looks awsome!