JRX-2 mid-motor oval racer

[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.

[kfeldt]

Cool project!

- Keith

[License2iLL]

Really like this different arrangement. Very nicely done.

Need brighter pics higher resolution. Nice craftsmanship.

[LTO_Dave]

Very nice! This reminds me a lot of the buggies that I used to race with years ago on carpet oval.

[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.

[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

[dldiaz]

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:

[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!