Jammin CRT .5 Project

[riceman]

Some Speed Runs!


Gearing is 13t/46t. Still have the 4600 in it but went up to a 3S 6000mah Lipo pack. Diffs are now filled using Jammin Jay's setup. It still doesn't look very fast in the video. In person though it is plenty fast.

[riceman]

Well - I think I just jinxed myself in the other .5 thread. I said how cool everything was running and I would try gearing up. I did and I think I overdid it. I went up a tooth on the pinion to 13t (with the 46t kyosho spur) and put a 3S cell in which is the configuration that I ran the speed runs with. No problems with heat on the short speed bursts. However, this is not a good combination at the track. ESC did shut down on me after about 5 minutes of run time and motor was close to 200 :026:. I would like to keep the 3S and perhaps drop the gearing back down. I didn't have any other pinions with me at the time so I'll have to try again another day.

[suicideneil]

In all honesty man, after watching the vid I think its safe to say if it went any faster it would take off. That is a missile of a buggy- accellerates like I dont know what & the steering is impressively sharp. I would say 12/46 or 13/48 is as tall as you could get away with without destroying something expensive.

[riceman]

Originally Posted by suicideneil

In all honesty man, after watching the vid I think its safe to say if it went any faster it would take off. That is a missile of a buggy- accellerates like I dont know what & the steering is impressively sharp. I would say 12/46 or 13/48 is as tall as you could get away with without destroying something expensive.

I dropped down to 11t/46t combined with 3S lipo and I think this is the ticket for my track.:027: I went through almost two full packs before a run in with an 1/8th scale buggy and the end of a long straight did me in. Rear upright and rod end broke off sending the wheel and CVA flying off. I wish I had someone to video as it was finally performing as I had hoped it would. Temps were acceptable with the motor in the 150-160 range and the ESC at about 110. Battery was under 100. I'll definitely try to get some video the next time out.

[jnev]

That sounds great. You should really watch out for those 1/8 buggies. They can be dangerous.:005:

[phidailo]

I didn't realize till after I glued the tires to the wheels but do you guys think that the wheels that use the pins will withstand the brushless power? I kinda wish I had used the ones with hexes.

[skellyo]

They should be fine. Associated B4's and T4's along with Losi XXX's only use pins and they have no problem with BL power.

[BrianG]

Would re-inforcing the area around the pins with plastic epoxy help make them a little stronger?

[riceman]

It's been nice reading everyone else's input to their .5 builds. The motor and gearing issues of particular issues. I've been running 12t/46t with the 4600 on 3S and it does tend to get on the warm side in the 160-170 range after 15 min or so on the track. Then again my shell is closed with no air flowing through so that could be a big contributor to that. We'll see as I will head to the track today with the new 2.2 Snake Eyes truck tires installed. I've also put a heat sink on the motor. The RPM receiver box is a new addition that now safely houses my rx and UBEC.

New Shoes: Proline mounted on Associated GT2 wheels.










With the added rotating mass of the truck tires I can now do this!

I'm off to the track this afternoon to see how the new tires work there. Report to follow.:027:

[suicideneil]

Double back flips! Im impressed....

[jnev]

Those double back flips were very impressive.

Do you have a mount for the RPM battery box? What is it made out of?

[riceman]

The RPM box and ESC are servo taped to an aluminum top plate that replaced the stock top plate. Nothing fancy going on there.

Well, here is the report on the 2.2 Proline Snake Eyes. Go out and get them. If your track is at all like mine with big ruts and lots of bumps and imperfections then the truck tires are the way to go. It was soaking up stuff that flipped it over before with the buggy sized tires. And I really don't think I lost much at all in terms of handling. What was lost there was more than made up by greater stability on the bumpy straights. Here's the skinny:

Pro-Line Snake Eyes 2.2 M3
Associated GT2 Rear Wheels #7847
Traxxas Axle Pins #2754

The stock axle pins were a couple mm too long to fit the AE wheels. I used the AE wheels because I found the ribbing in the Pro-Line wheels that I tried rubbed the uprights.


Here's the video.

[jnev]

Cool video. Glad the tires worked out for you.

[suicideneil]

It certainly handles nice and sharp, and looks great while its doing it.