Another Brushless REVO conversion - RC-Monster Forums

BrianG · 12.23.2006, 08:35 PM

Quote:

Originally Posted by Shark413

Regarding the gearing, I have a problem. Using the special motor mount I can only use the 40T spur and 15T pinion. I cannot move the mount any further to the right to adjust for smaller Spurs or pinions. This is because I am using the Revo Mod 1 gears. The mount was originally designed to use the stock 48pitch gears off an E-Maxx. I like the Mod 1's because they are stronger. I guess I could drill and re-tap some new holes to allow me more adjustment, but there isn't much selection in Mod 1 pinions with a 3mm bore hole and the largest spur traxxas makes for the Revo is a 40. I could probably mod a truggy spur to fit, but that would be more work. And on the track I race on, 36 mph top speed and super strong accelleration works out perfectly.

Maybe "machine" out the mesh slots on the mount for more range??

BTW: The person who made your mount actually uses 32p gears IIRC. Maybe see if the Jato 54T spur fits there? It might not since it is kinda large in diameter compared to the Mod1 40T, but might fit since you have the spur spacer...

Shark413 · 12.24.2006, 03:35 AM

BrianG, as you may already know the 40T mod 1 spur comes very close to the chassis. There really isn't much room for a larger Mod 1 spur gear. With a 48P spur you can probably squeeze in a slightly bigger (numerically more teeth) gear because they are physicaly smaller. I may go that route eventually, if track testing shows I need the gear (lower) change. The slots on the mount are pretty much as close to the edges as you could make them. As I said you would have to drill and tap new screw holes to be able to use smaller Mod 1 pinion/spur gears. The accelleration is fine, I was just a little worried about the top speed, which would require a smaller spur/pinion. I need to radar my nitro Revo to see how they compare, I don't trust the Traxxas advertisments (40+ mph). Also, I don't think the gear box was shifting into 2nd gear. So I need to adjust the transmission shift point to make it shift sooner, to see if this makes a differnce. Overall I am very happy with the conversion, because with one as complicated as this it normally takes several prototypes to get it perfect. And there is a lot of fine tuning that still needs to be done (gearing, close ratio gears, shifting adjustment, more powerful batteries, different tires, battery placement, CG adjustments, etc.). This will require track time and that will have to wait until the new year..

Regards

BrianG · 12.24.2006, 02:32 PM

Yeah, I knew the spur gets pretty close, but wasn't sure if that spur spacer piece you got as part of the conversion kit added enough space to allow a little more clearance for larger spurs.

Since you're still using the two-speed tranny, you could gear up by simply getting a larger pinion. The thing is, to get the pinion to physically reach the spur with that mount, the pinion will probably need to be big.

Don't forget, there are three 2nd gear options, close, normal, and wide ratios, which you can use to get the gearing you want.

Shark413 · 12.24.2006, 06:36 PM

BrianG, yeah I have the close ratio gear set. So I have several setups to test out. Std gearing and close ratrio internally, I have a 36, 38 and 40T mod 1 spurs, I have a 13 and 15T mod 1 pinions and I could use the adpater and use 48P Spurs and pinions. But I really like the mod 1 gears. I also want to get the wide ratio gear set as well. How is your brushless Revo working out? Have you tried Lipo's yet?

BrianG · 12.24.2006, 07:02 PM

No, no Lipos, still 14 GP3300 cells. I love my Revo. I locked it into second gear though so I could use reverse and motor brake. I'm also using the wide ratio gear set. BTW: first gear in each set is the same, it's only 2nd gear that changes. I don't know how fast it is, but is plenty fast for the small LHS track...

GriffinRU · 12.25.2006, 06:32 PM

After playing for some time with REVO adapters found out that rear motor support is the most important thing.

I like this setup, as being close to ideal

Artur

BrianG · 12.25.2006, 08:02 PM

Quote:

Originally Posted by GriffinRU

After playing for some time with REVO adapters found out that rear motor support is the most important thing.

I like this setup, as being close to ideal

Artur

Personally, I like the first one better. It uses 6 screws to hold the mount down. The second one relies on only 4 screws into the relatively weak stock motor mount. I do like the rear support though, but it seems it only works for a certain motor length.

(@GriffinRU: The first setup is what I PM'd you about)

To support the rear of the motor in my current design, I just wedged a thick piece of rubbin between the underside of the motor and the mount. Not the prettiest, but it worked. :)