1940/6 + MM Questions - Page 2 - RC-Monster Forums

BP-Revo · 02.19.2007, 04:26 PM

Whats the difference between Wye and Delta configuration too?

BrianG · 02.19.2007, 05:28 PM

It's not hard to dremel a flat spot on the shaft. Just make sure the bearing and screw holes are covered so metal dust doesn't get in there. I just held my Neu shft with two fingers and used a small sanding drum on the dremel. Took about 1 minute.

IIRC, If you re-wire the LMTs from D to Y, you reduce the kv by a factor of 1.73 (I think). This allows you to run higher voltage in Y, and lower voltage in D and keep the same rpm.

BP-Revo · 02.19.2007, 07:14 PM

Oh...ok.

Well, do you guys think I should stick with a 1940/6 or try a 1950/5 Hi-Amp? They have very similar KV (difference of like 1), but the latter obviously has tons more torque (and current draw).

Do you think it would be too much? I just figure if I'm going to spend this much money, I want to make sure its what I really want so I wont feel like "I should have gotten a more powerful one." But on the other hand I don't want my truck way over powered.

Sylvester · 02.19.2007, 07:21 PM

This is just what i have experienced with 4s2p 8K lipos, 1950/7T geared 16/44 in my truggy.. It is TOO much speed. I mean, this thing has amazing acceleration, the top speed hasent even been completely reached yet, but at around 2/3 throttle you dont even want to go faster, i cant imagine a lower Turn motor. If you were to go with a 1950, imo a 6T is the lowest i would go.

BP-Revo · 08:52 PM

What speeds are we looking at here? 50mph? 60mph?

A vid would be great if you have one.

I guess I'll either go 1950/6 or 1940/7 then. That way I will get the Hi-Amp version of which ever I choose...the delta and Y stuff is too confusing for me...3 wires are pushing it;)

Sylvester · 02.19.2007, 08:51 PM

If i had a cam i would get a vid of it, im looking at getting one very soon.

I cant really say its top speed, but at not much more past half throttle it is well over 35, i might just get a GPS on it, need one of those too, lol.

BP-Revo · 09:17 PM

Wow...that would put top speed over 50mph at the very least. Thats very fast. I have the same batteries (2x 2S 8K lipos = 4S), so if I run a 1950/6 it should be even faster...which would just be insane...

I think you just made my choice Sylvester.

Does anyone know how well a G2R drive train holds up to this kind of power?

Also...are 1950's pressed endbells or what? Please don't say they are pressed...

Sylvester · 02.19.2007, 09:18 PM

If your running a single speed, center dogbones, normal revo shafts, i think it should be fine. I hope your running a metal idler in your tranny :)

BP-Revo · 02.19.2007, 09:24 PM

Quote:

Originally Posted by Sylvester

If your running a single speed, center dogbones, normal revo shafts, i think it should be fine. I hope your running a metal idler in your tranny :)

Current drivetrain is:

Stock Revo Diffs
Stock Sliders on 4 Corners
G2R "Stock" Dogbones in the middle
G1 Single Speed with UE Idler - but I think I'll be taking my lightweight output shaft out and opting for the steel one again... :eek:

Now...the big question would be 32P or Mod1 Gears?

Sylvester · 02.19.2007, 09:30 PM

Mod 1 gears for sure.. a strobe with the ofna 51T gear would be ideal..

Your drivetrain will be tough as nails once the 1/8 diff conversion comes out for the revo.. the stockers should last for a bit if not abused too hard, but once mike releases those diffs, you will be golden:)

BP-Revo · 09:43 PM

But that would suggest sinking more money in...hopefully the stock one work. If not, I can throw in some robinson gears and maybe an aluminum diff cup and even diff case and hopefully that will work.

After I put in the 1950 and whatever ESC I use, I was hoping to be able to just run this thing without spending any money (other than a repair here and there).

Sylvester, do you know the overall gear ratio of your truck (the one with the 1950)?

crazyjr · 02.19.2007, 09:45 PM

The stocker or robinson slipper will never hold, I ripped up a pair of robinson pads before i went strobe, that was with a 9XL

BP-Revo · 02.19.2007, 09:58 PM

I was referring to diffs.

For a slipper, I think I'll be getting ProCharged5.0's HSR slipper setup. That way, I can use Revo spurs too. Because I think I'm going to need a 40T spur with a 20T pinion to get the gearing I'm gonna need...

crazyjr · 02.19.2007, 10:20 PM

I don't think you can get down to the 40 but Procharged is doing a spur gear custom.

I'm running 4+year old Emaxx diffs on a 7XL and up to 5s without problems (stock plastic-cupped) so you should be ok with the upgrades

BP-Revo · 10:40 PM

Procharged's HSR uses a Revo slipper...which means I can just use Nitro Revo spurs, which are available in 36, 38, and 40T. I'm going to need these because according to Brian's calculator I need to gear like 16/40 to get just 40mph...

Edit...nevermind: BrianG's calculator can only be so accurate. Lehner's KV values must be underload values, and his estimator must be set to accomodate for unloaded values. Because I just put in the specs for Sylvester's LSP and it gave me like 44mph...and from what I understand its a hell of a lot faster...