Lehner 1950 or 2230 with 5\6s and an MGM Compro 16024? - RC-Monster Forums

Purplefade

Hey gang, been hanging out for a while brushing up on my brushless, lol..

I'm currently running a 13 pound brushless savage using a Nemesis 8XL behind a BK Warrior 9920 with 4s (14.8V) and 16\47 gearing.

Pretty fast (and gets there quick too) but it seems to top out and drop off before my nitro trucks do, I'm looking for something to keep it pulling hard, without all the heat my current setup puts out. My plans were a 1950\7t behind an MGM Compro 16024 running 5 or 6s. I've since been thinking about using the 2230\10t still using the MGM 16024 and 5 or 6s? Gearing with the lehner is still up in the air for me.., I know the current 16\47 won't cut it, suggestions? And if not the MGM, I almost just ordered it today, but decided to seek some guidance from the gurus before I jumped into something . I know you hear it all the time, but I'm looking for a decent blend of power and speed, leaning towards speed :027:

aqwut · 11.07.2006, 08:07 AM

hey, if you plan on gettin' the 24.160... why not run it with 8S Lipos instead of 5-6..?

Purplefade · 11.07.2006, 02:23 PM

Considered going higher on the "s" load, but looking at the motors and the rpms, etc, etc, 6s seemed to be a good middle ground not pushing the motor over its rpm range. Not to mention from what I've heard much over 6s is next to impossible to drive, though that may be a ton of fun:027: :027: :027: The other thing that I had considered is by not running it to its ragged edge, I'd be giving the controller and motor some head room too. 6s would\shoould, keep the controller "cool" as well as push the motor up to the 40K rpm range, I thought pretty good??

aqwut · 11.07.2006, 03:15 PM

but if you get that esc 24.160... you can get a lower kv rating motor...and it will be more efficient also... and you can still run it at 35 to 40K rpms.. whatever you like.... you can get a motor that has a 1300 kv... it will be very efficient also...

Purplefade · 11.07.2006, 10:27 PM

Quote:

Originally Posted by aqwut

but if you get that esc 24.160... you can get a lower kv rating motor...and it will be more efficient also... and you can still run it at 35 to 40K rpms.. whatever you like.... you can get a motor that has a 1300 kv... it will be very efficient also...

Great thought actually, lower kv, longer run times, higher voltage, greater efficiency. With the lehner motors, I know numerically speaking the 2230 is a "bigger" motor than the 1950, but in the end is it really that simple? How will a 1950 compare to a 2230 with the same gearing using 6s? I guess if I can save a few bucks using the 1950 over the 2230 I could potentially bump up to higher voltage.

In the end, I'm looking for something that's going to pull hard, run reliably and potentially top 40mph, if I can have all three:032: From my current experience, again using a Nemesis 8xl and my BK 9920, it runs good, seems to top out a bit early (not quit fast enough) and gets nice and hot after a set of packs, using only 4s...

I considered the Quark 125, but for $280, what's a few more bucks to get the MGM, not to mention the MGM will do my 6s (or higher) with ease, verses the Quarks 5s...

OK, last question for this particular post, if I end up with the MGM 16024 and a 1950, what gearing would you suggest?

Thanks again and appreciate all your input!! I can't wait to get this blasted truck back up and running. I've got my 9L together, also running the Nemesis motor and 9920, but it doesn't even begin to compare to my XL a nd I can only imagine the Lehner behind that MGM :004: :004:

aqwut · 11.07.2006, 11:39 PM

use brianG's calculator.. I find it very helpful.... I don't think it would matter a 1950 or a 2230.... the 1950 would be more convenient..... both them motors have tremendous amount of power.... just don't be stupid like me and do a 2280, you should be fine... I like the MGM 24.160.. but most the guys say that the quark Monster Pro is smoother... probably is true..

coolhandcountry · 11.08.2006, 09:40 AM

Purple fade. Have you tried to gear up a little? The motor undergeared will
run hot as well. You may want to try that.

Purplefade · 11.08.2006, 10:34 AM

Quote:

Originally Posted by aqwut

use brianG's calculator.. I find it very helpful.... I don't think it would matter a 1950 or a 2230.... the 1950 would be more convenient..... both them motors have tremendous amount of power.... just don't be stupid like me and do a 2280, you should be fine... I like the MGM 24.160.. but most the guys say that the quark Monster Pro is smoother... probably is true..

aqwut, good advice on the calculator, I actually have it downloaded and have played with it for my current 9L\9920 combo, don't know why I hadn't yet thought of it for the new project :-) I think we all agree that the Quark is a GREAT controller, but with the 5s\6s issues that it has, and me really wanting to go with 6s, I think I'll stay in line for the MGMs as soon as Mike gets them back in stock. Gives me that 6s I want and some headroom to grow if I need to :027: - And yes, I'll stay away from the 2280, lol, I wouldn't want to have to mount it, or feed it, I'm sure with its size and power handling that it's one hungry giant!!

The bad news, Mikes out of stock on the MGMs for probably a couple of weeks and maybe 3 weeks on the Lehners:002: :002:

Purplefade · 11.08.2006, 10:45 AM

Quote:

Originally Posted by coolhandcountry

Purple fade. Have you tried to gear up a little? The motor undergeared will
run hot as well. You may want to try that.

CHC, quick question, when you say gear up, you mean go down in tooth count? I'm curently running the 8XL on the mentioned 16\47 and it's quick, but not nearly as quick as I think it should be, based on some of the stats I see in these forums, if I rear gear, less teeth, I get less top end and I certainly don't want that. When I purchased the motor an 18 tooth pinion was suggested with the 47 tooth spur. Trying the 18 tooth first the can got blistering hot in virtually no time, backing down to the 16 helped A LOT, but also cut my top end off... Coming from nitro Savages, I wanted to build something that would hold its own, if not run passed, my still nitro burning budies :-) :-)

I've tried the 9920 out of my 9L truck just to be sure it wasn't the controller, still had the same issues, gets warm real fast and just isn't what it should be on the power curve. Don't get me wrong, it will back flip in its own footprint and moves out with some balls, but is still missing something on the top end.

I may snag the MGM, stick it on my current 8XL, play with gearing from there and see what happens. Worst case, I'm pretty commited to snagging a Lehner 1950 and just upgrading everything!!

I'd also be open to any gearing suggestions, what are you guys running on your 8XLs vs the weight of your trucks and 4s?? I didn't think 13 pounds was to bad for a fully converted Savage?? And I'm sure if if I look hard enough I may actully be able to lose another pound or so, but it would mean getting creative, lol...

Thanks guys!! Appreciate ALL the input on this!!

coolhandcountry · 07:58 PM

Yeah go up on pinion down on spur. Numerically lower.
What voltage are you running? I
have found some like more volts. It seems to want less amps to do the same
job. The 1950 I have found runs cooler than the xl motors. I think it has to do
with a better winding job.

neweuser · 11.08.2006, 06:35 PM

Quote:

Originally Posted by coolhandcountry

I was referring to up the size of the pinion.

Meaning more teeth:010:

Purplefade · 11.08.2006, 08:42 PM

OK, here's the new news... Got a deal that I couldn't pass up on a Quark Monster Pro 125B, new in package with the neon wires versus the "old" white wires:027: . I snagged it for $260, shipped, so OK, not a GREAT deal or anything, but still something I couldn't pass up when the 16024 goes for well over 3 bills... I'm going to take the Quark, stick it on my current 8XL, bump up to 5s (18.5V) from my current 4s (14.8V) and see how she goes.

I'm planning on adding a sync to the Quark and a couple of fans to keep temps in check, I'm also planning a sync for the motor and maybe a single 25mm fan for it as well. Best case this will help my current setup and save me $335 for the Lehner, worst case, I planned on spending the cash and I'll grab the Lehner anyway:) :).

Should have the new controller by as late as Monday, once I get things set back up I'll post some pics so you guys can see what I've got going here. Nothing to special, stock Savage 2 speed trans, center CVDs, lowered the stock motor plate by about 4mm and am using ring mounts for the motor. Everything fits great, looks pretty good, but I may make some changes with the new setup, we see...

Appreciate everyones input, now all I'll have to do is fine tune gearing once I have her moving :) :)

jhautz · 11.09.2006, 02:19 AM

I agree w/ CHC. You need to gear up a bit. If your motor is hot and you esc isn't you arent loading the motor enough and its not running as efficient as it could. Find the ''sweet spot'' and it'll run cooler. (and it will get you that extra speed you are looking for)

Purplefade · 11.09.2006, 02:30 AM

VERY COOL!! Looks like I'll be adding that extra "s" and potentially going back to maybe as high as an 18 tooth pinion :) :) Guess I'll find out, lol, worst case, using the 5s should bump up the effiency just a bit and, maybe, make me good to go with the current 16t. Yep, definitly looks like I have some testing to get done!! Can't wait to get the controller, also going to get one of jhautz s quark syncs from Mike and have my self all hooked up!!

Finnster · 11.09.2006, 11:11 AM

Sounds like the upgrades should be really fun and will smoke your nitro buddies :)

One thing tho I wouldn't do is put a heatsink and fan if you get the 1950. If you've ever played with mounting heatsinks on a CPU, you will find that the HSFs need a ton of spring force onto the CPU to work properly. Its about 25 lbs for a 0.5" sq cpu.

Even then, if you don't do a good job with the thermal compound that goes between the HSF and CPU, you will still get poor heat conductance, and potentially create an insulator trapping heat. I can't see any reasonable way you could make an easy motor HS that would be better than just leaving it be. Also, a 25mm fan will not move much air and would be lost in such a big motor.

The HS for the Q125 is a bit diff as you are adding onto the existing undersized HS (vs say direct mount onto the FETs) and the heat output per area of the case isn't as great as a CPU, so the tolerances are more forgiving.

any reason you didn't want to put 6s on the 9920?