Recommendation?

A buddy of mine is putting in a big track, 12 foot wide oval with a 40 by 110 foot infield. I'd like to get my twin force competitive with his TMaxx. I'm thinking the Feigao 8L and a warrior 9918 or MGM Compro 120 amp should do the trick. I'd like to stay with 12 cells, but may occasionally run 14 cells. I'm looking for opinions on this set-up, or a better one.

What Lehner motor would be the equivalent of the 8L? I'm looking for speed, but I'm not interested in busting my drivetrain everytime I squeeze the trigger.
Thanks for any suggestions,
Brian

Oh yeah, I'm new here, I'm liking the board so far.:cool:

[RC-Monster Mike]

Welcome aboard, Brian. The warrior is probably the controller you want, as the MGM only goes to 12 cells. The 8L or 9L would get your twin moving in a hurry (either could handily beat up on a t-maxx). The Lehner motors of choice would be the xl2400, xl2800 or xl3100. The xl3100 would be the fastest of all the motors mentioned, while the xl2400 would get the best runtime (would also be the slowest, but on 14 cells could likely beat a t-maxx). Probably the xl3100 would be the one for you, since you are looking for some serious speed. Any brushless motor on 12-14 cells will have enough torque to challenge your drivetrain!

[luihed]

BDK, welcome to the forum.... Im new here as well and Mike is the man to ask about brushless....... My buddy has a twin force too and wants to go brushless but is not sure how his drivetrain will cope with all teh power...... Please let me know how it works for you when youre done so I can pass it on to my buddy....

[supermaxx4190]

Originally posted by RC-Monster Mike
Any brushless motor on 12-14 cells will have enough torque to challenge your drivetrain!

AMEN! The 9L sounds like the motor for you. Can you put maxx sized rims and tires on a twin force?

[Dafni]

Originally posted by supermaxx4190
AMEN! The 9L sounds like the motor for you. Can you put maxx sized rims and tires on a twin force?

You can. The TF comes with 14mm alu hex hubs covered with 19mm plastic adapters. It works well, but on a Force you want some bigger tires. I have the old MadForce wheels (USA-1) with some MegaForce rims (more offset) on mine, and I even switch to LST wheels sometimes.

I'm also running the 9918/9L combo in my Twin. It's hella fast on 14 cells. I smoked a Savage the other day:p

Mike,

Do you use the 9918 w/ 12 or 14 cell applications? I've considered this speed control but have heard mixed results with regards to cogging. The next logical step in speed control options (whether its BK or Schulze) is twice the price (which begs the question, why isn't there much in between?).


My son and I both use (ATM) 14 cell gp3300 matched 1.17's...I'm thinking of either 9918 & MAXXimum or 9918 & 3100xl. Both trucks are a few ounces under stock weight, will either setup provide enough runtime and speed for a 10 minute heat?

Also, do I need the UBEC w/ the 9918?

thx!

[Serum]

Well, i had a schulze 18.97 with a bigmaxximum. The 9918 for sure is smoother than the schulze.. Not just smoother, but>Much smoother.... The 9918 is an underrated controller. A user on this forum has got his 7XL powered with 18 cells and this 9918. I know about a person in Germany that uses the 2240/8 (highamp model) with a 9918 on 16 cells. (and he claims it runs faster than a bigmaxximum powered on 18 cells)

The thing with the schulze i used (both of them) hit thermal shutdowns constantly, no matter what gearing, even with a fan. The schulze has got a 2-3 seconds delay before it hits reverse.

I hated those thermal shutdowns. Very annoying. I liked my savage doing speedruns, but when the 18.97 hit his thermal shutdown during one, it flips right over, because the controller hits FULL brakes when it does thermal out.. (a lack of engineering, because the transistor already are overheated and need to transfer the energy back from the motor to the controller again) Not to mention the punishment the whole drivetrain had to go thru.. (it did cost me two ringgears on the frontdiff and two pinions for that diff)

You are comparing two different motors, the low budget version of lehner with a high-end aimed plettenberg.

Though, the XL3100 is a serious motor, you might as well look at the 1930/1940 motor of Lehner.

I am a personal fan of BK instead of schulze. Look op the thread about the plettenberg motor, and you'll see what i mean.

The maxximum is not working properly with the 9918. The MGM controllers do work fine on this motor though.

It is a nice motor, but lehner is simple more bang for the buck.. (for sure!)

with 14 cells, your better of using an Ubec.

Hi Serum,

Thanks for the response. I've heard many a negative comment about Schulze, especially regarding their service.

Originally posted by Serum

. . .

You are comparing two different motors, the low budget version of lehner with a high-end aimed plettenberg.

Though, the XL3100 is a serious motor, you might as well look at the 1930/1940 motor of Lehner.

The 1930 series looks very efficient compared w/ the 3100XL. It's a few grams heavier but not so hard on the controller or the batteries (and consequently the runtime), the voltage constant is close too;

Basic XL 3100 1300 Watts 80 Amps 3100 215g
1930/6 1200 Watts @ 30 Amps 3483 230g

I assume by the weight that perhaps the 1930 series has a little more torque? Wish Lehner would post similar motor specs that others do (Rm and Lo).

BTW, where would I get a 1930?

Originally posted by Serum
[B]
I am a personal fan of BK instead of schulze. Look op the thread about the plettenberg motor, and you'll see what i mean.

The maxximum is not working properly with the 9918. The MGM controllers do work fine on this motor though.[b]

That's my understanding as well. Seems the 9918 isn't so compatible w/ the 4 pole design of the MAXXimum...anybody using the 18120 w/ the MAXXimum? Is this a BK design issue w/ 4 pole motors or can the "issue" be compensated w/ more voltage?

Originally posted by Serum

It is a nice motor, but lehner is simple more bang for the buck.. (for sure!)

with 14 cells, your better of using an Ubec.

So maybe the 9918, 1930/?, and 14 gp300 matched (1.17) will provide excellent top speed and good runtime.

[Serum]

I would start trying the 9L and if you don't think that motor gives you what you are looking for; sell it on ebay for 10-20 less than you bought it for and buy the 1930..

The 1930 can draw serious amps as well!!
It depends on the windings (k/v range)

Look here

Mike can get that motors from BK. just email him.

I also know a guy who had the 30150 and the bigmaxx. Doesn't work either.

[RC-Monster Mike]

I use the warrior controllers on a few vehicles. The BEC is rated for 12 cells(and ideally if you run more a UBEC should be considered), but I have run my warriors on up to 5s LiPo power (over 24 volts when peaked) with the controllers BEC and I haven't had any trouble. The micro controllers and warrior controller act the same when driving them, but the micro controllers have many more adjustable features via the programming cable, so you can tune it different ways. The Feigao motors have got to be the hands down price vs. performance kings of brushless. The Lehner basic and basicxl motors are a step up, and the "real" Lehner (19xx etc.) and Pletts are top of the line. The difference between the top of the line and the low cost motors (Feigao) is small, and most likely will not be noticed by the average user. The higher end motors may run a touch cooler due to slightly better efficiency, but as I said, most won't know the difference. If you are trying to set a speed record or for some other reason need to have every ounce of available power and efficiency without regard to cost, the top of the line Lehner motors are second to none. As far as the BK controllers and the Plett motors, I can't say how or if they work, as I have never tried them together.

[supermaxx4190]

the L motors are awesome. i have just started running mine and it is crazy. i run the 10L on 16 cells with the 9918. I race every week at my local track against savys and tmaxxs. I havent got a full run in yet with the new setup (used to run an 8L on 12 cells). My truck and drivetrain are bulletproof, but i dont have any wheels that will hold up to the power. in 3 runs i have rounded out the hexes in 3 revo rims, 2 hpi rims, and ripped the middle out of a 40 series velo. i bought some 23mm dish wheels, but im waiting for dace to finish making adaptors for UE driveshafts. power difference between 12/16 cells is incredible, make sure your truck can handle the power before dropping in BL. good luck

Great info so far. I think I'll look at the 9918 and 8L with 12 cells for now. I had a job interview today, so I don't know how soon I'll get around to putting something together. I'll pst my results as soon as it happens, though.
-Brian

[lipomax]

You know, the Basic series motors are really wound the same way as the "Real Lehner" series. Just not segmented so possibly less efficient at partial throttle. The Basic XL is more powerful than the 1920 series but slightly less so than the 1930 series. The XL series is actually a "1925" with a cheaper rotor and not changeable from delta and wye configuration.