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MLST2 Ezrun 18a and 5200kv

Old 10-30-2010, 09:22 PM
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jrowles91
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Default MLST2 Ezrun 18a and 5200kv

Was curious if anyone could tell me what kind of performance I can expect out of 7.2v with this setup in my Mini LST2. Stock spur and pinion gear. Thanks guys!!
Old 10-30-2010, 11:18 PM
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RobbieP
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Default RE: MLST2 Ezrun 18a and 5200kv

ANYtime you jump up to a hotter motor, you have to change the gearing (smaller pinion).
I doubt that smallish amp-rated ESC could handle the load demands of your mlst.
Old 10-30-2010, 11:29 PM
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jrowles91
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Default RE: MLST2 Ezrun 18a and 5200kv

Wouldn't a single brushless motor be able to handle the same gearing as a far less powerful brushed motor? As far as the speed control, I'm not sure. The one Losi sells for the truck is a 25 amp esc but we'll see. The EZrun 25a esc is only $21 no shipping so if I fry it I'll buy the upgrade. Have you any idea on my question though?
Old 10-30-2010, 11:34 PM
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RobbieP
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Default RE: MLST2 Ezrun 18a and 5200kv


ORIGINAL: jrowles91

Wouldn't a single brushless motor be able to handle the same gearing as a far less powerful brushed motor?

NO
Old 10-30-2010, 11:53 PM
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jrowles91
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Default RE: MLST2 Ezrun 18a and 5200kv

Ok so say I change my order to the 25a esc. THEN what improvements would you think?
Old 10-31-2010, 09:22 AM
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RobbieP
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Default RE: MLST2 Ezrun 18a and 5200kv


ORIGINAL: jrowles91

Ok so say I change my order to the 25a esc. THEN what improvements would you think?
With a vehicle that heavy and with that much drag from the extensive drivetrain, I wouldn't settle for anything less than a 35a ESC (and maybe more) - but I'm not sure what "improvements" you're wanting or expecting.

You still won't be able to run it using the stock gearing, no matter what you do.
Old 11-05-2010, 07:05 PM
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jrowles91
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Default RE: MLST2 Ezrun 18a and 5200kv

Alright, I got the system with the 25a esc. On 6 cell NiMh the thing barely get's luke warm, and used the same battery and gearing (I believe I counted it as 52 spur and 23 pinion) as my dual brushed motors. Results... 20.4 mph which is a 6 mph increase over stock!

RobbieP suggested getting a smaller pinion gear and I know that would help with launch but how would it affect my top speed? I'd like to stay where I'm at but I'm thinking maybe with easier gearing the motor can spin faster thus giving me back my top end.

Comments suggestions PLEASE!!! Thank you guys![img]



Old 11-05-2010, 10:00 PM
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burnineyes
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Default RE: MLST2 Ezrun 18a and 5200kv

The 25A ESC will be plenty, they generally under-rate them so that they will seem more reliable.
As for the gearing, if the motor runs cool and you like where you are with acceleration and top speed then no need to do anything. Generally for each tooth you drop on the pinion you will lose 1-2MPH, but in some cases the added acceleration makes the car feel faster. If you are overloading the motor you can pick up top speed by dropping pinion size, but it will run hot if you overload it. Your choice in gearing is all dependent on how you want the truck to drive, your only limiting factor should be heat.
Old 11-06-2010, 12:36 AM
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jrowles91
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Default RE: MLST2 Ezrun 18a and 5200kv


ORIGINAL: burnineyes

The 25A ESC will be plenty, they generally under-rate them so that they will seem more reliable.
As for the gearing, if the motor runs cool and you like where you are with acceleration and top speed then no need to do anything. Generally for each tooth you drop on the pinion you will lose 1-2MPH, but in some cases the added acceleration makes the car feel faster. If you are overloading the motor you can pick up top speed by dropping pinion size, but it will run hot if you overload it. Your choice in gearing is all dependent on how you want the truck to drive, your only limiting factor should be heat.
Awesome, thank you very much! I only ran the truck for maybe 5 minutes but I was doing nothing but speed runs and hard acceleration, so I figured if it was going to heat up it would have. I just ordered some Zippy 3s 1000mah batteries from hobbyking so we'll see how it screams with some "real" batteries!
Old 11-06-2010, 10:25 PM
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yotaman1991
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Default RE: MLST2 Ezrun 18a and 5200kv

I'm wondering how you up-graded your drive train. i have a mini raminator with lst2 diff gears and stock trans gears with dual stock motors and it breaks trans gear alot. maybe the lst2 has different trans gears then my ram but i don't know.
Old 11-07-2010, 12:31 AM
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jrowles91
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Default RE: MLST2 Ezrun 18a and 5200kv

Excellent question. I used a two part epoxy to glue the center diff and rear diff together so they are locked always. The epoxy is like 3500psi breaking strength, and haven't had a bit of trouble.
Old 11-07-2010, 02:18 AM
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AdamHeard
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Default RE: MLST2 Ezrun 18a and 5200kv

I've run the 18A and some 4600 kv brushless of their site that was a bit longer than that ezrun. No issues so far, works great.
Old 11-07-2010, 11:07 AM
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jrowles91
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Default RE: MLST2 Ezrun 18a and 5200kv

MLST2? That's good to hear. How does the 18a esc hold up? Does it get hot?

Also what gearing are you using?

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