Help Picking a system for my 2WD rustler.

[Ecthelion4473]

I'm in need of some help picking a brushless system for my 2wd rustler. My main concern is heat during summer (115) i want to be able to drive it pack after pack without worrying about temps. It will be run solely on 2s and i want a top speed of 35mph. After a lot of googling I've settled on the HW 3665 max10 systems or the Castle 1412 systems.

My rustler should be just over 6LBS once done depending on the system

My problem with castle is what ESC would be best and what motor KV 3200 or the 2100. the Lower KV 2100 should make less heat right? but it will also require a lot of gearing up to hit 35mph on 2s. And as far as ESCs are concerned copperhead 10? mamba x?

With Hobbywing max10 2400kv or 3300kv same question about gearing. and THB i dislike how Hobbywings "feel"

 

[9x19]

I'd go with the 3200/3300 kv motor, and I have a preference (without strong evidence) for the Hobbywing systems.

 

[Chubaka]

I can't vouch for hobby wing yet as I haven't used mine but they are popular. For castle a sidewinder combo can be had for 125ish.

 

[Slick2500]

I run the stock power system out of the Arrma Granite on the stock Rustler VXL gearing.

https://jennysrc.com/collections/ar...ess-blx100-esc-speed-control-granite-ar102711

https://jennysrc.com/collections/ar...brushless-3200kv-3660-4-pole-granite-ar102711

 

[ZaneC]

I've got this is n my Slash:
https://www.hobbywingdirect.com/col...p-10bl120-sl-system-g2?variant=40838717407347
Should work well for your Rusty.

 

[Ecthelion4473]

I can't vouch for hobby wing yet as I haven't used mine but they are popular. For castle a sidewinder combo can be had for 125ish.

price point really isn't a issue but.... saving money is never bad and i wanna try sensored i have a old castle 3800kv system in my Ofna crt.5 and always liked it. when my VXL system randomly died in my stampede 4x4 i replaced it with a quicrun g2 system and i just don't like the feel as much as the castle but its alot better then the vxl system.

I'd go with the 3200/3300 kv motor, and I have a preference (without strong evidence) for the Hobbywing systems.

normally id go with those as well but everything I've read says lower kv is less heat. but as my goal is 35mph no matter the system and to live through the summer. I'm just unclear if the lower kv systems geared up will be just as hot or just a negligible difference

 

[Ecthelion4473]

I've got this is n my Slash:
https://www.hobbywingdirect.com/col...p-10bl120-sl-system-g2?variant=40838717407347
Should work well for your Rusty.

my rustler is a little overkill and is on the heaver side vs stock id assume during summer id overheat it

 

[Lumikko]

I'm just unclear if the lower kv systems geared up will be just as hot or just a negligible difference

Generally speaking, electric motors are more efficient at higher rpms so a higher kV motor with a light gearing should run cooler compared to lower kV with a taller gearing.

People often say low kV means higher torque but this is not exactly the case. High kV motors with otherwise comparable specs should produce the same amount of torque but they draw more current when doing so.

Comparing side by side, two motors at the same rpm and torque produce the same amount of mechanical power. Since electric power is a product of voltage and current, the higher kV motor, having reached the same rpm at a lower voltage, must logically draw more current unless it’s going to produce power out if thin air. This is why higher kV motors must be geared lower.

Since you have a realistic top speed expectation, and you want to keep temps safely in check, I don’t think it’s going to make a big difference either way. Just avoid very high and low kV ratings and it’ll be fine.

If you look at the final drive ratio recommendations of the motor and use the internal gear ratio, you can calculate an expected top speed and compare it to the FDR recommendations. These are usually conservative enough. Racers go beyond these, but they carefully monitor motor temperatures and only need to make it through 5 minutes before the car is allowed to cool down again.

 

[WickedFog]

my rustler is a little overkill and is on the heaver side vs stock id assume during summer id overheat it

Grab a 3665 can for a bit more umph pushing the extra weight around. The Hobbywing Max10 combo below at 3200kv would be what I went with.
https://www.hobbywingdirect.com/pro...1&_sid=bdda9bb78&_ss=r&variant=40522184228979

 

[Mister 4x4]

My advice: trade up for a Nitro Rustler, if you're wanting to run tank after tank after tank without overheating issues in the summertime.

Initially, I was being sarcastic, but the more I think about it that's one of the biggest positives for nitro over electric - less downtime between runs. Just don't get flipped over or expect to 'back-up' over anything.

 

[Ecthelion4473]

My advice: trade up for a Nitro Rustler, if you're wanting to run tank after tank after tank without overheating issues in the summertime.

Initially, I was being sarcastic, but the more I think about it that's one of the biggest positives for nitro over electric - less downtime between runs. Just don't get flipped over or expect to 'back-up' over anything.

Funny enough i have a nitro Rustler/T-maxx and HPI Firestorm-10t i still have 1.5 gallons of Byrons fuel. I think i've run them about 4 times total in the last 11 years. My crt.5 and stampede 4x4 have done well but i wanted a electric 2wd stadium truck so i built a overpriced rustler

 

[Ecthelion4473]

Grab a 3665 can for a bit more umph pushing the extra weight around. The Hobbywing Max10 combo below at 3200kv would be what I went with.
https://www.hobbywingdirect.com/pro...1&_sid=bdda9bb78&_ss=r&variant=40522184228979

that is indeed the HW combos i was looking at, do you have any experience with it?

 

[Ecthelion4473]

Generally speaking, electric motors are more efficient at higher rpms so a higher kV motor with a light gearing should run cooler compared to lower kV with a taller gearing.

People often say low kV means higher torque but this is not exactly the case. High kV motors with otherwise comparable specs should produce the same amount of torque but they draw more current when doing so.

Comparing side by side, two motors at the same rpm and torque produce the same amount of mechanical power. Since electric power is a product of voltage and current, the higher kV motor, having reached the same rpm at a lower voltage, must logically draw more current unless it’s going to produce power out if thin air. This is why higher kV motors must be geared lower.

Since you have a realistic top speed expectation, and you want to keep temps safely in check, I don’t think it’s going to make a big difference either way. Just avoid very high and low kV ratings and it’ll be fine.

If you look at the final drive ratio recommendations of the motor and use the internal gear ratio, you can calculate an expected top speed and compare it to the FDR recommendations. These are usually conservative enough. Racers go beyond these, but they carefully monitor motor temperatures and only need to make it through 5 minutes before the car is allowed to cool down again.

Thanks for the breakdown sounds like 3xxx systems would be best. You seem very knowledgeable do you have a preference for castle or HW?

 

[WickedFog]

that is indeed the HW combos i was looking at, do you have any experience with it?

Not that particular combo, but HW makes good stuff. And that motor kv is good for any of the Traxxas 2wd stuff. The extra can length of the 3665 will allow the motor to handle heavier rigs (longer magnets). And the Max10 ESC has plenty of power for a Rustler. It's not rocket science. They are tried and true components for that platform and will easily hit your desired mph. From there you'll just need to select the proper gearing.

 

[Lumikko]

You seem very knowledgeable do you have a preference for castle or HW?

Thanks! I’m glad if I can help.

I have no personal experience with Castle but would not hesitate to buy a combo from them.

With HW, the only way to go wrong is to pick the wrong model for your purpose.

 

[Slick2500]

Thanks for the breakdown sounds like 3xxx systems would be best. You seem very knowledgeable do you have a preference for castle or HW?

My views on Castle their Sidewinder escs just don't cut it compared to their Hobbywing counterparts when it comes to powering things like servos and other accessories do to them only having a fixed 2a 5v bec. Hobbywing escs have either a 6v-7.4v bec for the Quicrun and 7.0-8.4v for the Ezrun escs both of which cost less than the Sidewinder 4. You either have to buy a bec or upgrade to the Copperhead, Cobra 10 or the Mamba series to have an adjustable bec.

I think Castle does this intentionally to try and force sales of their becs on people. But that is just my opinion.

 

[Ecthelion4473]

I think I've settled on the max10 3665 3200kv combo thanks for everyone's help

 

[BudUMfan]

I think I've settled on the max10 3665 3200kv combo thanks for everyone's help

Excellent choice sir!

 

[RustyUs]

I think I've settled on the max10 3665 3200kv combo thanks for everyone's help

Great combos. Probably overkill for a 2wd Rustler, but I totally understand your situation. People told me my EZRun 3665 G3 was overkill for my "lightweight" SCT 4x4. Just like you, I wanted to be sure of my motor being able to handle mid-summer heat while doing 15-minute runtimes. The extra length of the 3665 shouldn't pose too much of a protection problem on your Rustler.

 

[jojobeans]

Great combos. Probably overkill for a 2wd Rustler, but I totally understand your situation. People told me my EZRun 3665 G3 was overkill for my "lightweight" SCT 4x4. Just like you, I wanted to be sure of my motor being able to handle mid-summer heat while doing 15-minute runtimes. The extra length of the 3665 should pose too much of a protection problem on your Rustler.

I’m the same way now. Oversized the motor and gear for the speed I want. I like cooler temps, long run times and don’t like fans. Just because you have all that motor, doesn’t mean you gotta use it.