AE Pro4 power upgrade gearing question.

[biggman100]

I have an AE Pro4 brushed version, that I'm putting a HW WP 10BL120 ESC and HW 3660 3700KV combo in, but, I overlooked one thing. The stock AE shaft size is 3MM, and the HW shaft size is 5MM, so, I know I'll need a new pinion, but, I'm not sure if a13T would be too much for it. The stock pinion for both the brushed motor, and the Reedy 3300KV, according to the manuals for both trucks, is a 15T 32P, but, would a 13T 32P on the new motor be too much? 13T is the smallest size I can find in the sets with the right shaft size, and, I don't want to buy individual pinions unless I absolutely have to.

 

[DavidB1126]

13t should be fine. Or 14. Probably could use the stock 15t (but with a 5mm bore) honestly. Just keep an eye on motor temps. If it looks good you can gear up, if it's overheating you need to gear down, or maybe add a fan/heatsink on the motor.

On my 2wd slash running a 3660 ezrun 4k-kv motor on 23/86 gearing it stays cool for days. Rarely does it overheat.

And this is only going to be used on 2s right? If so, you'll be fine.

Imo it's better to have plenty of gears on hand instead of just buying one each time. Well that's me as a racer at track days. Got a snack ziplock baggy full of pinions and spurs. Looking to grow my collection in the future.

 

[WickedFog]

Umm... smaller pinion is actually easier on your electronics bud. A 13t will be fine. For that matter, if a 15t is ok, I am betting a 17t would still be ok. But you need to test for heat to know for sure what works and what doesn't.

 

[nino]

Why would it be too much?

3300KV*15 = 49500 teeth per minute per volt

3700KV*13 = 48100 tpmpv

So one metric smidge slower theoretical top speed than the stock brushless setup. You'll be fine! Like other said, a 14 or 15 or even bigger would probably work too. Tiny pinions are noisier and somewhat less efficient too.

 

[biggman100]

Umm... smaller pinion is actually easier on your electronics bud. A 13t will be fine. For that matter, if a 15t is ok, I am betting a 17t would still be ok. But you need to test for heat to know for sure what works and what doesn't.

After burning up two very expensive $100+ race motors about 15 years ago, I learned the hard way to always check temps. Anymore, I keep a mini temp reader at home, and one in each of the vehicles.

Why would it be too much?

3300KV*15 = 49500 teeth per minute per volt

3700KV*13 = 48100 tpmpv

So one metric smidge slower theoretical top speed than the stock brushless setup. You'll be fine! Like other said, a 14 or 15 or even bigger would probably work too. Tiny pinions are noisier and somewhat less efficient too.

I'm not as concerned about top speed. I just want the truck to be able to get through mildly high grass, and a bit of snow, without bogging, like it does now with the stock brushed setup.

 

[RustyUs]

Your driving style and environment will ultimately determine your success. Checking temps every so often will be your best bet. I will sometimes buy the cheapest multi pack of pinion gears just for situations like you are in. Once I find the sweet spot gearing, I'll put a well-known durable pinion gear in a shopping cart.
Mod .8 32P Steel Pinion Gear Set 13T 14T 15T 16T 17T For 32 Pitch Spur Gear 5mm

 

[biggman100]

Your driving style and environment will ultimately determine your success. Checking temps every so often will be your best bet. I will sometimes buy the cheapest multi pack of pinion gears just for situations like you are in. Once I find the sweet spot gearing, I'll put a well-known durable pinion gear in a shopping cart.
Mod .8 32P Steel Pinion Gear Set 13T 14T 15T 16T 17T For 32 Pitch Spur Gear 5mm
View attachment 204634

That was the set I was looking at. I typically buy them in sets, but, usually, all my trucks have the same gear pitch. This time though, this is the only truck I have that is 32P, so most of them are just gonna sit in the parts drawer.

 

[RustyUs]

That was the set I was looking at. I typically buy them in sets, but, usually, all my trucks have the same gear pitch. This time though, this is the only truck I have that is 32P, so most of them are just gonna sit in the parts drawer.

After burning up two very expensive $100+ race motors about 15 years ago, I learned the hard way to always check temps. Anymore, I keep a mini temp reader at home, and one in each of the vehicles.



I'm not as concerned about top speed. I just want the truck to be able to get through mildly high grass, and a bit of snow, without bogging, like it does now with the stock brushed setup.

Grass is an RC's worst enemy IMO. So many variables when including that type of surface into one's gameplan. Even larger more powerful RCs with wider tires, to help the platform kind of float on top of grass, get bogged down. Again, "grass" has so many variables making it even more important to have an infrared thermometer in your arsenal to help manage your RC's gearing.

 

[nino]

I'm not as concerned about top speed. I just want the truck to be able to get through mildly high grass, and a bit of snow, without bogging, like it does now with the stock brushed setup.

Just saying, if the resulting speed is the same, the load will be similar. A brushless setup is not likely to bog down but will overheat if overloaded.

 

[RustyUs]

Why would it be too much?

3300KV*15 = 49500 teeth per minute per volt

3700KV*13 = 48100 tpmpv

So one metric smidge slower theoretical top speed than the stock brushless setup. You'll be fine! Like other said, a 14 or 15 or even bigger would probably work too. Tiny pinions are noisier and somewhat less efficient too.

... longer can, and more magnet surface area to think about also. Not directed towards @nino, but just in general. When I think about 4wd SCT platforms... 550/3660 size motors 5mm shafts would be a must for me .

I have an AE Pro4 brushed version, that I'm putting a HW WP 10BL120 ESC and HW 3660 3700KV combo in, but, I overlooked one thing. The stock AE shaft size is 3MM, and the HW shaft size is 5MM, so, I know I'll need a new pinion, but, I'm not sure if a13T would be too much for it. The stock pinion for both the brushed motor, and the Reedy 3300KV, according to the manuals for both trucks, is a 15T 32P, but, would a 13T 32P on the new motor be too much? 13T is the smallest size I can find in the sets with the right shaft size, and, I don't want to buy individual pinions unless I absolutely have to.

I like your combo choice. I think that is a perfect sensorless setup for tighter tracks/general bashing SCTs on 2S.

 

[biggman100]

Grass is an RC's worst enemy IMO. So many variables when including that type of surface into one's gameplan. Even larger more powerful RCs with wider tires, to help the platform kind of float on top of grass, get bogged down. Again, "grass" has so many variables making it even more important to have an infrared thermometer in your arsenal to help manage your RC's gearing.

I usually only ever bash them, on pretty much every surface you can think of, in pretty much any weather. The whole grass thing came about only because a bunch of us got together and made a, run what you bring, almost no rules, race by mowing a track in the yard. There are a few of us that just like to goof off mostly, so it seemed like a workable solution. I am usually very diligent about keeping an eye on temps, especially given how hard I can be on stuff. It's not uncommon for me to do an impromptu drift course at a concrete skate park, or run 4WD's in 6 inches of snow, or bury a truck in mud, so I have learned what to look out for.