Felony Spektrum 8s esc and castle motor

[john 8s]

Spektrum 8s esc with castle1650 kv good idea thought or suggestions

 

[Engineer]

Welcome.

What are your intentions and how do you plan on using it (platform, gearing)? At first blush, it seems like a waste of a nice sensored motor to use a non-sensored ESC.

 

[Moirae]

Agree with engineer.

 

[john 8s]

WELL ,i bought a felony with the 8s combo and a 32t pinion.loving it at 90mph.just wanting a little more .thought a little more kv would be nice.i am not opposed to get the mmx8s 1650 combo,just seeing what my options are.

 

[Diem Turner]

The MMX8S would be a step up. However...I've said this many times before and I'll give you the same advice. The MMX8S has high ripple voltage and will need a decent cap pack. For the same price you can get an XLX2 which doesn't need one and will give you 200A+ more power capability. The stock setup will require a little bit of modification to make it fit, but it can be done. I got the MMX8S first myself and it didn't take that long before I wished I had spend the extra few dollars to get the XLX2. But that's just me, YMMV. You say you want a little more now...you'll, more than likely, want a little more later. And a little more after that. My recommendation would be to get the XLX2 if you have the coin, but the MMX8S is a very capable ESC as well.

 

[john 8s]

thank you,i have been doing some research on this forum and reading different posts.im not new to rc,just new to the arrma side of vehichles and electronics.so right now i run 8s ,32tpinion in a pps mount.i do have a 35t i am going to try this weekend as long as the weather holds out.temps on motor and esc are good with the 32t.

 

[Engineer]

Castle isn’t the only game in town if you’re looking for a little more oomph. TP Power motors work well too and you can find something that works with your Firma 160 ESC. A 4050 sized TP Power would fit without having to flip the motor mount.

 

[john 8s]

Thank you for replies. I have been looking at tp and Poseidon motors also. With spektrum 8s esc already having a cap pack,i am just wondering how much it can handle even though the box said 100mph capable.

 

[Diem Turner]

Thank you for replies. I have been looking at tp and Poseidon motors also. With spektrum 8s esc already having a cap pack,i am just wondering how much it can handle even though the box said 100mph capable.

The Spektrum should be good for somewhere around 105-110mph. This has nothing to do with the cap pack mind you. That's just the amp limit of the ESC that will cut you off.

 

[john 8s]

So the cap pack is like a fail safe? I have one on an castle xlx , one of the old style and 800 kv in my gas converted to electric redcat rampage. The guy that did my solder job said I should a cap pack and i didn’t question it as I was new to the hobby back then. I have it though I don’t use it as much as it’s huge to haul around

 

[Diem Turner]

What the cap pack does it reduce ripple voltage by storing energy as a buffer to smooth out voltage modulation under heavy load. It helps to protect the ESC as a primary function, but they also help the batteries. The first XLX and MMX8S both have high voltage ripple values without a cap pack. As a general rule of thumb, you want ripple voltage to be lower than 10% of total voltage, lower than 5% is optimal. Castle provides ripple voltage values in their data logging.

 

[Engineer]

A capacitor is a device that can release its stored energy very quickly and think of it as something that can supplement energy when there is a sudden demand. But in the sizes that are in a car, it can’t supplement energy for very long so it’s only good for very short spikes. It has nothing to do with the average current draw of a motor and the ability of the ESC to supply that.

 

[john 8s]

Good info thank you. I never really thought about these kinds of things until I started to push my cars hard. I started wit an erevo 80 mph stock, just big gearing. Rustler 4x4 big gears Poseidon 2650, mamba monster on 5s=flames