RX8 or MMM combo?

[Unsullied_Spy]

I'm building up another Hyper 7 (slowly but surely) but I don't know which powerplant I want to put in it. Most everything I bash with uses a MedUsa motor but I feel like doing something different for this build. I've already got a MMM that I run in my Muggy and it's a good ESC and the 2650 combo would be good for my use, but I'm tempted to try out the RX8 combo since I already have the MMM. I don't like how short the warranty is, I don't care for sensored motors, and it costs quite a bit more than a MMM combo but it sure is tempting to try one out. I'm building this one to be an offroad-only basher (my TQ is onroad, so the PCR will be offroad) and all I really need is enough power to bash with and stay cool. I like my stuff overpowered but I think with this I'll take a more reasonable approach so it'll be easier to bash.

[E-Revonut]

For bashing purposes only the MMM combo will suit you well. I too am tempted to get a RX8 combo but for racing with my truggy. A sensored system is undoubtedly smoother and better for racing.

[jhautz]

The beauty of the RX8 is that it is a sensored system only at start up, making it start perfectly every time, but it still has all the power of a sensorless system.

If you intend to race it its the most precise feeling speedo I have ever touched. For bashing either will do just fine. Although I still never like the huge goofy case on the MMM. And having to remove it to change the fan that dies every other run.

[Unsullied_Spy]

I do like the way my MMM bashes as far as throttle control. I haven't had any issues with cogging, so the sensored startup doesn't mean anything to me. There aren't any races around here right now but there may be some soon and I may try it out. Not sure on that right now. I like the design of the MMM and how enclosed it is. It's too bad that it needs the fan to cool it with all that plastic covering the heatsink but my fan has never given me any trouble.

[jhautz]

Sounds like you know what you need then.

[Unsullied_Spy]

Originally Posted by jhautz

Sounds like you know what you need then.

Sure the MMM is nice, but since I already have one I could always try out the RX8. Is there anything to the RX8 other than sensored start-up? If I'm going to spend the extra $70 for one I'd like to get something extra out of it. I do like that they make lower KV motors for them, I'd like to run 5s in it sooner or later and that would push the 2650 too far.

[whitrzac]

Originally Posted by Unsullied_Spy

Sure the MMM is nice, but since I already have one I could always try out the RX8. Is there anything to the RX8 other than sensored start-up? If I'm going to spend the extra $70 for one I'd like to get something extra out of it. I do like that they make lower KV motors for them, I'd like to run 5s in it sooner or later and that would push the 2650 too far.

210amps continuous, solder posts, better quality, better everything except the warranty


something to think about, but dodge(known for tranny failures) has a lifetime warranty on the drivtrain, ford, toyota, honda, etc don't...


BTW the tower super saver club has a 60 off of $300 now...

[Aceldama]

Originally Posted by Unsullied_Spy

Sure the MMM is nice, but since I already have one I could always try out the RX8. Is there anything to the RX8 other than sensored start-up? If I'm going to spend the extra $70 for one I'd like to get something extra out of it. I do like that they make lower KV motors for them, I'd like to run 5s in it sooner or later and that would push the 2650 too far.

I've been tossing around the idea of MMM vs RX8 for a while now and here's what I've come up with:

-I plan on running 6s and there isn't a MMM motor that fits this application. So I either need a Neu, which is going to drive up the cost (to well over the cost of an RX8). Or I need a Medusa which isn't an ideal off-road solution due to the open can and non-captured end bells. The RX8 has a great selection of KVs (even if they seem to be a bit underrated by a variable amount of KV depending on who you ask).

-MMM includes the castleLink and RX8 requires that I pay an additional $35 for hotwire which, honestly I feel is a bit of "nickle and dime" for an already $340 system.

-There are tons of MMMs out there but there are also lots of failures. There aren't a lot of RX8s out there but I haven't heard of one failing yet.

-Sensored vs. sensorless: All of my systems have been sensorless and they perform great. I have tried my friends sensored Novak on his 18T and while I do notice the smoothness in the throttle it doesn't add up to anything in our street races. On the other hand, I feel it's better to have it then to not have it.

What is pushing me toward the RX8 is really the motor selection. I don't feel like hunting down and then paying for a Neu with a bolted can. And 2200kv is just way too much for 6s. And until I hear about an RX8 going up in smoke I consider it the more reliable system (just give it a month...).

[_paralyzed_]

Originally Posted by Aceldama

And 2200kv is just way too much for 6s.

umm, it was made to run 6s. not too much

[whitrzac]

you don't need the hotwire!!! the tekin esc's are brainless to program, unlike the castle's...


the only thing on the rx8 that you gain with the hotwire is the timing adjustment.

[Aceldama]

Originally Posted by whitrzac

you don't need the hotwire!!! the tekin esc's are brainless to program, unlike the castle's...


the only thing on the rx8 that you gain with the hotwire is the timing adjustment.

The timing adjustment seems pretty important considering Tekin themselves are changing the default timing value with the new software download since they think it was a bit high from the factory.

TeamTekin on RCTech:
"The default timing on the Rx8 units shipped was 32 and would raise the kv another 50 or so on each motor. In the new software coming shortly the default has been reduced to 10 as it was suppose to be to begin with."

At such a close time to the release of the product you're going to want the firmware revisions that are definitely coming, which means you're going to want the Hotwire.

[BrianG]

Speed runs...

Originally Posted by Unsullied_Spy

I'm building up another Hyper 7 (slowly but surely) but I don't know which powerplant I want to put in it. Most everything I bash with uses a MedUsa motor but I feel like doing something different for this build. I've already got a MMM that I run in my Muggy and it's a good ESC and the 2650 combo would be good for my use, but I'm tempted to try out the RX8 combo since I already have the MMM. I don't like how short the warranty is, I don't care for sensored motors, and it costs quite a bit more than a MMM combo but it sure is tempting to try one out. I'm building this one to be an offroad-only basher (my TQ is onroad, so the PCR will be offroad) and all I really need is enough power to bash with and stay cool. I like my stuff overpowered but I think with this I'll take a more reasonable approach so it'll be easier to bash.

Having used both the rx8 and the MMM/Neu now, I can say without question that the rx8 is leagues better. The throttle control is just beyond belief. The MMM is smooth, but the rx8 has ZERO cogging from a standstill. You could go rock crawling with this system. It is the best of both worlds. The MMM low power start up isn't even comparable to the smoothness.

The case on the rx8 is way more durable too. You can screw the case down to a mounting plate and it doesn't need zip ties because the case is held together with four screws in very good plastic, not the cheapo plastic tabs like the MMM.

The motors are absolutely top notch and I think a tad more powerful than the Neus. The solder post prevent the wearing out of the windings that occurs so often on Neus, not to mention direct soldering so you don't have to worry about the bullet plugs coming undone. The system runs cool too.

Tekin has absolutely done their homework on this ESC and Motor and all I can say is that they have raised the bar to a new level.

Not to bash the MMM, as I have owned five of them along with countless variations of Neu motors, but the Tekin takes the best off it all and puts it in one package. The MMM/Neu setup is great, but I think they are going to have to do a few tweaks to put it on the same level as the Tekin (particularly around the case design).

[Unsullied_Spy]

I like the mounting of the RX8, that's for sure. Every other ESC I have (aside from my boats) is zip-tied in. I don't mind zip-ties though, they are a cheap and reliable mounting option that also make it easy to remove.

People talk about solder posts like they're the golden egg, but I really don't see the point. With motors like my MedUsa motors where the windings are coming out the can I can see why it would be good, but the CC Neu motors have 100% of the windings inside the can, the wires are just normal wires and don't need any soldering (plug n' play). I haven't had an issue with the bullet connectors on my MMMs, but if I buy an RX8 and need to remove it or the motor from my Buggy for whatever reason does this mean I'll have to de-solder them each time unless I want to remove them both?

[hootie7159]

I just got my rx8 yesterday and went out to prairie city today and this system kicks ass ..blah..blah..blah..etc..etc..etc....you all get the point however, the things that i really like the most about it is the ease of track side programming...it has these leds with abbreviations next to them to let you know where you are in the programming mode/the ability to take the fan out without taking the case apart.... and i also like the smoothness or sensorless as well...i used to run a CC/CC NEU 2200kv combo in my rc8t on 4s and now i've swapped it with the rx8 w/1700 truggy motor on 5s and in all honestly...yes its smoother due to sensorless but you won't see the big difference IMOH unless your cruising at less than 2-5mph on the track...but then again, my MMM/CC NEU combo never had an issue with cogging even with stabbing the throttle (in my rc8t on 4s).....sooooo i see the tekin system as just another option in the world of 1/8th scale conversion and (i believe someone already mentioned this) we can call this system successful yet until its been around for at least a month......i personally don't do ridiculous speed runs but I know a bunch of you guys do.....so in my last and final honest opinion, the MMM/NEU=bashers.....rx8=racers.....but we still have to wait until castle comes out with the 1800kv motor :)


oh yeah...and i soldered on bullet connectors b/c i hate solder posts...