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View Full Version : Summit on 4S, help me choose the right motor for the RX8 system!


RCPao
02.17.2011, 12:43 PM
Hi all, I have a Stampede VXL and an E-Maxx BL (IMO brushless is the only way to go and one of the main reasons I got back into the hobby a couple of years ago).

Now, I have just got a Summit, I have it since 2 days, and I am of course going to put a BL set in it ASAP (the truck is a lot of fun but the stock performances are a joke).

To explain what I am looking for it's probably best to describe how I use my E-Maxx because use will be similar.
I have in it a Mamba Monster 2200KV Combo and I always and only run it on 4S lipos (I have two SPC 8000 2S and four Turnigy 5000 2S, I am going to buy some more 2S lipo BTW).
I run 95% of the time offroad in the most diverse conditions and do pretty much everything with it except long runs at or near top speed.

Frankly it would be easier and cheaper to just go with another MMM, I even already have the CastleLink, but given the nature of the Summit I think it practically "must" have a sensored BL system!

So, given the above, which RX8 motor should I get? The choices are maybe even "too many"! :D

The big real question is: which version (KV) works best for me??
Bearing in mind that I only run 4S, I am not interested in very high speed (but on open field still like a bit of WOT), I like torque, I drive almost only offroad and sometimes in very hard conditions which one works best for me? Under the mentioned premises which will be the most efficient (i.e. lower temps, longer runtimes) but still plenty powerful and fun? 2000 or 1700?? (I have already ruled out the 2250KV and, obviously, the 1550 and 1350)

TIA!


P.S. Has somebody any idea about how top speed would compare between stock and the 1700KV with stock gear ratio?

Arct1k
02.17.2011, 01:03 PM
MMP and the 1512 1800kv would work fine IMO...

lincpimp
02.17.2011, 02:36 PM
4s in a MT can be a higher amp draw system. For ultimate durability I would stick to the 1/8 scale systems. Sinvce you mention tekin, and want the sensored startup (sounds like a good idea to me), I would say to go with one of their truggy length motors.

A longer motor makes more torque, and you need alot to et big/heavy tires moving. Anda longer motor handles a load better, staying cooler. I would go with the 2000kv truggy motor. You will have more motor speed, and you can always gear down if you have too much top speed, and reverything will run cooler. 1700kv would be better for 5s or even 6s.

That would be what I would do. Summit sounds like a cool truck, I may get one, and would like a good low speed system, maybe run a MMpro on 6s with a sensored motor, tekin or similar.

TekinTeamMgr
02.17.2011, 05:41 PM
For 4s try the 2250 system.

fastbaja5b
02.18.2011, 03:24 AM
Abandon the Brushless thing, throw in a Dewalt 14.4V and an 18t pinion which retains the waterproof ability but gives it a decent performance upgrade as well.