jamaraluke Posted January 26, 2021 Share Posted January 26, 2021 (edited) Hi all, would it be at all feasible in your opinion to buy a Kraton EXB roller and temporarily install the components from a cheap donor car just to get it going? And progressively update what's required? I cannot find the diameter of the EXB pinion, to figure out if it would fit on the motor shaft. Here the specs of the donor parts: ESC: Hobbywing SC8 RTR 25 kg metal servo Dumbo RC X6 Gyro receiver Motor: KV: 4370 Watts: 550 Max Voltage: 2S Max Current: 46A Max RPM: 50,000 Length: 50mm Outer Diameter (w/fins): 35.8mm Weight: 168g Shaft Diameter: 3.17mm Turns: 9T Rotor (Pole): 2-pole Stator Length: 25mm (motor supports 3s) New 3S Battery I would purchase separately. Edited January 26, 2021 by jamaraluke Quote Link to comment Share on other sites More sharing options...
monkeyboy_uk Posted January 26, 2021 Share Posted January 26, 2021 Not with those components. On 3S the SC8 is only rated to 4000KV or less. The motor is really meant for a 1/10th scale, you will cook it. You could try running those parts, but once they go up in smoke, you'll have to replace them anyway which would be a waste imo. Also I would start with 4S, 3S might be a bit pedestrian. Have a look at something like a Hobbywing MAX8 combo instead. 1 Quote Link to comment Share on other sites More sharing options...
jamaraluke Posted January 26, 2021 Author Share Posted January 26, 2021 thanks! Will work on this scenario. I was fearing the same. Quote Link to comment Share on other sites More sharing options...
Alex97 Posted January 26, 2021 Share Posted January 26, 2021 The ESC is ok personlly i'd want 150a, motor is far too small and you'll want to run 4-6s. If you are on a budget then look at this... https://www.aliexpress.com/item/33018347136.html?spm=2114.12010612.8148356.32.525d45d99itEL2 (1700KV on 4s) That ESC should be ok with the above motor just keep an eye on the temps and gear correctly Quote Link to comment Share on other sites More sharing options...
Bert_w164 Posted January 26, 2021 Share Posted January 26, 2021 Hey, I totally understand and appreciate the thought process behind what you're trying to do here...also when you build a balls to the wall spec and know that's it...it can be all a bit lackluster, the progressive growth is fun eh! Anyway, will a 3.175 shaft be adequate for the pinion you intend to use? I attempted similar to you in terms of I had a sacrificial 2845 motor I was going to run in a 1/8 rolling chassis while I wait for my 4274, but pinion and mounting issues threw a spanner in the works. Alternatively you could find a cheap motor in the 40XX size and run that until you get the motor you really want. 1 Quote Link to comment Share on other sites More sharing options...
Kpowell911 Posted January 26, 2021 Share Posted January 26, 2021 Id get a cheap black can 4074 sub 2000kv motor, run that TX/RX and ESC on 4S and go from there? Orrrr Buy the non EXB RTR Kraton, and upgrade it as you break parts with M2C/ EXB bits? 1 Quote Link to comment Share on other sites More sharing options...
m4inbrain Posted January 26, 2021 Share Posted January 26, 2021 (edited) 33 minutes ago, Guns said: Id get a cheap black can 4074 sub 2000kv motor, run that TX/RX and ESC on 4S and go from there? Orrrr Buy the non EXB RTR Kraton, and upgrade it as you break parts with M2C/ EXB bits? This. Either get the normal Kraton v5, which is a reasonable piece of kit, or get a decent ESC/Motor that's rated for what you're doing. A motor can be had for £50 (Hobbystar/Surpass Hobby Rocket 4274/1650kv), for ESC a Max6 is the cheapest i'd go. None of the components originally suggested by the OP would work in an EXB, apart from the servo. The motor wouldn't last more than 5 minutes, and the ESC isn't rated for a heavy truck like the Kraton either. Should go without saying that a 1/10 buggy/sct setup isn't suitable for a heavy 1/8th truggy. That's just me though. Another option would be to buy a used Kraton v4 combo (2050kv/BLX185), should be plenty of them around from people who upgraded their Kratons from stock to Max6. Edited January 26, 2021 by m4inbrain Quote Link to comment Share on other sites More sharing options...
Alex97 Posted January 26, 2021 Share Posted January 26, 2021 46 minutes ago, Bert_w164 said: Hey, I totally understand and appreciate the thought process behind what you're trying to do here...also when you build a balls to the wall spec and know that's it...it can be all a bit lackluster, the progressive growth is fun eh! Anyway, will a 3.175 shaft be adequate for the pinion you intend to use? I attempted similar to you in terms of I had a sacrificial 2845 motor I was going to run in a 1/8 rolling chassis while I wait for my 4274, but pinion and mounting issues threw a spanner in the works. Alternatively you could find a cheap motor in the 40XX size and run that until you get the motor you really want. A 380 motor wouldn't move a 1/8 and if it did I couldn't imagine it would last long. Quote Link to comment Share on other sites More sharing options...
Bert_w164 Posted January 26, 2021 Share Posted January 26, 2021 8 minutes ago, Alex97 said: A 380 motor wouldn't move a 1/8 and if it did I couldn't imagine it would last long. That did cross my mind, it's a sacrificial motor out of my Xinlehong Q902 so for giggles I wouldn't have minded it burning out 😁 or seeing how long it can survive. Quote Link to comment Share on other sites More sharing options...
mydoddy69 Posted January 26, 2021 Share Posted January 26, 2021 I’d save even more and get this https://www.modelsport.co.uk/corally-kronos-xp-6s-monster-truck-1-8-lwb-brushless-rtr/rc-car-products/444328 .or the newer version https://www.modelsport.co.uk/corally-kronos-xp-6s-monster-truck-1-8-lwb-brushless-rtr-2021/rc-car-products/1334794 Almost the same as the Arrma rtr but cheaper and by the looks almost as good as well 👍 Quote Link to comment Share on other sites More sharing options...
jamaraluke Posted January 26, 2021 Author Share Posted January 26, 2021 Wow, I would never imagine I was going to receive this much feedback! I think my mind is made up now, thank you all. I'll go with the Big Rock, less complexity and risks 1 Quote Link to comment Share on other sites More sharing options...
m4inbrain Posted January 26, 2021 Share Posted January 26, 2021 Not the worst choice, my neighbour loves his Big Rock. 1 Quote Link to comment Share on other sites More sharing options...
Kpowell911 Posted January 26, 2021 Share Posted January 26, 2021 I own an EXB and initial impressions are great. But its cost me £900, I'm sure the RTR 6S V5 would have been 99% as good Quote Link to comment Share on other sites More sharing options...
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