Mamba86 Posted December 10, 2021 Share Posted December 10, 2021 I am nearing completion of my RC8B3.2E buggy build. Its been good fun thus far and I need to start thinking about electrics. The buggy has been built for the sole reason of something to do and a nice reintroduction to RC. I have no intention of racing for example. I thought I had a rough idea about what I wanted but certain variables keep confusing me. I do want it waterproof. I was thinking of running say a 1900KV motor but read somewhere that I would need to increase kv of motor if running on 3s instead of 4s (my plan is 4s single btw). I also would welcome advice on a decent servo. Price is not priority but I don't want it to be mega expensive. I accept there is loads of advice online but when I research it I end up getting more confused. I don't want to buy the wrong set up either. Any advice greatly appreciated. Take care Nick Quote Link to comment Share on other sites More sharing options...
Surfer99 Posted December 10, 2021 Share Posted December 10, 2021 (edited) I’ve been looking at the hobbywing 1900kv with one of the variants of their XR8 ESC, seems a popular choice in the 1/8th buggies. The G2 pro seems to be the latest one with some tweeks over the earlier version. Edited December 10, 2021 by Surfer99 1 Quote Link to comment Share on other sites More sharing options...
Mamba86 Posted December 10, 2021 Author Share Posted December 10, 2021 That's the sort of setup I was thinking about. I was just worried about the relationship between kv of motor and lipo power. Quote Link to comment Share on other sites More sharing options...
lorrylemming Posted December 10, 2021 Share Posted December 10, 2021 My RC8B3.1E has a Hobbywing max8 and 2200kv 4274 motor running 4S. I'm very pleased with this setup, its very quick but being a buggy still easy to control. Not stupid fast. The rc8b3 doesn't have enough room for most 6S batteries and 3S is too low so go with 4S. Motor kv anything between 1600kv and 2400kv with a 40mm can is fine. Higher kv will give a bit more speed but it's a small difference, especially if you gear up the lower kv motors. If you want an actually waterproof system then you need to run something sensor less like the max 8. Sensor leads aren't waterproof. If you just want to run in the rain then you'll be fine with sensored, the buggy shell will keep most of the spray out. I'm running a Highest B210 servo which is pretty fancy. Any servo with 25kg/cm of torque will be strong enough. Speed wise faster is better, just depends how much money you want to spend. 1 Quote Link to comment Share on other sites More sharing options...
Mamba86 Posted December 10, 2021 Author Share Posted December 10, 2021 Thanks that's really helpful @lorrylemming. I may come back to you with more specific questions. Your setup looks ace. Quote Link to comment Share on other sites More sharing options...
lorrylemming Posted December 10, 2021 Share Posted December 10, 2021 (edited) Couple more points, get an ESC with a higher voltage BEC and run a high voltage servo. Nearly all 1/8th ESCs have this feature nowadays. Tekno RC pinions are really good for this buggy. Most pinions won't fit because the motor mount doesn't have enough clearance. RPRC stock them in the UK. Associated pinions fit too but tekno are easier to find. Trim the front of the body where the top arms are mounted, other wise the arms make it flex and crack. You'll see what I mean when you cut it out. Vent holes in the body also make a big difference, you can see them in the picture above. I run the rear hub upper bolts the opposite way round to the manual, this seem to reduce the amount of stones jamming up the wheel. Upgrades on mine include Tworks skid plates, DE racing bumper, aluminium wing nuts for bling and covered wheel nuts to stop crud getting inside. I've got a pack of mugen drive pins to swap in when the stock ones wear out but that's it. Edited December 10, 2021 by lorrylemming 1 Quote Link to comment Share on other sites More sharing options...
Mamba86 Posted December 10, 2021 Author Share Posted December 10, 2021 You've got aftermarket suspension arms on the front? I am a bit thick but how do you mean the rear hub bolts the opposite way round? I will save for the Highset servo I think. Quote Link to comment Share on other sites More sharing options...
lorrylemming Posted December 10, 2021 Share Posted December 10, 2021 The B3. 1e has a different style of arm but same shape. If you look at the picture below you can see where the body over hangs the arm. This needs trimming. The rear upper hinge pins have the nut on the front as per the instructions, I swapped this round to the back. Just to show you another option here's a cheaper servo that would be perfectly good. I would hate to be one of those people online who says you need to spend loads. https://www.modelsport.co.uk/product/power-hd-servo-wh30kg-waterproof-full-alu-case-digital-hv-1332979 1 Quote Link to comment Share on other sites More sharing options...
Mamba86 Posted December 10, 2021 Author Share Posted December 10, 2021 Thanks for the pics. In regards to the electrics I will buy them bit by bit. Much rather not have to buy twice if you know what I mean. 1 Quote Link to comment Share on other sites More sharing options...
Stormbringer Posted December 10, 2021 Share Posted December 10, 2021 My son and iused this in our hyper 7 and my hyper st conversions and comes with a programme card to set up the parameters to how you like https://www.modelsport.co.uk/product/hobbywing-ezrun-max8-with-2200kv-motor-combo-397267 2 Quote Link to comment Share on other sites More sharing options...
Mamba86 Posted December 11, 2021 Author Share Posted December 11, 2021 Can anyone tell me what these are for? I have looked through the instructions 100 times now and can't work it out. I am praying they don't go somewhere deep in the buggy lol. Quote Link to comment Share on other sites More sharing options...
lorrylemming Posted December 11, 2021 Share Posted December 11, 2021 They're servo risers that go under the servo wings. Quote Link to comment Share on other sites More sharing options...
Mamba86 Posted December 11, 2021 Author Share Posted December 11, 2021 6 minutes ago, lorrylemming said: They're servo risers that go under the servo wings. Thank you. Quote Link to comment Share on other sites More sharing options...
Mamba86 Posted December 13, 2021 Author Share Posted December 13, 2021 Transmitter ordered. Bits outstanding: Motor and ESC (probs getting HW Max8 combo). Servo 4S battery (looking at a cheapish Gens Ace) Pinion (not sure how many teeth though) Quote Link to comment Share on other sites More sharing options...
lorrylemming Posted December 13, 2021 Share Posted December 13, 2021 (edited) Mine has a 15t with the 2200kv combo motor, I did try a 16t but things got a little warm during the summer so went back down. https://www.rprcdistribution.com/product-page/tkr4175-m5-pinion-gear-15t-mod1-5mm-bore-m5 EDIT! Just remembered the B3. 2e has shorter diff ratios to the B3. 1e so you might want the 16t pinion. Edited December 13, 2021 by lorrylemming 1 Quote Link to comment Share on other sites More sharing options...
Stormbringer Posted December 13, 2021 Share Posted December 13, 2021 10 hours ago, Mamba86 said: Transmitter ordered. Bits outstanding: Motor and ESC (probs getting HW Max8 combo). Servo 4S battery (looking at a cheapish Gens Ace) Pinion (not sure how many teeth though) Have you looked on Amazon for lipo batteries ? ZEEE,Vorjay and sundapow are pretty good 👍 1 Quote Link to comment Share on other sites More sharing options...
Mamba86 Posted December 13, 2021 Author Share Posted December 13, 2021 Not really thought about Amazon to be fair. The choice for single 4S isn't that great to be fair. Quote Link to comment Share on other sites More sharing options...
Mamba86 Posted December 15, 2021 Author Share Posted December 15, 2021 Taking shape. Tyres hopefully coming tomorrow. Motor and ESC Friday. Though I'm 43 my parents are getting me a transmitter for Christmas 😆😂 1 1 Quote Link to comment Share on other sites More sharing options...
Mamba86 Posted December 17, 2021 Author Share Posted December 17, 2021 Have I attached this bracket to the ESC unnecessarily? I could just take the wire straight under the battery/esc tray without it being raised on the bracket provided by HW. It obviously means I have to take the whole tray out and re-thread the wire but that's cool. Quote Link to comment Share on other sites More sharing options...
Mamba86 Posted December 17, 2021 Author Share Posted December 17, 2021 Scrap that last post. I have removed it and threaded it under the battery tray. Cleaner and lower centre of gravity. Quote Link to comment Share on other sites More sharing options...
Mamba86 Posted December 17, 2021 Author Share Posted December 17, 2021 I have a 4s battery coming. However, the esc has dual xt90 to run 2x2s. I assume its OK if I just connect a loop connecter to one of the XT90's? I was considering cutting one off but don't wish to void warranty and also gives me option of running 2x2s should I wish. Quote Link to comment Share on other sites More sharing options...
Redback Posted December 17, 2021 Share Posted December 17, 2021 Yep, loop it you will want that other connector for dualies and as the connectors are aftermarket, you wont loose warrenty swapping plugs afaik. 2 Quote Link to comment Share on other sites More sharing options...
Stormbringer Posted December 17, 2021 Share Posted December 17, 2021 With some makes changing the connecters can void your warranty Blade helicopters are a prime example but some rc car companys could be the same so check 1st 2 Quote Link to comment Share on other sites More sharing options...
Redback Posted December 17, 2021 Share Posted December 17, 2021 1 hour ago, Stormbringer said: With some makes changing the connecters can void your warranty Blade helicopters are a prime example but some rc car companys could be the same so check 1st Yeah true but this is what confuses me. Most my hobbywings had the connectors fitted by the model shop (you pay for them to do it etc), so does that mean they void the warrenty fitting them? Now i fit the connectors does that mean its void once you wire a connector too it? 1 Quote Link to comment Share on other sites More sharing options...
Yrkoon Posted December 17, 2021 Share Posted December 17, 2021 1 hour ago, Redback said: Yeah true but this is what confuses me. Most my hobbywings had the connectors fitted by the model shop (you pay for them to do it etc), so does that mean they void the warrenty fitting them? Now i fit the connectors does that mean its void once you wire a connector too it? i think hobbywing are fine with after market connectors, they even had a wee bit heat shrink in the boxes for my max 8 and max 10 🙂 1 Quote Link to comment Share on other sites More sharing options...
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