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Found 2 results

  1. A bit of a recap before I start the current project thread: This is one of my two Traxxas cars - an E-Maxx Brushless edition that I bought used from a friend a few years ago (the other car being an E-Revo 1/16 VXL that I bought new with some bonus money a long while back and hasn't been use in years since I no longer have any batteries that fit). It came to me as a runner, but with some splits in the tyres, a bent shock shaft and a very tatty original body. I threw the original away and fitted a Parma El Camino that I've had floating around for years. Here's a pic from end of summer 2018 (if memory serves it was a pretty chilly day), when it was still reasonably new to me and my daughter was only 18 months old (and was still happy to sit in the workshop while I was tinkering instead of insisting we go inside and watch 3 entire series of Bitz & Bob back-to-back) The first time I drove the big maxx would probably have been in the summer of 2018. I fitted two 2S LiPo square packs (now long since puffed and disposed of) but didn't have any Traxxas connectors, so I had the banana plug flylead-to-Deans adaptors, then Deans-to-Traxxas adapters to hook into the ESC. Nobody had ever pointed out that this wasn't a good idea... I ran it in some local fields for 15 minutes before it suddenly jerked to a halt and flipped upside down. Clouds of smoke billowed out from inside and I feared my ageing LiPos had gone nuclear, and rushed over to get them out before they took my chassis up with them. On closer inspection the smoke had come from the ESC - it had got hot enough to melt the solder on the battery positive lead. I thought maybe this was the extent of the damage, but when I got it home I found all the caps had blown and the heat had damaged the main board. Resoldering the battery lead didn't fix it. Which was a shame, as it was a 6S-ready Mamba Max ESC and very expensive to replace. In the end I went with a Hobbywing, which IIRC is 6S ready although I have no intention of going that fast. It was a lot cheaper and fitted neatly in the chassis. Since then it's had very little use. The odd run here or there. Many of my packs are coming to the end of their useful life now and it's hard to justify burning through a pair of charged packs at once when I could get more than twice the runtime with my 2S cars. Also I don't often go anywhere where the E-Maxx can be run - it's not permitted on most of the open bash days, I can't run it in the garden, and I can't run it in the fields if it's busy. But recently I did find some places where it would really come into its own, so I decided I'd pull it down off the wall and give it a bit of a refresh. So - here it was on Sunday when I grabbed it off the wall.
  2. So, the 6s compatible Castle Creations Mamba Monster ESC in my newly-acquired, used E-maxx Brushless fried itself on its first outing. I'm thinking possibly a ripple current caused by using a pair of 2s 4200mAh LiPos that couldn't handle the current draw has caused the capacitors to fail. I must admit I didn't realise this was a possibility until after I'd blown the speedo and searched online for a possible cause. So, I now need to replace the speedo and get hold of some better batteries before I end up with yet another useless RC truck I've found a used example of the same speedo for £90. I was quite happy with the performance of the Mamba Monster on 4s but that seems like a lot of wedge for a used speedo, especially as it'll have no warranty if I fry it again. (It looks like some Mamba Monster speedos had a habit of frying themselves and were replaced under warranty). The current model (Mamba Monster Max) retails for £175. That's a lot of cash for someone who isn't supposed to be spending money on toys. I've got a baby due in just over a month! It's especially a lot of cash if I also need to fund two new 2s packs. HobbyKing list a Turnigy 1:8 ESC: https://hobbyking.com/en_us/turnigy-160a-1-8th-scale-sensorless-esc-w-fan.html It'll only go to 4s, but then I was unlikely to run the Maxx on 6s anyway as I don't have any 3s packs. I already have a Turnigy programming box for my 1:10 TrackStar Turbo ESCs but I don't know if it will work on the 1:8 ESC. At less than £50, it seems like a bargain. I love the TrackStar series and use them in my HotShot and my CS drift car. HobbyKing also list their own 1:8 ESC: https://hobbyking.com/en_us/hobbykingr-tm-x-car-beast-series-esc-1-8-scale-150a.html £60 and it'll run up to 6s. I'm not sure if either of these will give the same performance as the Mamba Monster; part of me is reluctant to spend any money if I'm going to end up with a less good truck. And so onto batteries - I'll want hardcase LiPos of at least 5000mAh with at least 30C rating. I've used Turnigy NanoTech batteries for a while without any issues but it was a pair of 4200mAh NanoTech stick packs that were in the truck when the speedo smoked itself. I guess it's worth spending on good quality packs if it'll protect my investment in a good quality speedo. Any advice gratefully received
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