9xl, 5s, Quark 125b + Lipo battery holders?
 

So I am planning on converting my savage to brushless. I have to ask just to make sure though. I have read a lot of the threads on this forum and have come to the conclusion this would be a reasonable combo 9xl, 5s, Quark 125b. Would this setup stay at a reasonable temp with the right pinion in a savage? Mine will have the 3 speed in it as I don't really have the kit to make a slipperential. Also for battery mounting I was looking a getting a 3s and a 2s 8000mah lipo in series and mounting one on each side of the truck. I was looking at serums revo conversion and wondering if anyone knows where to get cf U section or if it even exists. CF U section would make really cool battery holders I would think.

The 9XL is a good all-around motor. But since it is not as efficient as the higher-end motors, it WILL heat up after a while no matter what. If you run for ~20-30 minutes, let rest for ~20 minutes, and then run again, it should be fine. But if you are looking for a non-stop running motor, I would look at a Neu 1512 or 1515 series, or Lehner 1940 or 1950 series.

I am not familiar with the Savage, but most auto-shifting trannies I've seen cannot use the motor for braking or reverse because of a OWB. Besides, these motors have enough torque for ~35mph that you don't really need multple gears unless you are trying for some VERY high speeds.

CF battery holders are quite strong and can be made from L shaped pieces to form a U shape. Graphiteelegance.com used to be a good place to go, or try McMastercarr.com. Be aware that CF is electrically conductive so if you have any chafe points in the wrong place, it could short out the battery. The same is true with Al too, but most people don't think CF is conductive.

If you are runnning the 3 speed tranny, just use a 20-22T pinion with the 47T plastic spur gear and get a heatsink and fans for both the Quark and Feigao motors and you should be good to go.

The U section of CF would probably need to be be custom. The guy at www.graphiteelegance.com could make it if he ever comes back form vacation. Other than that there should be other places that can make, but it would probably cost more. Just do a web search.

Google has failed me on the cf stuff. It brings up complete rubbish. Maybe I don't know what to search for. It is a shame graphite elegance seems to have given up. I'll check McMastercarr.com out.

On the motors I would love to get a Neu 1515 but I don't think the funds are going to stretch that far. I was going to heat sink the motor as I knew it would run a bit hot. The quark seems to have a reputation for running hot. what other esc are similarly spec'ed. I won't be too upset if I burn a motor but to have an esc die at $250 each I'll do more then cry.

Also any one recommend a fan? I know people use pc fans but the ones I can get would be far too big.

Edit: I worked out why google is failing me. bloody Americans and their crazy spelling. What's 'fiber'.

lol, thats funny. =)

As for another ESC, the MGM Compro 160 has been running very cool for people with it, and it can actually run 6s successfully if you ever want to unlike the Quark. There is also computer programming for it, so that makes it even easier. same price as the quark as well.

Keep us updated with pictures of the Savage. BTW - who is making your motor mount or where are you getting it from?

Does the MGM Compro 160 support 4 pole motors (a neu 1515 may come one day)? Did I read it right. Does this not need a separate bec even when running 6s?

As far as motor mount goes I was going to get the Kershaw Designs one but I wanted one that mounts the engine lower for a better cg and to keep the motor out of harms way. I discovered that one of the guys at work has access to a workshop and can make me the mount. I just need to draw one up. Does anyone have a low mounting engine plate design in cad that I could possible use? I know it's a big ask as I would be copying someone else's hard work but I though I would ask.

And as far as keeping you guys posted I definitely will. As soon as I get all the bits I have ordered so I can at least put the savage back together I will post pics and weigh it so I can use the calculators that are setup on this site. This forum has been a massive help so far. I was really struggling to find any info on converting savages and the different options until I found this forum.

Edit: and as far as the CF battery mounts go I will probably go aluminium U channel. The CF is too expensive.

Etid2: To answer an earlier point to, I don't feel like destroying my savage tranny too much. I may eventually get an LST2 and move the BL setup to that and make the savage a nitro again. I think the LST2 is a better platform for a brushless setup just because the battery mounting is so much simpler. Plus it would be nice to have to monster trucks in case one breaks.

Yes

That is correct.

Good luck with the project.

The MGM is looking good. Is the bec in the MGM Compro 160 amp, 18 cell brushless car controller reliable? After reading a few threads people are still saying use a ubec as the mgm bec has blown and taken out a servo with it.

So does anyone have a design for a low cg motor mount I could steal? I don't have a motor yet to design one around and i'm kind of impatient :o. Also if I do mount the motor below the spur does any one know if I am going to have to remove my nitro motor plate and braces?

PM serum. He's got a few designs.

thanks jnev

For 5S Lipo, I might consider a 10XL.

IMO, geared appropriately, 5s on a 9XL (kv=1853) or 6s on a 10XL (kv=1668) would be ideal. Gotta remember those kv values are unloaded.

Hi Brian

Going for the 35000rpm isn't the 9xl perfect for 5s if not a bit low. It comes out at 34280 unloaded. Compared to the 10xl at 30000 rpm unloaded. I must admit though that I don't want this setup to overheat so a 10xl may be an option.

I just had a thought if I am going to run the MGM Compro 160 why not run 6s since it can handle it and stay cool. I like the idea of having 2 identical batteries too. Then I can run a 10XL or so. The compro does run cool still on 6s doesn't it.