BL MBX-5 Near completion. Pics

[BrianG]

How'd I miss this thread?! Looks very clean and well done. The sandblasted Al is a nice (and different) touch. Before I read it was made of Al, it looked like some type of gray dense plastic. :)

[zeropointbug]

nice setup!

BTW, is that motor mount sand-blasted? Looks nice, and won't scratch at least

[SilentMonster]

Originally Posted by lxmuff

What settings do you use on your MM? Where do you live in MI?

I'm on the road right now but I'll check for sure when I get home. I can get it to roll real slow with just a touch of throttle but if I try to roll into the throttle gradually it will cog real bad and won't go so I have to hit the throttle hard after getting it to roll slowly. It will still cog but only in that one spot. I really don't like the cogging but I will play around with the settings some more to see if I can get it better. I do know I am running 100 percent punch control, lowest timing, 12V cutoff and linear throttle curve. I'm not sure what is going on with the cutoff though. I only got 6AH out of the battery and it shut down under hard acceleration. It must be pulling the volts down under 6V per cell. It takes right back off though with in a second or so.
I live in Hillsdale. My nephew raced the ROAR national up in Westland at CEFX the same weekend of your last race. We headed that way to check it out on Sat. night but due to some other problems we didn't make it. I saw a couple of months ago you had 7 or 8 that were running up there. We race at Stateline raceway in Fremont, IN. We may have to come up sometime to a race. It would be nice to hang with like minded converted:005: people. I am the only one that had a brushless MT at our track last year and now I'm gonna have the buggy. There are mixed feelings from the Nitro guys that I race against:007: .
Ya the beadblasted Al was my BIL's idea.

[SilentMonster]

Originally Posted by lxmuff

.I’m almost done with my new 8ight with a 1512 1.5D Neu and I’ll be using the MM.

You really are using that motor? What volts are you running? There is nothing wrong with running that motor on 4 or 5 cells. It can handle it. It will be faster than all get out. It just seems the general consensus around here is to use a much lower kv motor ie. around 2000kv. Now I've gotta come to a race just to check it:027: out. I was planning on using the 1515/1Y or the 1512 2.5D.

[yj-7]

So hows the buggy running? Have you done any speed runs with it?

[SilentMonster]

If I had to guess I'd bet it is running right around 33MPH which is too slow for our track. I'm still deciding on whether to run the 1512 or 1515. One day I read something and I am sure I will order the 1512 and then I read something else and I'm not sure. I'm just worried that the 1512 won't give me the power/speed I need. Maybe I am all wet but it's hard to make a decision when I have not seen one run. Our track is pretty big and has some high speed sections. OH and to answer the question, I did a speed run with my nephews XLT-4 motor. It was geared 24/44 and the thing was a screamer. We paced it with a 1:1 car and it did all of 55MPH. It would get real toasty though with only a couple of minutes run time. LOL

Stephen.

[jhautz]

The 1512 in a buggy will be all the power you need. I have the 1512/2.5D and have run in my 1/8 buggy, revo, maxx and XLB 1/7. More power than the XL motors IMO. Its plenty of power for a track. You have no worries there. I would say its a btter chioce than the 1515, just cuz of the weight factor. How much does that setup weigh with the 8K mah lipo?

I'm wondering how your lipo is holding up with that battery mount. It looks really well done. One thing I have found is keeping as much surface contact as possible on a lipo is important. I had a similar setup for a little while where I was contacting only around the bottom edge and 1 smaller point on the top and all it took was 1 crash and I wound up with some significant dents in the lipo. Freaked me out and I discarded that mount an built something that touched the lipo over a larger surface area and also added some foam padding to the contact points.

[SilentMonster]

OK, jhautz You pushed me over the edge. I solemnly swear to order the 1512. Now do I get the 1900kv or the 2000kv? I wonder why they make such seemingly similar motors? I can't fine it on Nue's site but on DMA's site they rate the 1512/1.5Y 90+ efficiency and the 1512/2.5D at 86+. I'm leaning towards the 1512/1.5Y just because of that. Any reason not to go with that one? Anybody know the differences?
It weighs 8lbs 7oz RTR with Transponder.
The battery mount is working fine. I first ran it directly on the bare chassis but it was getting small pieces of gravel under the battery and leaving small dimples. I have since padded the whole bottom and sides with that thin craft foam and not a single issue. It fits nice and snug. I have ran it very hard with many high flat landed jumps, coming up short jumps and you name it.
You wanna know the funny thing? This is my first 1/8 buggy and I never even ran a nitro motor on it. I am impressed with the durability of these things. I'm used to the XX-4. You sneeze on one of those and it's broke. Don't get me wrong, I love my Losi but compared to the 1/8 stuff it is "HANDLE WITH CARE".
Stephen.

[BrianG]

Yes, the 1512 is WAYYY more than enough for the track! I was running my 2d on 4s at the local track yesterday trying out a hardened 16T pinion and it went so fast so quickly that the front end hit a bump and it went airborne into the wall. Awaiting new shock tower now.

The efficiency is not a hard number. It will change based on current flow and load. The Neus in general are very efficient and stay cool. You basically choose the KV for the voltage you are going to use to stay under the 40k rpm "sweet spot". You need power to move any vehicle. 14.8v (4s) at 100A has the same power as 22.2v (6s) at 66.6A. Running a higher voltage lets you choose a lower kv motor to get the same speed and power output. And since current is less, efficiency will be higher. And less current is good for everything; batteries, wires, connectors, ESC, etc...

[zeropointbug]

Well said Brian.

What size is the 1512 Neu's anyways?

Next year I'm thinking of going Neu.

[yj-7]

Originally Posted by BrianG

Yes, the 1512 is WAYYY more than enough for the track! I was running my 2d on 4s at the local track yesterday trying out a hardened 16T pinion and it went so fast so quickly that the front end hit a bump and it went airborne into the wall. Awaiting new shock tower now.

The efficiency is not a hard number. It will change based on current flow and load. The Neus in general are very efficient and stay cool. You basically choose the KV for the voltage you are going to use to stay under the 40k rpm "sweet spot". You need power to move any vehicle. 14.8v (4s) at 100A has the same power as 22.2v (6s) at 66.6A. Running a higher voltage lets you choose a higher kv motor to get the same speed and power output. And since current is less, efficiency will be higher. And less current is good for everything; batteries, wires, connectors, ESC, etc...

So running a higher voltage lets you choose a higher kv motor to get the same speed and power output? I'm not sure I understand that. It seems to me like you should run a lower KV for higher volts. Now I'm really confused:032:

[BrianG]

Oops. :) I meant lower kv motor lets you choose a higher voltage. I was thinking "turns" but wrote "kv". I'll fix the original response. My bad!

[zeropointbug]

Geez Brian, you're doing more harm than good here! :005:

In reality, higher voltage will allow you to get a higher power from a given motor, that being said staying within a given RPM limit; I'm talking about scaling the system voltage ALONG with the motor KV (lower). This is because torque output goes up, efficiency goes up as well, that's if you stay within a couple 1k rpm, do you get what im saying? :032:

[BrianG]

I know, I know. Bad Brian! A mod will have to suspend my posting priveledges.

[SilentMonster]

Brian, what kind of temps is your 1512/2D motor running on a long hard run with 16/44 or similar? Thanks.