Brushless hpi baja rc-monster

Here's what the monster had to say....
I have only done limited running so far - had to keep it looking nice for the RCX show. Let me answer some questions that popped up:

is the rear of the motor supported - no it is not. The motor mount is just under 8mm thick(.3") and mounted to a 9.5mm (.375")lower plate on the chassis. the top of the motor mount is also attached on both sides to act as a chassis brace - supporting the rear of the motor simply isn't necessary. The mount is already supported on 3 sides.

Performance? - Using 8s 6000mah packs, it is quite nice. The HV180 controller works surprisingly well and is quite smooth. Quick stabs at the throttle yield quick wheelspin and sideways motion - until the tires get warm. Then it rips the front wheels off the ground. The speed with 8s and the 16t pinion calculates to low-mid 50mph range and should yield 10-20 minutes of runtime(depending on how and where you drive it). With rear only brakes, it is borderline too fast just like this. The installed setup will accept 10s lipo no sweat(limited to 42 volts by the BEC installed, though the esc can accept up to 12s). With the same setup, 10s calculates to 65+mph. This is retarded with rear only brakes. Even the existing setup will "smoke' the brakes after a few hard stops(I know, I thought i cooked the ESC, but it was the brakes that were actually smoking!).
The motor mount will accept a pretty good range of pinions, so with a healthy 12s(different BEC) pack, a giant set of gonads, and some serious space, the truck could probably make 100 mph. The truck itself (and balls of the user) will be the limit, Along with the available real estate.
I also intend to offer different/replaceable motor mount plates to accomodate other motors. The rest of the kit can remain unchanged. I am working on pinions as well. the 16t is the only one i have at the moment, aside from some molded delrin gears(that i will of course try as well). Everything you see is "bolt on" - no modifications to the chassis at all. It took some time to get it all neat and clean like you see it, but it is worth it IMO.

IMO, the car is damn near perfect with the existing setup. Sure, i will try 10s for the sake of science(and different gearing), but it responds, reacts and drives like a 1/10 2wd buggy running a mod motor in its current form - Big thanks to Masterblaster for sending this project my way. I traded my baja away years ago, but this project makes me want to get another one - it is simply awesome!

[Unsullied_Spy]

I was wondering about the rear of the motor being supported because that's a lot of weight hanging off those 2 little screws. I'm sure the mount itself is strong, but I don't want to break off screws inside my motor coming down from a hard landing. This would be more of a problem for me because I plan to use a 1527 (longer) but I wouldn't want a motor as heavy as the 2215 supported by 2 little screws unless they were at least a grade 12.

I will look into getting a super High grade of steel screws for that, thanks for the cool idea.

[squeeforever]

Those look like M4 screws, so I don't think I would worry about it to much.

[PBO]

After seeing a certain firms version of a brushless Baja, I tuned out to the idea...but I'm inspired after seeing this one!

It looks incredible...well done. Is anyone brave enough to put a dollar value on it?

[MTBikerTim]

That looks awesome. What does it weigh with packs? It looks like it would be super light.

I couldn't convert my baja though. It works so well as it is. I didn't even like the baja that much until I got one. The little 2 stroke goes and goes. I have tried to kill it trust me but it just keeps going. It's by far the most reliable rc I have.

[Unsullied_Spy]

IIRC he said on HBF that it's 22 pounds.

I wish my Baja would run that well. Mine has been nothing but trouble for the half gallon I've put through it and now people are telling me it has a bad ring. I'm pretty pissed at it, when you make as little money as I do $1,000 for a toy that doesn't run is a major kick in the stomach.

[lincpimp]

Originally Posted by Unsullied_Spy

I was wondering about the rear of the motor being supported because that's a lot of weight hanging off those 2 little screws. I'm sure the mount itself is strong, but I don't want to break off screws inside my motor coming down from a hard landing. This would be more of a problem for me because I plan to use a 1527 (longer) but I wouldn't want a motor as heavy as the 2215 supported by 2 little screws unless they were at least a grade 12.

If you plan to use a 1527 I would go with a clamp style motor mount. I will run a pair of 1521 2y motors in mine, and just need to getthe critical measurements to the laser cutter. My motors will be stacked, so I needed a solid way to mount the motors in the same plane. Pinion selection is the worst part right now, I found some 12t pinions that are way too long, and still have to be drilled and tapped for set screws. The only benefit to the addl length is that I can adjust where the motors sit so that I can clear the front of the tranny case. I will hopefully have more work done on this project next week...

[brushlessboy16]

a single 1527 isnt enough?

With that long of a motor your will definately need some sort of rear support, what did you have in mind?

[SV6000]

fastelectric.com sells motor mounts for the 2200 and 1500 series motors that support the front and rear of the motor. You could use one of them but you may have to drill into the bottom chassis plate

[hootie7159]

or maybe with the flux capacitor...he'll go back in time and run over "fine designs" brushless baja conversion so that the baja brushless family will NEVER have to deal with shame like that again... LOL

[lincpimp]

Originally Posted by brushlessboy16

a single 1527 isnt enough?

With that long of a motor your will definately need some sort of rear support, what did you have in mind?

Something like the flux motor mount would work great, and it fits smooth can 15 series neus perfectly. I have some of the boat style clamps and they are not as sturdy as the flux clamps. Plus I think the flux clamps are cheaper...

Originally Posted by SV6000

fastelectric.com sells motor mounts for the 2200 and 1500 series motors that support the front and rear of the motor. You could use one of them but you may have to drill into the bottom chassis plate

I bought the 15 series mounts, but they are a bit cheapy... Still a good idea, they just need to be more solid.

[brushlessboy16]

but do you really need dual 1527s?

The 1527 is one hell of a motor, and with a low kv and some decent voltage it should be good(?)

[lincpimp]

Originally Posted by brushlessboy16

but do you really need dual 1527s?

The 1527 is one hell of a motor, and with a low kv and some decent voltage it should be good(?)

Time for some Glasses Ben... I am running a pair of 1521 motors... I have a 1727 2y, but that will be run in the stretched savage (not the little one I am doing, the baja 5t size one that is under wraps). I plan to run that on 10-12s lipo with a lutach esc (by the time I get finished with the build he should have something appropriate).

My reasoning is that I have the 1521 motors, and paid less than 100 bucks for them () and they will put out about the same power as a 2215 motor. I also have 10s worth of 4500 30c lipos, (actually have 14s but no esc to run that) and with 12t pinions the baja will do around 50mph. 2 turnigy hv escs cost me 250, and that is it for equipment. The motor mount will run 50-60 bucks to make, and the side and bottom braces can be done by me. Won't be a spiffy as Mike's stuff, but I like making my own things, and I doubt it would be worth his time to make a twin 15 series mount for a baja.

[brushlessboy16]

ohh . how do you think a single 1527 would do?