happywing ..... man that is amazing.
your mbx5 has a 12/38 pinion/ring combo. geared with an 11/46 pinion /spur that would give you an overall ratio of 13.20-1. my raze geared at 10/46 has an overall ratio of 15.21-1.
granted everytime i tried to run a long main with my buggy the motor fan was broken from qualifing earlier in the day so i do think that if i could keep a fan on my motor i could keep going at my 10/46 combo. and when i ran an 11 tooth pinion my buggy was faster also but i dont think i could keep the motor cool enough.
honestly i am very happy with the performance and throttle feel from my 6.5 system. the only draw backs are the thermaling issue and the system is approx 4.5 oz heavier than the popular nue 1512 / mamba max combo, no fans figured for either system.
The stock Mugen ring & pinion is a 40T & 12T. So the overall ratio of a Mugen with 11/46 pinion and spur is 13.94:1
The Novak HV 6.5 motor has a 3100/kv rating and the HV 4.5 has a 4800/kv rating. I would say that in these 1/8th scale brushless buggies and heavier truggies the HV 4.5 has way too high a kv rating. The cars are too heavy and the stock diff gearing is not low enough to accomodate those numbers. Now if you used the MBX5T ring & pinion in the buggy, then you can probably gear it low enough for the 4.5.
As for gearing with the HV 6.5, most guys running the Neu 1512 1.5D (which has a very close 3200/kv rating) are using 11T pinions. But after we ran at CRCRC a few weeks ago, I believe this is still too high for these cars. I think the 9T pinion would be a better match for either system on 4S (14.8v). Since the Novak HV 6.5 has a 100/kv less rating, you might get away with the 10T pinion, but it might be pushing it for longer runs. Unfortunately getting the pinion/spur gear mesh may be an issue with these smaller pinions depending on the mount and diameter of the motor. Using the truggy ring & pinions in the buggies is a much better solution as you'll be able to run larger teeth pinions (which are smoother) and still be geared down low enough.
sorry about that tony i was going off of the parts listed on tower for referance, i guess i found the wrong ring gear.
yes the neu 1.5 and the novak 6.5 motors do have close kv ratings but the nue motor is just more powerful so it can handle the load better.
trying to compare them based on kv rating alone is loosely similar to comparing a 380 1/18 type motor to a 540 1/10 type motor that has the same kv rating, the 1/10 motor will have much more torque.
The stock Mugen ring & pinion is a 40T & 12T. So the overall ratio of a Mugen with 11/46 pinion and spur is 13.94:1
The Novak HV 6.5 motor has a 3100/kv rating and the HV 4.5 has a 4800/kv rating. I would say that in these 1/8th scale brushless buggies and heavier truggies the HV 4.5 has way too high a kv rating. The cars are too heavy and the stock diff gearing is not low enough to accomodate those numbers. Now if you used the MBX5T ring & pinion in the buggy, then you can probably gear it low enough for the 4.5.
As for gearing with the HV 6.5, most guys running the Neu 1512 1.5D (which has a very close 3200/kv rating) are using 11T pinions. But after we ran at CRCRC a few weeks ago, I believe this is still too high for these cars. I think the 9T pinion would be a better match for either system on 4S (14.8v). Since the Novak HV 6.5 has a 100/kv less rating, you might get away with the 10T pinion, but it might be pushing it for longer runs. Unfortunately getting the pinion/spur gear mesh may be an issue with these smaller pinions depending on the mount and diameter of the motor. Using the truggy ring & pinions in the buggies is a much better solution as you'll be able to run larger teeth pinions (which are smoother) and still be geared down low enough.
Best regards,
Tony, for the Neu users, would it be better for the MBX5 conversions to just go to a softer motor like the 2D or 2.5D and gear up, especially now that the new software for the MM appear to have cleared up the cogging issue?
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happywing ..... man that is amazing.
your mbx5 has a 12/38 pinion/ring combo. geared with an 11/46 pinion /spur that would give you an overall ratio of 13.20-1. my raze geared at 10/46 has an overall ratio of 15.21-1.
granted everytime i tried to run a long main with my buggy the motor fan was broken from qualifing earlier in the day so i do think that if i could keep a fan on my motor i could keep going at my 10/46 combo. and when i ran an 11 tooth pinion my buggy was faster also but i dont think i could keep the motor cool enough.
honestly i am very happy with the performance and throttle feel from my 6.5 system. the only draw backs are the thermaling issue and the system is approx 4.5 oz heavier than the popular nue 1512 / mamba max combo, no fans figured for either system.
Not that amazing. There are several reasons why I could run cool with the HV6.5:
1. Cooling - Big hole in the windshield. Fan blowing at the ESC heatsink (not mounted on the heatsink...that is why they break). Heatsinks AND a fan on the motor.
2. Weight - I had my buggy close to 7.5Lbs with 5k packs and a little over 8Lbs with 8k packs.
3. Drivetrain - Must be silky smooth. Good bearings and no binding.
4. Driving style - By nature, I don't stab the throttle often. I try to keep it smooth and keep it right-side-up.
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The stock Mugen ring & pinion is a 40T & 12T. So the overall ratio of a Mugen with 11/46 pinion and spur is 13.94:1
The Novak HV 6.5 motor has a 3100/kv rating and the HV 4.5 has a 4800/kv rating. I would say that in these 1/8th scale brushless buggies and heavier truggies the HV 4.5 has way too high a kv rating. The cars are too heavy and the stock diff gearing is not low enough to accomodate those numbers. Now if you used the MBX5T ring & pinion in the buggy, then you can probably gear it low enough for the 4.5.
As for gearing with the HV 6.5, most guys running the Neu 1512 1.5D (which has a very close 3200/kv rating) are using 11T pinions. But after we ran at CRCRC a few weeks ago, I believe this is still too high for these cars. I think the 9T pinion would be a better match for either system on 4S (14.8v). Since the Novak HV 6.5 has a 100/kv less rating, you might get away with the 10T pinion, but it might be pushing it for longer runs. Unfortunately getting the pinion/spur gear mesh may be an issue with these smaller pinions depending on the mount and diameter of the motor. Using the truggy ring & pinions in the buggies is a much better solution as you'll be able to run larger teeth pinions (which are smoother) and still be geared down low enough.
Best regards,
The guys that came in 1st and 2nd at CRCRC both had 1512 1.5D/F motors. It is really what you can do with it. I like the 1512 2D better myself. I have both.
At 15V, the 1.5D has about 2.7HP, 2D 2.5HP, 2.5D 1.5HP. The biggest thing is that it doesn't matter what you gear it, they don't overheat even without a fan.
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I got neu 1,5D in my MBX and i gear it 9/46.
I can tell it run very smooth whit updated MM.
and the temp is so lo as 131F with 14,8v.
The motor has a built-in fan and my MM has 2 fan one under and one over.
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The guys that came in 1st and 2nd at CRCRC both had 1512 1.5D/F motors. It is really what you can do with it. I like the 1512 2D better myself. I have both.
At 15V, the 1.5D has about 2.7HP, 2D 2.5HP, 2.5D 1.5HP. The biggest thing is that it doesn't matter what you gear it, they don't overheat even without a fan.
I think the the gearing is more important not so much as for temps as it is for run time and drivability. These cars will accelerate SOOOOOO much faster than a nitro car (see Stephen Bess's review of my E-MBX5R in the March 2008 issue of R/C Car) that it's very easy to be carrying too much speed going into the corner from any straight (and it does not have to be a very long straight either....LOL ). I also think that gearing will be more important on the smaller 1509 and these Novak HV motors as they make less power (watts). On the bigger 1512 and 1515 Neu motors, the power is INSANE. They probably have enough power to move a huge, heavy 1/5th Baja 5B...HAHAHA
Just so that everyone else that is reading this knows, I have only ran the 1512 1.5 D/F on 4S combo ONCE (once as in one whole 4-day weekend of racing) at the CRCRC electric race, so I don't nearly have as much experience as you guys that have been running these 1/8th scale conversions. BUT, I do know that from running 1/8th nitro for the last 4 years that more power is "usually" a bad and slower thing (slow is fast)....LOL Once I get done testing the smaller motors and other battery combos, I'll be sure to post all my findings and opinion even if I find out I was wrong in my assumptions.
BTW. Thanks Tony for going through the effort to try things out for everyone.
Getting the Novak HV systems out there just makes more opportunities for all.
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Schmutz ist für den Rennsport, asphalt ist für die Anreise
BTW. Thanks Tony for going through the effort to try things out for everyone.
Getting the Novak HV systems out there just makes more opportunities for all.
Thanks for the kind words Tom. Once you guys get to know me better you'll know that I love to play with these things more than anything....LOL
But I too am very excited that Novak is getting a system out there to use for these 1/8th conversions. I also know that Bob is very committed to all of their systems so they'll take whatever steps are needed to make it a good, working & reliable system. He wouldn't be on this forum reading and posting comments if he didn't care .
I looked at brushless conversions a while back & decided that spending $300+ on an ESC, $300+ on a motor & $100 too $200 on the coversion without talking about batteries was too much (for me). This Novak system cuts that in half as far as cost. Time to think about coversions again.
or monster max. 300 dollars for esc and a neu based motor.
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). I also think that gearing will be more important on the smaller 1509 and these Novak HV motors as they make less power (watts). On the bigger 1512 and 1515 Neu motors, the power is INSANE. They probably have enough power to move a huge, heavy 1/5th Baja 5B...HAHAHA 
Once I get done testing the smaller motors and other battery combos, I'll be sure to post all my findings and opinion even if I find out I was wrong in my assumptions. 
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