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-   -   Project Super-VBS-CF-Gorillamaxx!!! (https://www.rc-monster.com/forum/showthread.php?t=9731)

jordan... 11.24.2008 10:08 AM
Yep, thanks again for your help, seems to be all good now, except these temps. I'm going to solder the motor wires to the ESC tomorrow to eliminate the connections as the problem, i really dont want to have to cut another motor mount :eyes: Any tips to doing this? Do i just hold the wires together and solder them or should i wrap them together somehow?

What timing and PWM frequency settings do you run? at the moment my motor timing is set to auto and have the 8kHz frequency set. As for the fans, when i do run with the body, the ESC only clears by milimeters, so fans would have made mounting even harder.

Good to hear about the batteries, it was the first full charge i had put through them, so ill try get a couple more this week and see if them come to life

lutach 11.24.2008 10:15 AM
Your truggy is supposed to be fast. Is anything binding on the drive train? My BPP with the 1521/1Y had an issue like this and it was my fault as I forgot to shim the diff. The ESC (Schulze 40.160) got hot which is kind of unheard of. As for the fan, you can mount your ESC so the heat sink is not facing down and that way it'll allow you to mount the fans.

suicideneil 11.24.2008 07:44 PM
I have a question- what pinion are you running with the 42t? spur gear- I think I saw an 11t item back along?

Running the numbers through the calculator, it says:

Quote:
Differential Ratio: 3.3076923076923075
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 42
Pinion Tooth Count: 11
Total Voltage: 18.5
Motor KV: 2300
Tire Diameter (inches): 5.8
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0.002
Spur/Pinion Ratio: 3.82 : 1
Total Ratio: 12.62937 : 1
Tire Circumference (inches): 18.22 inches (462.82 mm)
Total Motor Speed: 42550 RPM
Vehicle Speed: 58.13 mph (93.38 km/h)
Estimated Adjusted Speed: 54 mph (86 km/h) - 8% loss
Effective KV Value: 2300
KT constant: 0.59 oz-in/A
Something isnt right. At a guess I would say either some esc setting sneed severe tweakage, or the motor is just too huge and cant spool up or something. Do you have a smaller 1515 or XL sized motor you can try with 1600-2300kv?

lutach 11.24.2008 07:48 PM
Quote:
Originally Posted by suicideneil (Post 235686)
Something isnt right. At a guess I would say either some esc setting sneed severe tweakage, or the motor is just too huge and cant spool up or something. Do you have a smaller 1515 or XL sized motor you can try with 1600-2300kv?
His truck should've been flying. Do you have the timing set right? Do you have the ESC set for race mode (I think that's one of the setting, it's been a while lol)?

jordan... 11.24.2008 08:59 PM
Quote:
Your truggy is supposed to be fast. Is anything binding on the drive train? My BPP with the 1521/1Y had an issue like this and it was my fault as I forgot to shim the diff. The ESC (Schulze 40.160) got hot which is kind of unheard of. As for the fan, you can mount your ESC so the heat sink is not facing down and that way it'll allow you to mount the fans.
I'll check for binding, but all the diffs and things were shimmed pretty well before i started. I'll check again though, it should just roll freely when i push it along right?

Quote:
I have a question- what pinion are you running with the 42t? spur gear- I think I saw an 11t item back along?
I'm running a 16t pinion, on the calculator has an adjusted speed of 75mph. Unfortunately this is the only BL motor i have, im going to bring the laptop out with me today hopefully (if the weather stays good) and tweak some things and see how that affects the performance.

Quote:
Do you have the timing set right? Do you have the ESC set for race mode (I think that's one of the setting, it's been a while lol)?
For the timing setting, i've just got it on auto. Im not to sure what the 10*, 20* etc. would do so i just left it for the first run. What timing do you guys normally run? There is an option for race mode, but that means you cannot use the LVC feature, so i didnt want to risk my lipos. I'll check the timing and frequency and things like that today.

I was thinkning last night, cool motor and hot ESC = overgeared right? But if it is normal motor and hot ESC, does that mean the problem lies somewhere else? Im going to solder the ESC and motor together today to get rid of some dodgy connections i have there and see how that goes.

cheers for the help guys, i'll keep you posted on the testing.
jordan

lutach 11.24.2008 09:12 PM
Quote:
Originally Posted by jordan... (Post 235732)
I'll check for binding, but all the diffs and things were shimmed pretty well before i started. I'll check again though, it should just roll freely when i push it along right?



I'm running a 16t pinion, on the calculator has an adjusted speed of 75mph. Unfortunately this is the only BL motor i have, im going to bring the laptop out with me today hopefully (if the weather stays good) and tweak some things and see how that affects the performance.



For the timing setting, i've just got it on auto. Im not to sure what the 10*, 20* etc. would do so i just left it for the first run. What timing do you guys normally run? There is an option for race mode, but that means you cannot use the LVC feature, so i didnt want to risk my lipos. I'll check the timing and frequency and things like that today.

I was thinkning last night, cool motor and hot ESC = overgeared right? But if it is normal motor and hot ESC, does that mean the problem lies somewhere else? Im going to solder the ESC and motor together today to get rid of some dodgy connections i have there and see how that goes.

cheers for the help guys, i'll keep you posted on the testing.
jordan
That is definatley not the right gearing to be running on grass and you definetaly 100% sure overloaded the ESC. That type of gearing is supposed to be used for speed runs on asphalt. Change your gearing. I use a 17T pinion in my BPP mainly because it has a huge 65T spur and I'm geared for 34mph, but with tire ballooning it went 46mph radar confirmed. This is why I asked you if you had any plans on making a single motor mount so you could adjust to make a smaller pinion fit.

jordan... 11.24.2008 09:29 PM
Ahh i see, I'm thinking about how to make one, hopefully i can find a friend who has access to a CNC machine :whistle: Even with overloading the ESC, shouldn't it still have been fast? Im going to try and tweak some things here and there. How does the motor timing work? I have it auto at the moment but im not sure what changes will do?

lutach 11.24.2008 09:34 PM
Quote:
Originally Posted by jordan... (Post 235738)
Ahh i see, I'm thinking about how to make one, hopefully i can find a friend who has access to a CNC machine :whistle: Even with overloading the ESC, shouldn't it still have been fast? Im going to try and tweak some things here and there. How does the motor timing work? I have it auto at the moment but im not sure what changes will do?
Not on grass. You're luccky none of the FETs blew due to the high stress you put on them. You have to find a way to use at least a 51T spur with a 11T pinion to run on 5S or you have to use 3S lipos. Auto timing is fine or 0 degrees as you have the D wound Neu motors. One thing good about the MGM is that the ESC slows down when too much load is put on the ESC. So you were probably running on less then 50% power.

jordan... 11.24.2008 09:40 PM
Ahh ok, lucky then, ill look into another motor mount. Good to know theres still some speed left in it

lutach 11.24.2008 09:41 PM
Quote:
Originally Posted by jordan... (Post 235741)
Ahh ok, lucky then, ill look into another motor mount. Good to know theres still some speed left in it
You should've been flying, but on grass your ESC just went into reduced power mode.

BL_RV0 11.24.2008 09:49 PM
Starting to make sense... :lol:

jordan... 11.24.2008 10:00 PM
Quote:
Originally Posted by lutach (Post 235742)
You should've been flying, but on grass your ESC just went into reduced power mode.
It did slow down even more just before i decided to stop, i thoguht it might have been the batteries, but it must have been the ESC. Starting to make sense... :lol: .........:rofl:

BL_RV0 11.24.2008 10:07 PM
:na:

jordan... 11.24.2008 11:24 PM
not good...
 
I just pulled the motor and esc off the truck and found i have melted the bottom heatshrink on the ESC, can i just unscrew the heatsinks and re shrink wrap it?

http://i212.photobucket.com/albums/c...x/DSC00107.jpg

http://i212.photobucket.com/albums/c...x/DSC00108.jpg

http://i212.photobucket.com/albums/c...x/DSC00109.jpg

Also, when i pulled the heatshrink off of the gold connectors, i found one of the motor wires had become detached and was only being held in place by the heatshrink. Looks pretty toasty in the connector. Could this have caused the overheating, or is it definately the gearing?

http://i212.photobucket.com/albums/c...x/DSC00106.jpg

any help would be good, i think this is definately operator error though :oops:

BL_RV0 11.24.2008 11:50 PM
Which solder did you use for the bullets? You can just re-shrink the MGM. Make sure to hold the lighter as far away as possible so you don't fry the internals. Why not retrofit your motormount to be adjustable? Why would you (in your right mind) gear so high?


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