Project Super-VBS-CF-Gorillamaxx!!!

[suicideneil]

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:

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]

Originally Posted by suicideneil

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...]

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?

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.

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]

Originally Posted by jordan...

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...]

Ahh i see, I'm thinking about how to make one, hopefully i can find a friend who has access to a CNC machine 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?

[SV6000]

Hey Jordan the center diff in my G3R is a 48t Kyosho item. it fits perfectly.

[jordan...]

Hey Jordan the center diff in my G3R is a 48t Kyosho item. it fits perfectly.

hmm.. ok, ill grab one of them, what pinion size are you using? Oh, and do you have any pics of your setup? Would like to see how your CD setup is layed out.

46/12 is too high...

I hope you're joking and another thing, when taking the heatsinks off of the MGM, is there some kind of paste under them that i would have to put back on when i re-attach the heatsinks? It looks as if there is some kind of glue or something under there, im assuming it just helps with the heat transfer?

[JERRY2KONE]

Yes Jordan it is thermal paste used in most PC applications for putting a heatsink on the processor. You can get it at most PC stores, or order it on line at TigerDirect.com.

[SV6000]

Hey Jordan there is a picture here is a picture of my setup, i got i second hand off a guy on the traxxas forum, but it is the same as i have now. The only difference is that i am running a NEU 1515 1Y/F instead of the Lehner and i mounted my speedy on top of everything with an aluminium plate, sort of like what you did. I will post photos of my exact setup next week when i get back from work http://monster.traxxas.com/showthread.php?t=434613

[jordan...]

Are you serious I only saw the black and blue E-revo that guy made, not the G3R, thats freakin awesome. Can't wait to see some pics. Do you work up north at the mines or something?

BTW, i e-mailed Martin at MGM about replacing the heatshrink, how long does he normally take to reply?

[SV6000]

Yeah i work up north on the mines but i only do one week at a time. Martin is really quick to respond or someone else will, i got a response on sunday and monday just gone for an issue i was having with the BB-O3. By the way i was waiting to see how your motor was going to perform, i was thinking about getting one. I have a CF and AL version of the G3R. I could extend the AL version and put a 1527 in that. SO LET ME KNOW WHEN THE THING IS SORTED and i will meet with you to see how it goes first hand. I will be back in town next wednesday hopefully we will be able to meet up than.

[jordan...]

I just got a reply from Martin, awesome service, he said if i send it back to get it fixed up i wont void my warrenty and it should only take 2 days to fix. So i might do that tomorrow. I'm putting my order in for the gears tonight, so they should be here within 5 days. Im not sure if ill have the MGM back by next week, but i will have an MMM V3, so i might try that out. Hopefully it will be sorted ASAP, looking forward to running with your G3R. BTW, what do you do up there, ive got a couple of mates who are diesel mechanics, one's in Port Headland and the other is a couple hundred kms out of Karratha, i bet its fun on those 45*C+ days .

[SV6000]

Diesel mechanic, yeah 45*C+ days are great especially when you have to wear long pants and shirts. but it beats being burnt by trubos and other things of the like

[SV6000]

Mate i would do the math on the V3. It is only rated for 120A, and considering your motor will pull 200+ amps on 6s i would hate to see you sending two speedies off for repair in the same week. Yeah hopefully you will get your speedy back from MGM soon. Not to rain on your parade but when i ordered mine from them it took 3 weeks to get to me. so your probably looking at about 8 week turn around

[jordan...]

Lol, hmmm... one guy on here a earlier this year ran one of these on an MMM V1 on 6s and said it pulled up ok But i really do not want to be sending another one back Im expressing to and from MGM, so hopefully it won't take the 8 weeks

P.S what is the best way to solder the motor wires directly to the ESC, just hold them together, get them hot, and make a big ball of solder around them?