R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 11-19-2009, 11:35 AM   #1
Tech Apprentice
 
Join Date: Sep 2009
Posts: 76
Trader Rating: 1 (100%+)
Default mamba 5700kv gearing

i have a schumacher mi3.5 and i got the mamba max pro esc with the 5700kv motor. i just got this motor. i damaged my other one from setting my gearing to high. i previously had a 66t spur gear with a 41t pinion with 32 lipo 20c 5000. that destroyed my motor lol. before i had that set up i was running the same battery with the stock eighty-nine tooth spur gear and a twenty took pinion.

im a speed freak.. so im trying to get as much as i can without having to buy another motor. i set the car up with the stock spur gear but put a 30t pinion on it this time. i havent ran it yet but is this gearing safe??

i checked that rc gearing site but they didnt have any schumacher set ups with the mamba. im shooting for 60 65 mph. how can i gear to reach that safely?

im working with forty-eight pinch spurs and pinions also
bernyberns is offline   Reply With Quote
Old 11-19-2009, 02:22 PM   #2
Tech Apprentice
 
Join Date: Sep 2009
Posts: 76
Trader Rating: 1 (100%+)
Default

any help??
bernyberns is offline   Reply With Quote
Old 11-19-2009, 02:32 PM   #3
Tech Master
 
lowcel's Avatar
R/C Tech Elite Subscriber
 
Join Date: Sep 2009
Location: Charleston, WV
Posts: 1,315
Trader Rating: 80 (100%+)
Default

Do you have a temp gun? If so I would experiment and find out how far you can push it while still keeping it under 170.
__________________
Team Whopperjawed Racing
This hobby is going to $5 me to death.
lowcel is offline   Reply With Quote
Old 11-19-2009, 03:03 PM   #4
Tech Apprentice
 
Join Date: Sep 2009
Posts: 76
Trader Rating: 1 (100%+)
Default

no sir i don't.i will have to get one
bernyberns is offline   Reply With Quote
Old 11-19-2009, 03:44 PM   #5
Tech Regular
 
Join Date: Oct 2008
Location: Framingham, MA
Posts: 365
Default

I don't think you should be running more than a 22/89 or your going to melt down again. The 5700 should be run with low timing or the stock timing. It's a high rpm motor. Trying to over gear it is bad. I assume your trying to do top speed runs on the street. On a carpet track I run around 9:1 FDR (89/18) but that's a road course. I only run 2 cell roar legal lipos.
Eddie_E is offline   Reply With Quote
Old 11-19-2009, 04:00 PM   #6
Tech Addict
 
phildoggg's Avatar
 
Join Date: Feb 2009
Location: N.C.
Posts: 668
Trader Rating: 24 (100%+)
Default

Well it depends on if you are doing speed runs(2-3 passes then a break) or just wanting to run in a parking lot at high speeds. I have a tc4 setup with the 5700 geared 30/60 and on 3s lipo I have hit 80mph. with this gearing it will get hot after a couple runs. 30/89 gearing should be ok but def. keep an eye on temps.. heres a link to a good speed calculator.
http://scriptasylum.com/rc_speed/_top_speed.html
hope this helps.
phil

you need to know the diff ratio for the car and the trans should be 1 in the box. Its a great tool and pretty accurate,till wind resistance starts.
phil
phildoggg is offline   Reply With Quote
Old 11-19-2009, 07:04 PM   #7
Tech Apprentice
 
Join Date: Sep 2009
Posts: 76
Trader Rating: 1 (100%+)
Default

thanks for all the info. and phil if u was hitting eighty with 30/60 then my car must have been able to go eighty-five or 90 with my 41/66. the car was so damn fast parts would come apart man. no lie lol. the car sounded like a vaccume cleaner when i picked it up and gased it. was epic.

but i paid the price for it lol.

anyway i ran the 30 eighty-nine tonight. its nice and fast. i checked the temps every couple of minutes. i get about 10 maybe 15 minutes before i have to stop and let the motor cool down.

how in the heck do these guys on youtube get their cars so fast without buring out their motor?
bernyberns is offline   Reply With Quote
Old 11-20-2009, 04:34 AM   #8
Tech Addict
 
diozxlive's Avatar
 
Join Date: Feb 2007
Posts: 625
Trader Rating: 3 (100%+)
Default

wats the max temp for the m5700?
__________________
RC Flight/RC Grift and Drift
GP reactor, Hacker Superzomm XXL, mini funtana, mini ultrastik, bmr-2, e-hawk 1500, trex 450v2SE black, trex 450v2SE silver, Trex 500cf, trex600nsp, Thunder tiger 1/5 Ducati Desmo, revo3.3, HB cyclone ms, cyclone black, Tamiya volkswagen beetle, Mugen MBX6, X2 CRTpro
diozxlive is offline   Reply With Quote
Old 11-20-2009, 08:01 AM   #9
Tech Addict
 
phildoggg's Avatar
 
Join Date: Feb 2009
Location: N.C.
Posts: 668
Trader Rating: 24 (100%+)
Default

Quote:
Originally Posted by diozxlive View Post
wats the max temp for the m5700?
I think its between 180-200 for any brushless motor. I myself don't like it anywhere near 180.


hey bernie I bet geared like you were it was really fast.. just keep an eye on temps and have fun.
phil
phildoggg is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 12:38 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net