R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 01-30-2008, 09:51 PM   #1
Tech Rookie
 
Join Date: Jan 2007
Posts: 14
Default Associated TC3 w/ Mamba 7700 Noob Help Please

I have browsed the forum for the last couple months, and found plenty of good info. So I finally bought a TC3 FT kit. I purchased a Mamba 7700, and built a 8.4V seven cell GP3800 battery pack. I use the car on smooth parking lots mostly to race in a straight line. I have a couple issues with the car. If I go up a grade the car will take full throttle, but coming down the grade with less of a load on the motor, it acts like there is a loose connection. It spits and sputters badly. The gearing is the stock 72T spur with a 21T pinion. Should I gear the car lower? As it sits now the car on HPI 31mm and 26mm Vintage D compound tire the car spins out of control often under acceleration. I have not used the software to make any changes to the esc, I had a hobby shop setup the esc. I also noticed today after doing a burnout to heat the tires the car was only front wheel drive. It was way more controllable in this configuration but was much slower. Once I got home about a hour later, I noticed it was back to being 4wd. What would cause this?

Thanks for any help Scott
deviousz28 is offline   Reply With Quote
Old 01-30-2008, 10:34 PM   #2
Tech Addict
 
Xtant3150c's Avatar
 
Join Date: Dec 2002
Location: Kaneohe, HI
Posts: 681
Trader Rating: 10 (100%+)
Default

Sounds like a kewl setup.

It is possible that the batteries are not strong enough for the 7700kv? Going down hill it could be that the motor is able to spin faster and drawing more amps from the esc and your batteries can't keep up.

If it is running 2wd and then 4wd most likely something is broken. I would checkout the rear diff as well as the rear axles.
Xtant3150c is offline   Reply With Quote
Old 01-30-2008, 10:40 PM   #3
Tech Addict
 
Xtant3150c's Avatar
 
Join Date: Dec 2002
Location: Kaneohe, HI
Posts: 681
Trader Rating: 10 (100%+)
Default


Last edited by Xtant3150c; 01-30-2008 at 10:48 PM. Reason: double post
Xtant3150c is offline   Reply With Quote
Old 01-31-2008, 06:51 AM   #4
Tech Rookie
 
Join Date: Jan 2007
Posts: 14
Default

The batteries were fresh, and they are new. I figured 8.4v was about the best setup for the Mamba Max 7700, but it may need more? The diff started working again all on it's own, nothing apears to be broken, and no funny noises are coming from it. I don't know what doing a burnout would do to it, but that when it quit working.

Thanks Scott
deviousz28 is offline   Reply With Quote
Old 02-02-2008, 08:32 AM   #5
Tech Elite
 
nikkon's Avatar
 
Join Date: Aug 2007
Location: Cypress,TX
Posts: 2,267
Trader Rating: 249 (100%+)
Send a message via AIM to nikkon
Default

maybe the diffs are to lose,tighten them up.If they are to lose they will burn up with all the power you have going to them with the mamba.As for the electrical problem,are you running straight wire to the motor or are there plugs?
nikkon is offline   Reply With Quote
Old 02-04-2008, 04:05 PM   #6
Tech Rookie
 
Join Date: Jan 2007
Posts: 14
Default

The diff was heating up and getting loose. The other problem was a connection on the deans plug at the battery.

Thanks Scott
deviousz28 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Mamba Max 7700 dustyz R/C Items: For Sale/Trade 5 06-13-2008 08:08 AM
mamba 7700 mike_holes R/C Items: For Sale/Trade 2 06-10-2008 08:08 PM
Mamba Max + 7700 kv (NEW) Canuck R/C Items: For Sale/Trade 1 04-02-2008 11:06 AM
Mamba Max 7700 Phroz Australia For Sale/Trade 3 08-18-2007 05:21 AM
Mamba Max 7700 kit portyansky R/C Items: For Sale/Trade 2 06-15-2007 05:33 PM



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 12:34 PM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net