R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 05-13-2008, 10:50 PM   #571
Tech Elite
 
Join Date: Aug 2002
Location: Houston, Texas
Posts: 3,777
Trader Rating: 27 (100%+)
Send a message via AIM to John Stranahan
Default

If you put a powerfull mod motor in your TC5 you will want to upgrade your plastic rear diffs to Aluminum. Here are some links. The front you will upgrade to aluminum diff or a spool. The best spool is described in my previous post. I am getting great service from it.
What happens to the plastic diff is first of all it does not retain tension very well. The plastic flows away from the pressure of the screw. As soon as it slips the plastic will melt with a powerful motor. If you are using this plastic diff check that tension once in a while.


Here is the entire diff in blue aluminum
https://www.ssl-stormerhobbies.com/c...ns&pn=ASC31182

Here are the outdrives separate to use your parts to build a complete diff.

http://www3.towerhobbies.com/cgi-bin...1&P=7&I=LXRUT5

John
John Stranahan is offline   Reply With Quote
Old 05-20-2008, 09:42 AM   #572
Tech Elite
 
yyhayyim's Avatar
 
Join Date: May 2006
Location: Weston, FL
Posts: 3,424
Trader Rating: 26 (100%+)
Default

Hi John: quick question on LRP Sphere TC speedo...would you happen to know the Lipo voltage cut-off set on the Sphere TC? Some are telling the Sphere doesnt have such a thing, other are telling it does but dont know what its set at? Hopefully at least at 6v?
yyhayyim is offline   Reply With Quote
Old 05-20-2008, 01:07 PM   #573
Tech Elite
 
Join Date: Aug 2002
Location: Houston, Texas
Posts: 3,777
Trader Rating: 27 (100%+)
Send a message via AIM to John Stranahan
Default

If mode 1 is set to value 1 then the sphere comp tc edition will have a proper LiPo cutoff. The voltage is not stated, but it should be OK. Value 2 is for NiMH use. Value 1 is the default mode when the control is new.

This is from the web site.
Two adjustable settings for the Ni-MH-Li-Po adaptation:
#1: Ni-MH/Li-Po automatic adaptation
#2: Ni-MH 4-7 cell racing mode

I would just leave it in value 1 all the time except for 4 cell use.
John

Last edited by John Stranahan; 05-20-2008 at 02:09 PM.
John Stranahan is offline   Reply With Quote
Old 06-12-2008, 01:37 PM   #574
Tech Master
 
espresso1967's Avatar
 
Join Date: Mar 2008
Location: Los Angeles
Posts: 1,102
Trader Rating: 18 (100%+)
Default

Wow, I just found this thread on another forum while searching Gen x 10 stuff and brought me back to this thread. John what type of fire extinguisher would you recommend having on hand, this is scary stuff here. I know this is old news but something to keep in mind when working with lipo batteries and staying safe.

Quote:
Originally Posted by John Stranahan View Post
Another LiPo Fire

I had a batterry fire today. Makes life exiting anyway. Here is what not to do. I took an older MaxAmps LiPo which had about 50 cycles on it. At this point it was down to 2950 mA-h at the last test from a high of 4050 or so. It had been out of service for only two months, but charged every couple of weeks. They have a low self discharge rate. The battery worked the motor fine on the bench. It seemed to charge fine 2c1, then 2c2 was fine, I last inpected it at about 1250mA-h. No puffiness. Nothing unusual. Put the TC5 down just long enough to find out 3.5 degrees was too much rear toe for our track. It completely disconected the back. Got back to where the fire estinquisher was and got a notice that my battery in another car was acting up. Shortly after ward it was on fire. I grabbed the extinguisher, half way to the table the battery (probably the second cell) shot out a big aerosolized jet of vapor which immediately ignited into to quite a spectacular fireball. They said it was loud. As I was closer to the action, this time, I did not hear it. The flame was 2 foot high shot all the way to the edge of the second table that was side by side with this one so 4 feet long and caught the bag, which I thought was out of reach, on fire so maybe 2 feet wide. A couple of squirts with the fire extinguisher and it was out. No faster action could really have been taken on our part because if I was at the battery, I would then have had to run to the fire extinquisher and back. So here are the losses.

In the car- The receiver is melted, the fan on the speed control is melted, the car stand is melted. The setup board has melt damage. It was not under the car but beside it. Chassis is probably OK.
In the bag. The big Nylon bag caught fire and melted off the body of my other pan car. Melted two stopwatches and a voltmeter inside. And there is probably hidden damage. Here is a pic. I have some pics of the scene of the crime coming, I'll post one if it comed out.

Would the battery sock have prevented secondary damage. Probably most. The explosion may have been bigger though, someone did unplug the chargers. I supect the sock would have jetted out a flame quite some distance from the type of fire I saw. Aerosolized vapor already at the flash point jetted out under some good pressure.

Just a report here. Typical procedure. Chunk those weak packs.

John
__________________
www.cityofangelstshirts.com
espresso1967 is offline   Reply With Quote
Old 06-12-2008, 02:07 PM   #575
Tech Elite
 
Join Date: Aug 2002
Location: Houston, Texas
Posts: 3,777
Trader Rating: 27 (100%+)
Send a message via AIM to John Stranahan
Default

Firstly you should take the battery out of the car and charge it in a LiPo sock. This is a soft package made of NoMex fire resistant material like a racers driving suit. If the battery goes off in the sock only smoke escapes. Secondly I recommend a charger like the Scorpion Charger From FMA direct that will only charge a 2 cell LiPo. That way you cannot make a mistake with a wrong setting. I have had several of these incidents while learning what works and what does not. I feel that packs are also a bit safer now than they used to be as they are required by ROAR to be able to withstand a bit of overcharge. I have had only one incident that was not caused by user error (hooking it up backwards) or charger error (not sensing the correct number of cells in a partially charged pack). The one incident was resurrecting a pack from long term storage. I don't recommend this either.

There are plenty of incidents these days with NiMH cells exploding. This is a very high energy type of explosion with high speed projectiles usually. I have seen the result of a NiMH explosion of a tiny receiver pack in a Nitro car. It was equally devastating to the car as a LiPo fire. It broke bulkheads and burned up the fuel tank and front plastic parts. Fortunately there was no fuel on board.

Suitable extinguishers are ABC. Even a small aerosol sized can is sufficient. We are talking about a teaspoon of flamable solvent inside the pack. I put the above fire out with 2- 1 second bursts from a medium size extinguisher supplied by the track.
John

Last edited by John Stranahan; 06-12-2008 at 03:35 PM.
John Stranahan is offline   Reply With Quote
Old 06-12-2008, 02:24 PM   #576
Tech Master
 
espresso1967's Avatar
 
Join Date: Mar 2008
Location: Los Angeles
Posts: 1,102
Trader Rating: 18 (100%+)
Default

Thanks John, my lipo sack arrived 2 days ago and had no plans on charging my lipos until I got this protection. I will pick up a small extinguishers to have right by my side at track side.
__________________
www.cityofangelstshirts.com
espresso1967 is offline   Reply With Quote
Old 08-11-2008, 03:12 AM   #577
Tech Adept
 
KING COOPA's Avatar
 
Join Date: Jan 2007
Location: mesa
Posts: 153
Default

Do tamiya springs fit on the associated shocks?
KING COOPA is offline   Reply With Quote
Old 08-11-2008, 10:20 AM   #578
Tech Elite
 
Join Date: Aug 2002
Location: Houston, Texas
Posts: 3,777
Trader Rating: 27 (100%+)
Send a message via AIM to John Stranahan
Default

The Associated springs are .515 inch ID. A spring with this inner diameter or a little bigger should fit. I don't have a tamiya spring to test this. Anyone?
John
John Stranahan is offline   Reply With Quote
Old 08-11-2008, 01:32 PM   #579
Tech Elite
 
LOW ET's Avatar
 
Join Date: Dec 2007
Location: cleveland, ohio
Posts: 2,881
Trader Rating: 97 (100%+)
Default

Quote:
Originally Posted by espresso1967 View Post
Thanks John, my lipo sack arrived 2 days ago and had no plans on charging my lipos until I got this protection. I will pick up a small extinguishers to have right by my side at track side.
make sure you get one for lithium fires or you may create more problems then you think.
LOW ET is offline   Reply With Quote
Old 08-11-2008, 05:12 PM   #580
Tech Elite
 
Join Date: Aug 2002
Location: Houston, Texas
Posts: 3,777
Trader Rating: 27 (100%+)
Send a message via AIM to John Stranahan
Default

The fire is not really a Lithium fire. There is a small amount of solvent as the electrolyte. This solvent (like a gasonline fire) is what burns along with the plastic in the separators. A small ABC extinguisher is sufficient to kill the fire as the amount of solvent is low. The track should have a couple of 5 lb extinguishers present. Fire is also a problem with NiMH explosions in the car. I saw one Nitro car completely burned up in the front as the receiver pack, blew, then shorted, then ignited. Fortunately there was no fuel on board. Just use a sock for LiPo.
John
John Stranahan is offline   Reply With Quote
Old 08-14-2008, 08:01 PM   #581
Tech Elite
 
Join Date: Aug 2002
Location: Houston, Texas
Posts: 3,777
Trader Rating: 27 (100%+)
Send a message via AIM to John Stranahan
Default Non Sequitur

I made a post to the wrong thread. It is here now.
Attached Thumbnails
Associated Factory Team TC5, Brushless, LiPo, Li-ion Nanophosphate, Tips and Tricks-assembly-near-completion-002.jpg   Associated Factory Team TC5, Brushless, LiPo, Li-ion Nanophosphate, Tips and Tricks-motegi-wheel-001-resized.jpg  

Last edited by John Stranahan; 08-14-2008 at 10:13 PM.
John Stranahan is offline   Reply With Quote
Old 08-31-2008, 12:38 PM   #582
Tech Initiate
 
Turbokisa's Avatar
 
Join Date: Feb 2007
Location: Russia, St. Petersburg
Posts: 39
Default

Quote:
Originally Posted by ooliganRC View Post
Hi guys,

tell please what is the part number of that grey rod ends?

Thanks.
Turbokisa is offline   Reply With Quote
Old 08-31-2008, 03:05 PM   #583
Tech Master
 
Join Date: Mar 2002
Location: upstate New York
Posts: 1,364
Trader Rating: 21 (100%+)
Default

They look like the Schumacher "Ball Grippas".Don't have a part number..Should be listed on the Schumacher website.Mario
lotus1 is offline   Reply With Quote
Old 08-31-2008, 03:26 PM   #584
Tech Elite
 
LOW ET's Avatar
 
Join Date: Dec 2007
Location: cleveland, ohio
Posts: 2,881
Trader Rating: 97 (100%+)
Default

Quote:
Originally Posted by John Stranahan View Post
Here are some dimensions
Spring relaxed length 27 mm
Shock fully extended end to end 60 mm
There is a maximum diameter tire that are legar for TC use. I'll check.
Maximum tire diameter 67mm


here is a pic of the rears correctly assembled to the shock tower.
when using the correct short ballcups my shocks are roughly 62mm end to end.
LOW ET is offline   Reply With Quote
Old 08-31-2008, 03:37 PM   #585
Tech Fanatic
 
Hide's Avatar
 
Join Date: Sep 2007
Location: London
Posts: 931
Trader Rating: 8 (100%+)
Default

John,

When running the LRP Sphere TC Comp, 27t Brushed motor and a SMC 5000 30C Lipo what runtimes should I be expecting? I am running Foam on Carpet (pretty short track). Im asking because I have no idea and you will probably know.

I havent tuned the TC5 at all yet so its completely stock. Can you recommend anything I can do to make it any better?

Thanks, Jacob.
__________________
Losi 8ight-E 2.0, LRP Shark, Xray M18T custom extended, Traxxas VXL Revo
Hide is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Pantoura, 1/10 Pan Car, 2S LiPo, Brushless, Tips and Tricks. John Stranahan Electric On-Road 2178 12-01-2010 11:26 AM
BRUSHLESS rc18t factory team with lipo dub599 R/C Items: For Sale/Trade 11 06-16-2008 12:14 AM
Factory team B4 Novak brushless with lipo PTP Racing R/C Items: For Sale/Trade 1 12-13-2007 11:36 PM
Factory Team RC18T with hopups and brushless / lipo setup! Cain R/C Items: For Sale/Trade 5 11-26-2007 05:35 PM
Xray T2R, 2100 mah 2c LiPo, and Mabuchi power: Tech tips and Tricks gacjr0 Electric On-Road 46 11-18-2007 10:09 AM



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 02:27 PM.


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