Go Back   XmodSource.com > Xmods > XMOD Electronics
Register FAQ Members List Calendar Gallery iTrader Search Today's Posts Mark Forums Read

Closed Thread
 
Thread Tools Display Modes
  #1  
Old 04-01-2007, 02:45 PM
jimmythekid1's Avatar
jimmythekid1 jimmythekid1 is offline
MEOWWWWWWWWWWWWWWWWWWWWWW
 
Join Date: Feb 2005
Location: Michigan
Posts: 468
Trader Rating: (0)
Default My burnt FETS story or rant as it maybe

I have often heard don't need a fet upgrade for liths, but personally I think a FET upgrade is good insurance. I can't speak for evos since I've never had one, but gen 1 FETS can handle a consistent 2 amps before you run into problems. A normal rwd xmod with stock power supply rarely reaches 1 amp under normal driving conditions. But using some tools or toys I have I've tested to find that a stock xmod can peak over 2 amps for a short time with no problems, the tools I used were a low amps probe and an oscilloscope.

OK lets us an extreme case, ok you have just installed an awd kit, something is out of alignment, causing binding and the car barley moves, then you get stuck on a fly turd and the car won't move. Did I let the throttle go? No I hold it down and try to get unstuck, i do this for a long time, and what do you know my motor is **** hot. So I finally give up and go ahead and fix my awd issue and the **** car still won't move, after further inspection I realized I overheated and burnt my FETS.... So what happened?

All they binding overloaded the motor, the harder it had to try to move the more current it drew, causing it to burn FETS with stock power supply. That is a true story, it happened to me.

Now lets us ohms law

voltage divided by resistance equals amps
6volt/6.66ohms=.9 amps normal running motor RS S2

8.4volts/6.66ohms=1.26 amps running normal RS S2
with liths running normal we are just .74 amps away from possibly doing damage, now if something binds or we get stuck it is much easier to burn FETS.

That is why I always recommend a FET upgrade or V2 with a power supply upgrade.
It may not be 100% necessary but it is good insurance, and good time to modify your board is when you’re adding liths. Also when you get board of liths and a stock motor you will already be set up for a hot motor.

Thanks for taking the time to read this,
Jimmythekid1
__________________
flickr
  #2  
Old 05-15-2007, 04:18 PM
sicSCION's Avatar
sicSCION sicSCION is offline
New Member
 
Join Date: May 2007
Location: lenoir city
Posts: 4
Trader Rating: (0)
Default

i ran my car in stock form and added a 7.4 li-po pack in addition to my 4 aaa
result: blown
  #3  
Old 05-15-2007, 04:25 PM
noturday's Avatar
noturday noturday is offline
[Not-your-day] - Badass
 
Join Date: Apr 2007
Location: Spring, Texas
Posts: 839
Trader Rating: (5)
Send a message via AIM to noturday
Default

haha the liths are supposed to replace the 4 aaas not combine with it, and if i do liths im gonna upgrade and stack my fets b4 i even turn it on
__________________

Team XI
  #4  
Old 05-16-2007, 12:22 AM
sicSCION's Avatar
sicSCION sicSCION is offline
New Member
 
Join Date: May 2007
Location: lenoir city
Posts: 4
Trader Rating: (0)
Default

i thought it was pretty funny .car ran sooooo fast i wish i had a speed checker on hand to see exactly what it was pulling
  #5  
Old 05-16-2007, 12:37 AM
noturday's Avatar
noturday noturday is offline
[Not-your-day] - Badass
 
Join Date: Apr 2007
Location: Spring, Texas
Posts: 839
Trader Rating: (5)
Send a message via AIM to noturday
Default

yeah i hooked up a 9v to a gen 1 car and it flew for about 30 sec till it blew the board
__________________

Team XI
  #6  
Old 05-16-2007, 07:18 AM
mustanglover's Avatar
mustanglover mustanglover is offline
US Air Force
 
Join Date: Jan 2007
Location: FL
Posts: 1,547
Trader Rating: (9)
Default

i had alot of blew fets from a 6TH CELL!
  #7  
Old 05-16-2007, 11:44 AM
xmodsnut xmodsnut is offline
Banned
 
Join Date: May 2007
Location: Millersburg, ohio
Posts: 991
Trader Rating: (20)
Default

man I think I trashed one of my 05 stangs running only 4 1.2 volt 850mah energizers it has every upgrade imagineable on it but left the batteries at four. I noticed that after three runs of 20 laps on my xmods track, I had to recharge in between runs, my s2 motor and terminals were hot. it runs good but wont steer at the same time as I drive it and stops every few seconds now and if I hit the wall.
  #8  
Old 06-10-2007, 11:05 PM
meme405 meme405 is offline
Xmod Expert
 
Join Date: Apr 2007
Posts: 1,004
Trader Rating: (0)
Default

...dont stack fets get a V2.2 board or a nelly upgrade trust me their 5 times better...i've had one of each...especially if you plan on doing it yourself...its a hard *** upgrade
  #9  
Old 07-11-2008, 07:15 PM
aaronz350z's Avatar
aaronz350z aaronz350z is offline
Stage 2 member
 
Join Date: Oct 2007
Posts: 82
Trader Rating: (1)
Default

i installed lithium on my gen 1 and it blew the fets
  #10  
Old 07-11-2008, 07:19 PM
snowboi1289's Avatar
snowboi1289 snowboi1289 is offline
Monte Carlo owner!!!
 
Join Date: Sep 2007
Location: Better state, Florida
Posts: 952
Trader Rating: (9)
Send a message via AIM to snowboi1289 Send a message via Yahoo to snowboi1289
Default

Now dude !! Come on, this is like a year old, please read the rules.
__________________
My youtube channel!
  #11  
Old 07-11-2008, 07:33 PM
Donziikid's Avatar
Donziikid Donziikid is offline
XMS Administrator
 
Join Date: Apr 2007
Location: West Branch, MI
Posts: 3,564
Trader Rating: (5)
Send a message via AIM to Donziikid
Default

As snowboi has said, Aaron, please review the rules and refrain from bumping old topics.

Closed.
__________________
XMS Rules & Guidelines | B/S/T Rules | How To Post Pictures

Greyscale Racing Member

The Collection:
Mitsubishi Pajero | AE RC18MT
TLMicroCrawler | Xmod ShowRoom | 'Yota XTruck
"The fun begins when the pavement ends."

Closed Thread


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

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

Forum Jump


All times are GMT -4. The time now is 06:00 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.