Multicell voltage solution

xxspeednplayaxx · #1 01-09-2004, 07:06 AM

ok well i have lurked these forums for quite some time and have noticed that many people fry their car after installing a 6th cell, one cause of this would be that the ESC cant handle 8.4V or higher, so heres the solution, a compeptitive esc http://www.ipdraceshop.com/pd_r18.cfm
the site is for micrors4's but im pretty sure this baby would work. if anyone else knows whats dying in out xmods when we up the volts, please tell and ill try my best to hunt for a solution part

TypeZer0 · #2 01-09-2004, 10:25 AM

6 cells is 7.2 volts and for 99% of the people it runs fine. for teh 1% of the people, they stick in a 7th cell or use 9volts instead and thus frying them. 7.2 volts is fine in xmods, 8.4+ is a little risky

neurokinetik · #3 01-09-2004, 11:03 AM

Well, all of the electrolytic caps (the little black cylindrical objects) on the ESC board and receiver board are only rated for 6.3V. They would be the first area of concern, and an easy fix. There is a zener diode nearby that may drop the voltage down to 5.3V, but I need to do some measuring and verify this. I suspect that this diode may be the part that burns out and causes receiver damage.

It's really cold in Buffalo right now, and since I will be staying indoors as much as possible this weekend, it should give me some time to do a little more reverse engineering.

theMonster · #4 01-09-2004, 01:05 PM

I'm SOOOOOO friggin' sick and tired of posting this!!! I am running 6 Rayovac IC3s measuring 1.45V each on a Fluke Meter and it runs FINE!!! Has been for over a month!!! I got friggin' sick of all this crap, so I stuck in 6 Energizers measuring 1.53V each on the Fluke meter and it ran FINE!!!!! Therefore we can see that both 8.7 and 9.18V did NOT do any damage. Where the hell are you people getting this stuff from that 7.2V, 8.4V or 13 joules will fry it. WE DO NOT KNOW until we sit there and just keep adding cells until it does fry! and I'm not adding a 7th cell to see. So for CRYING OUT LOUD if you have not tested it QUIT POSTING CRAP THAT IS UNFOUNDED BS!!!!

BC....could we please make a sticky on this.....it's getting old....FAST. This question is asked every day and somebody always prints some BS in reply.

TypeZer0 · #5 01-09-2004, 04:39 PM

geez, calm down. he's just trying to help out. so what if you're dumping 8 to 9 volts in and it's fine, doesn't mean every xmod out there was built exactly the same and can withstand the same amount of juice.

yes, it is getting quite repetitive telling people 6 cells is fine but you shouldn't lash out like that

xxspeednplayaxx · #6 01-09-2004, 05:16 PM

bashing and slashing will leave your peers dashing...

anyway im just focused on making an xmod safely run 9 volts w/o no risk, and so a high power spped control is the first step, im goining to now hunt for either a replacement pcd that is of resonable price....

btw neuro those little black things you were speaking of, their the things that resemble a resistor but only standing up?

theMonster · #7 01-09-2004, 07:53 PM

Every time I see this question form now on, I'm just gonna make up some crap and tell-em it'll blow up at whatever V, seeig as how that's what everyone else does and if nobody takes the time to search the posts. BTW...These Cars SHOULD be able to handle the same # of V throughout, they're all the same except for body, front mounting tab and driveshaft.

xxspeednplayaxx · #8 01-10-2004, 10:07 PM

this isnt in haste or notting, but your wrong... these cars all differ electricly slightly because of their being mass produced, which is why some people have to return them so frequently.

please note themonster i dont want to argue and agree with your veiws, i made this thread because i know alot of people want to run more than the socalled limited 8 cells, and so this is like step 1 of 20 to beable to do this, also if you reply please dont be all nuts i dont want this thread shut down, it has potetial to serve valuable pcb info ...if ypur mad or something ill be happy to have a pow pow, my email is xxspeednplayaxx.

on a happier note i found out what a electrolytic cap is (pic) http://www.evox-rifa.com/n_america/electrolytic_top.htm however i never opend up my car to see my chip so where and how many of these electrolytic caps are their