PF Maximum Voltage

[Marxpek]

That's a shame... but we are going a lot off topic here, so lets go to the personal messages or move to another topic (fastest Lego car topic maybe)

[rkkm]

yeah, now i need to know how to clean em up, nothing really works, two red gears do normal sound but white second one ( this smaller ) is doing all of bad sound, without it, all gears work well...

[mocbuild101]

Try putting all the gears in a container (with a lid) with warm soapy water and give it a good shake, then use a old toothbrush to remove anything that is left.

Don't forget to re-grease the gears after they are dry, with a light grease, not oil.

[rkkm]

Ok, i had to say that this topic is ended ( for me ), and i get much moore help that i want :) For anyone who will need some knowledge, i had to say what i discovered ( hehe discovered :D ), lets start of voltage, we will take for example 3 type of batterie set:

2 li ion xtar 800 mah 14500 3,7 v batteries ( we will name it A )

6 brand new alkaine aa belgian super life cells ( We will name it B )

 and 3 li ion xtar 800 mah 3,7 v batteries ( we will name it C ).

So, now ill talk how work they will normal PF motors and how work with recievers. Set A work well in all type of vehicles or anything, they are rechargable, lighter than set of 6 alkaines ( just 40 gram instead of 150 grams from aa alkaine 6 ). It work good in normal and slow vehicles, but worse than set B, but still cheaper, they would work great when put them in really light vehicle. I prefer them in rc unit - set A a bit worse if we mean power than set B, but set B stand 30 minutes drive, set A about 45 minutes and they are rechargable.

Lets talk about set B, great for fast vehicles, but not long runs,  or for beating records of speed.

Now set C, and it is really complicated, normal PF work well and using them in fast vehicle will be awesome but just in one configuration - 2 aaa battery boxes, one powered by set A and one by set C. To battery pack powered by set A connect s brick ( recievers ir are hopeless for long runs... ), to sbrick connect 2 servos. To battery pack powered by set C connect one switch and connect 2 buggy motors to switch, then just use one servo to turn on buggy motors and second servo for steering. Remember, Pf motors are M L and XL, not buggy, and now about buggy motor powered by set C, it is kinda tricky, firstly, conected to just battery box will work well BUT, do not change polarity radically ( rotation direction, for example from driving forward to backward ), cause motors will imadiatelly stop and stop working for few minutes, you need to wait till motor stop  to change polarity. 

Now Rc unit, soo its complicated too, best working with 2 li ions, better with 6 alkaines but theyre not rechargable, and will discharge in about 20-30 minutes of driving... With set C there are few rules, not driving as fast as possible from start - just like in real car, dont stard driving in 3th gear ( rc pilot got 3 speeds ). U have to start in 1st speed, then 2nd and finally third, or if u dont want to - just discharge batteries to 3,7 volt or less, u wont have to. Next rule, if u drive from 3 speed or drive too long, model can stop and if u hear - rc unit will do sounds like zzzzzzzzz and u will have to : turn off rc unit, take off battery cover, take off one battery then put it back in a second, and put battery cover on and turn on model - it will work normally. i have to say that im driving my rc model from one month using 3 li ions on quick runs - 3-10 minutes, and its not firing or blowing up as some people would say.

I have done a tricycle for speed, with set A it was driving  21 kmh max, set B 22 kmh, set C 24 kmh,  but performance was worse in set A, it was getting fast so slowly compared to set B and C.

Now about using set C generating 12,6 volt at full charge with ir reciever - i have tested it with v1, wont risk my only one v2. It work bad with it - motors are not as fast as connected to switch or battery box, and reciever was smelling bad but works till today in my modified crawler as reciever for winch and leds.

Now costs:

Set A cost 10 euro for batteries and charger, best is charger with lcd - it says every info about batteries, it cost about 15 euro, normal charger cost about 6-7 euro.

Set B cost about 1,20 euro in Germany ( Aldi shop ) ( when i was in germany 2 weeks ago i have bought 80 alkaines cause it was 15 euro cost :) )

Set C cost just  5 euro more than set A.

 

So what mean all of this? even at 12,6 volts generated by 3 li ions fully charged nothing from lego PF or Rc Systems except PF recievers will fry, but for rc system best will be 11 - 11,5 volts, max 12,6 volts but other motors from standard PF will handle more but remember - using that voltage will make shorter motors life, they will die much faster so watch out for rc system, other motors are cheap :)

 

Thanks everyone for help, i get much more knowledge and was able to write this post, hope it wont help only me but more people with same question about voltage.

And remember, doing really fast vehicles ( 20 kmh + ) remember about doing stable construction, my tricycle was that unstable that even on quite small turns it was driving on 2 wheels, one was in the air.