evx and lipo
 

I have a evx with titans. I was wondering how to hook up a lvc to it for lipo.
I think i know but want to make sure. The wires to the batts on each side of the motor wires. Is this right?

and it works???

I don't know if it works. I haven't got my lipo cells to try it yet. I like to make sure I have it right before hand.

In general I will use one. EVX (HV-MAXX as well) have two sets of power connectors, to connect internally two batteries in series and provide BEC only from one battery pack. Check image for details...

Artur

Attachment 1540

Here is a pic of what I have. You can see the wires going to the lvc. Do I have the right wires hooked up to read the 14.8 volts?

Edit
I missed the lvc in your pic. I have the right wires hooked up. Thanks alot artur. I knew you could help me. :017:

Yes, it is correct.

Artur

P.S. Any time, Leroy!

I just ordered a lipo shield from dimension eng. I want to hook it up as you did. What is the best way to make the actual connection. Your diagram shows where to make, but Im looking for how to make? I cant tell from the other photo. Should I just pull back some of the cover and solder right in?

Thanks.

As long as it is hooked to the right two wires. It will not matter on how you do it.
As long as it has a good connection. Your perference is up to you.

I will agree with Leroy it is up to you.

- cut heatshrink and unsolder wire from W.S.Deans connector
- put new heatshrink
- resolder wire back to connector with LVC wire
- melt the heatshrink

Repeat the same for other side...

Artur

P.S. It is possible to do that inside EVX, let me know if you want to do that, will look cleaner...

I just got the lvc today in the mail. I'll take a look at it tonight and see what I want to do. Hurry up maxxamps and send those packs!!

hopefully it will work:p

Here is what I came up with. I cut off the stock tamiya connectors and used the deans ultra. Kinda tough to solder them on as the wires from the esc are so short. To lazy to take the esc outta the truck.

The big question is do I have it hooked up correct??

(The green part on the wire is some heatshrink as I boogered the case of that thin wire a bit.)

Looks good! You've got everything wired correctly.

your running two 2s2p 7.4 lipo cell packs? i have a feeling that those titans will burn out.

Why would 4s be worse than 14 cells? The titans hold up to 14 cells OK.

Why, they even last on 14 cells.

jhautz, can't lipo be alot higher in voltage when charged then a nimh battery. i remeber a friend using 14 cell ib 4200's and burnt out 4-5 motors....thats was funny a dom?

If you add spacers in between motors and bracket it will help a lot with cooling problems. Better then extra heatsinks... Will work only with motors with built-in fan, like Titans, but not with like Trinity mild/wild/pro.

Artur

ya, i made some custom H sinks for mine alswell

Even though they are charged at a high voltage, the voltage noticably goes down when accelerating, so does the amperage.

I bet the titans would be able to surpass a test or two with 5s lipo or 16 cells.

well i figured that.....sorry im a lipo noob guys

And 20 cells with proper gearing :)
18-cells was my favorite setup, so 5LiPo won't be the limit for Titan's, but would be for EVX. Super Duty XR would be sligtly better in that respect...or modified EVX

And bottom line not more then 180-200W from single 550 can

Artur

@ turbo4; do you like your dimensionengineering lipo-shield?

I found the lipo put more punch out so the motors would get warmer faster. I dropped the gearing a little and it would run cooler. It would also wheelie in second gear almost at well.

Yes, Im going to run (2) 2s2p 7.4 maxxamps 6000mah's. I have not got the packs yet(should get here this week) I have not even drove the truck yet, had it a week now just looking at it. Usually lipos will run 1.0v to 1.5v over there rating at a full charge. A lot depends on the quality of the charger it seems. Since I have not ran the truck I cant comment on the Lipo shield.

Joel

Where can I get a set of heat sinks for the stock titans?

You can check towehobbies, im sure they have got one.

or you can make one, what i did was get a 1/4 inch alu pipe and cut it in half and then with a band saw made fins and superglued them to my titan motors...

i couldnt belive it that it worked so well.. and has cheap Money wise:)

hmmm interesting... so you can run lipos on the evx? whats the little gadget that was mentioned earlier? does that allow the use of the lipos? anyone got a link?:030:

dont exceed 200watts per 550 can... good advise!:027:

so does 16 cells burn out the exv? i have some extra cells layin here..... running 14 now.

What do you need a link to?

16 would be really pushing it in my opinion. I wouldn't.

The "thingy" is a LVC or Low Voltage Cut-off which prevents the Li-Po's from over discharging and damaging themselves.

ahh thanks pro!! perfect explanation..

Hey, my pleasure!

is it possable to run the evx off one 4s lipo?

I am not sure if it is or not. You would need to have an extrenal power supply.
I am not sure on the internal power part.

Yea you can. Just sauter the two wires which dont use the bec together and you wont have any problems (got it off a crawler site).

That is for a low cell count though. not 4s. If you did that you will put 4s voltage thru the bec.

Agree 100%!
As Leroy mentioned before, you can run from 4S if you use external power (separate receiver pack or UBEC). Just keep EVX power switch off or get rid of it, keeping wires isolated.

<TABLE class=tborder cellSpacing=1 cellPadding=6 width="100%" align=center border=0><TBODY><TR title="Post 79019" vAlign=top><TD class=alt1 align=left>revopqrs</TD></TR><TR><TD class=alt2 align=left>dont exceed 200watts per 550 can... good advise!:027:

</TD></TR></TBODY></TABLE>

Whats wrong with my advice? With proper cooling and some mods on motor you can squeeze more power from it...
http://forum.rcdesign.ru/index.php?a...e=post&id=7513
http://forum.rcdesign.ru/index.php?a...e=post&id=7515
Artur

you added bearings?

Nice work!

Yes, and beefed-up brush holders :)
As result extra Amps without fallen brushes, avoiding something like this

<TABLE class=tborder cellSpacing=1 cellPadding=6 width="100%" align=center border=0><TBODY><TR title="Post 79524" vAlign=top><TD class=alt1 align=left>Procharged5.0</TD></TR><TR><TD class=alt2 align=left>Nice work!</TD></TR></TBODY></TABLE>

Thank You, it was cool project

Artur