Stock E-Maxx advertised 30mph by traxxas! *7cells. Is it safe?

[gixxer]

I saw the ad in the new car action and realized that they clamed nitro speed with the emaxx and tested 30mph. They also have a star beside it and it saids that they used 7 cells. My question is that is it safe to run 7 cells on my evx speed controller?

[Popop]

Quite good speed from stock anyway on a Big & Heavy wheeler like this one ...

Concerning your ESC, sorry I don't know if it can handles twice 7cells ... Just note rare are the strong BECs on 14cells ...

A far more cheaper more reliable choice could be an airplane controler made for up to 30cells with 50A continuous current (say what Car ESC manufacturers call 500A Max ESCs ....)
Jeti does such stuff for less than 60US$ , as does Kontronik, Graupner, etc. for a few bucks more ...

Good luck !
Bye


Popop
www.rcsaga.com

[r.c.dealer]

Looks like they used 2, 7 cell battery packs to acheive that speed with the stock Emaxx motors. To be on the safe side only use 2, 6 cell packs with the EVX ESC.

[Stregone]

He means 7 cells per pack, which are in series, for a total of 14 cells and 16.8 volts.

[Popop]

> He means 7 cells per pack, which are in series, for a total of 14 cells and 16.8 volts.
Obviously !

[Stregone]

Oh man I'm tired. I thought someone said 'the EVX can run on 12 cells so 7 will be a peice of cake' or something to that effect :rolleyes:

[Saboteur]

IM putting 8cells on my sedan, and gettin a mod motor with a bunch of delrin parts......Im sure that will definately cream a truck goin 30mph :D :cool: Try using two evx esc....i've seen a custom made MOnster truck with 4 evx esc's, and about 4-5 matched packs...It went about 30mph, but can really tug heavy objects.

[jdm3849]

just get an astroflight speed controller for 110 bux new and it has reverse and 20 cell limit but im not sure if it can take 2 motors if it cant just get 2 esc's and 4 packs and youll fly!:D

[baih]

the astroflight controller does not have brakes.
it uses reverse to stop like the first version
speed controller that came with the emaxx that
everyone was burning up.

[Grant Tokumi]

Here's an email I got from Traxxas when asking a similar question. 8.4 volts (7 cells) per side max:

At 11:19 PM 10/10/01 -0700, you wrote:
>I have an EVX speed controller that I want to use in conjuntion with a
>reciever battery. Can that be done? How? Cut/disconnect the red wire of
>the wire connecting to the receiver?
>
>Also, the EVX is made to use two (6) cell batteries. I want to utilize a 12
>volt, 7Ah gel cell battery to power the motors. Can this be done? Do I
>just connect the 12 V gel cell to one of the battery connectors? Will
>splitting the connection into 2 (2 connectors in parallel from the same
>battery) and plugging them into the 2 battery connectors on the ESC be
>better?

Hello,

The max input voltage for either side of the EVX is 8.4 volts. 12 volts
will burn out the ESC. You can use a receiver pack along with the
EVX. You do not need to cut any wires on the EVX to do this. Simply plug
the receiver pack into the BATT slot on your receiver.

You can view all of our vehicles, prices, exploded views and parts lists at
our website. www.traxxas.com and www.t-maxx.com
If you need further assistance, please feel free to contact our Customer
Service department at one of the following:

Best regards,

xxxxxxxxxxx,
TRAXXAS Customer Service

Monday through Friday, 8:30am to 9:00pm Central Time

US Customers only 1-888-TRAXXAS
Outside of US 972-613-3300
Fax 972-613-3599
e-mail support@traxxas.com
Address 12150 Shiloh Road
Dallas, Texas
75228 USA
-----------
TRAXXAS UK
Voice 44-117-956-1002
Fax 44-117-956-1121
Address P.O. Box 1128
Winterbourne, Bristol
BS17-2SH, England

[gixxer]

Does anybody sell straps for 7cells per side on emaxx then? How come car and driver trested top speed with 6 cell per side and went all that trouble to change motors to only achieve 25mph where as traxxas is saying that 7 cell per side will achieve 30mph stock!