Slooooowww

[Ball Racing]

I ran the e-revo through some fresh cut grass with 7.4 li-po's
I had my GPS on board= a big 20MPH:-(

Then off to the paved highway= a big ole 23mph:-bang:ack

I thought maybe the speedcontrol was set to that 50% thing, so I came in and tried the settings.= It was in the fast setting, it is real bad slow in the 50% deal.


Maybe the reason they hyped up all the brushless potential was because IT Needs it.....

I light oil the motors bushings, broke it in easy until brushes had good contact patch, and after several packs I washed them out, and re-oiled.

If you run for 10- 15 minutes, the motors got to 167 degrees, so I don't think I can stack much more gear on it.

 

[Hardcore]

I ran the e-revo through some fresh cut grass with 7.4 li-po's
I had my GPS on board= a big 20MPH:-(

Then off to the paved highway= a big ole 23mph:-bang:ack

I thought maybe the speedcontrol was set to that 50% thing, so I came in and tried the settings.= It was in the fast setting, it is real bad slow in the 50% deal.


Maybe the reason they hyped up all the brushless potential was because IT Needs it.....

I light oil the motors bushings, broke it in easy until brushes had good contact patch, and after several packs I washed them out, and re-oiled.

If you run for 10- 15 minutes, the motors got to 167 degrees, so I don't think I can stack much more gear on it.

That really sucks man. My single motor wheely king has ample torque in it and it hits around 18mph i think with a good brushed set up

I expected the e-revo to hit around 27mph on pavement at least and provide enough torque for the dual titans to flip onto it's roof with ease.

From my experience the HPI GT 550 motors are faster spinning and also more torquey aswell. Could be worth trying them out for a budget way of getting some more speed and torque for next to no money

 

[4wdmt]

Oh man. So, it is true! it mus be butt heavy for the stock electronics. You are right about hyping the brushless thing. I guess I need to take out my brushless from my E and put it on my own E-Revo when it arrives.

 

[4wdmt]

BR. someone at Traxxas boards posted that with 7 cells. He got stock speed (GPS) of 29.9 for one set and 33.2 for another set of 7 cells.

Do you have any other batteries for testing?

 

[Ball Racing]

I just tried 5S li-po with the stock motors= thats 18.5 rated volts,
on pavement 26.2MPH
That is a gain 3.2MPH over the 23MPH I did orginally
but it took another 3.7volts to get it.

I must have a bad match of motors,
I see no way of doing 30MPH with stock set-up.

 

[Hardcore]

Maybe it's manufactured incorrectly and something is binding on the drivetrain?
That does seem pretty slow figures for a dual titan set up.
I'd check that and the gear mesh in case it's set too tight

If performance is still sucking and you don't fancy brushless, i recommend the HPI GT550 motors
More Rpm by approx 2,000 and about 20 watts more draw to match so a bit more kick

 

[B.M.T.]

If you're swapping motors, be aware of one being reverse rotation, so needing adjustable time or zero degree fixed timing...

That's really slow. Sorry that it's turned out to be a dud.

 

[4wdmt]

I wish I have an accurate way of determining my speed. I will be using duratrax 7 cells in my E-Revo. I haven't run it yet.

Any cheap radar gun available?

 

[Ball Racing]

theres nothing binding,
if you read my other post,on the "faster....." thread
I swaped out for 540 mod motors, with only ONE battery
7.4v, and ran 38mph.

 

[Digger]

4wdmt: Check out the toy section or toy clearance sections of Walmart, there used to be some Hotwheels radar guns for around $20 and they could be set to Hotwheels scale or 1:1 scale... It would give you an idea, at least even if it's not the most accurate...

 

[Ball Racing]

Titans are dead.................

Well after a run in the grass and smelling a bad smell, then a sudden stop, and smoke out the endbells=
the titans both died.
the brushes melted off one side, and part of it jamed the armerture.

I am not sure if they died together or when one jammed it sent alot of cuurent to the one that wanted to spin, and just heated it up or what...




The reverse rotation motor is not in stock until at least July.
So one more reson to go brushless.

 

[4wdmt]

I am sorry to hear that BR. Just buy the original titans and interchange the wire connections for the reverse rotation. They are 0 timed I believe so there will be no harm done.

Digger. I'll take a look at that HW radar gun. At least just give me an idea. I am also looking for a cheap GPS that will do the trick.

 

[twisted8]

br, i bet only one motor was actually working rite. ive had this happen with an emaxx before. then the one motor that is working rite dies as its being over stressed.

 

[Ball Racing]

Both motors run about the same temp,
and on my dyno they ae drawing about the same amp load, and turning about the same KV RPM.
So I don't believe thats it.
I've burnt up too many sets now for it to be one of the two motors.

 

[Digger]

What used to happen with the emaxx was that the bullet connectors on the motors weren't fully seated from the factory and many people would just slap fresh batteries in the truck and run it without checking them, which would cause one of the motors to lose contact, quit working and the other motor would melt down trying to drive the truck by itself as well as fighting the drag of the dead motor's magnets. That's not what's happening to yours since it's happened to more than just the original motors. The 540 sized 12t titans cooked just from the sheer voltage they were fed. Most 540 sized motors aren't up to running on 12volts or more. Even the 550 sized titans aren't up to the task of running on voltage much higher than the rated 16.8 volt maximum. The trinity monster maxx motors, which are also 550 sized, don't even seem to like running on 14.4 volts for very long. It's been my experience that they require a lot of maintenance with frequent cutting and fresh brushes and while they seem quick out of the box, they quickly lose that performance and even with rebuilding they only seem to run about the same as the stock 550 titans.

Except for brushless, there is no other brushed setup that gives the power and reliability of the stock 550 titans or other almost identicle tool-type motors(like the HPI GT550's). If you are not happy with the speed and power of the stock 550 titans, you are pretty much gonna have to go brushless to beat it...

 

[Digger]

One other thing that I think is influencing your outcomes would be the grass running. Every time I've run in grass, even fresh cut grass, every thing got really hot. The motors, batteries and even the speed control got burning the fingers hot. The constant drag caused by the grass definately contributed to the problem.

Grass almost needs a setup change, like the largest, tallest tires you can find and the smallest pinions you can fit...

 

[Ball Racing]

The 540 sized 12t titans cooked just from the sheer voltage they were fed. ..

The 12 turn titan IS a 550 can motor.

The grass I ran in had dirt showing, I cut it to say about 3/4" of a inch high.

I can take my clod, and run in the same spot, and not burn things up as bad.
And my clods run 30 mph, on 540 cans

Two motors in the revo died in the dirt,and never saw the grass, so there was no "drag"

 

[Digger]

The 12 turn titan IS a 550 can motor.

Never really looked that close at one, my bad...

The grass I ran in had dirt showing, I cut it to say about 3/4" of a inch high.

I can take my clod, and run in the same spot, and not burn things up as bad.
And my clods run 30 mph, on 540 cans

Two motors in the revo died in the dirt,and never saw the grass, so there was no "drag"

I don't know what to tell you then, your truck must be possessed with an insatiable appetite for motors. You should sell it to me so I can exorcise the demons!