Need help deciding what to power the E-Revo with! - RC-Monster Forums

R00ST · 10:11 AM

I have my E-revo almost done. I currently have two novak HV systems, one new, and one that has a few issues (acts like its cogs...isnt very smooth) I have never run this in a maxx or heavy monster, but it did have a lot of power in my xxx-s! (not a good comparison I know).

I am thinking I will want more power than what the hv-maxx can provide for me.

What are other comperable systems to the hv in price? I want somthing SUPER reliable. What about these new MGM controllers? I dont follow brushless too much, last I was checking around everyone was running the hackers (8s I beleive in the maxx's, with comp controllers that were frying).

I would like to spend no more than 300 (less is better) and I would be running 12-14 cells (14 most likely)

Can anyone reccomend a setup for me?

*edit* I also want to add that I like to do some slower paced rock crawling and true offroading with my trucks, so if there is one with a lesser showing cogging, that would probably be the best. How is super low throttle response on these non-sensored motors? sometimes I like to just slowly crawl around and up curbs and over rocks, would this be possible, or would it be 1/4 throttle or nothing?

captain harlock · 09.22.2005, 10:12 AM

Most people here uses the 9L and 9920 setup and its a very good setup for 12-14 cells in a Revo. I think not that you will spend much on such systems and you will get the best of service here at rc-monster.com. Just a little while and the rest of the gang will be here to assist you more than I do.

R00ST · 10:56 AM

is the 9l the best overall for the E-revo type of truck? I want decent power, but good runtime is also important. Would it be wise to choose a different motor (or even this one) and run on 12 cells instead? I saw the one MGM controller is only 180 and can support up to 12 cells, is this better than the warrior 9920?

or would I have to get the higher rated mgm?

also, looks like the 9l has 5 mm shaft. can you safely just bore out a normal 32pitch pinion?

coolhandcountry · 12:07 PM

For the 5mm shaft part. Mike has the best gears I have seen. I think the 10 L may do you better than the 9L. It has a little more torque down low. Give you a little better run time as well. Dafni was running an evo as well. He like the 7xl over ther other motor tried. I run a 9 xl. It will go slower than I walk. I also do some curb climbing. I have run form 14 -18 cells so far. I am real happy with the motor. I have got 30 minutes of run time on gp3700 18 cells. It is in a emaxx.

As far as money. Xl feigaos is about 90 the L is about 80. The esc is up to you 9920 200 so it is in the price of your budget. good luck.

R00ST · 09.22.2005, 01:19 PM

Alright so the 10L would be a bit torquier, and a bit more efficient? do they make a 10XL? What are the advantanges of the longer cans?

Wouldnt running MORE cells (more voltage) decrease runtime? If you run 14 cells the same as 12 cells shouldnt the 12 cells last longer? Can 12-14 cells be run on a 10l?

Batfish · 09.22.2005, 01:44 PM

R00ST,
Based on what you are looking for, my first suggestion would be to take the good HV-Maxx you have and get the right gearing for it to run in the Revo.
Here's why:
1 - Climbing. If you really want to do super-low-speed climbing and crawling, the HV (or another sensored system) is the best choice. Although both the Warrior 9920 and the MGM controllers can accomplish low-speed running, neither will accomodate the rock-crawling speeds as easily as the HV. This is based on my own experience with both makes of sensorless controllers.
2 - Speed. You didn't say you were looking for any speed records, and I'd expect (with appropriate gearing and cooling) the HV could get you in the upper 20s for speed.
3 - You've already got it. With an investment if $20ish in different sized pinions you can find out if the HV will work for you.

The sensorless systems easily blow away the HV for speed and are definitely preferred here for bashing and racing. They can also accomplish decent, cog-free, low-speed movement. The low-speed of the sensorless is not the low-speed you'd typically use in crawling.
That said, you could still (most likely) gear a sensorless system to accomplish some casual rock-crawling, but my personal choice for that task would be the HV.

Essentially, you'll need to weigh your choices. If you want the best rock-crawling capabilities, you're probably better off with the HV (geared and cooled appropriately). If you want speed and bashing power, you're surely better off with a sensorless system (also geared and cooled appropriately).

R00ST · 09.22.2005, 02:12 PM

good information, thanks. I have heard that the hv dosnt have the best of all run time/efficiency? I have never run anything but novaks stuff (5800s and the hv I ran in the onroad lol). Maybe I will give it a go first and see how I like it. I do want power, especially for times we hit up the beach/dunes as that really sucks the power. I also like doing some higher speed cruising, and just overall having the power to spin the tires in the loose stuff and kick rocks around :)

I know my buddy decided against the evx/dewalt 750 combo in favor of the hv, so I guess I will install it and find out if it works for me, and if it dosnt I will sell it to him. I got this new one for 220. It was an open box item on ebay (guy bought two to put in this nice g-maxx but sold it before using them)

What would be the best starting gearing for the hv, running on masher 40 series tires? I was thinking maybe 13/66? I know the hv is known to run hot, so I might end up going lower if I cant keep it from thermalling.

Dafni · 02:38 PM

Can't help you with the HV gearing.
Coolhand is right, my favourite motor in the Revo is by far the 7XL. Nice mix of runtime and speed, and tons of torque.
You can run it on 12 to 18 cells. I mostly run 14, and geared to an optimistic 35-40mph I can run pack after pack without thermo-worries.
I once ran 16 cells and geared it for a theoretical 50mph, and the motor was well in the save range after a full pack on a parking lot.

Edit: I found the 9L was nice and smooth, but the 7XL is even smoother. I can crawl around easily, with gobs of torque.

R00ST · 09.22.2005, 02:43 PM

is the 7xl lehner/feigo or what? does mike stock it? (didtn see it listed)

I am going to try the hv first, since I do own two of them..lol.

What kind of run times do you get dafni with the 7xl? (highest/lowest? didnt you get like 30 mins of runtime from one setup?)

Dafni · 09.22.2005, 02:51 PM

I have the Wanderer 7XL, but this is essentially the same as the Feigao.

I have never really checked, but on a track, under full race conditions, I managed 10 mins without any decrease in performance.
Once I was bashing/crawling/hopping around the house, with a friend. We exchanged the transmitter alot, and I would be we drove it for 45 mins, and then it got too dark to drive :D

Yepp, I agree, I would test it with the HV, too. If I had it lying around anyway. You can use this wheeltime to dial in the truck, and upgrade the motor later.

And, yeah, Mike can get you whatever you want. Even if it's not listed, just ask him.

R00ST · 09.22.2005, 06:04 PM

so how exactly do the motor turns affect the power delivery? I was thinking the lower the turn, the hotter the motor? (hence the reason a 10l would be more efficient, but probably less power than the 9<8<7l's?)

can all the motors be run on what the controller can handle? (I think the 9920 handles like 18 cells?)

but best efficiency would be on 12 cells right?( or lowest runnable cell count)?

coolhandcountry · 09.22.2005, 06:19 PM

The 9920 can run 20 cells. The efficiency is based on the motor. Example A 8L will run highest efficiency on 12 cells while a 10 will be most efficent on 16 cells. The higher turn motors will take more cells so you can get more power out of it. The higher turn motor has a lower kv Rpm per volt.

squeeforever · 09.22.2005, 06:55 PM

Quote:

Originally posted by R00ST
but best efficiency would be on 12 cells right?( or lowest runnable cell count)?

actually the higher the cell count on a motor the more efficient because it wont be as hard on the batteries because it wont pull as many amps from each cell. basically, the higher the cell count the better the performance and better efficiency. only downside to running more cells is weight. i plan on going to 16 and get a 7xl.

MetalMan · 09.22.2005, 07:32 PM

Quote:

Originally posted by squeeforever
actually the higher the cell count on a motor the more efficient because it wont be as hard on the batteries because it wont pull as many amps from each cell. basically, the higher the cell count the better the performance and better efficiency. only downside to running more cells is weight. i plan on going to 16 and get a 7xl.

That only goes to a certain point though. The most efficient system will be running as high of voltage as possible to get the motor spinning to 40,000RPMs loaded. Basically, efficiency will be highest with the slowest motor on the largest number of cells (still near 40,000RPM). Just taking a motor and running more voltage through it won't necessarily make it more efficent; it has passed its most efficient RPM range, and so will get hotter.

The Feigao 7XL seems to be the best motor choice for a monster truck on 14-16 cells.