Cheapest 18.5v brushless setup on E-maxx

I have been looking at getting a feigao 9xl motor w/ high speed bearings. BK electronics 12020 controller (with Maxamps 10,000 mAh 5s lipo pack, by my calculations this setup would run close to 600 bux w/ shipping, i have been into R/C cars since i was 15 ,kinda got out of the hobby at 18 or so, i am now 22. The e- maxx is the first electric truck i've owned. After doing some research b4 getting back into the hobby it was obvious that the technology of electric rc's has advanced exponentially and much more potential than Nitro could ever dream of. Since i cannot find the BK electronis 12020 in stock anywhere, can anyone give me a good alternative to this ESC

[tashpop]

looking in terms of cheap i think this will work.
mamba max esc
1 dewalt 36v battery= 5s2p a123
kb45 motor (you'll need 6mm pinions, or turn down the motor shaft)
or
feigao xl motor w/clamp and heatsink (will cost a little more)

is this the new emaxx or the old one? if its the old one, it will take more $$ to upgrade the drivetrain which truely is part of the conversion.

[jhautz]

If the MMM truely is comming in March then that would be your setup. $300 motor/esc combo. Then you just get whatever lipo you want.

[sikeston34m]

Originally Posted by 10kmahE-maxx

I have been looking at getting a feigao 9xl motor w/ high speed bearings. BK electronics 12020 controller (with Maxamps 10,000 mAh 5s lipo pack, by my calculations this setup would run close to 600 bux w/ shipping, i have been into R/C cars since i was 15 ,kinda got out of the hobby at 18 or so, i am now 22. The e- maxx is the first electric truck i've owned. After doing some research b4 getting back into the hobby it was obvious that the technology of electric rc's has advanced exponentially and much more potential than Nitro could ever dream of. Since i cannot find the BK electronis 12020 in stock anywhere, can anyone give me a good alternative to this ESC

Hi 10K and WELCOME to the RC-Monster Forums!

It is true that the technology of Electrics has advanced by leaps and bounds in the last few years. It really puts those "Bumble Bee" sounding motors to shame these days. LOL

If you're new to the Lipo scene, please take the time to educate yourself on the care of them. They do require special care. They have their own charging requirements AND can NOT be completely discharged. The discharging requirement is usually handled with a Low Voltage Cutoff that is built into the ESC. I don't know if the older style BK's have this or not. Typical Low Voltage Cutoff setting is Minium 3.0 volts per cell. A 5S LVC setting would be 15 volts.

My first instinct was to go with a large capacity Lipo setup to get as much runtime as I could get. It seems like most things are a trade off though.

10,000mah Lipos are heavy when compared to smaller capacity ones. I have a pair of 7.4v 10,000mah Lipo packs that I have ran a few times. I also have some 7.4v 4000mah and some 7.4v 5000mah packs that I run in a 4S configuration.

The 10,000mah 4S setup will yield almost an hour of runtime. But it's harder on the drivetrain in carrying the added weight. One of my 7.4v 10,000mah lipos weighs 17 ounces. That's over 2 pounds of batteries. A 5S setup would weigh even more(about 9 ounces more).

When I run a 5000mah 4S setup, I get anywhere from 25 minutes to 35 minutes of hard run time. BUT........the 5000mah is alot quicker than the larger Capacity setup. It's lighter, which makes the truck more nimble. It also handles much better.

If you plan on running 5S, then plan on using a BEC circuit. MOST bec's that are built into the ESC will burn up on the higher voltage setup. I would recommend a Castle Creations BEC for this. I have a few of these, and they are very reliable. Very adjustable too. Check it out here:http://www.castlecreations.com/products/cc_bec.html

Then buy you one here:http://www3.towerhobbies.com/cgi-bin...VSEARCH=CC+BEC

By using an external BEC, even on lower voltage setups, this takes alot of heat load away from the ESC. This makes for much cooler ESC temps and also makes the ESC live a very long time.

In most cases, you get what you pay for. Cheap is a challenge. LOL

My favorite ESC at the moment is probably the Quark 125 amp Monster Pro.
You can check it out here:http://quarkbrushless.com/pro_carcontrol_125b.htm

The MM might be able to handle your setup, but I doubt it. A few people have had success running the MM on 5S in lighter, low geared setups. Putting them on 5S is NOT recommended by Castle and immediately voids the warranty weither it works with it or not.

The Monster Mamba Max is a different story. Alot of people are anxiously awaiting it to come out. From everything I've read, it would be a good choice for your setup.

If you're looking at building an E maxx, then please, take a look at the NEW E maxx.

It has an upgraded drivetrain that is ready for brushless power. It might be a little more upfront for the truck, but cheaper in the long run. You won't be laying out extra money for transmission upgrades and tougher drive shafts.

I hope this helps and please keep us informed on how things go.

[Serum]

What do you expect from it in terms of speed/endurance?

I wouldn't go for those heavy packs either; i am currently working this maxx with 5S 4000mAh packs in 2P.

You could go for the Mamba maxx controller and aim for 4S; 4s2P of the true-rc 4000 packs (giving a total of 8000mAh) is very nice. And MUCH lighter than these heavy maxamps 10k cells!

Bytheway! you could also check the rc-monster store for the castle UBEC!
http://www.rc-monster.com/proddetail.php?prod=castlebec

here is the beauty!

[sikeston34m]

Hey! I didn't know RC-Monster carried those.

I need to take another look through the store. Mike has added alot of stuff.

Originally Posted by sikeston34m

Hi 10K and WELCOME to the RC-Monster Forums!

It is true that the technology of Electrics has advanced by leaps and bounds in the last few years. It really puts those "Bumble Bee" sounding motors to shame these days. LOL

If you're new to the Lipo scene, please take the time to educate yourself on the care of them. They do require special care. They have their own charging requirements AND can NOT be completely discharged. The discharging requirement is usually handled with a Low Voltage Cutoff that is built into the ESC. I don't know if the older style BK's have this or not. Typical Low Voltage Cutoff setting is Minium 3.0 volts per cell. A 5S LVC setting would be 15 volts.

My first instinct was to go with a large capacity Lipo setup to get as much runtime as I could get. It seems like most things are a trade off though.

10,000mah Lipos are heavy when compared to smaller capacity ones. I have a pair of 7.4v 10,000mah Lipo packs that I have ran a few times. I also have some 7.4v 4000mah and some 7.4v 5000mah packs that I run in a 4S configuration.

The 10,000mah 4S setup will yield almost an hour of runtime. But it's harder on the drivetrain in carrying the added weight. One of my 7.4v 10,000mah lipos weighs 17 ounces. That's over 2 pounds of batteries. A 5S setup would weigh even more(about 9 ounces more).

When I run a 5000mah 4S setup, I get anywhere from 25 minutes to 35 minutes of hard run time. BUT........the 5000mah is alot quicker than the larger Capacity setup. It's lighter, which makes the truck more nimble. It also handles much better.

If you plan on running 5S, then plan on using a BEC circuit. MOST bec's that are built into the ESC will burn up on the higher voltage setup. I would recommend a Castle Creations BEC for this. I have a few of these, and they are very reliable. Very adjustable too. Check it out here:http://www.castlecreations.com/products/cc_bec.html

Then buy you one here:http://www3.towerhobbies.com/cgi-bin...VSEARCH=CC+BEC

By using an external BEC, even on lower voltage setups, this takes alot of heat load away from the ESC. This makes for much cooler ESC temps and also makes the ESC live a very long time.

In most cases, you get what you pay for. Cheap is a challenge. LOL

My favorite ESC at the moment is probably the Quark 125 amp Monster Pro.
You can check it out here:http://quarkbrushless.com/pro_carcontrol_125b.htm

The MM might be able to handle your setup, but I doubt it. A few people have had success running the MM on 5S in lighter, low geared setups. Putting them on 5S is NOT recommended by Castle and immediately voids the warranty weither it works with it or not.

The Monster Mamba Max is a different story. Alot of people are anxiously awaiting it to come out. From everything I've read, it would be a good choice for your setup.

If you're looking at building an E maxx, then please, take a look at the NEW E maxx.

It has an upgraded drivetrain that is ready for brushless power. It might be a little more upfront for the truck, but cheaper in the long run. You won't be laying out extra money for transmission upgrades and tougher drive shafts.

I hope this helps and please keep us informed on how things go.

Thanx for the info, i have taken to time to learn a good bit about the precautions and dangers of lipo, although i still plan to get the free lipo dvd from maxamps.

Unfortunately, i have the old chassis e-maxx :( and when i bought it i had heard about the new e-maxx but didn't know when it was coming out, it came about a month after i bought mine, i was really pissed.

I was thinking of getting 10k pack under the idea that a higher mah rating will allow the motor to draw more power, which seems to be a dumb idea. I am trying to keep the truck a light as possible, i've got her down to about 8lbs without batts.

Why does the amount of voltage a ESC can handle drop signifcantly with a BEC ?

[sikeston34m]

Originally Posted by 10kmahE-maxx

Thanx for the info, i have taken to time to learn a good bit about the precautions and dangers of lipo, although i still plan to get the free lipo dvd from maxamps.

Unfortunately, i have the old chassis e-maxx :( and when i bought it i had heard about the new e-maxx but didn't know when it was coming out, it came about a month after i bought mine, i was really pissed.

I was thinking of getting 10k pack under the idea that a higher mah rating will allow the motor to draw more power, which seems to be a dumb idea. I am trying to keep the truck a light as possible, i've got her down to about 8lbs without batts.

Why does the amount of voltage a ESC can handle drop signifcantly with a BEC ?

How much power the packs will deliver is related to it's capacity. But that's not the only thing. It has to do with it's "C" rating. Most 10,000mah packs are 10C. This means they will deliver 100 amps continous.

However, if you get 5000mah packs that are 20C rated, they will deliver 100amps continous also.

A 4000mah pack that is 15C will deliver 60 amps continously.

It's not the ESC's voltage handling ability that drops. It is the internal BEC. The one that's inside the ESC on the brain board. Most interal BEC's are linear. The external ones are usually the switching type.

A linear BEC just "burns off" the excess voltage to transform pack voltage to usually 5 volts. This creates ALOT of heat. The higher the pack voltage, the more heat there is. Most recommend using an External BEC on anything above 3S.

By using the CC BEC, you can also adjust it to a 6 volt output. This speeds up your servos and makes them stronger.

Originally Posted by Serum

What do you expect from it in terms of speed/endurance?

I wouldn't go for those heavy packs either; i am currently working this maxx with 5S 4000mAh packs in 2P.

You could go for the Mamba maxx controller and aim for 4S; 4s2P of the true-rc 4000 packs (giving a total of 8000mAh) is very nice. And MUCH lighter than these heavy maxamps 10k cells!

Bytheway! you could also check the rc-monster store for the castle UBEC!
http://www.rc-monster.com/proddetail.php?prod=castlebec

here is the beauty!

I would like to be able to hit atleast 50mph, hopefully 60, as far endurance i would like for it to be as reliable as possible

I'm dumb, what do you mean by 2P, when u say 4000mAh packs in 2P?

Any idea when this monster mamba max is coming out ?

About a yr ago I bought a used Emaxx which wasn't running. I've been through it completly and it's currently running on upgraded S600 motors on 7 cell pacs (16.8v, less than 4S voltage). You're going to have to plan on driveline upgrades. Mine has destroyed the centers and once those were replaced (UE titanium and UE cups), I've started twisting wheel axles.
I'm guessing that after I upgrade those to 3.3 style cvds, I'm going to have diff probs.

The setup you're talking about is way more power. You need to plan on driveline upgrades, or plan on a lot of downtime waiting on parts. I'm building a new Emaxx based on FLM ext alum chassis, 8xl, Quark125b, flm hybrids with UE 6 spyder diffs, GM single speed, UE idlers, 3.3 cvds, and GM race suspension. Reading here, was apparent was going to be way expensive to run powerful bl in stock emaxx due to needed upgrades. I would consider selling your current Emaxx and getting the newer one and make it brushless. Its better suited to handle it and will cost less in the long run.

Well that sux, i don't make alot money, so thats kinda outta reach, so i dunno what i'll do

[suicideneil]

Sell a kidney.

To get your emaxx BL ready, I would say do the 3.3spec conversion (knuckles, turnbuckles from tmaxx 3.3 and driveshafts), then add an RCM steel idler to the tranny; that should be fine for all but the most overpowered setups *nods to Sike*.
Shouldnt cost you more than about $50 or so, then just add your choice of BL setup, but the MMM seems like being the best value given how smooth the new software/firmwire is, bundled together with a Neu designed motor.

Yah it sounds like the MMM will be perfect, i have to save up the money anyways so if it does come out sometime in march i should have the money by then. Do you know where i can get more info on this package ?

[jzemaxx]

A cheap setup would be one of the XL motors and a BK 9920. You should be able to get all of it under 300.

[suicideneil]

There is more info on the MMM in the castle creations sub-forum, but info is somewhat limited until it is released officially:

200amps continuous
6s lipo capabable
built-in CC UBEC
built-in cooling fan
Neu licensed motor design- 1550, 1700, and 2200kv ratings.

Until then, we can but dream/drool....