60 mph mamba brushless setup for e-maxx, would this work?

[sleebus.jones]

Originally Posted by extremexmods

After reading the responses, I have made a major change of plans.

Now we're talkin'! :) However, I think (personally) that running 16 cells on one MM is really pushing the limits. They way to efficiency on a MM system is voltage, and yes, 16 cells is a good idea....but the reliability of the MM ESC at 16 cells is questionable. Some folks have no problem, others smoke 'em. I think it's just the luck of the draw and manufacturing variances. I'd go for a purpose-built ESC at that point (Quark).

I'm not too sure about the 8XL either. I don't think I'd go lower than a 9XL, and I'd most likely use a 10XL. Generally the larger the truck, the lower KV you want. You gain speed by gearing it up and adding voltage. You are already past the limit on voltage, so your only solution is gearing. This is why a different ESC is needed. Getting to 60 MPH takes a LOT of power, and I'm not sure if the MM will deliver reliably for you.

Sleeb

[extremexmods]

Would the Warrior 9920 work or would I need the Warrior 12020. Where can I get them and how much do they cost?

[Finnster]

Originally Posted by extremexmods

After reading the responses, I have made a major change of plans. I will be doing a single brushless system. I will be using the fastlane machine chassis with 16 cells (2 8 cell flat packs in side by side format). I will use the wanderer 8XL. I would still like to use the mamba maxx esc. I also would like to use the supermaxx differentials. Will these differentials work with the fastlane machine chassis and the driveshaft it comes with?

I already did this 8mos ago w/ my BL Revo. You will get ~45mph w/ the 8XL on 16cells.

Now this is alot of power, and its very fun to drive, but if your big/only goal is to do 60, then you need to ~2x the power. On 5s Lipo/8Xl/MM i did 48-49 mph reliabiably. My conversion parts were light, but this was a stock 2.5 chassis and talons. Dropping weight I could see 50-51 I'm sure. This is the very edge of what a MM can do.

To get to 60, I would say you need ~2500+W for an avg/light Maxx. My 5S setup was ~1800W realisticially. As speed goes up, each increase in power shows diminishing results.

You will need an expensive drivetrain to do this as well. G/l trying to keep the front down. The MM cannot provide enough power unless you get your truck to insanely light weight (~7.5 or less I would think, but just a guess.)

[Finnster]

An MGM/Neu may do it. I would try to run as much voltage as possible with a low kv motor and gear tall.

This is not a budget project btw. Face up to spending the $$, or realign your goals w/ your budget.

Making a 60mph truck does not make sense for bashing either. Dragsters do not make good daily drivers. Low 40s is plenty for bashing. Trust us, we've done it, we know. I barely even run my 5S batts, and that's only on the street for speed runs. Even 35 is fast on rough bashing sites like contruction lots.

[extremexmods]

Johnnymaxxima used 2 7XL motors on 5s lipo to each. Would the same motors with 16 cells to each, full metal transmission, supermaxx differentials, and MIP cvds geared 24/51 be a setup to reach 60? I really do not have the money to get lithium. Is the extended center driveshaft that comes with the Fastlane Machine chassis compatible with supermaxx differentials?

With the 8XL, you might just want to try starting off with 14 cells. That's about the equivalent of 4S lipo. You're going to be surprised with the performance.

On another note, I can understand your caution when it comes to using lithium polymer. It can be intimidating. You could look to the A123 cells, which are readily available in dewalt 36v battery packs. You get 10 cells in a pack and that would make for a nice 5S2P setup. With a lipodapter, you could use a plain old nimh charger to charge the pack. The A123s won't explode or catch fire like lipo will, but are capable of amazing current levels and with the right charging setup, will charge in about 15 minutes or so.

[Serum]

I used the 9920 on my 8XL/16 cells powered savage. I did use a fan on it though.

[extremexmods]

Sounds like the 12020 is better. Can someone tell me where to get one and how much. I would have liked to buy one here but they are not sold here anymore.

[Serum]

It's not said the 12020 will be cooler than the 9920!

[extremexmods]

I just saw the MGM 16016 (160 amps, 16 cells). Is this a good speed control for my application? Also, if I used the heatsink motor clamp, would I be able to use the 7XL and 16 cells? Assuming the same max rpm as the feigao (50,000 rpm), and a kv rating of 2145 rpm, it should handle just under 24 volts. 16 cells is 19.2 volts. I have heard people used this with 5 series lipo.

[sleebus.jones]

The Feigao/wanderer series are most happy (cool temps) around 35,000 rpm. With that voltage, a 9XL would be a better choice. In another thread, MGM is coming out with some very nice new ESC's, so it might be wise to wait for those. :)

Sleeb

[Serum]

What experience have you got with brushless?

[ClodMaxx]

xmods, what you're stating with a dual system with 32 cells (not to mention the supermaxx diffs) sounds expensive and heavy, and not efficient. if you're dropping that kind of change, i'd take the suggestions/advice offered and go with a single, good system.

i would also go with supermaxx cvds and not MIP. they're only $10 more a set, but are much more durable.

[What's_nitro?]

Dude, your talking FIVE AND A HALF POUNDS of batteries including bars, and solder. All in all probably TEN POUNDS of truck or more. I don't think you'll see more than 45 Mph with any motor that will actually fit in there.

[Serum]

Nope, one single setup is the way to go; but i think he has got no idea what power is waiting.. :)

Here is what lightweight does with 5S of poor quality lipo's. Good lipo's will give you about 20-25 percent more power..;
http://rc.stuurmijmail.nl/flicks/emaxx%205S.wmv