new brushless for stadium truck??
 

well, i will keep this one shorter since i lost my first post.
i currently have a mgm80 and a 6s motor in a highly modified t4 i use on the street only. this current setup on a 2s lipo is sending me up to 50mph with current gearing. I have a 3s that i plan on using for very short speed runs. my question is what system could i step up to that is lighter/faster/stronger and can be run on a 2s or 3s lipo pack?
thanks

In a few days, Castle Creations will be releasing their new Mamba Maxx systems. You can get one of three motors with the following kv values: 4600, 5700, and 7700. The 4600 and 5700 can run on 2s or 3s lipo, and the 7700 can use 2s with the stock bec. The 5700 on 3s and the 7700 on 2s should both be faster than your feigao 6s.

I hate to say it, but I'd really hesitate to recommend any new motors from Castle until they are actually on the market and have been proven to perform to the standards most of us expect.

The 380c 9t on 3s lipo will reach 50 mph in a t4, just like your 6s on 2s lipo, but it will spool up much much faster. The only downside is that it's picky with the gearing. Even faster is the lehner 4200, which is just as light as the 380c 9t, but costs twice as much. These motors are good if you are extremely impatient. I highly recommend that you wait for the mamba motors. That's what we've all all been waiting for for the past 2 years. The release date is suposed to be in 2 days.

They've been proven (beta testing). They exceed the standards of most for lower-cost motors.

What's the advantage then? I have heard nothing but hype of what the real advantage over something else at this point is since castle hasn't released firm specs or pricing.

Basically, these motors are more efficient than their similarly-priced counterparts. That makes them able to put out more power for the same amount of heat that they release.

I have to assume that that's in comparison to Feigao 540 and 380C motors, correct? If that's the case, will the pricing on these motors indeed be in the $65-70 range?

How does the Lehner 5300 compare to those motors you listed and his 6s as far as speed? Would it be a good upgrade or not? Thats what I've ran before but haven't run any other sensorless motor so I have nothing to compare it too. I do know its quite a bit shorter then a regular 540 so it should be lighter too.

I've heard people say to wait on those 540 Mamba motors for over a year now. I don't think there ever gonna make them.

The CC motors are 540 motors, so compared to motors like the Feigao 540s. I'm not sure on price, but it should be near that range.

you know, i am a little unsure how useful the 380 size motor would be. i mean if i have to run a 3s to get the same speed...
the 6s along with my mods will easily push 50mph is less than 200ft. i plan on measuring soon to see exactly how far is needed.

I should be able to give you some more information this weekend. I have a 380C 6L going in my T3, so I'll be able to get some temp and speed data for you.

There's no doubt that the 3s setup will get there faster than the 2s setup. Even if top speed is the same, there's a world of a difference between 2s and 3s in terms of acceleration and torque. But wait for the mamba max.

what 3s lipo are you running that fits into the battery tray of a t4?
i may consider the smaller motor, but would love to get the mamba since it is computer programable and you dont have any of the shitty radio programming like with the mgm

one more thing....anybody know a site taking pre orders for the mamba max?
that 7700 sounds just like the powerhouse i want.

I don't think any place can start taking preorders yet. The new date is the 19th - Monday.

If you want the 7700, make sure you have VERY good batteries. Anything much less, and it won't perform as well as you want it to. But just so you know, the 7700 is mainly for touring cars. It's not well suited to offroad trucks.

He's got an onroad truck so that shouldn't be a problem

yeah my t4 is onroad only and current weighs in at 2lbs 15oz with battery, body and ready to race... its just about a touring car killer.

Then go for it! What battery and battery configuration are you using?

currently i have been running a 20c 2s kokam lipo pack. i am looking to maybe upgrade the battery along with the esc and motor.i may hld off a bit long and go for the mamba rather than the 380c motor. i have a few more mechanical mods i want to do first and then will be ready for a new powerplant and about a 75mph truck (or faster)

You're going to need a more powerful battery (higher voltage) and a slower motor to even attempt 75mph. Maybe you could try the 4600 motor from CC and 4s Lipo.

well i know i need atleast a 3s lipo to get much faster, but I dont have a charger for 4s, so 3s is the limit. I have a 3s right now, it doesnt really fit the battery tray but based on the speed tests i have done with the gps, i ratio'd out the speed I should see with the 3s and even accounting in a 10% reduction for increased wind resistance, I should still see about 68mph.
i think you might be thinking of a true stadium truck and its setup. my truck is technically called a stadium truck, but its slammed and heavily modified. the drivetrain rotational mass has been reduced by about 40 grams ( i think that includes the cvds, but cant remember at the moment). the truck is lighter than a tc4 in race trim.

What size are the tires? Are the wheels lightened as well?

Based on the equation: Kinetic Energy = 1/2 x mass x velocity^2, a small difference in the speed of the vehicle requires more energy than a small difference in weight. So just getting to a high speed requires a lot of energy. BTW, power (Watts) = Energy (Joules) / time (seconds).

Also, wind resistance increases by square. You might need 5-6s lipo for 75 mph in a truck and weights to keep the front end down.

Sleepy, the kokam 3s 3200 is the same size as a regular 6 cell pack. And so is a max amps 3s 4000 pack, except it can only do 48 amp cont. Tcolesen, do you think the max amps pack would handle the 4600 kv mamba motor?

It might push the pack, especially with higher gearing. On standard gearing, I can see it working pretty decently.

P.S., that's MetalMan to you :005:

yes, the tires are lightweight and so are the foams. i will be making my own custom rims soon that will be the lightest ones out there.
the 3s i have basically sucks as it was not the size the company said it was suppose to be..couldnt send it back.
i also feel like i can get about 68-70 out of a 3s lipo. i can tell you guys dont think it is possible, but with this particular truck and its one-off design...its possible.

You're most likely going to need more than 3s to get past 55mph. 4s should take you to 60-65, and then you'd need more voltage to go faster (5s/6s).

no way...i am pulling 50 with the weight of a gps on top and that is with a
2s. I have made several mods since I did that run and would bet large sums of money that i am at 55 right now with my 2s. I will try again soon on the speed runs and see though.
heard anything about the cc release for today? I am going to go looking for it.

hey OP, have you GPS'd your ride to verify the 50mph top speed on just 7.4v? If so, how much runway does it require? thanks

Over 50 mph is impressive on 2s, if that's how fast you're actually going. Like metalman said, though, 3s will be a stretch to hit 75 mph like you want to. The faster you go, the harder it is to go even faster. I think you'll need 4s (at least) to reach over 75.

I agree. Hitting 50mph on 2s provides a 100% gaurantee to not hit 75mph on 3s. Increasing voltage by 50% would only increase speed by 50% in an ideal world.

Yup, wind resistance, more weight, ect. are all factors that would have to be figured in.

i assume you mean me sinc e i dont see anyone with that screen name.
i have gps'd mine with a garmin etrax (the yellow one) and reached 50mph with the 2s (7.4v) and did it in less than 200 feet. i dont know the exact distance, but one day i am gona chalk off the road and see, or i might wait until the parking lot is paved for the new walmart below my house and go down there and run.

yeah, OP = Original Poster. Thats cool that you hit 50mph on only 7.4v. I've been runing 8.4v (7 GP3300) on an 8s motor and could only hit 41mph (same GPS unit you have) but I'm seroiusly limited by area and radio interference. I've got about 100ft of straight road in my apartment complex but my radio range is only 50-60ft. I need to stop being lazy and switch the cheap traxxas tx and rx out and install a JR setup I have stored somewhere.

Actually, 65 mph is possible w/ 3s lipo. Here are some 60+ mph rustlers:

http://www.swami-rc.com/speedrecord.htm

As you can see one, of the rustlers did 66.6 mph only on 10 cells with the lehner basic 5300.

well quite honestly, i should be able to easily throw down 60mph when compared to a rustler. my truck is highly modified and just for street racing. its still a work in progress, but i refuse to believe that i couldnt smoke any rustler out there, of course i would prolly have to upgrade motor/esc to match, but there are very few trucks out there that are as mechanically moddified as mine.
so i will let the gps speak for me.
again, any word on the mamba max?

True, but I was referring to his original goal of at least 75 mph. ;)

i went ahead and ordered the cc7700. i cant wait until it gets here and i can run it.