Need info for 80mph brushless truggy... - RC-Monster Forums

Over_revO · **Need info for 80mph brushless truggy... -** 05.30.2009, 12:37 PM

Hi guys,

im not on the forum that often since im more a nitro guy, but im slowly crossing to the dark side lol

The fact is i dont really know a lot about brushless setup and need info.

I need a setup that could handle running 80mph without overheating?

Can a Neu 1527, Castle HV 110 esc and good lipo (dunno if it can handle
12s with this setup?) do the job?

I want something ridiculous, i like the fact of having torque even if geared over 70mph but i will not do it if its gonna overheat...

My friend have the e-revo with a Neu 1515 1.5d and MMM, on 6S it go easily at 70mph but will tend to overheat when you do low speed wheelies, but it got still so much power...
Thats frustrating to have all that power but not using it all day because of overheating...

i would really want a setup that allow me to run in the 80s all day long, and keep that gearing for bashing.

Thx for any info or tips.

:)

Mike

brushlessboy16 · 05.30.2009, 12:46 PM

the 1527 will be fine with your application, the phoenix hv110 can handle 12s. You will need mechanical brakes with your setup. You might be able to get away with a low kv 1521.

Higher voltage setups prove to be naturally more efficient- so you don really NEED that big of a motor-unless your truck is going to be heavy. Also this allows you to run lighter-lower MAH packs.

A 1521 2.5d Would put you in the ball park...

BP-Revo · 05.30.2009, 12:50 PM

I think a 1527 on 12S lipo is more than enough to provide you with that, assuming you keep the rest of the truck light. 12S is a lot of battery, so you'll want as little weight as possible while maintaining a good current rating. I think 30C (or higher) batteries are a must in this case.

I will have to say, there will be very little low speed drivability, as since it is geared so high the minimum speed will have to be "that" high.

Over_revO · 12:57 PM

Thx brushlessboy, if i understand it right, i would need a motor that can handle 50W?

That would mean a 1521 2.5D
or a 1527 1Y

?
according to those spec:
http://www.neumotors.com/Site/1500_series_.html

Thx !

Over_revO · 05.30.2009, 12:57 PM

Quote:

Originally Posted by BP-Revo

I think a 1527 on 12S lipo is more than enough to provide you with that, assuming you keep the rest of the truck light. 12S is a lot of battery, so you'll want as little weight as possible while maintaining a good current rating. I think 30C (or higher) batteries are a must in this case.

I will have to say, there will be very little low speed drivability, as since it is geared so high the minimum speed will have to be "that" high.

Ok, its weird, my friend revo can backflip from a standing still and get over 70mph, but it overheat.

I really want to get 80 without any overheating.
If you guys have a setup to recommend, to keep the truck still bashable, but able to strech his leg whenever i want up to 80 mph, and if i can gear it wider to really see a top speed once in a while also, but then i would not run it all day geared for top speed... :)

thx again!

BP-Revo · 05.30.2009, 01:05 PM

I would possibly look into eliminating the center diff in place of a 2-speed.

This would pretty much ensure your truck would never overheat, since normal running would put it in gearing with a top speed of about 55/60 and when it his 2nd it'll be able to pull hard up to speed.

Over_revO · 05.30.2009, 01:11 PM

Is there any 2 speed transmission able to hold up to the power?

Most 2 speed i used couldnt handle a good modified .28 engine for extended period, cant imagine with brushless.... lol

Do you think it could handle 70mph without overheating then, i think i can live with 70mph and gear up once in while for speed... :)

Thx

brushlessboy16 · 05.30.2009, 01:19 PM

2 speeds are not worth it- they just make more rotating mass.

They are designed for a sort ratio in first gear allowing quicker acceleration with nitros- then high top speed with the taller 2nd gear.

Since Brushless motors make there power from 0rpm all the way up- these are not necessary and do more harm then good.

Over_revO · 05.30.2009, 01:21 PM

You have any suggestion as for battery/motor combo with the HV110 esc ?

i thought about the 1527, but if the 1521 can do it ill take this one..

:)

mk351e · 05.30.2009, 01:32 PM

even if you get a setup that will run safely at these speeds, it will be near impossible to keep the truck on the ground past 65 or so. That is, REAL 65mph. If it is possible, it will be by far the most difficult part of this. Once my Muggy hits about 60, it just wants to fly away! Good luck!!

brushlessboy16 · 05.30.2009, 01:46 PM

on 6s when my truggy hits around 55, it wants to become a kite..

bdebde · 05.30.2009, 03:56 PM

Although your set up can be done, it may not be ideal. Esc's like to run wide open, they will heat up more when used at part throttle all the time. As an example, my old MLST was geared for about 30 mph or so, I could drive it outside, mostly full speed, pack after pack all day long and everything was just warm. But if I ran it in the house, low speeds with lots of braking, the ESC would get very hot. I would get a set up that can do the high speeds, but change gearing as needed for where you are running (large area vs small area). You can't use 80mph top speed on a small track (or small back yard) just like a 30mph top speed wont get you down the straights fast enough on a large track (or large parking lot).

Over_revO · 05.30.2009, 04:50 PM

Ok, thx will take that into account.

:)

brushlessboy16 · 05.30.2009, 04:56 PM

Gear for 40 and you will find it to be much more usable and cheaper... plus everything will run cool.

TexasSP · 05.30.2009, 07:01 PM

I guess my question is why 80?

Do you really understand what it takes to make 80 mph and what your truck/truggy will handle like at those speeds?

Do you really understand the setup time it will take on the suspension and tires wheels to maintain those speeds? You also have to find tires that will stay together.

Most nitro trucks that claim 45+ never get above 40. The speed ratings given are on flat street conditions with the maxed out gearing and a perfect tune.

I have found most people are shocked when they see my revo going 40-43 and always think it is much faster. I have had it up above 60 and will tell you it's no picnic. You also need a nice long area to get these speeds. I have also had my new LST2 brushless conversion near 60 and it is screaming at that point.

There is a lot that goes into speed and it takes time and money to have a good reliable setup. Running the 1.5d at 70 mph and doing wheelies with it is just silly. When I want speed runs with my trucks they are geared differently than if I am running off road and/or just bashing around.