Super!!! fast buggy setup .....
 

Im thinking im going to buy a new XRAY XB8R buggy to convert to electric. I currently run a highly modded maxx with a mgm24/160 and lehner 1950/8. And a 4s lipo brushless RC18t so like my fast trucks. im looking for some thing a bit faster. for doing speed runs.

Ill be looking at another mgm and proberbly a lehner again unless i go for a neu. Ill be running flighpower lipos, with whatever voltage i need to attain my wanted speed. No buget as such......

i want to see how far i can push this speed wise. 70 ? 80 ? mph runtime isnt to important but 15mins plus would be nice.

So what do you think i should go for battery, ESC and motor wise?

Many Thanks

I would go for the MGM 24/160 on 8S with a Neu 2215.

well put squee... :p

Thanks :D.

Ok a 2215 neu, 1y, 1.5y ect ect what do you recomend.

Rougth guess speed wise ?

I just looked on the neu motor website, thes motors are huge even compared to my 1950, this is going to need one strong motor mount.

Yea, they are huge...bout the size of a 2250 I would guess...Shoot for a motor around 1100-1200 kv.

Edit: I just looked at there site and I would go for the 1.5Y.

You might want to consider filling the center diff with something like 500,000+ weight oil, otherwise you might not have any tread left on the front tires after just one run! A Neu 21 series would be huge! When you think of it as the Neu 15 series being the size of the Lehner 19 series, the Neu 21 motors must be bigger than the Lehner 22 motors.

2215 neu is too much weight imo, I run a 2240 and MGM 24/160 on 8S on my x1-crt and it is a lot of weight, my truggy weighs 12 pounds rtr. That motor weighs more than my 2240, a 11-12 pound buggy sounds too heavy to me.

Why would a Neu 1521 not be engouh motor? I think 3000W would just about do it. :D

I think my 1512 could get my buggy over 60 if I bumped up to 5s... and certainly would on 6s. Not saying it's a good choice but I think it would do it. It runs somewhere in the 40's on 4s geared 18/46 and barely breaks a sweat. (in the street) I think I will get the gps out and try soem speed runs just so I know what it's doing now. Wish I had some taller gears though....

what about a 2230 lehner, remember this thing will be for speed runs as I already have a 1950 maxx. I draw out the sizes on the neu on paper and it made my 1950 look tiny. so I'm now thinking 22 series as this was my originally what I was thinking .

Why not run a 1950 with more voltage on it? 8s should push it pretty good.

FYI I just checked the top speed with my 1512 (1900kv) in the 1/8 buggy... 43 mph on not wuite fully charged 4s lipo. That's with 18/46 and it could pull a much higher gearing I believe if I had something to try.

6s should push it over 60 mph with this setup... need a Monster max... :)

Because he has no budget :p.

Well then you can get it to go a lot faster than that put dual jetcat p160 and use them like nitrous oxide:005:
Btw off-road trucks and buggies are a lot heaver and trying to push them that fast is going to stress a lot of things out.

lmt motors hold some real world records:027:

I think ive chose a setup, what do you think of the following

Lehner LMT 2250/10
Flightpower 4s 5000mAh X2 in 8s configeration
MGM 24/160

On 8s the motor will be running 35,046 rpm.

that would be fast... if you're not worried about the weight.. then it's all good...

If the goal is 70+mph.... IMO you should get a little higher peak rpm than 35K.

It's just a matter of gearing... gear it high enough and it will get there.

But a higher revving setup would not require as a crazy a gear ratio to hit 70+

For a basic all purpose setup I do like the 35K number though. And you CAN just gear it way up to fly, and still be able to have a good "normal" setup if you gear it for racing etc.

Here's what I'm thinking...

Example: My buggy is geared 18/46 (8.4:1 final drive ratio) which is pretty tall.. larger pinions would probably need to be custom made, and 44T is the smallest spur I know of that will work easy. I could gear it higher but not with commonly used parts.

With this 8.4:1 ratio as an example... 70mph = 42K rpm... 80mph = 48K rpm

That's an estimate based on the 43mph I got yesterday on my "26K rpm" setup.

The same #'s say a 35K setup would run 58mph with the 8.4:1 gearing. And to go faster:

80mph = 6:1 ratio (25/46 pinion/spur)

That may actually be a good setup if you can get some big pinions. Anyone know where to get some like that?.... 20-25T range?

Just a rough estimate... I havent' even checked it against my old numbers I have recorded etc or BrianG's calc...

Any one know if mike could make me some custom pinions in the 20-30 tooth range.

So what turn 2250 does every one think i should go with and an estimated speed. I was thinking 10 or the 8 but will the 8 be a little high on the rpms? any idea if im going to get 10mins plus runtime on a 5000mAh 8s setup

This type setup is not something I have done or even seen done... but an 8s setup should have crazy runtimes. (min. per mah)

I don't see how it could NOT be longer run times than our "normal" 4s setups per mah. I would get +20 minutes track time on 5000 packs... I would guess your 8s would get 20 min at least???

Probably 30+ IMO :027:

Again... just a gut feeling... but the runtime will be impressive.

8 or 10 turn ? will 8s be pushing the 8turn to far ?

I don't know the kv of the 8 turn.

The 2250/10 is 1184kv. 8s lipo... (assuming a 3.5v per cell under load) would be 28V, which is only 33K rpm. I can't imagine the 2250/8 would be out of range at 28V... what's the kv??

here's an interesting quote from a post I found at rczone... "I don't know if a car could really go much faster with that same power setup. That boat was actually flying over the water with only the prop and rudder touching the water. This means it probably has less drag than a car at comparable speed. FYI-that was using a Lehner 2250/8 using a 32.170 schultze controller (32 cell, 170 amps continuous, water cooled) This setup spun the 2" prop at 47,500 rpm, producing over 3000 watts. Still, a car could probably go pretty fast on this setup, which would probably require a custom chassis, due to the fact that he was using 32 GP3300s, instead of the AA or smaller cells that the really fast cars sometimes use. "

If you can't choose between a 8 turn and 10 turn. Why not go 9 turn? The 9
turn is rated at 1315 kv. The 8 turn is rated at 1480. The 9 t will spin at 38k on 8s at 3.7v per cell. 2250 can for all above kvs.

Mike can make you a 24T pinion I know. He made one for Captain Harlock.

Humm that’s a lot of power to push those speeds you will need a straight road or very flat footy field/golf course and steadily clime up the speed, I don’t know a lot about monster trucks running brushless but going on my touring car and aero experience that’s a lot of power you’ll have.