Brushless CRT Questions
 

Ok, I've been in and out of just about every CRT thread there is, and I still have a couple questions about a setup. So if any of you have any input, I would really appreciate it. First, I'll give you the direction I would like to go.

I want to take a CRT Pro chassis, then put in either a Neu 1515 2.5 or a Lehner 1950. I would like to use the Mamba Max on 4 or 5 cell lipos. The gearing would remain stock, unless I need to go to the LSP front and rear diffs.

So my questions are:
1) Neu or Lehner? I know, this is an old topic but hadn't seen it dealt with specifically in regards to the CRT.
2) Will the MM run cool? I live in Boise, Idaho and the summer gets pretty hot. My goal is to have a setup that will have sick performance without having sick heat issues.
3) Lipo setup? Given my parameters in #2 above, what would you guys recommend?

The bottom line is that I want a bulletproof setup that can give me crazy performance, and have nice run times. I'm willing to go with a slightly smaller lipo and get a couple of them (swap them out) for the run times though if I need to.

So, any thoughts? Thanks guys!

Oh, I guess if any of you have a swette brushless CRT for sale it would negate this whole thread. :027:

With the MM go Lehner.
yes, the MM is a cool controller
4 or 5S, depending if you want it to go fast or redicilous fast. if you take maxamps, take the 4000 in 2P or wait for the new 5000 they have coming. Perhaps they have got what it takes to drive in 1P.

First off - thanks Serum. You always have great posts, and know what you're talking about. Much appreciated.

A couple other clarifying questions for you about your response though . . . on the Lehner, which turn would you go with? I thought I would go with the 1950/6 or 1950/7. I don't think I would go with the hi amp 6, or should I?

And about the lipos . . . I want to have a single pack, and I'm thinking about getting two of them and replacing them when one goes dead. That way I don't have to wait so long to re-charge. I'm also not convinced on the Maxamps packs from my research. Right now I run Polyquest and have had good luck with them. I've also had good luck with Thunder Power. Any other suggestions for me to consider? Thanks.

Imo go with a hi-amp, they come bare so you can choose whatever plug you want to use. I run a 1950/7T hi amp on 4s and it is perfect for racing. If you want a nice controlable setup take the 7T, if you need a bit more speed 6T is the answer.

The maxamps are nice for the money, if you get 8000mah 4s2p i doubt you will have any problems. If you want a higher quality pack the flightpower 4900's are nice, although i dont think they come in single pack formation in 4s.

Where did you get your Lehner? And how long did you have to wait?

I got it off Mike, when i got it he had the 1950/7 hi-amp already in the list, so i snagged it up:) It took 4 days to get here from mike. Dont worry, im sure mike will have those 1950s in stock soon enough!

You suck. Just kidding - I just know the Lehner's are notorious for taking forever if they're not in stock.

If you want a single pack, go for enerland 4350's or 5000 cells.

The 1950/7 would be the motor of my choice.

Reason why i was suggesting the Lehner over the Neu is because some users have got issues with this motor on the MM controller.

This is how we canadians get treated for trying to help! :):005:

Nice, I'll check into that enerland pack - thanks. Nice tip on the Lehner vs Neu too. I though you were suggesting it because of the poles or something. I personally like the Lehner too. Mostly due to it's efficiency.

So, do you think I'll need a UBEC with the MM too? And would you suggest the 1950/7 hi amp too, or just the regular 1950/7? If my memory serves me correctly, the Lehners do better with hi-amp . . . ?:002:

The hi-amp motors have less ressistance compared to the regulars.
You will need a UBEC for sure, it will run alot cooler with it.

Oh, crap - you're Canadian?!!! Just kidding. You know what I'm talking about with the long wait for the Lehners too - or else you wouldn't have jumped on it when Mike had one in stock. Right? :027:

No biggie - I' have time. I might order one next week or something to get it on it's way.

Cool, thanks.

Although the UBEC is totally new to me. Have no idea what to do with it or anything. I had just heard it's needed and wanted to make sure.

Well it was about 6-8 months back when i got mine since there wasnt such a high demand on them, i still jumped when i got it, though! :)

So do you guys think I should be considering any other motor/esc combos? I would ultimately like to go with the Monster Max, but who knows when that will be out. I've heard good and bad about the BK, MGM, and Quark. The Quark was in the running for me, but I think the MM is just as good and has better programming (not a PITA like the Quark). Should I consider another esc though? And if so, would I be better off with the Neu 1515?

if you want to go Neu, the Quark would be a good controller. both motors are top-notch. i personally don't think there is a large quality difference between either the neu/quark or the lehner/mm the Neu has got holes, which allows dirt to slip in. (Mike has got this cool 7.5 dollar fix for it though) the Lehner has got rather undeep holes for screwing it onto the mount.

Both setups are great IMO.

The quark isn't a real PITA, it just takes some time before you get used to it. the mm is one of the easiest programmable escs available.

Right. Yeah, I think I'll stick with the Lehner/MM then. The motor's more, but the esc is less, so it's fairly even. I really like the Lehner motor for long term too. I've owned a Neu motor before, and they are awesome, but this time I'll go Lehner.

I had a Quark 33 before too, and the programming was a PITA when compared to the sweet Castle Link. That thing is just awesome.

Oh, one other question . . . where do I get a good UBEC? And does anyone have photos of how to install one so I can see what I'm doing? :027:

Mike has got them, don't know if they are in stock though. check the link in BrianG's signature, it has got a nice layout of how the wiring needs to be done.

I was thinking about the Quark vs. MM thing, caused by the MM/Neu issues:

1940 $285
125b $280
total $565 :eek:

MM $135
ubec $15
9XL. $90
total $240 :005:

You save enough money that you can also pick up a Neu 1515 whenever Castle has a fix for the cogging issue, which should be soon.

This makes it seem like a no-brainer when you look at the $$$

Or you could buy a MM and a 9XL, 7XL, 12L, and a 380c 7s for a 1/10 car....

or two XLs, a MM esc, and a MM 7700 system, or.... hee hee

Right. I looked at that too and it seems to make sense for me. Although I would take your second scenario and plug in the Lehner 1950/7 instead of the 9XL. Still saves me over $60 vs the Quark/Neu setup.

True dat :)

By the way, how is your CRT running these days?

I have run a 7xl Feigao, 9xl Wanderer, and now neu. If lehner is anything like the neu the extra money is def. worth it.

It's all good except for the occasional MM/Neu "two step" :005:

I haven't run it much... cold and snow is a PITA to run in... everyting gets wet, etc.

BUT I think I;m going ot try to take it out and sky it off a huge snow jump just for kicks... and if I do I will get some video!! :004:

Sweet - you'll have to get video for sure! Definitely not enough brushless CRT video online.

Hey Sower,
As you know I am working on a CRT conversion as well. I though I had my mind set on the Enerland 5s5000 pack, but I think I'm on the verge of switching to a MaxAmp 5s8000 pack. I chose a lower Kv wind (Neu in this case, but i claim no knowledge of which motor is better), with 5s over 4s. I did it because I too have hot summers and a fetish for cool gear. I figure with higher voltage I can gear down and have less current for the same power demands, and less current means less heat to dissipate. My last project I rotated through a bundle of motors trying to find the ideal, but voltage always gave me the best window to work within. Given the cost of packs, I'm going to employ the ole "it's better to have the voltage and not need it, then to need it and not have it" perspective in order to not blow 250-300$.
Also from eagletree data I am skeptical of ALL Lipo ratings. Given such, I'm thinking about choosing the 8Ah pack from Maxamp cause it fits nicely in my conversion and it actually has a lower CofG. Unfortunately, this is all a guestimation until the order comes in. Had to special order the smooth can Neu for the heat sink I posted in another thread.

Just my 2 cents.........

I went to check out the parking lot and snow bank... I was by myself and it was getting dark out, so bad for video... but I got a quick test run with a buggy. The "jump" is like 8' tall... but the snow is not as hard packed as I hoped it would be. But I got the buggy like 10' off hte top I think... so at least 15' up in the air.

So I think it's a go for some good video, maybe tomorrow :)

Yeah, I have been following your other thread. Looks great by the way. I think I'm with you logically - I'm going to go with the Lehner 1950/7 hi-amp. I would rather have too much motor than not enough.

I'll look into the Maxamps packs. I'm not down on them, I've just heard they don't perform as well as some others out there. I'm definitely cool with having more run time due to higher mah. I'll have to check the weight too to make sure the chassis stays balanced.

Dude, that sounds awesome. You have to post video when you can.

. . . the sun will come out tomorrow . . . la la la . . . :027:

If you have other lipo brands you know of that run stronger, I am all ears. IF you know of a good thread or site to visit...I'd love to find data to help pick the best pack. If I can push 1/8 truggy with a quark/neu 1515 2.5D with only 5s5000 as strongly as with an 8000 I'd ditch the 8Ah right away..don't like the weight. Just seems hard to find data on any of them and I haven't see anyone's eagletree results to show voltage stiffness under not just average but peak loads.

I just replied to your email, Cadima. If you need more specific data, please just write me back.

I have an Eagletree system coming my way. This will finally settle some arguments around my place!

Yeah, unfortunately I don't have specific data. Just the Ford vs Chevy, or "my dad can beat up your dad" arguments. Sounds like Dafni might be taking care of that though. That would be very cool.

I've heard from places like Bishop Power Products that the Apogee lipos are very strong, as well as the Thunder Power. Don't know what they compared them to though.

No, it's not a for vs chevy story; that are opinions, the difference between the cells are just stated facts; I have seen graphs here on the forum of maxamps 8K packs and enerland 4350 packs. the 4350 packs stay close to the 3.4V on a 100A load; (340W per cel with a lot of room for play)., while the maxamps packs are getting in breathing problems at 300W per cell..., so you realy need a 2P to make it work, on 2P, the 8K maxamps stay at 3.2V per cell on 100A load.

(talking about realistic RC car/truck loads, so not a continues 100A, but 'peaks'

So to keep it going with maxamps packs; get 2P, that's my advice. but on 2P they don't perform (powerwise) like the Enerland 4350's. they are rather close though.

Yes the Enerlands are superior.

But I'm assuming that we haven't seen any froum members post eagletree data from running Enerlands... and real in-car data is different than a lab test like the guys at rcgroups do with a bare cell and controlled equipment.

BTW, the Enerlands outperform the Maxamp cells on the graphs no doubt... although I have yet to see graphs of the latest Maxamps generation cells.

Personally I would rather have the 8000mah in my cars because I want the runtime for racing. There is a weight penalty... but at least they are drasticly less expensive per mah. That's the reason I'm running Maxamps.

But man, I still am wanting some of these Enerland Flightpowers :004: or the Kokams...

Yeah, it was on this forum a user posted graphs of his 4350's.. i think i even have them on my puter...

i have got a screendump of their 4900's here; these are Virusss his cells;

as you can see, at 105A load they stay at 3.54V per cell...

Impressive IMO..

Man, do I look forward to my Eagletree stuff! No more guessing.
I have plenty of different cells and motors to try.

Just from my feeling, i can tell the 3700 Enerland cells are more powerfull than Maxamps 4000 cells in 2P.... and they claim 20C too :032:

Only one way to find out! Gawd bless electronic progress.

Amen Brother Daf.. Those flightpower do look impressive, don't you agree?

Yeah, they are.

You get what you pay for, as always.

Just as I told a mate this morning: Maxamps are good for their price, can't beat their 8000 packs. They are like the daily bread and butter, whereas the FPs are the sunday steak. Now if I were rich, I'd eat steak everyday. :)