the lehner 1930 and bk9918 esc
 

Hi I've just got in recently. I own an associated t4 with a bk 9918 controller and I've just ordered the lehner 1930/5 turn motor which will be used on the truck. I just want to share the time with you guys choosing the appropriate number of cells to use with this set up: What NO. of cells do you recommend and what is the speed you think that I'm going to achieve with this set up? thanks :L:

I wouldn't go past 8/9 cells or possibly a 3 cell Lipo pack. You are going to want to run a receiver pack as well with that controller anytime you run less than 8 cells. That motor on 8 cells will take your little t4 faster than you need to go!

I thought that 11 cells was going to be perfect for the t4 since 13.2 X 4180= 55176 RPM WITH 1200 WATTS@30 AMPS WOOOOOW I wnder what is it going to be like??!!:C:

Lehner posts a 50000 rpm limit on these motors. I am sure this could be exceeded occasionally without trouble, but the cell counts I recommended keep you within this rpm range. That is a lot of cells for a t4!

Well..you're definitly right, I'll try to use 7 instead of 8 along with a receiver pack and I'll see how powerful the thing is really gonna be, but my truck is a factory team version and I already have plans to modify the thing to the point where it could tolerate such power(11-12 cells that is).

I think you could reach 50 mph pretty easily on 8 cells. Unless you drive on the street, this will be all but uncontrollable. 7 cells will be nice power and nice runtime. 8 cells will be tough to handle in the dirt.

I dont really care if the car handles pretty well or not. All I'm caring of is whether the car(t4) can achieve some insane(and I mean it) speed or not. Lehner posted in their home page that the 1930/4t HI-AMP motor was able to go 87mph on 8 cells in a 1/10 hull. I liked the idea though and went to Fine Design Marines and I've consulted Mr. Fine about using the 1930/5 on the t4 and his reply was the same as yours: To start at low voltage and up ahead, but he said that I can definitly make a speed around 80-85 mph if I'm going to go mad and all. The truck wasnt built by me to race..no, but in fact I like bashing more than racing and also the club that I go to doesn't really race off road machine, but they rather race touring cars instead since these cars' popularity has grown pretty darn big in the last few years and you know...I'm thinking about buying myself a touring car too, but later. Now I'm more conserned about cooling down my lust for speed ah..well??!!! Hey MR. Mike where is every body? I'll be more than happy if they can post their Ideas here too..dont you think so?:P:

80 - 85mph is a tall order. I have had a T2 around 65 mph and it was a handful to keep straight. 45mph seems like a hundred mph when your trying to drive it. You should get some more response later in the day. Many folks are at work now.

85mph wow!!!!
 

I hope your eye hand co-ord is better than mine, i crashed a stock emaxx and maybe 20 mph, how big is the area your trying to drive this beast, 85mph is 125 ft/second, post a vid once your done, it would be wild to see.

matt

Sure it will. Just wait and see. The problem is that I dont know how to post a video though.:W:

As soon as you get over 50 mph things get hairy . 62.5 is my record in my bandit with a lehner 5300 and 8 cells. I am shaking after every run lol.

I use at least 400-600ft of road during these runs.

So I can understand from that : the t4 can exceed 62 mph easily if it is geared properly, because the 1930/5 motor can produce almost twice the power of the Basic 5300. Maybe just maybe I can make 63-65mph with the same setup of yours, but I really wonder what would my car do if it was equipped with a 11-12 cell pack? Things will really start to look incredible.Right?;)

The motor may be capable of providing more CONTINUOS power, but likely the batteries will be the true determining factor of the actual power output. The higher end Lehner motors have more power on paper, but you likely won't notice much, if any, difference on the actual vehicle. The power is actually in the batteries. The motor is merely the vehicle that transfer this power into movement. With the same batteries and the same gearing, the basic motor of similar Kv will perform nearly identically to the high end Lehner motors in terms of actual power output (slight difference due to efficiency, etc.-but this will be minimal and not likely noticed).

Then Li-Poly will be a good choice huh?

LiPo is an excellent choice, so long as you understand and respect the power and handling requirements of these cells, including charging/discharging and the actual discharge capabilities of the batteries.