Want to make 20 minutes with truggy..
 

Currently running in my Losi 8T 2.0 4x cell 5000mah 30c lipos with Hobbywing 2000kv and getting about 12 minutes race time...gearing 45/15.
If I was to go to 5x cell 5800mah 30c with say a 1550 Tekin truggy motor would I reach 20 minutes run time?..also would I need to gear down from the 4x cell set up?..and would power be similar between the 2x setups?
Thanks.

maybe you will make it, i run the 1550 with a 5s 5000, and can make around 17 mins, power is awesome, your gearing should be about the same, i have a 16t on mine, motor likes it better than the 15t, i was thinking of grabbing a 6s 5000 so i know i can make it

Thanks..would you make it with a 6s 5000? didnt think it would give you any better run time or would you go to an even lower kv motor?..we have 20 minute mains as run with nitro so if I cant make it a battery change is needed.

6s 5000 is more total voltage so it will run longer then a 5s 5000, i would just lower the epa a bit to make around the same speed, might not be running with notros much this year so it might not matter

I'm gearing up 1T on the pinion, lowering LVC to 2.9V per cell and adjusting the ESC punch, etc. to obtain more runtime at present.

I think that with my 8T, MMM, 2200kv, Hyperion 6500mah 4S and some careful trigger finger then I will be OK for 20 minutes.....toying with the idea of trying a 1800kv Tekin or Losi motor though to see what that does.

If not the i might look at some mods that mean a battery change can be done fast in the pits during a final....

I would try the Hyperion 6500mah cells. 6s on a 1300-1500kv motor.

Also, quality product usually provide better efficiency. Don't skimp if you want it to work...

If you want long runtimes, you have to maximize efficiency. In fact whatever you want, its better to maximize efficiency therefore your motor will run as cool as possible...
Thats mean low kV and High voltage. But the power of the motor will have a role too. If the power is too low, your motor will not have its best efficiency and will heat up fast.
For example, a 2200kV Castle is for me undersized for truggy application, you need more power. Tekin truggy motors have less power than the Castle 2200kV.
==> A Castle neu 1520 would be great with 5 or 6S, a neu 1521 would be great too.

I have to agree here! The efficiency boost can also be attributed to the extra wattage these motors can put out. These motors have to work less to get the same results as the smaller 1515 series.

I have a 1521/1Y that I will be using in my LST XXL. Should move that beat quite nicely.

I got 15 min using a 4s 25c 4900 zippy in my crt. I was using a MMM & a castle 2200. I backed my epa down to 85% & still had plenty or speed & power.

Thanks guys and a lot to take in.
Looks like the Hyperion will fit in the Losi battery tray but they are tall so lucky its in a truggy.
can get the 5x cell for a reasonable price but they are very expensive compared to the ones I have got off Hobbyking..Turnigy but they only go to 5800mah.
was thinking the Tekin as they are sensored and my Hobbywing can do sensored and thought it may help on our slippery track.
if I was to go down to say a 1300 kv truggy motor..Tekin with the 5x cell 6500 mah Hyperion would I make 20 minutes and how would the power be?
Thanks.

edumacated posted up in his trials that for him, 1550 on 5s was more efficient then that, and he has tested alot of setups

Just using a low kv doesn't necessarily mean an efficient setup if you gear high to compensate for low rpm. Also, efficiency does play a role in runtime amounts, but won't get you an extra 8 minutes to reach your 20 minute goal.

In your current setup, you say you get 12 minutes on 4s 5Ah. That equates to 25A average draw and 370w average power. Of course bursts will be higher, but that's average.

To get 20 minutes without changing your gearing/speed, you would need to run 6s on a 1300kv motor using 5700mAh cells. Adding in a little extra capacity to make up for the greater battery weight, I would go with 5800mAh. That seems a bit much for just 20 minutes in a truggy. Without looking at the vehicle speed, I would suggest gearing down if you can afford a little loss in top speed. Also, change ESC settings to tame those runtime-robbing huge current bursts: high punch control, low timing, etc.

Beautifully articulated sir! Good ole' math! :party:

Higer voltage, lower kV ===> better efficiency, 6S and 1300kV !

Think I am starting to understand this now :lol:
http://forum.teamtekin.com/phpbb3/vi...hp?f=38&t=2411
this chart is great and shows average power used which Brian worked out before so I can see that I use a bit more than the average of 330 on chart on 4x cell and can see by chart how much more efficient 5 and 6 cell are and that with a few tweeks to me and ecu I need about 4200mah for 6 cell using there average..so a Turnagy 5000mah 6 cell would be fine and 5800 mah for 5x cell so a Hyperion 6500mah 5cell would also be fine..if my maths is correct..correct me if I am wrong... so have answered some of my questions:yipi:..still dont know if I will go 5 or 6 cell though:oops: