WHAT DO YOU GUYS USE TO TEST ON A TURBO DYNO FOR STOCK? :wave:

Amps! (that's what I used and anyone else I asked) :thumbsup:

What Amp Steps?

I used (along with a few others), 15, 20, 25, & 28 Amp loads. At the time, a guy wasn't really pulling 30 amps. Settled @ 28 for final load. :wave:

AMPS...and with the 4 cell and current LOW wind motors I like to use for 4 cell MOD about 4.8 volts @ 35 - 40 amps

Step 1 25 amp
Step 2 30 amp
Step 3 35 amp
the rest @ 40 ( I BURN the heck out of my motors...I hate a motor that goes away when HOT)

I also use MANUAL steps so I can let it run in longer

For 19t and Stock, I never go over 30 amps.

Use Amps! Basically like Andy, but w/ one more step... 15-20-23-25-28. You want a view of the entire power band. It will help w/ motor fine tuning. Big Jim taught me to pay attention especially to the 20 amp #'s eventhough the motors are pulling more amps on the track... Why? Don't remember!:confused:

I prefer torque steps.... if your comparing the same motors... example, Monsters... all you have to do is look at the RPM of each step to find the best motor. Now if your trying to compare a Roar Stock to a Monster then amp draw is a little easier.
Either one works fine as long as you understand how to interpret the numbers.
I believe EAM uses torque steps on his motors.

Thanks Guys!

amps
if you use this formula to find average amp draw from your run on track you can set your amp loads to the powerband around it.
1.cycle your battery pack and record runtime.
2.make a timed run 4 MIN (240 sec) 5min (300sec)
3.discharge pack record time left.
runtime-timeleft=usedtime.
used time x discharge rate/race time in seconds=avg amps used.
430-139=291x35/300=33.95
this example is for 19t
set up amp loads in steps before and after 34.

TJ- That method has been used for decades, but it is used more for battery and motor tuning... The only problem is that it is an average, as you said. It would be most accurate at a velodrome where speeds are fairly consistant. At short tracks its not as good. If you find your average discharge rate is 30A, it doesn't show the cycle that is drawn. It could be 70A out of the turn, then 20A at top speed before letting off throttle. 70A is a big difference from 30A. The Eagletree system is quite helpful and full of interesting info when dealing with this type of stuff!

Dave - You got a CE dyno?

Yep Trying To Catch You!

Dave
If It Helps I Use The Torque Settings

Thanks Alan

Dave
If It Helps I Use The Torque Settings

hey Alan...what step(torque) do you use?

Eric

why do you perfer torque to amps arent you defeating the purpose of finding the motor with better torque?

You can look at RPM load under the torque steps. I set mine 4-9 and here is an example:

Motor 1
Torque 4 20,000 RPM 50 watt
Torque 5 19,500 RPM 60 watt
Torque 6 19,000 RPM 70 watt
Torque 7 18,000 RPM 80 watt
Torque 8 17,500 RPM 90 watt
Torque 9 17,000 RPM 100 watt

Motor 2
Torque 4 20,000 RPM 50 watt
Torque 5 19,000 RPM 55 watt
Torque 6 18,000 RPM 60 watt
Torque 7 17,000 RPM 65 watt
Torque 8 16,000 RPM 70 watt
Torque 9 15,000 RPM 75 watt

Motor #1 has more torque under load because the RPM is higher. Most of the time you also will see a higher watt number if the load RPM is higher. This is just an example and does not show actual numbers from a motor.

Amp loads just show how much the motor will draw from the battery. Torque loads will show RPM drop as the car is loaded during cornering. If you run your car back to back with the above numbers, motor #1 will pull stronger through the corners because the load RPM will be higher and the car will not slow down as much.

EA is the man when it comes to testing with these dynos and has taught me a ton on what to look for. A dyno is just a reference and track performance is always the best dyno!