DYNO NUMBERS ????
Thread Starter
Team Owner
Joined: Sep 2003
Posts: 88,393
Likes: 2
From: eville in
DYNO NUMBERS ????
why don't they start the readings at a standardized idle (or say 1000rpm)
most sheets i see and read normaly start at 25-3000
i need low numbers, torque is the main thing i'm looking for, now :skep:
[Modified by comp, 6:52 PM 2/5/2004]
most sheets i see and read normaly start at 25-3000
i need low numbers, torque is the main thing i'm looking for, now :skep:
[Modified by comp, 6:52 PM 2/5/2004]
Drifting
Joined: Oct 2000
Posts: 1,825
Likes: 56
From: Shawano WI
Re: DYNO NUMBERS ???? (comp)
When you dyno a motor you have to work the throttle and load untill you can stabilize the motor a couple of hundred RPM below where you want to start the test at. So if you want the test to start at 1000 RPM you would have to load the motor at 800 - 900 RPM at full throttle. It is very difficult to get a motor to stabalize at those conditions without surging and bucking, which will give you false numbers. The only other alternative would be instead of doing a sweep up test (from low RPM to high RPM) is to do a sweep down test (going from high RPM to low RPM). It requires a very skilled dyno operator to do a sweep down test and get repeatable results. And I would not recommend it on anything except a motor with very good parts as a sweep down test puts extremely high stress on the motor.
A torque curve on a motor is generally very linear at low RPM so if you have the torque numbers at 2500 to 3500 RPM you can use a calulator and continue the curve to lower RPM levels.
A torque curve on a motor is generally very linear at low RPM so if you have the torque numbers at 2500 to 3500 RPM you can use a calulator and continue the curve to lower RPM levels.
