How do you read Dyno results?
03-03-2008, 05:52 AM
#1
1st Gear Member
Thread Starter
Join Date: Apr 2007
Location: Honolulu, HI
Posts: 108
How do you read Dyno results?
Can someone offer a short explanation on how to read a Dyno result sheet? I've been looking at several posts, and the overall topic is Max HP and Torque.
1. Why are there two lines: one slanting up from left to right, and also one slanting down from left to right.
2. What does the dotted red line mean in the Air/Ratio graph? Is that the target air ratio?
3. Which line equates to quicker acceleration at lower RPMs? HP or Torque?
I'm most interested in evaluating CAI mods based on RPM gains in the 2000 thru 5000 RPM range of normal driving, not based on max HP or torque. Thanks.
1. Why are there two lines: one slanting up from left to right, and also one slanting down from left to right.
2. What does the dotted red line mean in the Air/Ratio graph? Is that the target air ratio?
3. Which line equates to quicker acceleration at lower RPMs? HP or Torque?
I'm most interested in evaluating CAI mods based on RPM gains in the 2000 thru 5000 RPM range of normal driving, not based on max HP or torque. Thanks.
03-03-2008, 12:21 PM
#2
4th Gear Member
Join Date: Oct 2007
Location: Harrisburg PA
Posts: 1,778
RE: How do you read Dyno results?
Here is a bit of info on the Torque/HP subject:
The line slanting up from left to right is Horsepower. The other one is Torque. There is a mathmatical relationship between Torque and HP:
HP = (Torque * RPM)/5252
This is why the lines cross at 5252 - the point where HP and Torque are equal. Torque is what you feel in the seat of your pants, it causes the feeling of acceleration. For day to day driving it is by far the more important measurement. In general you want the highest torque (most area under the curve) over the broadest RPM range possible. If you want a lengthy explanation read this: http://vettenet.org/torquehp.html
The line slanting up from left to right is Horsepower. The other one is Torque. There is a mathmatical relationship between Torque and HP:
HP = (Torque * RPM)/5252
This is why the lines cross at 5252 - the point where HP and Torque are equal. Torque is what you feel in the seat of your pants, it causes the feeling of acceleration. For day to day driving it is by far the more important measurement. In general you want the highest torque (most area under the curve) over the broadest RPM range possible. If you want a lengthy explanation read this: http://vettenet.org/torquehp.html
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