Dyno cross at 5250?
#1
Dyno cross at 5250?
Do all dyno jets cross at 5250rpm? I had heard that as a mathmatical function that they all crossed at the same point. What would cause a graph to cross lower?
I got my car dynoed today and it crossed at 4600rpm.
I got my car dynoed today and it crossed at 4600rpm.
#3
Correct. It might make it easier to understand to say equal instead of cross. Even though the graphs might not cross at 5252, they will still be equivalent. Look at your graph, each side should be labled, and they will have different numbers at each labled point. Move over to 5252 on the x-axis go up until you hit the first line and check the number, being sure to use the correct side of the graph. Then go to the next line, and look at its corresponding value. It will be the same as the other one.
#4
Originally posted by FastWhiteTA
It will cross at 5252 rpm if both the TQ and HP are on the same scale on the y axis. If the scales differ, the crossing point might be different.
It will cross at 5252 rpm if both the TQ and HP are on the same scale on the y axis. If the scales differ, the crossing point might be different.
hp = tq * rpm / 5252
#5
Originally posted by Serene
Wrong. If the scales differ it still crosses at 5252rpm, changing graph scales doesn't change horsepower formulas.
hp = tq * rpm / 5252
Wrong. If the scales differ it still crosses at 5252rpm, changing graph scales doesn't change horsepower formulas.
hp = tq * rpm / 5252
The value of HP and TQ will always be the same at 5250, but depending on how it is graphed, it may not look that way at first. If the scales are different, the lines will not cross at 5250 on the X-axis. That's the problem with placing two scales on one chart.
Dan
#6
Originally posted by Serene
Wrong. If the scales differ it still crosses at 5252rpm, changing graph scales doesn't change horsepower formulas.
hp = tq * rpm / 5252
Wrong. If the scales differ it still crosses at 5252rpm, changing graph scales doesn't change horsepower formulas.
hp = tq * rpm / 5252
All three of you have been right, except for the "Wrong." statement. Reread his statement.
-brent
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