Halo

By the looks of it, that car on the last dyno is really gonna snap your head back at 5600 or so!

schwett

[QUOTE]Originally posted by Hybrid
[B]This is a dyno chart from a turbo charged Honda.

Steve@Evolution

Fully port and polished B18C1 head with Stock GSR cams. It flows but you might be right, the low cam lobe might not be effienciant enough. The turbo is a Precision SC61 T4 configuration. Lags pretty hard until pass 4000+ rpm but still generate a good amount of power before the full spool. Just the graph climbs up furiously. This is done on stock sleeves with JE pistons and Crower rods.
The torque is actually pretty low compare to the amount of power I'm making. Stock bore and stroke just can't make no more unless I play with aggressive timing.

Switzerland1010

So no matter what the 5252 equality seems to remain the same.

schwett

yes. it has to. per elistan's equation above, horsepower is simply a multiple of torque and engine speed divided by 5252. so at 5252 they are equal. all dynos actually measure torque and speed, then they do the math.

evo s2000

That's correct, but just remember, the scale for both Horse power and Torque has to be the same. Some people get confused about it.

MrForgetable

Learned something new today

Switzerland1010

But I thought there was only one type of Horespower measurement regardless of metric or not. I know the Speed and Torque are different because of a metric or not-metric scale, but HP is the same either way isn't it???

schwett

yes but horsepower and torque are always the same at 5252. what you're saying is slightly different, that if graphed with different scales the line will not cross at the same location graphically. the hp and lb-ft will still be the same at 5252.

wickerbill

This isn't really true. The horsepower will ALWAYS be equal to the torque at 5252 RPM's. There is no "scale" that has to be the same because there is only one formula for horsepower and it is derived from the torque generated at a specific RPM.

Now, if you're talking about the scale on a dyno chart, then yes they need to be the same if you want the torque and horsepower curves to cross at 5252, but even if the scale isn't the same it doesn't change the fact that at that RPM torque and HP are the same numbers even if the curves don't cross at that point because of a difference in scale.