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Calculating HP

 
Old 11-27-2012, 09:35 AM
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according to the calculater my HP would be 588. I made 635 on a Dynapack so 588 to the wheels would kind of make sense?
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Old 11-27-2012, 03:11 PM
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Originally Posted by JoeyBalls View Post
according to the calculater my HP would be 588. I made 635 on a Dynapack so 588 to the wheels would kind of make sense?
Doesn't the Dynapack already measure HP at the wheels?
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Old 11-27-2012, 04:23 PM
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Originally Posted by dwight View Post
Originally Posted by JoeyBalls' timestamp='1354041319' post='22174741
according to the calculater my HP would be 588. I made 635 on a Dynapack so 588 to the wheels would kind of make sense?
Doesn't the Dynapack already measure HP at the wheels?
At the hubs, dyno dynamics does it at the wheels
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Old 11-27-2012, 04:30 PM
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If you have something to datalog with, it's basic physics:
http://www.motoiq.com/magazine_artic...-datalogs.aspx
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Old 11-27-2012, 10:31 PM
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Originally Posted by JoeyBalls View Post
Originally Posted by dwight' timestamp='1354061462' post='22175610
[quote name='JoeyBalls' timestamp='1354041319' post='22174741']
according to the calculater my HP would be 588. I made 635 on a Dynapack so 588 to the wheels would kind of make sense?
Doesn't the Dynapack already measure HP at the wheels?
At the hubs, dyno dynamics does it at the wheels
[/quote]
Do you think there would be about a 47 horsepower different if you used a conventional chassis dyno from rolling resistance of two tires? That seems a bit on the high side to me, but maybe I'm wrong.

At 2800 lbs and 100 mph, a 0.012 rolling resistance coefficient, I get 9 HP for all four tires.
http://ecomodder.com/forum/tool-aero...resistance.php

So, I'd buy a 10-15 HP difference, not 47 HP. Stock S2000s see less than a 47 HP loss between the SAE 240 HP tested at the crank.
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Old 11-28-2012, 08:54 AM
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Originally Posted by JoeyBalls View Post
according to the calculater my HP would be 588. I made 635 on a Dynapack so 588 to the wheels would kind of make sense?
That's more difference than I would expect. Not sure what tire slippage factor would be, but it does seem high. Did you get the weight right, including driver, etc?
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