Thread: Calculating HP at the crank
View Single Post
Old 04-25-2012, 05:40 PM   #5 (permalink)
Spikuh
A True Z Fanatic
 
Spikuh's Avatar
 
Join Date: Jul 2009
Location: The Ark
Posts: 2,357
Drives: '09 370z
Rep Power: 21
Spikuh has much to be proud ofSpikuh has much to be proud ofSpikuh has much to be proud ofSpikuh has much to be proud ofSpikuh has much to be proud ofSpikuh has much to be proud ofSpikuh has much to be proud ofSpikuh has much to be proud of
Default
Quote:
Originally Posted by babbagandu View Post
Im just curious about whether there is any reason why this method isn't accurate.


Let's say you do a baseline dyno and get 270 at the wheels. The crank hp that Nissan claims for the Z is 332. So that means the crankhp/whp ratio for your car is 332/270 = 1.23

Then after all your mods let's say you dyno at 310.

Would it then be accurate to assume your new crank hp is 310x1.23 = 381.3 ?
I would think as long as the 332 number from Nissan is pretty accurate for all the engines across the board, then backing into crank hp this way should be fairly accurate. This is of course assuming you do not change dynos, weather conditions are the same/similar, etc. If you swap to a different dyno, then this method will not work at all.
Spikuh is offline   Reply With Quote