 Transaxle Power Transfer Loss, How much loss? |
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| nick mironov |
 Aug 27 2008, 11:57 PM
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#1
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nickm  Group: Members Posts: 204 Joined: 12-June 05 From: San Francisco, CA Member No.: 4,264  |
What is the % power loss for the 901?
Does anyone have data for engine flywheel HP and rear wheel horsepower for the same size engine? The difference would be the loss of power transfer. Nick |
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| sww914 |
Aug 28 2008, 01:17 AM
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#2
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Advanced Member Group: Members Posts: 2,439 Joined: 4-June 06 Member No.: 6,146 Region Association: None |
I've heard 15% more than once. I have no facts to back it up, I'm repeating it as rumor.
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| r_towle |
Aug 28 2008, 08:29 AM
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#3
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
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I agree, industry standard of power loss from flywheel to road wheel is typically guestimated at 15%
Rich |
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| SirAndy |
Aug 28 2008, 12:09 PM
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#4
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Resident German Group: Admin Posts: 41,634 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(sww914 @ Aug 27 2008, 11:17 PM)  I've heard 15% more than once. I have no facts to back it up, I'm repeating it as rumor. (IMG:style_emoticons/default/agree.gif) same here, but no hard data to back it up ... (IMG:style_emoticons/default/santa_smiley.gif) Andy |
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| nick mironov |
Aug 28 2008, 01:30 PM
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#5
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nickm Group: Members Posts: 204 Joined: 12-June 05 From: San Francisco, CA Member No.: 4,264 |
Here is the dynamometer test for my 75 914 with an SBC 283. The tests were done this week at the Thunderhill dyno. At max rpm of about 6,250 the dynamometer showed a speed of 153 mph. On the track we got it up to about 125 mph. However, it threw a water pump belt a couple of times. I think that there is too much flex in the Renegade water pump mount, so I need to reinforce it.
At rear wheels: 263 ft-lb torque, 241 hp. Engine: Assuming a 15% loss through the transmission, the engine would have about: 302 ft-lb torque, 277 hp. Maybe more if the test was done on a motor dyno stand without water pump, alternator, and muffler. Without air filter:  With and without air filter:  Nick |
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