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Old 07-16-2001, 01:40 PM
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I went to a auto shop today and was talking to an employee who told me that although Mercedes claims my C220 has 147HP, its actually 135HP or so. He explained why but I don't remember. Something about how or where in the car they test for HP. Anyone know? Thank you.
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Old 07-16-2001, 02:25 PM
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Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
The horsepower ratings are average for a sample of vehicles tested. Done on a chassis dyno usually, which gives the actual power applied to the road, usually less that advertised based on drive train losses and the like. But, some engines are rated directly at output from the crank with a specified load. Also the horsepower is specified at a rpm number. So, unless you drive at 4500-5500 rpm or whatever, you are usually operating at less than the advertised power rating. Actually, who cares, if you like how it feels in the seat of your pants then make believe you've got 500 hp.

[Edited by jeffsr on 07-16-2001 at 02:30 PM]
Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.
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