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Questions tagged [efficiency]

Generally speaking, the ratio of how much work a component or apparatus does to the amount of energy or power it uses.

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24 votes
4 answers

Will engine braking damage my transmission? How can I tell?

I drive a manual transmission '08 Honda Fit. On my daily 17 mile commute to work, there are three long hills that I can coast down, each about a half mile long. Going down these hills, I've done two ...
yhw42's user avatar
  • 347
7 votes
2 answers

How much can sub-optimal octane affect efficiency or power?

Suppose a production fuel-injected engine is tuned for 93 octane fuel. As I understand it, the engine can still run on lower-octane (i.e., less knock-resistant) fuel, but it will pull timing to avoid ...
feetwet's user avatar
  • 1,199
4 votes
2 answers

Is it more efficient to drive with the windows down or the AC on?

When driving, is it more efficient (in terms of gas consumed) to use the air conditioner, or to drive with all of the windows down? While the air conditioner reduces efficiency through drag on the ...
cawwot's user avatar
  • 143
3 votes
1 answer

How can one calculate volumetric efficiency without a MAF sensor?

I am completely new in the field of OBD2 sensor; I am looking for a method (or a formula) to calculate Volumetric Efficiency of: Diesel Car Petrol Car which do not have a MAF sensor. Can anyone help ...
Soumya Sen's user avatar