Last post on Aug 29, 2007 at 4:41 PM
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Volvo V70, Automotive News, Wagon
#13 of 17 European metric formula for instaneous power
Aug 01, 2007 (7:53 pm)
In European units the formula for estimating the power in kilowatts being produced by the engine when the vehicle is going a given speed and the computer shows a given fuel use in L/100km is
Power in kW = (speed in km/hr)(fuel use in L/100km)(Constant)
For a gasoline engine the constant is about 0.0236 kW/L/hr, and for a diesel engine the power is about 0.0315 kW/L/hr. (If you'd rather deal with whole numbers then instead of multiplying by the constant you'd divide by 42 for the gas engine and divide by 32 for the diesel.)
1. A 2.4L 125 kW (168 hp) gasoline V70 is traveling a constant 105 km/hr and the computer (or calculations) shows the fuel use is 6.9 L/100km. What power is the engine developing?
Power = (105)(6.9)(0.0236) = 17 kW, or
Power = (105)(6.9)/42 = 17 kW
(Note 17 kW = 17 kW x 1.34hp/kW = 23 hp)
2. A 2.4L diesel V70 is traveling a constant 105 km/hr and the computer (or pump calculations) shows the fuel use is 5.2 L/100km. What power is the engine developing?
Power = (105)(5.2)(0.0315) = 17 kw, or
Power = (105)(5.2)/32 = 17 kW
#14 of 17 diesel facts
Aug 04, 2007 (3:32 am)
as some other guy was saying,fuel is sold in volumes. Consumer is interested in price per gallon and mileage, so the density of the fuel is irrelevant. the correct comparison will show the diesel being about 40% more efficient, dollars per mile.
in USA there are not so many people that had the experience of driving a modern diesel. The massive amount of torque at very low rpm makes for quick from stop acceleration and excellent in gear acceleration. The last one makes for a relaxing drive, as quite often there is no need to downshift with passing.
0-60 indeed has more to do with the engine power, however, on the street nobody-other than few lunatics- are driving '0-60 like' aka dropping the clutch at high rpm at every stop and shifting gears at redline.
I'll say that the majority keeps their engines below 3500 rpm in usual traffic and in that area range the diesels are faster that the similar horsepower gasser.
so far, the only car diesel in USA is the Mercedes 320 cdi. It has 210hp, 400 lbs of torque [more than the 55o v8!] and goes to 60 in 6.6s. the 350-gasser is just $ 1000 less and goes to 60 in 6.5. The mileage, though, is quite different:35/26 for the diesel vs 26/19.
in Europe, even where the diesel is not much cheaper than gasoline, diesel vehicles outsell the gassers...
#16 of 17 2007 V70 Odometer/Trip Computer Conflict
Aug 29, 2007 (4:37 pm)
I saw two new 2007 Volvo V70 last night. Strangely, both car have single digit total odometer mileage and double digil trip mileage. In another word, the trip mileage is higher than total mileage. This made me think of crazy things......
The dealer said it probably was due to conversion between Europe and US. Called Volvo north America and was told the following: "The trip computer may show more mileage than the odometer if the trip computer is not reset after testing from the factory during production. This is not an indication of a fault with the vehicle. The trip computer and odometer should be reset before the vehicle is delivered.
The trip computer functions independently of the vehicle's main computer and can be reset to zero at any time."
Is this true or convincing? Did anybody else have similar experience? Thanks!
#17 of 17 Re: 2007 V70 Odometer/Trip Computer Conflict [henry69]
Aug 29, 2007 (4:41 pm)
Of course I understand that trip computer can be reset to zero any time. However, I still don't understand how trip computer can register more miles than the odemeter.
Another question I have is, if somebody turns the odometer backward, will the trip computer follow......