[E90076]

Any ideas on the average drivetrain loss and vehicle weight for a 2007 e92 step, premium, sport?

[stressdoc]

Approx. 11.6% (Dinan has good data on this)
Guess 3410 dry

[335e92tx]

Originally Posted by E90076

Any ideas on the average drivetrain loss and vehicle weight for a 2007 e92 step, premium, sport?

You mean precentage of HP loss? - Its really difficult to say bc the n54 is underated. Most 335s dyno around 275. If you figure a min of 18% loss (which is the lower end) thats 330 engine hp

Weight is around 3550 with about 1/2 tank of fuel.

[Proper Motion LLC]

Don't most automatic RWD cars lose around 20% through the drivetrain?

340HP - 20% loss = 272 RWHP
330HP - 15% loss - 270 RWHP

Curb Weight = 3582 (Not sure what options on the car)

Curb Weight includes a full galon of tank, and I think a 75KG Driver (at least in Europe, and the car is made in Europe so I dunno...)

Tank = 16 Gallons
1 Gallon of Gasoline = 6lbs

So

Curb Weight = 3580
Driver 165 lbs
Full Tank of fuel = 95lbs

3580 - 165 - 95 = 3320 Without Driver or Fuel

(But again I don't know if Curb Weight includes the 75kg driver like it might in Europe)

[deletedelete]

So does awd have more or less drivetrain loss?

[E90076]

Originally Posted by Prowess Symphony

So does awd have more or less drivetrain loss?

Thanks all. AWD typically has a bit more loss due to the fact that the power is being routed to four wheels as opposed to two. There are more parts for the power to be transferred from the engine to wheels; resulting in a greater loss.

[scheherazade]

Originally Posted by Prowess Symphony

So does awd have more or less drivetrain loss?

AWD is a mixed bag.

you may lose about 12% in RWD, and 18% in AWD...

So you have :
88% remaining that goes to the wheels
82% remaining that goes to the wheels

But if you can torque 50% more before you break traction, you still get better performance from AWD.

AWD's advantage is at low speeds when you have the torque available to break traction. At higher speeds where this isn't an issue, RWD will be better since only the drive train loss matters.

Unless you have massive power, most cars will benefit from AWD from 0-20 or so (depends on your power, though. More power = AWD helps longer.).

-scheherazade