doug_999

My 2000 540ia sport had lots of drag at low speeds - I just assumed it was due to the different differential. But the 545 and 550 have the same ratio right?

znod

Thanks much. For the 750i, the crudest of calculations gives: 330/360 (6) = 5.5. BMW's claim is 5.8. So, what we see is pretty much par for the course. Given the same sorts of about .3 discrepancy between BMW and the 545i, then the 550i will be exactly 5.5 - .3 = 5.2 to 60. I guess I won't do any regressions after all for 0 -60. I'll get back to you on the 1/4.
[/quote]Here's something interesting we haven't though of before. Zero to 60's for the X5 4.8 and X5 4.4 are 5.9 and 6.8--a difference of .9 in favor of the 4.8. And, the 4.8 has the higher rear end and weighs a little more. Hummm! Well, OK, then, the 550i should go to 60 in 5.2 - .9 = 4.3. So, that won't happen because that's essentially as fast as the M5 in the current test. So, I wonder what gives with the X5 figures.

JayEll

Thanks much. For the 750i, the crudest of calculations gives: 330/360 (6) = 5.5. BMW's claim is 5.8. So, what we see is pretty much par for the course. Given the same sorts of about .3 discrepancy between BMW and the 545i, then the 550i will be exactly 5.5 - .3 = 5.2 to 60. I guess I won't do any regressions after all for 0 -60. I'll get back to you on the 1/4.
[/quote]Here's something interesting we haven't though of before. Zero to 60's for the X5 4.8 and X5 4.4 are 5.9 and 6.8--a difference of .9 in favor of the 4.8. And, the 4.8 has the higher rear end and weighs a little more. Hummm! Well, OK, then, the 550i should go to 60 in 5.2 - .9 = 4.3. So, that won't happen because that's essentially as fast as the M5 in the current test. So, I wonder what gives with the X5 figures.
[/quote]


isn't the 4.4 that was in the X5 the old 4.4 though?? i maybe wrong.. but i'm sure it's the case

530iii

Thanks much. For the 750i, the crudest of calculations gives: 330/360 (6) = 5.5. BMW's claim is 5.8. So, what we see is pretty much par for the course. Given the same sorts of about .3 discrepancy between BMW and the 545i, then the 550i will be exactly 5.5 - .3 = 5.2 to 60. I guess I won't do any regressions after all for 0 -60. I'll get back to you on the 1/4.
[/quote]Here's something interesting we haven't though of before. Zero to 60's for the X5 4.8 and X5 4.4 are 5.9 and 6.8--a difference of .9 in favor of the 4.8. And, the 4.8 has the higher rear end and weighs a little more. Hummm! Well, OK, then, the 550i should go to 60 in 5.2 - .9 = 4.3. So, that won't happen because that's essentially as fast as the M5 in the current test. So, I wonder what gives with the X5 figures.












The X5 weighs a whole lot more...





[/quote]





Than the 545i...

znod

Thanks much. For the 750i, the crudest of calculations gives: 330/360 (6) = 5.5. BMW's claim is 5.8. So, what we see is pretty much par for the course. Given the same sorts of about .3 discrepancy between BMW and the 545i, then the 550i will be exactly 5.5 - .3 = 5.2 to 60. I guess I won't do any regressions after all for 0 -60. I'll get back to you on the 1/4.
[/quote]Here's something interesting we haven't though of before. Zero to 60's for the X5 4.8 and X5 4.4 are 5.9 and 6.8--a difference of .9 in favor of the 4.8. And, the 4.8 has the higher rear end and weighs a little more. Hummm! Well, OK, then, the 550i should go to 60 in 5.2 - .9 = 4.3. So, that won't happen because that's essentially as fast as the M5 in the current test. So, I wonder what gives with the X5 figures.












The X5 weighs a whole lot more...
[/quote]
[/quote]
What does it weigh a lot more than?

znod

Thanks much. For the 750i, the crudest of calculations gives: 330/360 (6) = 5.5. BMW's claim is 5.8. So, what we see is pretty much par for the course. Given the same sorts of about .3 discrepancy between BMW and the 545i, then the 550i will be exactly 5.5 - .3 = 5.2 to 60. I guess I won't do any regressions after all for 0 -60. I'll get back to you on the 1/4.
[/quote]Here's something interesting we haven't though of before. Zero to 60's for the X5 4.8 and X5 4.4 are 5.9 and 6.8--a difference of .9 in favor of the 4.8. And, the 4.8 has the higher rear end and weighs a little more. Hummm! Well, OK, then, the 550i should go to 60 in 5.2 - .9 = 4.3. So, that won't happen because that's essentially as fast as the M5 in the current test. So, I wonder what gives with the X5 figures.
[/quote]


isn't the 4.4 that was in the X5 the old 4.4 though?? i maybe wrong.. but i'm sure it's the case
[/quote]
That's a good point. I am not sure. I looked, and it is the old one. I should have know since we have a 4.4 X5. So, the HP difference is 50. Still, given the .9 sec difference, I am very glad the 545i has the new 4.4. In other words, .9 still seems like a large difference even given the old 4.4.

SergeyM

Thanks much. For the 750i, the crudest of calculations gives: 330/360 (6) = 5.5. BMW's claim is 5.8. So, what we see is pretty much par for the course. Given the same sorts of about .3 discrepancy between BMW and the 545i, then the 550i will be exactly 5.5 - .3 = 5.2 to 60. I guess I won't do any regressions after all for 0 -60. I'll get back to you on the 1/4.
[/quote]Here's something interesting we haven't though of before. Zero to 60's for the X5 4.8 and X5 4.4 are 5.9 and 6.8--a difference of .9 in favor of the 4.8. And, the 4.8 has the higher rear end and weighs a little more. Hummm! Well, OK, then, the 550i should go to 60 in 5.2 - .9 = 4.3. So, that won't happen because that's essentially as fast as the M5 in the current test. So, I wonder what gives with the X5 figures.
[/quote]


isn't the 4.4 that was in the X5 the old 4.4 though?? i maybe wrong.. but i'm sure it's the case
[/quote]
That's a good point. I am not sure. I looked, and it is the old one. I should have know since we have a 4.4 X5. So, the HP difference is 50. Still, given the .9 sec difference, I am very glad the 545i has the new 4.4. In other words, .9 still seems like a large difference even given the old 4.4.
[/quote]

2004+ X5 4.4 has the same engine as 545. It was re-tuned for less hp (315) and more low-end torque though.

znod

Thanks much. For the 750i, the crudest of calculations gives: 330/360 (6) = 5.5. BMW's claim is 5.8. So, what we see is pretty much par for the course. Given the same sorts of about .3 discrepancy between BMW and the 545i, then the 550i will be exactly 5.5 - .3 = 5.2 to 60. I guess I won't do any regressions after all for 0 -60. I'll get back to you on the 1/4.
[/quote]Here's something interesting we haven't though of before. Zero to 60's for the X5 4.8 and X5 4.4 are 5.9 and 6.8--a difference of .9 in favor of the 4.8. And, the 4.8 has the higher rear end and weighs a little more. Hummm! Well, OK, then, the 550i should go to 60 in 5.2 - .9 = 4.3. So, that won't happen because that's essentially as fast as the M5 in the current test. So, I wonder what gives with the X5 figures.
[/quote]


isn't the 4.4 that was in the X5 the old 4.4 though?? i maybe wrong.. but i'm sure it's the case
[/quote]
That's a good point. I am not sure. I looked, and it is the old one. I should have know since we have a 4.4 X5. So, the HP difference is 50. Still, given the .9 sec difference, I am very glad the 545i has the new 4.4. In other words, .9 still seems like a large difference even given the old 4.4.
[/quote]

2004+ X5 4.4 has the same engine as 545. It was re-tuned for less hp (315) and more low-end torque though.
[/quote]
You know, I think you are right, but I am not sure. I definitely have lost my mind here. The 4.8 is detuned, so to speak, only 5 HP. And, I quess the 4.4 is "detuned" by 10 HP. But, whatever, all things considered .9 is a big difference for 40 HP.

dgjk

Guys,
I hate to put a knock on all of the speed calculations, but aren't you leaving out the most important factor in 0-60 times and quarter mile times. The tires. Don't all of these cars speed depend upon traction at the beginning. These comparisons are great to compare one car to another - and I have learned a lot reading them, but the initial acceleration is based on tire grip/traction control/driving ability - not necessarily on horsepower.

znod

Not on a Steptronic or an SMG not using AA. And, our conversations assume the cars are as they come from the factory--with RFTs. They also assume implicitly the same drivers used by BMW when making its public claims about acceleration times and that the cars have Steptronics.