Question on the 0-60 times...

[rainman128]

I have a question on the 0-60 times on the 128i. BMW has released as we know that the 0-60 on an automatic is approx. 6.7 seconds...and on the manuel its approx. 6.1 secs...I was wondering if you could kick it into sports drive, work with the paddles on an automatic and still hit the 6.1 time? (Also, why does the 135i have such a small difference between the auto and the manuel (turbo?))


Thanks.

Andy

[SlickShift]

It's due to the superior GM automatic tranny that BMW pairs with the twin-turbo engine.

[john970]

Interesting, didn't notice that. Also notice the 128 has a coefficient of drag of .31 compared to .33 of the 135.

Just looked up the model T ford - .8!

[AwesomeBMW]

Automatics have a higher horsepower loss through the drivetrain due t the torque converter. It loses the about the same percentage no matter the engine its paired with. In the case of the 128i, so many percent of 230 hp will be a more noticeable difference than so many percent of 300.

[john970]

Originally Posted by AwesomeBMW

Automatics have a higher horsepower loss through the drivetrain due t the torque converter. It loses the about the same percentage no matter the engine its paired with. In the case of the 128i, so many percent of 230 hp will be a more noticeable difference than so many percent of 300.

Not true if you are asking me... different tranny in the 135i.

[AwesomeBMW]

Originally Posted by john970

Not true if you are asking me... different tranny in the 135i.

That is true...The concept was that autos steal a higher percentage of the engine's hp through drivetrain loss as opposed to their manual counterparts

[john970]

Originally Posted by AwesomeBMW

That is true...The concept was that autos steal a higher percentage of the engine's hp through drivetrain loss as opposed to their manual counterparts

A locking torque converter will never be 100% efficient, but the power loss on the newer high performance auto trannies is way less than it used to be. What I meant was the same trannie will not produce a .6s difference on one car and a .1 difference on another.

Also, the torque produced by the 135 would probably necessitate a new trannie in any event.

[AwesomeBMW]

Originally Posted by john970

A locking torque converter will never be 100% efficient, but the power loss on the newer high performance auto trannies is way less than it used to be. What I meant was the same trannie will not produce a .6s difference on one car and a .1 difference on another.

Also, the torque produced by the 135 would probably necessitate a new trannie in any event.

Ahh. Never really read the original post too well. I assumed you wanted to know why autos were slightly slower. Didn't realize its .6s for the 128i. As for the reason to that, I have no clue. Maybe a typo? Their website seems to have alot of those

[Swift135]

Originally Posted by john970

Interesting, didn't notice that. Also notice the 128 has a coefficient of drag of .31 compared to .33 of the 135.

Just looked up the model T ford - .8!

More air spoilers= more down force= higher drag coefficient= improved handling (within reason).

[rainman128]

Didn't realize its .6s for the 128i. As for the reason to that, I have no clue. Maybe a typo? Their website seems to have alot of those

I guess only time will tell :-/