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BMW Bi-turbo engine
BMW would soon be releasing a bi-turbo version of their I6, that would lead to a gain of 51 HP to 306, and torque to 293 (gain of 73). The link below has additional details
http://www.topgear.com/content/news/stories/527/
This sounds so exciting!! With the new engine, I am pretty sure a 530 would feel very fast, close to a 545/550. I would think it would shave .5 from the current 0-60 number to < 6.1.
But it looks like we have to wait about an year to see this on the 5 series - long wait indeed.
Do you see any cons to BMW adopting the turbo route? Would it be as smooth as the current I6? How about turbo lag? How about relaibility? There would be more complexity in the engine which may make it less reliable in the long run.
Any idea why BMW did away with turbo engines in the 80-90s? And why are they bringing it back again? Aren't turbo engines supposed to be less reliable than their regular counterparts?
| | Reply » BMW Bi-turbo engine |
It seems that the earlier 2.7T on Audi A6 had pretty good numbers
250 hp @ 5800 rpm
258 lb-ft @ 1850 rpm
0-60 - 6.6
whereas the new A6 with 3.2 naturally aspirated engine delivers
255 hp @ 6500 rpm
243 lb-ft @ 3250 rpm
0-60 - 7.1
As you can see the torque went down, also the RPM went high and 0-60 dipped. I wonder why Audi moved from the 2.7 Bi turbo to a non-turbo 3.2 V6?
Does this indicate something about the future of BMW, 3.0 I6 -> 3.0 Bi-turbo -> ??
| | Reply » BMW Bi-turbo engine |
Quote: It seems that the earlier 2.7T on Audi A6 had pretty good numbers
250 hp @ 5800 rpm
258 lb-ft @ 1850 rpm
0-60 - 6.6
whereas the new A6 with 3.2 naturally aspirated engine delivers
255 hp @ 6500 rpm
243 lb-ft @ 3250 rpm
0-60 - 7.1
As you can see the torque went down, also the RPM went high and 0-60 dipped. I wonder why Audi moved from the 2.7 Bi turbo to a non-turbo 3.2 V6?
Does this indicate something about the future of BMW, 3.0 I6 -> 3.0 Bi-turbo -> ?? | I would imagine the 2.7-liter twin-turbo was more expensive to manufacture, and less reliable (just more moving parts, and more heat). The slight difference in displacement (only .5-liter) wouldn't offer any benefit in fuel economy either (compare that to my old Passat 1.8-liter turbo vs. the 2.8 V6 offering in the same chassis - the 1.8T did much better on the highway).
The 2.7-liter twin-turbo in the Audi was easily bumped to 300 hp with just a chip!
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BMW Bi-turbo engine