BMW unveils single turbo N55 six-cylinder engine
#1
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BMW unveils single turbo N55 six-cylinder engine
The N54 features a twin-turbocharging system, as well as direct-fuel injection and BMW’s own Valvetronic technology, and in its most potent configuration develops up to 326hp (243kW) at 5,800rpm and 332lb-ft (450Nm) of torque from as low as 1,500rpm. BMW’s new variation on the engine, labeled the N55, is based on the same basic engine block and valve system but only sports a single turbocharger. It is the world’s first engine to combine turbocharging, direct fuel injection and fully variable Valvetronic valve management developed by BMW.
http://www.motorauthority.com/bmw-un...series-gt.html
Peak output is still a healthy 306hp (225kW) at 5,800rpm and 295lb-ft (400Nm) of torque from an even lower 1,200rpm. Furthermore, the new N55 is also said to be more fuel-efficient than the N54 though no independent test results have been produced.
http://www.motorauthority.com/bmw-un...series-gt.html
Peak output is still a healthy 306hp (225kW) at 5,800rpm and 295lb-ft (400Nm) of torque from an even lower 1,200rpm. Furthermore, the new N55 is also said to be more fuel-efficient than the N54 though no independent test results have been produced.
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#8
#9
Lexus Champion
Technically the article is correct. It says this is the first engine in the world to use turbocharging, direct injection, and fully variable Valvetronic valve management developed by BMW.
If I remember correctly the N54 in my car is only fully variable on the exhaust side, whereas the second generation valvetronic adds full variability on the intake side as well (whereas on the N54 it's variable but only 2 or 3 stage)
But that's just off the top of my head. I could be remembering that backward.
If I remember correctly the N54 in my car is only fully variable on the exhaust side, whereas the second generation valvetronic adds full variability on the intake side as well (whereas on the N54 it's variable but only 2 or 3 stage)
But that's just off the top of my head. I could be remembering that backward.
#10
I say go with it. However, I am curious about turbo lag. Nevertheless, if this can produce quite a bit of power, more efficiently, and at a lower cost it should become the the new engine of the _35's. More reason to but an M or a V8 if you really want that much power.
#11
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It's discouraging to think how much these cars cost new, and that most are leasing them, and they have such a short life
#12
Lexus Champion
The fact that they achieve near peak torque at 1500 rpm tells you that lag is likely a non issue unless they can't achieve that number consistently.
The reason that was given for the twin turbos originally was the elimination of turbo lag... and the 335i has none that I can discern.
Then again with certain turbo designs, a single turbo can be just as lag-free as a more traditional twin turbo setup. My 2.0t A4 had a tad bit more lag than my 335i does, but still barely any and nothing like people are typically talking about when they complain of cars with turbo lag. The turbo cars from 10-15 years ago all had the extreme characteristic of hitting the pedal and then waiting for a second or so to get your head snapped back. It was a cool feeling but not all that practical from a throttle response or acceleration # standpoint.
#13
Technically the article is correct. It says this is the first engine in the world to use turbocharging, direct injection, and fully variable Valvetronic valve management developed by BMW.
If I remember correctly the N54 in my car is only fully variable on the exhaust side, whereas the second generation valvetronic adds full variability on the intake side as well (whereas on the N54 it's variable but only 2 or 3 stage)
But that's just off the top of my head. I could be remembering that backward.
If I remember correctly the N54 in my car is only fully variable on the exhaust side, whereas the second generation valvetronic adds full variability on the intake side as well (whereas on the N54 it's variable but only 2 or 3 stage)
But that's just off the top of my head. I could be remembering that backward.
#15
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In all seriousness, WTH happens to these cars when they hit 100k, does the cost of maintenance and upkeep get so high it's generally smarter to just get something newer, the roads are littered with old Honda's, Toyota's and Nissan's, that are not even worth what someone pays monthly on one of these BMW's
It's discouraging to think how much these cars cost new, and that most are leasing them, and they have such a short life
It's discouraging to think how much these cars cost new, and that most are leasing them, and they have such a short life