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06-16-2012, 03:27 AM | #23 | |
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06-16-2012, 12:55 PM | #24 |
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06-16-2012, 01:19 PM | #25 | |
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http://www.e90post.com/forums/showthread.php?t=363146 |
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06-16-2012, 03:56 PM | #26 | |
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06-17-2012, 02:10 AM | #27 |
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Drives: 2011 135i, N55, 6MT, MPK
Join Date: Feb 2012
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I never said my theory was fact. I just figured I'd throw my opinion out there for ideas. I did agree with Gnip Gnop that since it is a twin scroll turbo, that could be a very good reason why it is called "twin power turbo." I just took it as: twin power turbo=turbo w/ power of 2, and figured because a lot of people think 1 turbo compared to 2 is bad...... Anyway, exactly what is a twin scroll turbo? For example the n55, it is my understanding that the exhaust manifold has the cylinders hooked up in 2 pairs of 3 going to a split wall turbine housing, instead of all 6 cylinders going to 1, preventing certain cylinders exhaust back-flows and pressure from affecting another's when they fire? I see some people saying there are two turbine blades, one for high revs and the other for low(wasn't that the function of having 2 turbos in the n54)???
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06-17-2012, 02:51 AM | #28 | |
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06-17-2012, 02:54 AM | #29 |
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Drives: 2011 135i, N55, 6MT, MPK
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Ah I see thank you for clearing that up, I was kind of on the right track, I went back and edited my post realizing I left some out while you posted yours.... Seriously though thats a nice and simple explanation that makes sense! Finally!
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06-17-2012, 02:57 AM | #30 |
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06-17-2012, 03:00 AM | #31 |
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Drives: 2011 135i, N55, 6MT, MPK
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Lol I did it again... I'm always trying to edit my post and make it nicer before someone writes back lol, I'm OCD haha. Thanks again.
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06-19-2012, 12:25 PM | #32 |
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TwinPower Turbo
BMW is applying "TwinPower Turbo" broadly. It can mean a single twin-scroll turbo for the N55 engine or twin turbos for the N63. Yes, can be confusing unless you look at the specs.
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06-19-2012, 01:46 PM | #33 |
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I just wanted to interject here about some observations I've made regarding valvetronic. I'm not sure why BMW keeps saying the the throttle plate remains in the full open position one the engine is warmed up, because it's simply not true. I hooked up a data logger to my car (2006 325i sedan N52) and logged throttle plate position, pedal position, and valvetronic angle. I drove the car for 45 min and observed the movement of each variable. I noticed that the throttle acts just like a normal throttle plate in any car. If you give it gas, it opens. If you take lift, it closes. If you don't move your foot it stays the same. It doesn't matter weather you're driving on the street or freeway, or just revving while stopped. Valvetronic also increases and decreases with pedal position. When you start the car, the throttle angle is about 10-13 degrees and then CLOSES to about 4-5 degrees for normal idle. Max angle is 81 degrees.
I also noticed something else that's interesting. The throttle plate action is heavily dampened. If you lift suddenly, the throttle and valvetronic will not close immediately, especially while cornering. When increasing the throttle quickly, there is less damping and the response is better. I'm not sure if there have been updates to the way the system functions since it the generation they installed in my car, but the way it works in my car is contrary to the way everyone has portrayed it.
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06-19-2012, 02:19 PM | #34 |
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^^^
Interesting. Perhaps the implementation is different for TwinPower, HPI applications like the N20, N55, N63tu, and N74 than it is for naturally aspirated, port injection engines such as the N42, N52, and N62. |
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06-20-2012, 12:53 AM | #35 |
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Or maybe mine's broken lol. But seriously, that may be true but BMW said almost the same thing hen they advertised my car's engine. It just seems strange maybe someone else should take a look at thier car. If you have a turbo car with valvetronic and BT tool you can pull up the actual values and log them.
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06-20-2012, 10:29 PM | #36 |
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nice
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06-22-2012, 01:43 AM | #37 | |
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