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08-03-2012, 06:09 AM | #23 |
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I don't know if anyone saw this but the diagram that shows the 525d and 535d turbos have them pictured as twin scroll turbos/ The turbo exhaust intake port and exhaust manifold ports are divided so doesn't that make them twin scroll turbos as that's what twin scroll turbos are? But then again the exhaust manifold is not divided for each port as twin scroll setups should be.( =Bank 1 and 3 for first scroll and bank 2 and 4 for second scroll.)
So its confusing when people say its varible turbine geometry not twin scroll but hten it is setup almost like a twin scroll excluding the manifold. |
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08-03-2012, 03:08 PM | #24 | |
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Now the issue is really with the single variable vane turbo, to which BMW also add the label of TwinPower. Another example would be in the 2.0d X1 which uses the standard N47 engine with one turbo. The BMW blurb reads, "BMW TwinPower Turbo four-cylinder in-line diesel engine" then BMW say, "Single turbo variable vane geometry". TwinPower cannot just mean twin scroll, twin turbo, dual turbo, bi-turbo or sequential turbo in this instant. So no confusion really about the turbo setup, but simply BMW speak, marketing terms, confusing the public. HighlandPete |
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08-03-2012, 03:39 PM | #25 | |
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So the dual ports I highlighted are used for the small turbo and the dual ports on the underside are both used for the bigger turbo. It is not used as you describe, one port for one turbo and the other port for the other turbo controlled with a valve. My theory still stands and I would like to know what the turbos actually are. They are sequential turbos for sure, if they are twinscroll is what makes me confused. |
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08-03-2012, 03:49 PM | #26 | |
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http://db.tt/vhRShPtA (Assuming the link works).
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08-03-2012, 04:37 PM | #27 | |
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But it isn't this setup that is questioned as to being 'TwinPower', it is the 520d which hasn't got two turbos. HighlandPete |
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08-03-2012, 04:50 PM | #28 | |
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HighlandPete |
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08-03-2012, 05:39 PM | #29 |
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08-03-2012, 05:41 PM | #30 | |
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08-04-2012, 02:47 AM | #31 | |
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And yes I don't know why the 520d has twin power written on it as it doesn't have sequential turbos or variable turbos. I think it just marketing. |
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08-04-2012, 03:27 AM | #32 | |
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I think you'll find the 520d DOES have a variable geometry turbo...
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08-04-2012, 04:01 AM | #33 | |
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The 1st stage high pressure turbo, has full exhaust flow (unregulated port) from idle. Once the turbine control valve starts opening, the exhaust gas will automatically start flowing towards the 2nd stage turbo, as it has less back pressure. Simple but effective, setting up the turbos in series. It is partly this exhaust gas flow which makes a smooth transition of the 2-stage turbo setup across the rev range. HighlandPete |
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08-09-2012, 02:56 AM | #34 | |
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