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07-11-2013, 02:36 PM | #265 | |
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I will one up you, have you seen this?? Last edited by pkimM3r; 07-11-2013 at 02:43 PM.. |
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07-11-2013, 02:44 PM | #266 |
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I wonder if this is just ECU boost control - similar to the 1m and the IS series having an extra 7 seconds of overboost for more torque - just later in the rev band.
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07-11-2013, 02:45 PM | #267 |
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07-11-2013, 02:55 PM | #268 |
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07-11-2013, 05:19 PM | #270 | |
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Also interesting are the double "kinks" in the blue curve which is what the prior poster was referring to in describing the electrical and computer controlled stuff as a bit artificial feeling (not sure if that was the exact term he used), which is indeed apparent in this system and you would feel this for sure and it would be a bit odd.
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07-11-2013, 07:10 PM | #271 | |
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In any case the torque delay on the un assisted turbo doesn't make any sense. Lag that lasts for 4.5 seconds plus? No chance. More likely due to an uncontrolled wastegate, which starts boost leak very early, or other factors. If it is indeed a generator set, the turbo system is matched so that at full power, the flow is exactly in the center island of the flow map (maximum efficiency island). In other words a very big turbo for the application. OK for static RPM/Load generators sets, no good for dynamic engines. I am trying to find some graphs I had of Turbo response at different RPM WOT events. These clearly show high RPM response as being fractions of a second. |
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07-12-2013, 12:45 AM | #272 | |
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I sure hope we can get some sort of similar real world transient torque test from BMW M upon release of the first big "dump" of tech info on the new engine. I'm sure they have some graphs about turbo lag (or lack thereof) but they don't always have the most clear technical marketing. There will be plenty of overuse of the work "dynamic" for sure...
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