M235i ➽ 8AT or 6MT? |
View Poll Results: M235i ➽ 8AT or 6MT? | |||
8AT | 27 | 28.72% | |
6MT | 67 | 71.28% | |
Voters: 94. You may not vote on this poll |
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11-07-2013, 06:27 PM | #23 | |
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Past rides: 2022 718 Spyder, 2022 MINI JCW, 2016 981 BGTS, 2020 MINI JCW, 2017 F80, 2015 981 CS, 2014 F22 235, 2011 E82 135, 2008 E82 135, 2007 E92 328, 2007 E92 328 (My lady drives an OG M2. So does my dad)
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11-07-2013, 07:21 PM | #24 | |||
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I might be wrong bc i really do not understand the boost part ppl talk about.... Even in tuning.... |
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11-07-2013, 08:38 PM | #25 |
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The question of Boost is really not rocket science. Basically between gear changes the amount of boost or forced induction of air into the engine reduces. There are 2 reasons why this happens;
1. As you change gear you lift off the gas pedal when you depress the clutch. This in turn causes the RPM of the engine to drop rapidly as the engine is no longer connected to the gearbox and the gas pedal is at idle position. Whilst this happens the exhaust gas is greatly reduced and it is this exhaust gas that drives the Turbo Turbine that spins the Turbo Compressor that pressurises induction air into the engine (loss of boost) this can be mittigated to some degree but Rev/RPM matching, that is to hold the gas pedal at a position where the engine RPM will match the gearbox RPM. Obviously this is no standard everyday driving skill for most. The M235 ZF ruduces this in 2 ways, firstly the gear change is much quicker than a manual change especially for Mr Average. Secondly in Sport mode the ECU(engine management) will RPM match between gears. 2. One other advantage of the ZF/DCT is that RPM matching is not as important as the speed change since when the engine is under less load (engine not connected to gearbox) the exhaust gas is less and there for the Turbo Boost is also less. It's important to remember that engine RPM and Turbo RPM are completly different. Last edited by DrFranknFurter; 11-07-2013 at 09:14 PM.. Reason: Rank spelling ;-) |
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11-08-2013, 08:17 PM | #26 | |
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