Хммм…пожалуй надо прибарахлиться. (Clutch Delay Valve)

Clutch Delay Valve — сидит между основным (master) и второстепенным (slave) цилиндрами сцепления, и работает по принципу мягкого опускания диска сцепления на маховик. Результат — дерганные переключения с 1й на 2ю, как у новичка, и изнашивание диска сцепления.

Интересно, что BMW ставил эту хреновинку на Е46 М3, на 1М, но не на Е39 М5.

Думаю надо купить модифицированный клапан, а то действительно ощущения от переключения передач в Z4, особенно 1-2, неприятные. Никак не удается переключаться так, чтобы машину не дергало (в Порше — без проблем).

"The Clutch Delay Valve (CDV) is a one-way restrictor installed by the factory between the clutch slave cylinder and clutch master cylinder, as shown in Figure 1. It "delays" the engagement of the clutch, much like old record players use a damped tone-arm to gently lower the needle onto the surface of a record.

Because of this valve, no matter how quickly you lift your foot off the clutch pedal, the clutch engages the flywheel at a constant (slow) rate. In theory, it can save the driveline from shock, were an inexperienced (or immature) driver to dump the clutch. But in practice, all it does is prematurely wear out the clutch and turn experienced drivers into people who, despite years of practice, cannot shift smoothly. During parallel parking maneuvers, the delay can be infuriating, causing constant clutch slippage. And during hard acceleration, the slippage can greatly shorten the life of your clutch. During normal, sedate driving, the shift from first into second gear is often jerky, leading passengers to question your skill. As the driver, you can see your passengers' heads bobbing back and forth during every shift! Yes, in their minds, they are laughing at you."

Clutch Delay Valve — Zeckhausen