Switch-Tronic is a name for the function of manual gear shifting on Alpina cars equipped with automatic transmissions. It was registered in 1992. When the Switch-Tronic technology appeared, it became revolutionary as it was the first to offer manual control for automatic gearboxes installed on mass production vehicles. Today, the car manufacturer actively uses it on its models, as Switch-Tronic is not only about the possibility to shift gears manually, but also about special firmware adapted to engine capabilities and driver’s needs.
Operating principle
Switch-Tronic is based on the automatic transmission with a classic design that includes a torque converter and planetary gear sets. Special firmware allows the transmission to operate in several modes. By default, it is adjusted for comfortable driving. If necessary, the driver can switch to the sport mode where gears are shifted at higher RPMs and faster. The manual mode is designed for even more dynamic driving. It ensures instant gear shifting. The transmission in the manual mode can be conveniently controlled with the help of paddle shifters.
Popular transmissions with the Switch-Tronic function
| Transmission code | Manufacturer | Quantity of speeds | Max torque, N⋅m | Max engine capacity, l | Production start | Drive type | Model applications |
| 5HP18 | ZF | 5 | 310 | 3.0 | 1999 | RWD | Alpina В3 (E36) |
| 5HP30 | ZF | 5 | 560 | 6.0 | 1992 | RWD | Alpina B10 (E39) |
| 6HP26 | ZF | 6 | 600 | 6.0 | 2001 | FWD, RWD, AWD | Alpina D3 Bi-Turbo; Alpina B5 (E60) |
| 8HP70 | ZF | 8 | 750 | 6.2 | 2010 | RWD, AWD | Alpina D3 Biturbo (F30) |
Common malfunctions of transmissions with the Switch-Tronic function
| Malfunctions | Transmissions |
| Worn-out torque converter clutch results in the faulty transmission pump. | 5HP18 |
| The clutch drum bush gets damaged fast. | 5HP30; 5HP18 |
| The mechatronic unit burns out often, especially in hot weather. | 8HP70; 6HP26 |
| Due to worn-out bushes, the transmission starts vibrating and oil leaks occur. | 6HP26; 8HP70 |
| Clogged solenoids cause jerks during gear shifting. | 6HP26; 8HP70 |
| The plastic pan gets deformed and cracked. | 6HP26 |
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