4HP 24 EH

4HP 24 EH

















4HP 22 EH transmissions were the first electronic controlled transmissions on BMW vehicles in the US market. The 1986 model year 535i, 635i and 735i vehicles where equipped with the first version control system identified as E7. Through the lifespan of the transmission two additional control systems where phased in (late E7 and E9). The 4HP 24 transmission was introduced in 1988 with the debut of the 750iL (E32).

Identical in function to the 4HP 22, the 4HP 24 was designed to handle the higher torque output of the M70 V12 engine. Components where changed and/or modified providing the higher torque rating.

System Features:
- 35 Pin Control Module
- Adaptive Hydraulic Pressure Control
- Torque Converter Lock Up Control (on/off).
- Reverse Lock out Function
- Downshift Protection
- Shift solenoid control (all freewheel shifts)
- Shift lock solenoid control
- 3 Shift programs:
- Economy
- Sport
- Manual
- Output signal generation of:
- Torque reduction during upshifts
- Torque converter lock status
- Sport mode active, request progressive throttle curve request to EML
- Failsafe Operation (Emergency Program)
- DIS/MoDiC communication for Diagnosis

Output Ratios: 1st gear 2.40:1
2nd gear 1.46:1
3rd gear 1.00:1
4th gear 0.72:1
Reverse 2.00:1