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SUBJECT: Model Year '94 Drivetrain Changes
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MODELS:
E34, 36
Synthetic Rear-Axle Oil
In addition to the 7 and 8 Series vehicles as outlined in Service Information bulletin 33 01 92 (3667) dated November 1992, the 5 Series vehicles are now also using the synthetic rear-axle lubricant. Please refer to S.I. 33 01 92 (3667) dated September 1993 for complete information.
Performance Improvement to A4S 310R Transmission 318iA (SOP 1/94), 318isA (SOP 1/94), 325iA, 325isA, 325iCA, 525iA, and 525iA
Touring
For the '94 Model Year, the above models will be receiving a new version of the now familiar A4S 310R transmission. The new version incorporates lower gear ratios in first and second gear. Additionally, 2.5 liter models will have a higher stall speed torque converter (approximately 200 RPM increase). The following chart compares the new and previous versions:
1st Gear 2nd Gear 3rd Gear 4th Gear Old Ratio 2.40 1.46 1.00 0.72
New Ratio 2.86 1.62 1.00 0.72 Due to the increased spacing of first through third gears, this new version may also be
referred to as the "widespread gear ratio automatic transmission." Careful selection of gear ratios and torque converter characteristics has enhanced the low-end acceleration
performance of these vehicles without a detrimental effect on emissions or fuel economy.
Adaptive Automatic Transmission Control
530iA, 530iA Touring, and 540iA (SOP 9/93)
Adaptive transmission control has been developed to more closely match the shifting behavior of the 5-speed automatic transmission to the driver's individual style. The adaptive automatic transmission control (AGS) takes various environmental conditions into consideration (car being driven uphill/downhill, slippery road surface, etc.) as well
as an assessment of the current driving style (aggressive or economical) before signaling a gear change. By evaluation of both the current environmental conditions and driving style the AGS system ensures the appropriate response from the automatic transmission yielding the following advantages:
- fuel consumption is lower if the car is driven calmly and smoothly
- reduction in the number of gearshifts that take place
- maximize traction and stability on slippery surfaces
- improved driver convenience through the reduction of unnecessary driver
inputs (automatic program selection).
Fundamental Logic of the Adaptive Transmission Control System
- if the accelerator pedal is depressed rapidly, a downshift normally takes place
- if the accelerator pedal is released suddenly, the present gear is usually
retained
- maintaining a constant speed and accelerator pedal position will
automatically select an economy shift program after not more than 10
seconds.
AGS System Components
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