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 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.