What is the final drive ratio of the BMW E90?
2 Answers
The modified final drive offers two optional reduction ratios: 4.1:1 and 4.3:1, suitable for installation in BMW E90 series models. Details about the final drive ratio are as follows: After installing an enlarged final drive: The vehicle's acceleration will become more brisk. However, it should be noted that an enlarged final drive will result in higher engine RPM at the same speed and gear, potentially increasing fuel consumption during high-speed cruising. This is a trade-off that owners need to consider. Final Drive: This component connects the two rear wheels of the car. The correct technical term for the final drive is the final reduction gear. The oil used here is commonly referred to as final drive oil, which is essentially gear oil, also known as differential oil.
Hey, I've been pondering the final drive ratio of the BMW E90 for quite a while. This thing is essentially the gear ratio of the differential, which basically means how many times the wheels rotate per engine revolution. Specifically for the E90, it varies significantly: manual transmission models, like the 320i, typically range from 2.93 to 3.15, while the 330i manual can go up to 3.38, giving you lightning-fast acceleration off the line. As for the automatic versions, they generally hover around 3.23, like the 325i automatic. Why such a big difference? It's all about matching the engine type and driving habits. If you drive a manual, a higher ratio gives you thrilling acceleration but also higher fuel consumption, especially during highway cruising when the engine hums loudly—not exactly fuel-efficient. I've experienced this firsthand driving my E90 manual. Modifying the ratio can tweak performance, but remember, the factory design balances efficiency and durability, so don't go messing with it recklessly. The best way to check your ratio is to consult the owner's manual or scan the VIN for decoding to ensure accuracy.
