E46 Comparison
The E90 saloon is 49 mm (1.9 in) longer, 78 mm (3.1 in) wider and 9 mm (0.4 in) taller than its predecessor (E46). The wheelbase is longer by 35 mm (1.4 in). In previous 3 Series models, space for passengers and luggage were common criticisms; however, BMW made significant improvements to the poor leg and headroom in those previous models. BMW's brochure even highlights, 'Now long legs can be enjoyed even by the people who have them'. Large amounts of aluminium were used in the body work and suspension in an attempt to keep the weight close to previous models; however, the E90 weighs between 50 lb (23 kg) and 300 lb (140 kg) more than comparable older models. The N54B30 engine is all aluminium with cast-iron liners, while the N51 and N52 engines largely consist of aluminium with an outer shell of magnesium and even aluminium bolts to prevent corrosion from dissimilar metals. The cylinder sleeves in N54 are steel and have copper coating, while N52 have Alusil aluminium sleeves.
The E90 also introduced run-flat tires to the 3 Series range. Consequently, cars with run-flats are not equipped with a spare tire. While these theoretically improve performance and handling, run-flats sometimes cost more to replace and can give a harsher ride.
Read more about this topic: BMW 3 Series (E90)
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