Bodykits and Aerodynamics
Here is proof that it is best to stay with the stock bodykit.
Sport Auto Magazine shows the results of the wind tunnel testing of the BMW M3 and 335i. If we look at the results, the M3's aerodynamic improvements are quite impressive:
Front Lift @ 124 mph:
335: 42 kg (93 lb)
M3: 10 kg (22 lb)
Rear Lift @ 124 mph:
335: 28 kg (62 lb)
M3: 23 kg (51 lb)
Note: these cars do not have the aerodynamic devices to actually create down force.
The M3's lower body work and front bumper contributes to lowering the front lift by 71 lbs. The rear bumper also produces such effect. As compared to the results of the Porsche 911 S and GT3 RS which needs wings, splitters, diffusers, and a whole lot more down force, the BMW is very much ahead. But BMW is cautious in giving their cars more down force because the lower it is, the more fuel efficiency is affected. If you are using your car for racing, then the fuel efficiency will not be an issue. But if you are like most BMW owners who use their cars for street driving, fuel efficiency means so much.
While the tests may be done on the 335 and M3, you can be sure that BMW does the same thing for the other models. It is always tempting to dress up the car to make it look unique and make a statement. That is well and good but if you are serious about your driving, you might want to re-consider adding that front lip or rear diffuser or some other aerodynamic parts. Except for established after-market brands like Hamann who would have done some testing, adding some 'aerodynamic' part could be suicidal. Never forget that it took a whole lot of engineers who has done all the necessary R&D to come up with the design of the car. If you think some $159.99 splitter is going to give you more downforce, think again.
posted by gabey @ Tuesday, June 29, 2010
