hey guy I have a 2007 bow x5 4.8 with sports package... I love the vehicle I'm just a little disappointed with the speed of it.. what can I do to make my X5 faster ? ... and will a dyne tune or performance chip give me the speed I'm looking for ?.
Not so fast, Dougie***8230;Aerodynamic drag is the largest force at speed and is proportional to V^2, so changes in speed due to power will be proportional to the square root of the change in power. The square root of the hypothetical 40 Hp increase is 6.3 in 350 Hp ~ 2% increase in speed to a first approximation.
Is the OP looking for higher top speed or just faster acceleration, i.e., fast vs quick?Chip tune works with turbos. Your N62 would require good ole tuning, meaning lighter and sharper camshafts, lighter valves etc. Still, you would gain at most 20-40hp.
Why speed is important? Where do you live?
If you like speed, 3 series is much better option. If you still want SUV, sell it, get X5 5.0i like ARD said.
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Is the OP looking for higher top speed or just faster acceleration, i.e., fast vs quick?
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:bow:Not so fast, Dougie….
Yes, aerodynamic drag force is roughly proportional to the square of velocity. But, power is force times velocity. So, the power necessary to equal aerodynamic drag force is proportional to the cube of velocity.
P2/P1 = (V2/V1)^3
So, adding 40 h.p. to a 350 h.p. engine (assuming constant power with RPM at the top speed range) capable of achieving a maximum velocity of V1, would mean...
390/350 = (V2/V1)^3
(390/350)^(1/3) = V2/V1
So, V2 (top speed with 390 h.p.) would be 1.037 V1... as a first approximation.