At What Speeds to Aero Mods Take Effect? - Page 2 - Fuelly Forums

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Old 06-29-2006, 12:34 PM   #11
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That's true, I was overlooking that. A stiff headwind could produce the same effect as a higher speed...thanks!
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Old 06-29-2006, 01:35 PM   #12
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Quote:
Originally Posted by 95metro
That's true, I was overlooking that. A stiff headwind could produce the same effect as a higher speed...thanks!
Even stiff crosswinds getting under the car will mess up the FE. I've noticed a lot more stability in crosswinds since installing the side fairings.
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Old 06-29-2006, 02:06 PM   #13
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Originally Posted by kickflipjr
I have heard that at 35mph The engine is working more for wind resistance then tire resistance.
that depends on the setup. all my mods are for aero and none are for rolling resistance. i have a feeling that the cross over for my car is much higher. the same is probably true for the aerodynamic sports cars with really fat tires.
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Old 06-29-2006, 02:56 PM   #14
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Aerodynamic drag begins to become the dominant force to overcome on most cars between 30 mph and 40 mph.

For around town stop and go driving, liberal use of properly-executed aeromods might only improve fuel economy 1-5%. In highway driving, the effect is more profound, around 15-40%. Of course, it all depends on the car.
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Old 06-29-2006, 05:24 PM   #15
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I'd suggest taking a look at the link I suggested earlier in another thread. It's an excellent site that allows you to see what the power requirements will be at the wheels for a particular bodyshape, weight and set of tyres. After that it's up to the efficiency of the engine to produce that power.

Here are two graphs I made for a hypothetical camry sized car, keeping the same set of tyres on it. I suggest having a play, alternately setting the different coefficients to zero to see the raw effect of the other on the power required at the wheels.

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