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Old 05-05-2020, 04:25 PM   #251 (permalink)
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Porsche Cayenne - development of the front aero. It's pretty trick.


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Old 05-05-2020, 06:41 PM   #252 (permalink)
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I just watched it. The Concept/Implementation cross-sections were informative. There appear to be louvers in the wheelwell that flow outward in the outer well, and inward toward the centerline.

And the air curtain duct is more or less continuous width with some bellmouthing at the inlet.
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Old 05-06-2020, 12:40 AM   #253 (permalink)
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Originally Posted by freebeard View Post
I just watched it. The Concept/Implementation cross-sections were informative. There appear to be louvers in the wheelwell that flow outward in the outer well, and inward toward the centerline.
I see the outward louvres in the wheel well, but the other louvres are the shutters and intercooler core, no?

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And the air curtain duct is more or less continuous width with some bellmouthing at the inlet.
Assuming the air curtain duct remains the same height along its length (no idea if it does) the intake area is about double the exit area on the 'implementation' drawing.
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Old 05-10-2020, 03:19 AM   #254 (permalink)
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Old 05-10-2020, 03:26 AM   #255 (permalink)
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And, a repeat of another thread, but also here so we have continuity:

Throttle-stop speed testing of aerodynamic drag - a new way of testing changes in drag:



Measuring changes in car drag (ie quantifying changes in Cd):

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Old 05-10-2020, 05:15 AM   #256 (permalink)
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Julian, you should also have a look at Vekke’s approach ( a fellow forum member).

In principle it is a similar approach but he fixes the injection amount above a certain rpm and measures the max speed rpm of the vehicle. He used this technique to make engine modifications.
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Old 05-11-2020, 04:17 AM   #257 (permalink)
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Quote:
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Julian, you should also have a look at Vekke’s approach ( a fellow forum member).

In principle it is a similar approach but he fixes the injection amount above a certain rpm and measures the max speed rpm of the vehicle. He used this technique to make engine modifications.
I don't understand what is being described. Do you have a link?
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Old 05-11-2020, 04:30 AM   #258 (permalink)
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Vekke used a similar approach by checking maximum speed achievable by the vehicle. His approach was not to limit the throttle input, rather, he tuned the (VW TDI diesel) engine so that it would inject a fixed amount of fuel every time achieving fixed power from the engine.
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Old 05-11-2020, 04:38 AM   #259 (permalink)
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Quote:
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Vekke used a similar approach by checking maximum speed achievable by the vehicle. His approach was not to limit the throttle input, rather, he tuned the (VW TDI diesel) engine so that it would inject a fixed amount of fuel every time achieving fixed power from the engine.
But a fixed amount of fuel does not equal a fixed power! It closer approximates a fixed torque. But given the influence of that on the drag calculation (^2 rather than ^3), the basic approach should still be valid (on diesels anyway).

(But I am still struggling to understand how that helps on engine modifications, as you suggested.)
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Old 05-21-2020, 05:12 PM   #260 (permalink)
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