01-12-2021, 08:36 AM
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#21 (permalink)
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Toyota Highlander, front:
Interesting the Toyota Highlander continues Toyota's philosophy of the inboard hole/holes that I have on my Corolla (a completely different car, large SUV vs small economy car):
Believe just about every Toyota has these (interestingly, the Prius does not) in one form or another.
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01-12-2021, 10:50 AM
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#22 (permalink)
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Quote:
Originally Posted by woodstock74
Believe just about every Toyota has these (interestingly, the Prius does not) in one form or another.
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Had these. The new Corolla does not, Camry does not, Sienna does not, Prius, etc. (My third gen Prius had them). I was surprised to see them on the TNGA Highlander, which I think is why I took a picture!
The only other car I can think of offhand with the hole is the Chrysler Pacifica.
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01-12-2021, 02:25 PM
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#23 (permalink)
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Any theory on the function of the inboard slots? That last one isn't so much a slot as an empty frame.
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01-12-2021, 05:44 PM
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#24 (permalink)
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Quote:
Originally Posted by freebeard
Any theory on the function of the inboard slots? That last one isn't so much a slot as an empty frame.
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Providing a reliable stream of air for the brakes is as close to an answer as I've determined. Though they seem so ham-fisted. Interesting the current Toyota-crop isn't using them...
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01-15-2021, 01:30 AM
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#25 (permalink)
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I am changing the title of this thread to include all the aerodynamic modifications I make to my Camry. This will be much better than having many different threads for all the stuff I want to do. When I get around to doing some tests I will copy results to the first post.
Those holes in the Toyota wheel spats are very peculiar! If they are for brake cooling, I wish mine came with those... the PO warped one of my brake rotors.
The diversity in OE wheel spats tell me that most designs function fine. The other day I saw a Chevy Malibu that had wheel spats larger than the ones I made that span the entire width of the tires.
A future project I have been thinking of is modifying the spoiler on the Camry to be slanted downward slightly and to have a clean separation edge. This will serve to reduce the wake size (something Julian Edgar talked about in his video about the Mirage). This will be coupled with a full undertray and a rear diffuser that will be angled slightly upwards.
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01-15-2021, 01:58 AM
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#26 (permalink)
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Quote:
Originally Posted by Taylor95
A future project I have been thinking of is modifying the spoiler on the Camry to be slanted downward slightly and to have a clean separation edge. This will serve to reduce the wake size (something Julian Edgar talked about in his video about the Mirage). This will be coupled with a full undertray and a rear diffuser that will be angled slightly upwards.
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The downwards-angled spoiler extension will work in reducing wake size only if there is attached flow ahead of it. (That's certain on a hatchback roof like the Mirage; it's to be expected but not certain on a 2007 Camry.)
Also, the greater the downwards angle of the extension, the more drag created as the attached airflow wraps around this curve. Therefore, the best trade-off between reduced wake size (reducing drag) and attached airflow around the spoiler (increasing drag) can be found only through testing. For example, throttle-stop testing or mileage over a short, flat, repeatable course at the highest speed possible.
The upwards sloping diffuser will again only be effective in reducing wake size if there is a relatively smooth floor ahead of it, basically to the front of the car. In a car of that age, I'd expect that to require an undertray. Again, though, this is easy to test - pitot tube, tufting (if the car is high enough), even pressure testing.
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01-15-2021, 03:14 AM
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#27 (permalink)
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Quote:
Originally Posted by JulianEdgar
Therefore, the best trade-off between reduced wake size (reducing drag) and attached airflow around the spoiler (increasing drag) can be found only through testing. For example, throttle-stop testing or mileage over a short, flat, repeatable course at the highest speed possible.
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It would be pretty difficult to test different angles, and probably not something I am going to do because this would require a lot of quality and work to do accurately. I am sure that there is a difference between a 10 degree slope and a 15 degree slope, but not enough to make testing worth it to me.
I will likely slope the spoiler by a conservative 10 degrees, and quantify the change through testing.
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01-15-2021, 03:25 AM
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#28 (permalink)
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Quote:
Originally Posted by Taylor95
It would be pretty difficult to test different angles, and probably not something I am going to do because this would require a lot of quality and work to do accurately. I am sure that there is a difference between a 10 degree slope and a 15 degree slope, but not enough to make testing worth it to me.
I will likely slope the spoiler by a conservative 10 degrees, and quantify the change through testing.
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I'd never spend money on a spoiler without testing first. Just use plastic sheet and tape to make trial spoilers. Even without throttle stop testing, I could detect (through fuel mileage) changes in drag with different rear spoiler angles on the Roomster shown in the other thread.
(And testing is even more important if it's a lot of work to modify the existing spoiler.)
Last edited by JulianEdgar; 01-15-2021 at 03:34 AM..
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01-15-2021, 02:11 PM
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#29 (permalink)
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slotted spats
Is it a compromise for brake cooling air?
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01-15-2021, 03:07 PM
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#30 (permalink)
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I can imagine an L-shaped vortex generator directing air to the brake, ...invisibly to the naked eye.
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