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Old 08-01-2019, 10:55 PM   #41 (permalink)
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Where are your wheel covers?

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Old 08-02-2019, 05:30 AM   #42 (permalink)
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Quote:
Originally Posted by Vman455 View Post
Earlier this spring, I noticed on an Insight that Honda had added some devices under the rear bumper cover when they refreshed it for 2012...I found them in a parts catalog--they're called "rear air splitters"--and ordered a pair. The Prius' bumper cover is slightly too short, but the locating pin at the end of the splitter still fits in a hole I drilled in the cover, so the whole thing is stable.
The 2nd gen Prius had boat tails behind the rear tires.

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Old 08-02-2019, 12:07 PM   #43 (permalink)
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Quote:
Originally Posted by mpg_numbers_guy View Post
Where are your wheel covers?
I removed them last spring in the first stages of the weight-reduction kick; all told, the pans were ~10 lbs. I might do something lightweight in the future.

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Originally Posted by Gasoline Fumes View Post
The 2nd gen Prius had boat tails behind the rear tires.

Yep, and the 3rd gen continued that with a slightly modified design:



The Insight doesn't have the raised diffuser like the Prius, so it's just a flat surface without the inside shaping like the Prius:



But I think the splitter should function the same, adding surface area for the airflow behind the tire to attach to. I inset it like on the Insight rather than making it flush with the outside of the bumper cover since there's probably a reason the engineers did that despite having all that real estate available.
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Old 08-03-2019, 09:14 AM   #44 (permalink)
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Were the rear wheel "boat tails" a removable piece or were they molded into the rear bumper/body panel?
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Old 08-03-2019, 12:51 PM   #45 (permalink)
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Were the rear wheel "boat tails" a removable piece or were they molded into the rear bumper/body panel?
On the 2nd gen? It's removable.
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Old 08-04-2019, 10:06 AM   #46 (permalink)
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Was at the salvage yard yesterday and didn't notice them on any Prius. I wonder if those could be adapted for use on other cars?
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Old 01-12-2020, 08:43 PM   #47 (permalink)
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Update:

I haven't had much time to work on the car, what with being back in school. But I wanted to get at least something done before this year's GGP. So, I thought I would try some air curtain ducts. I have the internal ducts from a Hyundai Ioniq, but rather than retrofit them I used them as a model for some (much easier to fabricate) external ducts. The Hyundai ducts are about the same size as these, ~30mm inlet, ~20mm outlet, ~150mm tall, and angled downward toward the outlet (that was a surprise). So, these are too.

Cardboard template:


Ducts in aluminum. I'm happy with how they turned out, considering I: a) have no experience working with aluminum, just tin and lead pipes (and some zinc repair); b) have no mandrels or brake.


On the car:






I don't know why the Ioniq's ducts are angled downwards, but I'm just copying for now. I'll take a close look at other air curtain ducts at the Chicago Auto Show next month to see if other manufacturers do the same.

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aero, ggp, racecar, weight reduction

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