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GR86 General Topics (2nd Gen 2022+ Toyota 86) General topics for the GR86 second-gen 86


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Old 04-13-2021, 08:02 AM   #29
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Who are they trying to kid? Aero benefits? Better engine and brake cooling? Better MPG? Pfffft! They are obviously in cahoots with manufacturers of car cleaning products, car wash operators and even clothing manufacturers.

Those side vents will route slush, road salt, street grime and mud out behind the fenders and right along that nice aero(?) ridge they have grafted onto the body below the doors. It will collect all the grime and grit so it will look terrible and will ruin your slacks, dress clothes and the ladies dresses when they try to get in or out of the car.

It is brilliant! They can make some money on car sales and even more on side deals with the manufacturers who are going to benefit from cleaning products and replacement apparel.
On a curious note, I've never owned or learned much information on a vehicle with functional side vents. Does it really spray that much dirt up through the small holes? I feel that though I may have simply never noticed, I have never seen dirt splashes or anything of that sort on sides of vehicles (and I've seen plenty of functional side vent cars in my life). I have wheels that just barely squeak out past the bottom of my fenders, which creates a little dirt splashing, but even that has little build up over time.
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Old 04-13-2021, 02:01 PM   #30
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On a curious note, I've never owned or learned much information on a vehicle with functional side vents. Does it really spray that much dirt up through the small holes? I feel that though I may have simply never noticed, I have never seen dirt splashes or anything of that sort on sides of vehicles (and I've seen plenty of functional side vent cars in my life). I have wheels that just barely squeak out past the bottom of my fenders, which creates a little dirt splashing, but even that has little build up over time.
I remember reading about a guy on the internet (reach for that grain of salt) who burned up his GTR at the Tail of the Dragon, because dried leaves went in through the brake ducts and caught on the (hot) brakes.

https://jalopnik.com/leaves-may-have...smo-1820230607
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Old 04-13-2021, 08:38 PM   #31
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^ No doubt you'll be able to get aftermarket solid grommets to plug those vent holes a few weeks after the cars hit dealers.
Lol.
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Old 04-13-2021, 09:04 PM   #32
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On a curious note, I've never owned or learned much information on a vehicle with functional side vents. Does it really spray that much dirt up through the small holes? I feel that though I may have simply never noticed, I have never seen dirt splashes or anything of that sort on sides of vehicles (and I've seen plenty of functional side vent cars in my life). I have wheels that just barely squeak out past the bottom of my fenders, which creates a little dirt splashing, but even that has little build up over time.
Hopefully it does not happen to the extent that I imply in my tongue in cheek post. What actually worried me a bit more is that the holes in the fender liners may allow salt and other corrosives to get behind the fenders where they cannot be easily removed and where they can slowly eat away at the metal. It remains to be seen how the vents are engineered on the inside to prevent this.
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Old 04-13-2021, 10:30 PM   #33
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^ No doubt you'll be able to get aftermarket solid grommets to plug those vent holes a few weeks after the cars hit dealers.
Duct tape will do. It's even in the name
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Old 04-14-2021, 07:48 AM   #34
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I remember reading about a guy on the internet (reach for that grain of salt) who burned up his GTR at the Tail of the Dragon, because dried leaves went in through the brake ducts and caught on the (hot) brakes.

https://jalopnik.com/leaves-may-have...smo-1820230607
A couple things here. First of all, there doesn't seem to have been any conclusive evidence that the leaves went through the brake ducts before catching fire at the brakes. The fire was in the right rear corner of the trunk. But more importantly, aren't brake ducts very different than what my question was in reference to?

This story is very interesting, but possibly aside from this specific one, nothing like this has ever occurred due to brake ducts or side vents.
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Old 04-14-2021, 08:29 AM   #35
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Pretty certain this is a feature sparked by the Fast and the Furious movies. Those electrical things they shoot into Brian's door to short circuit the car is really tough to deal with- these vents are meant to aid in their removal by ducting air under them to force them out when moving at high speed.
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Old 04-14-2021, 08:58 AM   #36
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The size of those intakes mean a few squirrels could be saved as well!


Only on the BRZ. The GR86 is more inclined to save chipmunks.
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Old 04-14-2021, 09:02 AM   #37
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Duct tape will do. It's even in the name
Gotta be JDM YO

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Old 04-14-2021, 10:02 AM   #38
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Duct tape will do. It's even in the name
For a while. Regular duct tape will soon surrender to grit, salt, etc. thrown up from the road.
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Old 04-14-2021, 11:41 AM   #39
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I'm going to guess that they're for reducing drag and front-end lift. @ZDan might be able to shed some light on the effects of those vents.
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Old 04-20-2021, 12:47 AM   #40
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The ones in the front bumper are to create an air curtain of sort to keep air moving over the car from interacting with the rotating tire. Same as those little flaps that hang down in front of the wheel. Most new cars these days have these features to improve gas mileage.

https://media.ford.com/content/fordm...amic-drag.html
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Old 04-20-2021, 12:08 PM   #41
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Looking at how Porsche visualizes it, the intention doesn't seem to have much of anything to do with the brakes. Or at least they aren't talking about that.

Interestingly, it sounds like if you have the auto-release charger doors, the vent behind the front* wheel is blocked, possibly contributing to that model's .25 CD vs if you have the manual release charge door the vents are open and you have a .22 CD - I think. I'm not an expert here. That is just what I summize from the info I found. There could be other factors.

On the Taycan forums, at least one person is complaining about stuff getting kicked up by the tire so they want to block those rear vents.

Last edited by mazeroni; 04-20-2021 at 12:34 PM.
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Old 04-20-2021, 12:23 PM   #42
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I'm going to guess that they're for reducing drag and front-end lift. @ZDan might be able to shed some light on the effects of those vents.
Nothing specific, I have no experience modeling or testing ducts/vents like these. It does seem that the primary function, given how the front vents exit into the wheelwell area (IIRC, can't seem to find pics of this now), could be drag reduction.

Couldn't say for sure but it could be that *some* of that airflow finds its way to the brakes and/or more normalized and less turbulent airflow in the region could encourage more consistent flow through the wheels to which could give more brake cooling as a secondary effect. Track peeps who find they need more brake cooling might still want to duct the front vent outlets to the brakes...
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