I want to see the most AERODYNAMIC Yaris --- Photoshop!

[XYaris]

I like the diffuser as well. Any other pics?

Also, I'd be into using one of those spoilers available for civic hatchbacks, the ones that mount just below the rear window. Would these have any aero benefits?

[CtrlAltDefeat]

Originally Posted by XYaris

I like the diffuser as well. Any other pics?

Also, I'd be into using one of those spoilers available for civic hatchbacks, the ones that mount just below the rear window. Would these have any aero benefits?

Spoilers are made to create down force by increasing drag. Spoilers will only hurt your fuel economy. (vortex generators on the other hand...)

[LtNoogie]

Originally Posted by CtrlAltDefeat

Spoilers are made to create down force by increasing drag. Spoilers will only hurt your fuel economy. (vortex generators on the other hand...)

You mean like these?

[CtrlAltDefeat]

Originally Posted by LtNoogie

You mean like these?

yea, those. I think they cause the air bubble to be lower and the air stream to adhere to it better...

[XYaris]

Originally Posted by CtrlAltDefeat

Spoilers are made to create down force by increasing drag. Spoilers will only hurt your fuel economy.

Not all spoilers create downforce. In fact many do not. Since the goal here seems to be manipulating the flow of air behind the car, like the cone shape discussed above, maybe an attachment at the mid trunk level could do that in the right way. I wish I had a wind tunnel.

[CtrlAltDefeat]

Originally Posted by XYaris

Not all spoilers create downforce. In fact many do not. Since the goal here seems to be manipulating the flow of air behind the car, like the cone shape discussed above, maybe an attachment at the mid trunk level could do that in the right way. I wish I had a wind tunnel.

ok well generally speaking, they are used to create down-force, then. (I've actually never seen one that wasn't but that doesn't mean they don't exist) I believe that any thing intruding into the air flow, will increase drag. The trick is of course to figure out a positive cumulative effect. Vortex generators increase drag locally by interfering with the flow of air where they stick into the air stream, but if the turbulence allows a smaller vacuum pocket behind the car and better over all drag then it's worth the trade-off.

[XYaris]

Originally Posted by CtrlAltDefeat

I've actually never seen one that wasn't but that doesn't mean they don't exist.

Im pretty sure the stock spoiler on the Yaris LB is non-functional, but if not, my impression is that many cars that come with spoilers (especially front wheel drive cars) have non functional/cosmetic uses only. It depends on the size and angle of the spoiler, otherwise its not creating downforce, just drag.

maybe the spoiler im referring to would create less of the aforementioned vacuum. dont know

[CtrlAltDefeat]

Originally Posted by XYaris

Im pretty sure the stock spoiler on the Yaris LB is non-functional, but if not, my impression is that many cars that come with spoilers (especially front wheel drive cars) have non functional/cosmetic uses only. It depends on the size and angle of the spoiler, otherwise its not creating downforce, just drag.

maybe the spoiler im referring to would create less of the aforementioned vacuum. dont know

Ah, nonfunctional... Well I thought you meant one made specifically to reduce over all drag. Yes, I'm sure some spoilers produce negligible down-force and mostly drag. It's easy to add a stylish looking "spoiler" but it would take some wind tunnel time (or at least a solid knowledge of aerodynamics) to set up a spoiler specifically to reduce overall drag.

[XYaris]

That's what I figured. Maybe someone will come along. I'm generally opposed to purely cosmetic mods so to justify a spoiler or front lip for that matter I'd want to have some backing.

I would still love to see some more pics and info about that diffuser...