Making the Ioniq slippier

[freebeard]

The only thing I see is the tape came loose in 2 of 2 at 2 o'clock.

No contact with the tire.

[Phase]

Originally Posted by freebeard

The only thing I see is the tape came loose in 2 of 2 at 2 o'clock.

No contact with the tire.

It’s weather stripping and also helps dampen sound coming from the metal on metal vibration. They were loud before on bumpy roads and scratched the paint. I left a gap where the screws are because I may widen the holes a little but when I get around to doing nut serts and rivets

[Phase]

Well oregon skipped autumn. Went from wild fire smoke and heat waves to rain every day and snow in the mountains overnight and it’s nonstop cold rain in forecast. I’ll be taking the wheel skirts off and putting on the winter tires for snowboard season. So now I need to focus on other eco mods that are snow proof. I may put the passengers side mirror on and just keep it on. I’d only take it off on super long road trips.

Any suggestions for some eco mods that will help in rain and snow and be pretty stable? Obviously an undertray and diffuser eventually, but what else? I assume the small box cavity/separation edges? How would that affect rain and snow build up on the rear of the car?

Any type of spoiler modifications? Would really like some helpful suggestions since cold weather hurts mpg, along with driving in rain and snow, winter blend fuels, and high rolling resistance winter tires.

[Phase]

Ioniq looking more aero. No mirrors. Wheel skirts. Also put silver duct tape over the brake cooling holes on the front tires. Full grill is blocked. Mpg still wasn’t going as good as I wanted

Still need to smooth under under the car more and def get that rear diffuser made

Very tempted to do a mini boat tail

I can’t do a full boat tail that eventually pinches at the end

Could anyone give me a break down of different boat tail lengths and reduced wake sizes and how each configuration lowers the cd?

Like how much would my cd be dropped with a 2 foot long boat tail versus a fully extended one?

[freebeard]

Consider these idealized cases:

[Phase]

thanks. looks like some big jumps even with small increments. wish i could figure out some rough estimates from my ioniq.

[freebeard]

Estimates are not equal to tuft tests.

If the upstream streamlines are moving up or down instead of straight back (in or out on the top) the new construction should anticipate or control that so the streamlines separate cleanly.

Shows up mostly in the lower corners, behind the rear wheels. Morelli's FIAT had turbine wheels that fed a duct to the diffuser area. I like skegs.

[Cd]

@ Phase : No pictures ?

[aerohead]

Originally Posted by Phase

Ioniq looking more aero. No mirrors. Wheel skirts. Also put silver duct tape over the brake cooling holes on the front tires. Full grill is blocked. Mpg still wasn’t going as good as I wanted

Still need to smooth under under the car more and def get that rear diffuser made

Very tempted to do a mini boat tail

I can’t do a full boat tail that eventually pinches at the end

Could anyone give me a break down of different boat tail lengths and reduced wake sizes and how each configuration lowers the cd?

Like how much would my cd be dropped with a 2 foot long boat tail versus a fully extended one?

1) If you can reliably isolate the OEM wake perimeter, and estimate it's wake area by measuring the width, in one-inch slices, from top to bottom, this will provide your Cd 0.24 'baseline.'
2) Since drag varies linearly with wake area, any desired percentage reduction in Cd will simply be that percentage in wake area reduction.
3) If you had AUTO-CAD, different scale renderings of the wake area could be evaluated from the automatic pixel count function, provided to determine the required tail length which would produce that 'size' of wake.
4) It's 'simple, not easy.'
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5) Without CAD, you could fabricate a 'cardboard and duct tape' length of boat-tail capable of supporting attached flow, and by percentage, using either width or height, determine the 'size' of the new rear transom which would generate the desirable wake size.

[Phase]

Originally Posted by aerohead

1) If you can reliably isolate the OEM wake perimeter, and estimate it's wake area by measuring the width, in one-inch slices, from top to bottom, this will provide your Cd 0.24 'baseline.'
2) Since drag varies linearly with wake area, any desired percentage reduction in Cd will simply be that percentage in wake area reduction.
3) If you had AUTO-CAD, different scale renderings of the wake area could be evaluated from the automatic pixel count function, provided to determine the required tail length which would produce that 'size' of wake.
4) It's 'simple, not easy.'
-------------------------------------------------------------------------------------
5) Without CAD, you could fabricate a 'cardboard and duct tape' length of boat-tail capable of supporting attached flow, and by percentage, using either width or height, determine the 'size' of the new rear transom which would generate the desirable wake size.

That’s what I was going to do. I was going to do a cardboard and duct tape box cavity 2 feet extension that follows the currently rear separation angles and then see how much smaller that wake size is