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Discussion Starter · #1 · (Edited)
...just by being 2" lower... at 75mph I was averaging 4.3mile/kWh vs usual 3.8 at that speed... I’m trying to find out if light wheels that are non-aero outweigh the difference between an aero wheel that’s heavier. Decisions decisions... I want to buy the Avanti Storms 10.9lb wheel but been reading they might each up the range more then gain...
That's about 12% more range! (from 3.8 to 4.3mi/kWh) Also better acceleration (0-60, 30-50, 50-80, quarter mile, etc.) since all or half of each of those is above 30mph where aerodynamics get increasingly important.

When I got Advanti Storms & 205s there was no measurable range difference. My route is slower though, with the highest speed limit at 50mph. That means my wheels' extra aero drag makes less difference than it would at 75, & my stop&go means their light weight gives a greater advantage.

If someone can tell us what they get at stock height at 60mph, we could compare to my stock-height 2013's power use with Advanti Storms in 205s, which now shows 11kW on the display at 60mph on a smooth, flat, dry, level, calm road.

The only other aero thread I've seen is the rear "diffuser", which is also supposed to give a substantial improvement, especially at higher speeds (where ANY aero improvement shows most).
 

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That's about 12% more range! (from 3.8 to 4.3mi/kWh) Also better acceleration (0-60, 30-50, 50-80, quarter mile, etc.) since all or half of each of those is above 30mph where aerodynamics get increasingly important.

When I got Advanti Storms & 205s there was no measurable range difference. My route is slower though, with the highest speed limit at 50mph. That means my wheels' extra aero drag makes less difference than it would at 75, & my stop&go means their light weight gives a greater advantage.

If someone can tell us what they get at stock height at 60mph, we could compare to my stock-height 2013's power use with Advanti Storms in 205s, which now shows 11kW on the display at 60mph on a smooth, flat, dry, level, calm road.

The only other aero thread I've seen is the rear "diffuser", which is also supposed to give a substantial improvement, especially at higher speeds (where ANY aero improvement shows most).
Planning on mocking up a front aero shield for my e soon, i am going to mock a template out of cardboard first and then cut one out of a sheet of 2mm thick carbon. After thats sorted working on a rear section which id think makes more of a difference since its just a hollow turbulent void area where a muffler would normally be.
 

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Discussion Starter · #4 ·
...speed vs temperature...
Thanks for reminding me, 11kW was at 75F. Actually bounced up to 12 a few times so maybe really 11.5

It seems to me that 2" of lowering is more than enough aero improvement than needed to compensate for Advanti Storms' added drag.

If I recall correctly, a rear belly pan has a similarly large effect as the 2" lowering report above.
 

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Are you both in So Cal? I'm In Temecula, I make ABS door panels for older cars for a living. If you've got a shape for flat-bottom panels, I can cut them.

I just bought my E last month and I'm busy doing Konis / Wheels / Tires/ Springs right now. A flat bottom was next. I always trade free panels for templates!
 

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Thanks for reminding me, 11kW was at 75F. Actually bounced up to 12 a few times so maybe really 11.5

It seems to me that 2" of lowering is more than enough aero improvement than needed to compensate for Advanti Storms' added drag.

If I recall correctly, a rear belly pan has a similarly large effect as the 2" lowering report above.
there are too many variables, wind speed, head wind, temperatures, cross wind, tire rolling resistance, air pressure, pavement grade, etc.
 

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Discussion Starter · #7 ·
Ya, but my point is I looked HARD for any range difference with Storms & there was none, yet you saw a 12-15% increase right away with 2" lowering, so if you now get Storms you'll almost certainly still have better range than stock.
 

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What do you need the template to be made out of? Is cardboard OK?

Are you both in So Cal? I'm In Temecula, I make ABS door panels for older cars for a living. If you've got a shape for flat-bottom panels, I can cut them.

I just bought my E last month and I'm busy doing Konis / Wheels / Tires/ Springs right now. A flat bottom was next. I always trade free panels for templates!
 

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What do you need the template to be made out of? Is cardboard OK?
I was gonna use simple fiberboard sheet from Home Depot but now thinking using clear plastic acrylic as it’s far easier to mark the cut outs and screw and bolt points when you can see right through the points.
 

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I was gonna use simple fiberboard sheet from Home Depot but now thinking using clear plastic acrylic as it’s far easier to mark the cut outs and screw and bolt points when you can see right through the points.
Sounds like a good plan. Can always paint it later, once you get it lined out and tested.
 

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Sounds like a good plan. Can always paint it later, once you get it lined out and tested.
Actually no it would be used just as a template to make the real deal I would not use acrylic for under shield.
 

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There is this:
Yea no thanks, Ive seen that one and it looks a little too homemade, it also doesn't cover the sides its wide open. Ive got a idea already drawn in my head how i want it to be like. The one im working to make will be all the way up to the rubber air dam edge to edge all the way back to the front battery section.
 

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looks a little too homemade
Agreed. With all 3 panels installed there are still gaps and it rubs/rattles a bit without modification. Still an ok product for someone like me without any equipment to raise the car and make a template. A full coverage smooth underbody would be really sharp and probably net some gains over this kit. Can't wait to see your progress.
 

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What do you need the template to be made out of? Is cardboard OK?
Yes. Cardboard works fine- most of the door panels I reproduce come to me as old soggy cardboard/ pressboard.
.dxf / .ai / vector art is even better if you do cad or art.

We're also able to have folds in the material by using half-cuts and then hand-bending. I do some headliners this way.

Vehicle Car Automotive exterior
 

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Thinking on the more general topic of drag reduction as it pertains to the wheels - why does the 500e bumper not have air curtains/wheel air intake?

The 2020 500e does this. I believe Abarths from last few years do too. If we had a way to smooth wheel turbulence wouldn’t it put less range pressure on wheel selection?
 

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Thinking on the more general topic of drag reduction as it pertains to the wheels - why does the 500e bumper not have air curtains/wheel air intake?

The 2020 500e does this. I believe Abarths from last few years do too. If we had a way to smooth wheel turbulence wouldn’t it put less range pressure on wheel selection?
Perhaps the omitted it because of the air dam comes down low and around enough to kind of cover that. You are talking about that thing that looks like a mudflap in front of the wheel of most modern cars yes? I seen most Toyota models we sell have that. At the same time I don’t think they wanted to spend anymore money on this car they could’ve gotten a lot more highway range by covering the rear muffler area in the lower engine cover but they did not do that either.
 

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You are talking about that thing that looks like a mudflap in front of the wheel of most modern cars yes?
Something more like this https://mediapool.bmwgroup.com/cach...bmw-air-curtain-technology-11-2012-2121px.jpg

If you check out the new generation it has similar openings, as do many high efficiency EVs. The idea seems to be redirect that front air around the wheels to reduce the impact of turbulence from wheels. I think Abarths have this from pictures, but I’ve not inspected one closely in person. My simpleton thought is what if you just slap on of those bumper covers on, block off the extraneous cooling and see what happens.
 

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I think the Abarth one goes to the brakes though not out the sides like that. It’s meant for brake cooling rather then aero.
 

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I think the Abarth one goes to the brakes though not out the sides like that. It’s meant for brake cooling rather then aero.
Started following to see the belly pan. Its a great idea. I live in the mid west and I’m worried about something like that catching salt and moisture thus making the car undercarriage more prone to rust.
But if I just did the rear diffuser perhaps that would be easy to unbolt at the rear and clean.

The Abarth front corner intakes go to two tiny radiators just behind each side. At the rear corners, the bumper has slit openings that channel air out of the wheel well. So cooling at the front and more for aero at rear. It also does not have a real diffuser. Something that always annoyed me. I need one for the E, if it helps efficiency.
 
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