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View Full Version : I want to see the most AERODYNAMIC Yaris --- Photoshop!


basslover911
10-18-2009, 03:13 PM
Photoshop me the most aerodynamic Yaris!

Lowered, kammback'd, boattailed, moon disc'd, rear wheel skirts, anything...

I would LOVE to see how far a Yaris can go and still look "good". I am sure a Yaris could hit at least 60mpg with some good aero mods... maybe more

talnlnky
10-18-2009, 05:03 PM
I could do 70mpg if I was allowed to go 30-35mph without stopping. No mods needed :)

basslover911
10-18-2009, 06:16 PM
Lol well yeah but I mean at normal freeway speeds (65-70mph)

talnlnky
10-19-2009, 12:53 AM
I think the best thing you could do.... for the HB at least is to give it a tail so to speak... like a cone shaped tail... the HB has sooo much drag at highway speeds.

eijikikimaru
10-19-2009, 02:07 AM
^The HB has a lot of drag? Where have you gotten this information? Could I see the article because I'm very interested.

talnlnky
10-19-2009, 11:58 AM
^The HB has a lot of drag? Where have you gotten this information? Could I see the article because I'm very interested.

look at the shape.... look at how easily the rear window gets covered in water when the road is wet... thats due to the way the car is shaped, which causes a low pressure area right behind it which is significantly bigger than the low pressure area created by the sedan.

the sedan has much better drag characteristics.

Also... if you hook up a scanguage to the HB you'll notice that anything above 50mph and your mpg's drops like a rock.... yes there is also the factor of friction with higher rpm's...however, friction isn't the only force causing mpg's to decrease so quickly at highway speeds.

Tamago
10-19-2009, 12:10 PM
Photoshop me the most aerodynamic Yaris!

http://graphics8.nytimes.com/images/2005/10/26/automobiles/26dixon1.583.jpg

damn what a chop

yarisugi
10-19-2009, 12:14 PM
Tamago, that's some amazing photochop!

Yar Is Word
10-19-2009, 01:16 PM
PRIHILYARIUS

Astroman
10-19-2009, 05:06 PM
The COD is only .29 on the yaris. pretty good.

basslover911
10-21-2009, 12:11 AM
Alright, as the OP, i guess I have to go first

This is my take on probably the most aero you could make a yaris... while still making it look good. I dont know about the kammback design though, I bet someone could make it look even "cooler" -looking and extend it a bit more...

Yar Is Word
10-21-2009, 01:34 AM
Very nice!

TLyttle
10-21-2009, 12:33 PM
Someone post a pic of the sedan, that is about as clean aerodynamically as most cars, including modified 3-doors. If this thing has a C/D of .29, I am very happy, and not in the least surprised.

basslover911
10-21-2009, 12:47 PM
Well both the sedan and hatchback have the exact same .cd of .29 soooo

They are both as slippery i suppose...

TLyttle
10-21-2009, 09:43 PM
Now, THAT is interesting, somehow seems wrong to me. Now it gets into having a wind tunnel to see where the different airflows go. Where did your C/D information come from, out of curiosity?

basslover911
10-21-2009, 10:04 PM
Anywhere its off the toyota website and any website that gives you specs on the yaris

yaris-me
10-22-2009, 01:34 AM
basslover911 that was good. Do you have that black stripe on your car? I might try to do that on mine.:w00t:

THE ONE
10-22-2009, 01:46 AM
basslover911 that was good. Do you have that black stripe on your car? I might try to do that on mine.:w00t:

You're right, the black stripe looks nice... :thumbup:

basslover911
10-22-2009, 10:48 AM
No I photoshopped it on there cuz I thought it would look good and create a break halfway down the car since the side of the yaris is Very flat on the side (boring)

Twizzstyle
10-26-2009, 09:45 PM
Not a photoshop, but real... experiment I did last spring on a 1600 mile road trip. Best tank was only 51mpg, but granted we were loaded down with a LOT of camping gear.

http://photos-f.ak.fbcdn.net/hphotos-ak-snc1/hs037.snc1/4334_746885104208_10708561_43001924_3570623_n.jpg

http://photos-g.ak.fbcdn.net/photos-ak-snc1/v3867/225/12/10708561/n10708561_43066133_7241756.jpg

http://photos-c.ak.fbcdn.net/photos-ak-snc1/v3867/225/12/10708561/n10708561_43066131_2500008.jpg

Mods included taping ALL seams, removing wipers and fairing that area, covered foglight recesses, upper grill block, moon wheel covers, removed antenna, removed sidemarkers, side mirror fairings, garage door front lip, and a functional rear diffuser :)

CtrlAltDefeat
10-26-2009, 10:12 PM
that's pretty cool. 51mpg is not bad at all with a full load of gear... Wonder what you could do for a permanent install to get similar mpg without all the tape (seals under the seams, fiber glass fairings, etc...)

slothman86
10-26-2009, 11:16 PM
that rear diffuser is awesome! How'd you do it?

XYaris
10-27-2009, 03:42 PM
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
10-27-2009, 10:05 PM
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...)

Yarold n Kumar
10-27-2009, 10:14 PM
does the egg shape cause turbulence in the back when we go fast?

CtrlAltDefeat
10-27-2009, 10:56 PM
does the egg shape cause turbulence in the back when we go fast?

The blunt rear end causes a low pressure air bubble behind it which may or may not increase drag. I believe the bubble helps out, because when mythbusters tested which is better, whether to leave the tail gate up or down on a truck for aerodynamics, they found that up was better because the low pressure air bubble that formed inside the bed helped direct air around the truck. Also, the drag on the sedan is the same as the LB so my guess is the air bubble is directing the air around the car.

LtNoogie
10-27-2009, 11:57 PM
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?

http://i426.photobucket.com/albums/pp346/LtNoogie/IMGP0825.jpg

CtrlAltDefeat
10-28-2009, 12:08 AM
You mean like these?

http://i426.photobucket.com/albums/pp346/LtNoogie/IMGP0825.jpg

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

THE ONE
10-28-2009, 03:33 AM
Not a photoshop, but real... experiment I did last spring on a 1600 mile road trip. Best tank was only 51mpg, but granted we were loaded down with a LOT of camping gear.

Mods included taping ALL seams, removing wipers and fairing that area, covered foglight recesses, upper grill block, moon wheel covers, removed antenna, removed sidemarkers, side mirror fairings, garage door front lip, and a functional rear diffuser :)

Nice project! Interesting... :thumbup:

fmicle
10-28-2009, 12:44 PM
The blunt rear end causes a low pressure air bubble behind it which may or may not increase drag. I believe the bubble helps out, because when mythbusters tested which is better, whether to leave the tail gate up or down on a truck for aerodynamics, they found that up was better because the low pressure air bubble that formed inside the bed helped direct air around the truck. Also, the drag on the sedan is the same as the LB so my guess is the air bubble is directing the air around the car.

Did you guys see the one where they covered a car in clay and cut dimples in it, to replicate the golf ball surface? And the mpg improved like crazy?

I'm thinking about getting the mallet out and start working on the body...

XYaris
10-28-2009, 05:17 PM
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
10-28-2009, 06:25 PM
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
10-28-2009, 06:41 PM
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
10-28-2009, 06:54 PM
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
10-28-2009, 07:33 PM
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...

Twizzstyle
11-03-2009, 10:58 AM
More diffuser photos...

http://photos-h.ak.fbcdn.net/photos-ak-snc1/v3867/225/12/10708561/n10708561_43066137_4852165.jpg


Without it...

http://photos-b.ak.fbcdn.net/photos-ak-snc1/v3867/225/12/10708561/n10708561_43066129_2899159.jpg

With it...

http://photos-e.ak.fbcdn.net/photos-ak-snc1/v3867/225/12/10708561/n10708561_43066130_5697927.jpg


I am an aeronautical engineer, so all of this stuff fascinates me greatly :) I made the diffuser out of steel sheet metal, which was heavy, but I had the material laying around so it was perfect. The fins were just tack welded on. I took it off the car after the trip last spring, but its still laying around. I'd really like to use it as a guide, and make a fiberglass or carbon fiber copy to put back on the car permanently.

The front end of it bolted onto the rear suspension beam with a few large U-bolts, the rear of it had some bolts going up to some tabs around the rear bumper. It just barely clears the tailpipe going around the muffler.

Vortex generators add energy (turbulence) to an otherwise laminar boundary layer, which makes it want to stay attached more. Putting VG's on the very end of the roof as in the picture above won't do much... the flow is going to separate on that aft corner anyways, you can't make it bend around that sharp of a corner :( In this case it may be better to encourage it to seperate at that point, and always at that point... thats what the stock add-on spoiler does, thats why I have it, thats why new Prius' have sharp corners on the sides of the rear bumper, take a look ;)

The rear end of our car kinda sucks aerodynamically, but the front is great so it makes up for it. If you wanted to make BIG changes, you'd need a giant cone fairing hanging off the back end, and that just isn't feasible. The mirror fairings I did (cones of polycarbonate) were a silly idea... they worked, but made the mirrors barely usable... probably not legal, but for the long mostly empty road travels we did with them on, it was ok. I'd really like to get some APR mirrors, or just do tiny cameras with screens inside, the stock mirrors are HUGE and ugly aerodynamically speaking :(

fmicle
11-03-2009, 12:30 PM
Dude, this is cool stuff! :smile:

jjonrofl
01-08-2010, 10:03 AM
I was bored this morning and took some time to try and make a realistic looking aerodynamic yaris sedan. Here's what I came up with...

http://i49.tinypic.com/29440a0.jpg

:laugh: Tell me what you guys think

jjonrofl
01-08-2010, 10:04 AM
Oh, and here is the original photo for reference..

http://i45.tinypic.com/20uodo5.jpg

Sodium Duck
01-08-2010, 10:08 AM
Looks like a sedan version of the Honda Insight.

marcus
01-08-2010, 10:11 AM
had been posted b4 but ill post it again.. here..

jjonrofl
01-08-2010, 10:15 AM
way to steal my thunder marcus :O

jjonrofl
01-08-2010, 10:15 AM
(jokes jokes) :biggrin:

marcus
01-08-2010, 10:21 AM
lolz...sorry bro..some dude post it on yahoo i just stole it from him too...hehehe