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10-22-2009, 10:48 AM | #19 |
Drives: Future Yaris! Join Date: Oct 2009
Location: Fort Worth, Texas
Posts: 38
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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)
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10-26-2009, 09:45 PM | #20 |
Drives: 2002 WRX, soon 2008 Yaris Join Date: Sep 2007
Location: Kirkland, Wa
Posts: 12
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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 :) |
10-26-2009, 10:12 PM | #21 |
I ♥ Yaris
Drives: Black 08 LB MT & red 97 Miata Join Date: Oct 2008
Location: Indianapolis IN
Posts: 1,313
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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...)
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The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt. - Bertrand Russell |
10-26-2009, 11:16 PM | #22 |
that rear diffuser is awesome! How'd you do it?
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10-27-2009, 03:42 PM | #23 |
Drives: '09 Yaris LB Join Date: Dec 2008
Location: NYC
Posts: 152
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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? Last edited by XYaris; 10-27-2009 at 03:46 PM. Reason: New idea |
10-27-2009, 10:05 PM | #24 |
I ♥ Yaris
Drives: Black 08 LB MT & red 97 Miata Join Date: Oct 2008
Location: Indianapolis IN
Posts: 1,313
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Spoilers are made to create down force by increasing drag. Spoilers will only hurt your fuel economy. (vortex generators on the other hand...)
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The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt. - Bertrand Russell |
10-27-2009, 10:14 PM | #25 |
does the egg shape cause turbulence in the back when we go fast?
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10-27-2009, 10:56 PM | #26 |
I ♥ Yaris
Drives: Black 08 LB MT & red 97 Miata Join Date: Oct 2008
Location: Indianapolis IN
Posts: 1,313
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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.
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The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt. - Bertrand Russell |
10-27-2009, 11:57 PM | #27 | |
Drives: '08 Bayou Blue LB AT Join Date: Oct 2008
Location: West Hills, CA
Posts: 2,517
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Quote:
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aFe Intake | Blitz Supercharger | Megan Header | TRD Exhaust | NST Pulley Set TRD Shocks/Struts | Tanabe NF210 Springs | TRD Sway Bar | Motegi TRAKLITE wheels | Kuhmo Ecsta XS R1 Concepts slotted rotors | Carbotech 1521 brake pads | stainless steel brake lines | Seibon vented carbon fiber hood |
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10-28-2009, 12:08 AM | #28 |
I ♥ Yaris
Drives: Black 08 LB MT & red 97 Miata Join Date: Oct 2008
Location: Indianapolis IN
Posts: 1,313
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yea, those. I think they cause the air bubble to be lower and the air stream to adhere to it better...
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The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt. - Bertrand Russell |
10-28-2009, 03:33 AM | #29 | |
ドン フアン
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Quote:
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10-28-2009, 12:44 PM | #30 | |
Drives: 2007 Yaris LB Join Date: Mar 2007
Location: San Jose, CA, USA
Posts: 685
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Quote:
I'm thinking about getting the mallet out and start working on the body... |
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10-28-2009, 05:17 PM | #31 |
Drives: '09 Yaris LB Join Date: Dec 2008
Location: NYC
Posts: 152
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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.
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10-28-2009, 06:25 PM | #32 | |
I ♥ Yaris
Drives: Black 08 LB MT & red 97 Miata Join Date: Oct 2008
Location: Indianapolis IN
Posts: 1,313
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Quote:
__________________
The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt. - Bertrand Russell |
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10-28-2009, 06:41 PM | #33 | |
Drives: '09 Yaris LB Join Date: Dec 2008
Location: NYC
Posts: 152
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Quote:
maybe the spoiler im referring to would create less of the aforementioned vacuum. dont know |
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10-28-2009, 06:54 PM | #34 | |
I ♥ Yaris
Drives: Black 08 LB MT & red 97 Miata Join Date: Oct 2008
Location: Indianapolis IN
Posts: 1,313
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Quote:
__________________
The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt. - Bertrand Russell |
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10-28-2009, 07:33 PM | #35 |
Drives: '09 Yaris LB Join Date: Dec 2008
Location: NYC
Posts: 152
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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... |
11-03-2009, 10:58 AM | #36 |
Drives: 2002 WRX, soon 2008 Yaris Join Date: Sep 2007
Location: Kirkland, Wa
Posts: 12
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More diffuser photos...
Without it... With it... 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 :( |
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