Takin' the Vortekz plunge - Page 2 - Fuelly Forums

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Old 01-07-2008, 08:16 AM   #11
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My Jeep is the same color as flour...lol. Are you going to add any to the sides of the Volvo?
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Old 01-07-2008, 08:30 AM   #12
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I like the suggestion on the website for how to find the point of separation...
I've done something similar w/ the Volvo in the observation powdery snow on the roof of the car. After a short trip @ highway speeds, the snow disappears only @ the rear of the roof(~24" section in front of the hatch). My VGs are mounted ~7" from the drop-off point, so they should be in the heart of the flow. The folks @ "Vortekz" did recommend to me that I mount them as far back as possible on the boxy wagon.

On the Audi wagon, I was able to mount them even further back without interfering with opening the hatch. Like the Volvo, all 10 fins fit perfectly between the OE roof rails.

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Originally Posted by DarbyWalters
Are you going to add any to the sides of the Volvo?
No, but if I did I'd use Airtabs instead. Vortekz delta fins are intended for the roof only.
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Old 01-11-2008, 09:01 AM   #13
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OK, Its only been a week since the VGs were installed on my Volvo wagon. Its still too early to tell, but my FE has pretty much remained the same...then again, my time on the open highway has also been limited.
It was raining and foggy this morning and I did notice something kind of unusual in the water mist behind the car while driving on the highway during my commute...two slightly visible, counter-rotating vortices extending from the roof area. My rear lip spoiler is still on, but the vortices still seemed to flow level with the roof height without being deflected upwards. The spoiler will be coming off in a few weeks, so we'll see it some downward flow can be induced. The next time it rains, I plan on letting my Wife drive while I sit in the back to observe them more closely.

On another note, my co-worker has noticed a cleaner rear window on his A6 Avant. But he did tell me that it gets just as dirty @ lower speeds.

Also, my Dad's VGs came back from the bodyshop this week. They were painted Mazda 'Silver Green' and the bodyshop did a fantastic job in matching the color. Total cost for painting 10 VG fins...two pepperoni pizzas(it helps having friends in the autobody biz ) They'll be installed soon.
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Old 01-11-2008, 09:27 AM   #14
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That would make a good picture. wink, wink, nod, nod.......

"It was raining and foggy this morning and I did notice something kind of unusual in the water mist behind the car while driving on the highway during my commute...two slightly visible, counter-rotating vortices extending from the roof area."
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Old 01-11-2008, 09:35 AM   #15
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Ok, I'll open up some discussion. I find the VG stuff really interesting.

With just some preliminary info from the Airtab site, and going off memory, they discussed that there was a point when each individual Airtab being a certain distance apart, the vortex generation would be reduced. Reduced to a point where it wouldn't be useful. I'm paraphrasing.

Could it be that the Vortekz generators don't produce enough disturbance in the air to generate enough effect to be useful?


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Old 01-11-2008, 09:59 AM   #16
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That would make a good picture. wink, wink, nod, nod.......
Even better as a video, but it'd have to be really high res...I'll see if I can find the resources to make that happen.

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Could it be that the Vortekz generators don't produce enough disturbance in the air to generate enough effect to be useful?
I'm not exactly certain, which is why I installed them. But this exerpt from the Mitsu pdf is encouraging...
Quote:
It was found that the optimum height of the VGs is almost equivelent to the thickness of the boundary layer (15 to 25 mm) and the optimum method of placement is to arrange them in a row in the lateral direction 100 mm upstream of the roof end at intervals of 100 mm. The VGs are not highly sensitive to these parameters and their optimum value ranges are wide. Better effects are obtained from delta-wing-shaped VGs than from bump-shaped VGs.
Vortekz basically mimicked the Mitsu delta-wing design and placement arrangement, whether of not they'll actually help my boxy wagon is yet to be seen.
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Old 01-17-2008, 10:48 AM   #17
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Pics of my wagon....finally.





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Old 01-17-2008, 11:21 AM   #18
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Yeah that spoiler needs to come off, I can see at once the airflow gets disturbed too early, even after the spoiler comes off they might be too far forward thou without spoiler they might work.
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Old 01-18-2008, 08:19 AM   #19
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SL8Brick,
Looks good. Have you had a chance to get any hiway miles yet?

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Old 01-18-2008, 12:52 PM   #20
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SL8Brick,
Looks good. Have you had a chance to get any hiway miles yet?

Phil
Thanx, Phil. No prolonged highway opportunities yet, but it did take me 2.5hrs to drive 33mi in the snow last night ....that should do wonders for my FE average.
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