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> Lifting rear of roof, what are the benefits
J P Stein
post Jan 7 2006, 01:48 PM
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Dunno, I'm fighting the Ginther wind screen urge.....
My windshield is starting to piss me off. (IMG:http://www.914world.com/bbs2/html/emoticons/screwy.gif)
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brant
post Jan 7 2006, 10:14 PM
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I would think it would be the least drag, and a tiny bit of weight savings....
then a tonneau over the passenger side.

get a belaclava thou

brant
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race914
post Jan 10 2006, 05:15 PM
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Received my airtabs today and just set them on to mockup the spacing.

Plan is to paint to match the top & stripe.

Going to test with this first before lifting the top.



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SirAndy
post Jan 10 2006, 05:48 PM
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QUOTE (race914 @ Jan 10 2006, 03:15 PM)
Received my airtabs today and just set them on to mockup the spacing.

shouldn't they be mounted 180 deg. rotated?

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race914
post Jan 10 2006, 06:05 PM
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QUOTE (SirAndy @ Jan 10 2006, 03:48 PM)
QUOTE (race914 @ Jan 10 2006, 03:15 PM)
Received my airtabs today and just set them on to mockup the spacing.

shouldn't they be mounted 180 deg. rotated?

(IMG:http://www.914world.com/bbs2/html/emoticons/huh.gif) Andy

Hi Andy,

I thought so too at first. Good thing I read the directions from the manufacturer www.airtab.com

Here is their diagram of the concept of operation


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TimT
post Jan 10 2006, 06:08 PM
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No those are mounted in the correct direction.

Airtabs
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gregrobbins
post Jan 17 2006, 12:40 AM
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QUOTE (john rogers @ Jan 2 2006, 10:34 PM)
If you ever get a chance to take a close look at it you'll find that the floor has been cut out and is a large aluminum sheet with a passle of small chrome molly tubes here and there that take the place of all the heavy duty sheetmetal that Porsche has installed. Same with the front and rear trunk areas and many cars now duplicate this sort of "original metal removal" and replace with tubes. Here's a couple of picts that illustrate some of the mods.

I had a chance to see #22 run at the HSR Palm Springs event. Afterwards I talked to the driver and crew. I am pretty sure they told me there was no VIN#, its a tube frame and 914 style body. Has a 2.0L four that is driven by a BMW mechanical fuel injection system and the car hauls ass.
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retrotech
post Mar 3 2006, 11:08 PM
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Any results, or opinions on the Vortex generators after mounted?
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race914
post Mar 4 2006, 08:46 AM
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QUOTE (retrotech @ Mar 3 2006, 09:08 PM)
Any results, or opinions on the Vortex generators after mounted?

Will be going to Buttonwillow in April

Good test for me because I'm in 5th on the 'riverside' turn and the rear end has always been light and dances around.

I'll report my results.


I saw a mention in the 'Phoenix Track Day' thread that Wayne Baker was there and commented on the vortex generators and something about 'stable at 160'. I'm hoping to be stable at 130!
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retrotech
post Mar 4 2006, 09:46 AM
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Any pictures of them mounted? Painted to match yet?
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retrotech
post Mar 4 2006, 09:51 AM
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Where can I find that info from Wayne baker?
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alpha434
post Mar 4 2006, 10:01 AM
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Hey Racer914!

Don't forget that your leaving really bad turbulence behind you, too. That could make it really hard your someone to follow you down the straight.

Just seeing if I can help with some strategy....
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Al Meredith
post Mar 4 2006, 11:17 AM
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Mythbusters on Discovery did a comprehensive show on tailgate up vs tailgate down on a pickup. Up is better because there is a "rolling" ball of air that builds up behind the flat rear window and the air comming over the top skips over that rolling ball and is less drag overall.
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race914
post Mar 4 2006, 12:23 PM
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QUOTE (alpha434 @ Mar 4 2006, 08:01 AM)
Hey Racer914!

Don't forget that your leaving really bad turbulence behind you, too. That could make it really hard your someone to follow you down the straight.

Just seeing if I can help with some strategy....

I Love it!

I need to add that to my bag of tricks.

Actually the rear end twitching around keeps people back now through that turn!

At a previous event I was watching a 911 turbo come on me and then it suddenly backed off. Found out one of my brake cooling tubes (3" aluminum dryer venting from Home Depot) had come off and dropped onto the track. Turned out it was Hank Watts (Secrets of Solo Racing) behind me and I told him I was using the same strategy as WWII U-boats and occasionaly jetison parts. That did make him laugh.
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race914
post Mar 4 2006, 12:30 PM
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QUOTE (retrotech @ Mar 4 2006, 07:51 AM)
Where can I find that info from Wayne baker?

It was in the Vintage Racing: HSR West thread.

1st page. Response by Greg Robbins

"Wayne is running a four that he told me puts out 165 hp. Running a SCAT balanced crank, Cam (he wouldn't say which one), euro pistons, and 44mm Webers. I am sure he is running high compression as he runs race fuel. He's not a six, but he sure is fast.

I asked him about the airfoils on the back of his targa top. He said they don't do anything and smiled. Said they were on the car when he got it. Then he added there is no way to test if they work or not. Told me the car had run 160+ at Daytona and was very stable. Many find the cars get light on the rear at 130+. HSR does not allow spoilers or wings which is why you don't see them on any of the cars."
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DanT
post Mar 4 2006, 12:31 PM
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I'll probably see you at BW, Greg.
Be there with the new whip.

Hope to get everything buttoned down by then.

On my last items on my Punch List.

Oil cooler and plumbing.

Mine will be a virgin....no spoilers or airdams, no vortex generators (IMG:http://www.914world.com/bbs2/html/emoticons/sad.gif)

But it will be fun!

See you and Tricia there.


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gregrobbins
post Mar 5 2006, 10:27 PM
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QUOTE (retrotech @ Mar 4 2006, 08:51 AM)
Where can I find that info from Wayne baker?

Me.

I met and visited with him at the HSR West event at Phoenix. I asked him about the vortex tabs on the roof of his car. He told me he didn't know if they worked or not, then smiled. He added that he didn't know of any "scientific" test to prove that they worked or not. Then added the car ran 160 at Daytona and was stable.

Can it do 160? Not sure, but it is one "kick butt" 914 and Wayne is one hell of a driver.
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gregrobbins
post Mar 5 2006, 10:29 PM
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I sent an email to the company who makes Airtabs. I got a reply from the inventor, Gary.

QUOTE
I had a llittle 914 back in 1971 so am quite familiar with it.  Airtabs
should be mounted across the trailing edge of the roofline.  That
vertical rear window type of "step", results in Airtabs increasing the
turn angle of the main flow, so more mass-flow hits the trunk deck
spoiler.

He'll be very lucky if they're accepted as legal.  Sanctioning bodies
are usually notoriously against things like vortex generators.  For
example, I had a very bad time with NHRA over them - when installed on
the world-record-holding Top Fuel Funny Car.

They lived to regret it because I definately got my revenge and old
timers still talk about it to this day.  But that's another story for
another time.

Gary
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brant
post Mar 6 2006, 11:28 AM
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So the company basically confirmed that If your rules say: "no modifications for the purpose of Aerodynamics"

then you would be cheating to use these.

imagine that.

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(some questions you shouldn't ask)

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maf914
post Mar 6 2006, 12:04 PM
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QUOTE (Al Meredith @ Mar 4 2006, 09:17 AM)
Mythbusters on Discovery did a comprehensive show on tailgate up vs tailgate down on a pickup. Up is better because there is a "rolling" ball of air that builds up behind the flat rear window and the air comming over the top skips over that rolling ball and is less drag overall.

Last year in Road & Track magazine there was a brief article about the tailgate up or down question. Ford indicated that wind tunnel tests showed there was less drag with the tailgate up.
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