[cooz]

Hi All



any experience to share concerning adjustable rear spoiler?



is it worth the $1400 it would cost me for my 968 racer? legal for PCA F stock? Nasa supercup?



norm mandell

nmandell@optonline.net

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[uscarrera]

        Legal for F, looks cool, as far as performance not sure.

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[Mark]

Talking with no knowledge whatsoever, I would think that it would certainly reduce lift and possibly even generate down force.

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[Jason Judd]

Norm,



I've also been told it's legal for F stock...



I've got one on my car, go to Paddock and take a look at it if you want to see it up close.



Jason

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[Eric_K]

I put mine on at the same time as a lot of other changes so I can't say what adding the wing alone would do. It is a lot more aggressive than the stock spoiler. It definitely helps with high speed stability, how much, who knows. Since it is a factory design I'm confident there is solid engineering behind it. There is no reason not to do it - except $. The AIR version appears to be straight copy and is probably cheaper than the Porsche one.

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[cooz]

thanks to everyone for your comments....



i agree it looks cool and probably would not be bad...............however...



have any of you played with the adjustability to feel differences with handling/stability, etc.



i'm wondering if our top ends will actually benefit from this spoiler over stock unit?

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[333pg333]

Hi Guys. At the moment on Rennlist in the 944 turbo and 'S' section we are trying to get a run of Carbon Hoods up for our cars. However if you look on page 4 of this post my mechanic JET951 shows his AIR rear spoiler and remarks how disappointed he is with it and how expensive it wound up being to get to us in Australia. We are also considering doing a C/f version of it if any of you guys are interested. There would be a possibility of doing a run of other parts too if you got enough people interested. The costs would be a little higher by the time you imported it but the workmanship would be very good judging by this guys work so far.

Just a thought.



http://www.rennlist.com/

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[TC17]

Hi All



Please can anyone advise where you can buy the adjustable rear spoiler from ?



On this thread someone refers to an "Air" version, I have not heard of this manufacturer in the UK.



I am looking for either an original which I assume is still available through Porsche or an exact copy.



In the UK a company called V Sweeden offer a copy, but it is a very different design that looks at bit "Pants".



Any help would be appreciated.



Also, the wheels on US Carrera's car, what make are they ?



Cheers



Tony

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[flash]

AIR (American International Racing) is located here in southern california



www.americaninternationalracing.com/

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[jk968]

[quote name='cooz' post='28591' date='Nov 30 2006, 08:01 PM']Hi All



any experience to share concerning adjustable rear spoiler?



is it worth the $1400 it would cost me for my 968 racer? legal for PCA F stock? Nasa supercup?



norm mandell

nmandell@optonline.net[/quote]





Sorry to be jumping in here so late, but a recent message caused this thread to pop up to the top.



Here is what I can tell you which comes directly from the PCA Club Racing rules person. The adjustable wing is not legal in PCA F stock. While you are referring to it as a spoiler, it is in fact a wing, and that is the key. I cannot comment on NASA's rules.



I asked for a rules clarification on this because I wanted to add the adjustable wing and was told that it was only legal on 968s that were originally offered with the adjustable wing. That makes it legal only for the 968 Turbo S and RS as the adjustable wing was not offered on the base 968 or 968 Clubsport. I was also informed that a non-compliant wing would move the car up one class as "prepared."



If you have any questions on this, I would contact the PCA rules chairperson or you may find yourself running in E Stock because of the wing. <img src="/forum/images/smilies/968/sad.gif" class="smilie" alt="" />



Regards,

John

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[uscarrera]

[quote name='TC17' post='33503' date='Mar 30 2007, 05:24 AM']Hi All



Please can anyone advise where you can buy the adjustable rear spoiler from ?



On this thread someone refers to an "Air" version, I have not heard of this manufacturer in the UK.



I am looking for either an original which I assume is still available through Porsche or an exact copy.



In the UK a company called V Sweeden offer a copy, but it is a very different design that looks at bit "Pants".



Any help would be appreciated.



Also, the wheels on US Carrera's car, what make are they ?



Cheers



Tony[/quote]



Wheels are Kinesis K57

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[flash]

rules like this that are vague are such a pain - it's like that in pretty much every type of racing - i know of 2 "normal" cars that came from the dealer with the turbo s wing, and said so on the factory invoice - does that make them legal?

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[Renalicious]

So the rear wing is suppose to help stability at high speeds, but how fast as we talking about? over 100mph? I figure to get the most out of it you would need the front splitter and a lowered car as well.

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[flash]

wings generally do not become effective until nearly 150 - this is why i laugh when i see those ricegrinders with the big wings - they don't realize that a wing actually produces drag, and if you aren't going over 150, it is actually slowing you down



spoilers come into play earlier (as low as 50)



by the nature of its design, the normal one is really just cosmetic, but still more of a spoiler than a wing - it really has less to do with the height, than the shape



spoilers "spoil" or disrupt airflow, reducing drag - the really don't want to be much more than an inch off the back edge, and are less effective on a fastback or hatchback, than on a coupe



wings ceate downforce - they do this at the expense of drag - a wing uses an inverted arc to create dowforce - the curvature of the turbo unit indicates, at least to some degree, that they attempted to create a wing



here's the bad news - improperly adjusted, that wing can really cause problems - the added downforce, if too much, will heat up tires and make the back end of the car droop and produce drag taht is actually slowing you down - too little, and you won't have enough downforce at speed to stay in a corner - fortunately, the car doesn't really go fast enough to see the extremes of that equation, but at 170, i'm betting a small angular difference in adjustment makes a big difference in feel and control



street cars are much better off with spoilers

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[jk968]

[quote name='flash' post='33522' date='Mar 30 2007, 09:36 AM']rules like this that are vague are such a pain - it's like that in pretty much every type of racing - i know of 2 "normal" cars that came from the dealer with the turbo s wing, and said so on the factory invoice - does that make them legal?[/quote]



I think the key wording in PCA's rule book is that the wing had to be available as optional equipment, not special order.



I'd like to see the Porsche sales material that indicates if the adjustable wing was available as optional equipment or not. That would take the vagueness out of the rule.

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[flash]

probably would have been one of the following:



option 471,473,or 491

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[Renalicious]

So if wings don't become effective until 150, why did they even make them for the 968? Out of all the 968 race videos I've seen, the fastest anyone goes is top end of 5th gear. Definitely not 150mph. Wouldn't you be able to adjust it to make it effective at slower speeds? Say, 100mph?

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[flash]

certainly you can adjust the turbo wing to hit the air more - again though, more drag when you do



i should have said, "wings, when designed and adjusted properly, don't add any real useful downforce until about 150" - you could get downforce off of almost anything, but at the expense of a lot of drag



by the way, i got a chance to really look at the standard unit yesterday while poking a full coilover kit in a car - it has a slight inverted arc curvature to it, and is shaped much like a typical wing (teardrop profile) - i never noticed it before - cool - might be helping a bit

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[Eric_K]

The turbo wing has much more of an airfoil shape than the stock spoiler. I assume Porsche did this because it could see enough speed to actually work as more than just a spolier. A spoiler is there to reduce lift not really to create downforce. Small planes take off at less then 150 so I don't think you can just throw out a number for when 'a' wing would become effective.

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[flash]

it's related to surface area and weight to be pushed or lifted as well - notice the size of the wing on a small plane, and the weight of the plane - big wing, light weight = less speed required to provide enough lift - the curvature also factors in heavily - the more curvature, the faster the air over it, therefore more lift (or downforce)



by the way, i pulled that "150" number from a well known "text book" on the subject - i have not done any tunnel testing, or seen any either, that gives a specific number for these wings, hence the "about" reference - certainly different wings and things have varying levels of effect - look at the 917 and what they had to do to the tail of that car - it actually had too much effect and they had to shorten it

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