Not looking for opinions looking for knowledge and experience thanks.
I have been recently working with a light weight carbon fiber spoiler I modified that I like for one of my project cars. The idea behind it was to work with the factory spoiler. I personally do not like the looks of any spoiler on the market and definitely dont like the idea of disabling the factory spoiler through the various methods each spoiler comes with and losing any features the car came with for looks. Obviously I'm not an engineer and dont have access to a wind tunnel. Does anyone know the specs of the factory spoiler in a coupe for load limits if any? Meaning wind/speed force/pressure





. The spoiler itself obviously creates a larger area of friction and I'm wondering if anything in the car will be effected by this. I worked with the shape of the spoiler to compliment the airflow (at least I think I did) and running the car up to 75mph with just double sided 3m tape I didnt notice any difference at all. I'm curious about higher speeds and if the additional force on the factory spoiler would cause damage? I'm about to the point drilling and bolting it on permanently but hesitant for obvious reasons.

Theres a youtube link below to the spoiler.


Thoughts besides it's going to fly off at 150mph and kill someone or my cars going to tailspin into oblivion or it looks awful? Something I'm missing besides an aeronautics engineering degree lmao. Remember it's just a car and this is how we learn..

 

Travis -

i recently purchased the vicrez wing for jaguar f type. It mounts to the factory wing. Obviously I will have to disable the factory wing. I have been looking for any install instructions for mounting to the factory wing. Do you have any tips or can you point me in the direction of a forum post you found helpful on the matter? TIA

 

Travis, I think to get the answers to what you are seeking is going to involve some money. Specifically time in a wind tunnel. There are a lot of variables in what you are asking for. But, the benefit of putting the car in the wind tunnel is you will get very accurate answers to what you are seeking. Doing a little looking, it is probably not going to be cheap unless you can find someone else (or two or three people) to spread the cost over. Granted, part of it may depend on the requirements the wind tunnel has (requires you to rent only by the hour, has a minimum hour requirement, etc). But, in your case, you can do say 3 tests. First test with the car in a normal condition, factory wing not deployed. The second test with the factory wing deployed. Then the third test with the aftermarket wing installed (factory wing not deployed). This will give you real world numbers of how much downforce is being created by each condition. Most wind tunnels only flow up to say 80 mph, but, the numbers can then be ratioed out to whatever speed you desire. Without getting into Jaguar engineering information, I think the numbers that you seek are going to be hard to find. Now, with that being said, looking here (https://www.jaguarforums.com/forum/f...nforce-160776/), it states that Jaguar states it provides 264 pounds of "less lift". Now, you can read that as down force or simply changing the aerodynamics so the back end does not lift as much as a car without it does. Kinda a potato or a "pa"tahto. But, without putting your new wing into a wind tunnel, any number you get will be simply that, a number with no substance.

Now, please do not take this as I am hating on the wing or anything of the sort, but looking at the angle of the wing, I am fearing that you may find that the wing is going to actually cause even more lift than not having a spoiler/wing at all. From the pictures, the wing seems to be pointing upwards on the front edge. Maybe it is just the pictures making it look that way. But, this is where the wind tunnel test is going to tell you a lot. This is where you may want to come ready to add a wedge to change the angle of the wing by a few degrees to see how much of an effect that may have. You can then potentially talk with the wind tunnel guy to see if he may be able to give a "go an additional 5 degrees, you should see XXX change in downforce". That way, once you decide I need a finite amount of downforce, you can play with the angle some and get what you are after (whatever that may be).

With this all being said, some members have commented that having the wing deploy made the front end of their cars seem more unstable due to the back getting pushed down and effectively "lifting" the front of the car up. Just something to read. The forum post goes into this that I linked. I am by no means and aero guy. I understand the basics of things, but to say that a car needs XXX pounds of downforce to obtain a speed of YYY safely is way beyond what I claim to know.

 

Well, you just created a wind brake.... That much angle of attack will stall the air and cause a lot of friction to the air (i.e. make the car harder to go faster). If you've ever seen some of the active aero on the hypercars, they open up flaps similar when the car is under heaving braking to assist.