Perrin Hatch Wing Riser

I have been trying to find a rear wing for my hatch that does not look obnoxious for DD duties that would also increase the downforce on the rear end of the car for track days. So far, it looks like the WRX replica (really loud looking), BT Aero (more subdued than the WRC) and the Voltex bolt on have been the only options. Not only are they all crazy expensive, but they really stand out.

Perrin just released this wing riser and I was going to see what you guys thought of the idea. It might be a way to get the rear end a little bit more planted without sticking a huge wing on the car.

http://www.perrinperformance.com/subaru/wing-riser-kit

 

It doesn't look like they do. The only one I have found that has any testing at all is the Voltex.

 

Rear wings look werid on hatches and espicially wagons, that Perrin one doesn't look bad at all though. I've seen all the different types on hatches and I've got to say that Perrin one probably looks the best, then again Function > Form right? If the others companies acutally produce downforce, to hell with the looks (-_^).

 

My hunch is that would hurt rather than help. I'll point someone in this direction that might know.

 

Instead of making it look fluid it looks slapped on IMO. And I agree with bixs.....hunch tells me it's gonna make it worse or do nothing at all.

This pic here makes it look like it's not 'fluid'.


All that said it is the best non-OEM look of them all though.

 

I think Perrin designed it for aesthetics more than performance

 

here (should answer the question):


They don't the air down the back window, they just add another wing.

On the subaru rally team wings they leave a hump at the top where the spoiler is, then the lower part of the wing cuts off any air from going down the window. It's 1/3 of the way from the top of the window, but it still doesn't let the air down.

 

lol, at least the lower part..

 

I REALLY want that front splitter and that top wing is only cool if you stack two more on top of it. :rofl:

That is a function FTW setup for sure but I wouldn't rock it daily. In the stock wing location, they did add more lip which would aid in downforce.

With the Perrin setup (stock wing lifted), it should decrease drag and increase downforce by acting like an actual wing (think reversed airplane wing) and reducing turbulence. As the stock wing sits right now...it is really just for looks. An increased lip would increase downforce or lifting it in conjunction with changing the angle could give the air needed below and under the wing for optimal performance. How much downforce the stock wing design is able to apply independent of location and installation is another question entirely. It might be the case that no matter where it is positioned on the car, it won't apply enough downforce to make a difference due to its design.

I do think the Perrin setup will help. The question is whether or not that percentage change is significant enough to feel in the car (or by the numbers) to make it worth doing. You sedan guys get all the cool aero toys...

 

Just as a FYI...what started this whole thought process for me is that this Voltex wing does actually have wind tunnel testing and that does translate to better handling and feel on the track. I was really surprised how much different Lucas' EVO felt on the track than other EVO's I have been in. It is PLANTED.

 

I really really don't think it's a good idea. I was trying to figure out why. First off, you can't tell me the stock spoiler is just for looks..That's kinda silly to assume when you drive a car with functional scoops and under car tray. The air is being directed by the stock spoiler by being straight and having the guides along the side. Imagine snow (or dirt if you've never shoveled snow) coming off the end of a shovel. You could even grab a toy from Daniel (he have any beach shovels??). Use water or sand. Now find a flat piece of anything and do the same thing. It should already be obvious how directed the flow will be off the shovel.

Now, take off the stock smoothing and add the raised spoiler. I would say sure it might act like a normal wing you see on a sedan, but imagine the air is now falling off the roof and not being guided off as it should for a cleaner wake. They are at least canceling each other out, and you're messing with something that was put on there for a reason. That perrin wing does not have any vanes making the air smooth, it looks like it's just raised. Like it says.

This is just not an issue on most cars as their rear windows slope down a lot smoother. The air is going to follow the curve. The window on our hatches is going to just "fall off" the back, not follow the rear window.

 

But with the wing out and angled more 'upwards' it should give more downforce. How much is debatable but it'll probably give more than stock.

 

Just look at every real race car in the last 50 years? They all have a shelf of sorts to smooth the air coming off the back, they don't let the air do whatever it wants by just coming down the back window.

BY THE WAY, 24 HOURS OF LE MANS THIS WEEKEND, don't miss it!!

 

Bad choice of words on my part. Not no function all looks but factory aero on our cars is ultimately derived from the Imprezza. The hatch spoiler is basically just a longer version. Factory aero on the car has to balance more drag reduction rather than downforce for track use. If they can take some downforce put of the car and gains mpg...they will given that it is still in street able tolerances. In the sedan, they were able to introduce a HUGE functional wing in the spirit of a "STI" version of the car. By that same token, it would almost be like putting the WRC spoiler on my car (or the STI version).

So does it do something? Yes. What degree that is increased over the stock Imprezza would be interesting data to see. Does it have the same effect as the spoiler on the STI? No.

 

No really I think it will hurt your aerodynamics. The spoiler is still fairly flat, and the only change is that the air can go under the spoiler. It honestly looks like you're allowing air through that gap and down the back window. Do you see that when you look at it?

And when I say that, I mean you're going to create lift.

 

Not that much air is going to go under it. Hell look at the STi wing. You think all that air going under it overpowers the downforce the wing produces at high speeds? Even the T|S|M GTR is tall....lots of air going under that wing too.

 

Absolutely. The question is how much that is offset by the increase in downforce. All speculation of course and good for discussion. A clean rear window is not a feature benefit to me.

The only one that I know is 100% functional is the Voltex. It actually bolts onto the existing hatch spoiler. It just equals $$$.

 

Is the Voltex able to be removed with no evidence that it was there before?

 

That is because you want the actual wing in clean air so it's sole purpose is to create downforce for the car without interrupting the aero of the body which would create more drag.

I am pretty sure what David is referring to is the difference int he way a hatch reacts to airflow vs. a sedan. But...if you look at the other picture of the hatch...they have that wing in that position to get it clean air but they still incorporate a rear shelf as well. But...their rear shelf is not flat.

 

Ah I see David's point. Thanks for making that more apparent.

 

The WRC styled wing actually forces the air down the window and into the wing.

 

realistically just tape pieces of string even intervals apart from each other and have someone take a picture of you on the highway

 

Yep yep, If you take a sedan profile and a hatch profile without that roof extension, one looks like a giant airfoil more so than the other.

 

The other way to accomplish the same goal would be to add under-trays and a rear diffuser to decrease the pressure under the car thus creating more downforce. Something else that isn't readily available or tested...

 

I have the fan that can provide up to 70 mph wind.

 

slightly, but the lower section of it is acting just as the top section does on a stock hatch. It's guiding the air straight backwards.

 

aye, but your car comes with both. Not race ready by any means, but looking at the design of the exhaust sideways across the back, with the bottom edge of the bumper curving upwards right off of the exhaust always made me imagine they did it on purpose. Not necessarily great effects from it, but better than nothing being there. You left your tray under your engine right? I hear plenty of people taking them off, but I always figured it would ruin the design of the outlets in front of the doors/undercar flow.

 

I put it back on. It required some trimming to get it around the new intercooler piping but there is function to that I didn't want to give up. The rear, while designed with that in mind, does need something. The only issue is finding one that is tested and giving up the exposed exhaust look that I like. For a rear diffuser to do its job on the hatch, it really needs to extend from corner to corner covering up the exhaust.

 

I know I keep mentioning Voltex...but this one for the 05-07's is tunnel tested.

 

APR makes a front splitter at least that includes support rods.

 

Jeff check facebook I have an idea.

 

The old wagon had a small gap between it and the read hatch and Subaru R&D'd that design out when they switched to the GR harch chassis for a reason.


The only way to truly find out is to spend the $200+ that Perrin wants on this and try it first hand. I don't think you will e happy with the results though.

 

They only want $132 for it but that is still expensive for a couple of cables and stops in my opinion.

 

I never really liked the look of the Voltex diffuser. Never seen one in person though.

 

Aero that performs rarely looks good.

Time Attack winning RS (looks badass as a race car but dumb on the street)



and we all know the Scion