Hey guys,

This post is not the same as my other spoiler post in this section, however related.

Now, I've had both factory spoilers on this car. The car came with a low-profile. Then I swapped trunks and got the high-rise. Then I removed the high-rise and was wingless. however I once again bought a high-rise and am currently in the process of getting it securely attached. Since this winter has sucked ass, I haven't gotten to properly seal it yet, but I will likely do some come Saturday with actually bringing the trunk inside and doing it as opposed to in the cold garage and it not seat properly.

Now, onto the situation. My other high-rise was a factory trunk and spoiler combo, however I believe the spoiler was removed and reinstalled because the adhesive wasn't perfect. The spoiler seemed to have a little bit of play. Unlike my factory low-rise. The low-rise didn't really flex any. The high-rise seems to. Not like it's broken or anything, but it's just not very solid feeling. When you close the trunk it kinda shakes. When I look in my rear-view while driving, the center beam is seemingly vibrating. Etc.

Maybe it's because my spoiler is not currently sealed properly, nor was my old one. I don't know. I'd allow for a little bit of flex since it is an oddly shaped spoiler (nothing to really support the beam), and it's also large - however it kinda seems excessive.

Is this just because of the adhesive, or does this spoiler just flex alot and I should buck up? lol Thanks!

 

I have never owned a high rise but in my experience with the low rise, they are hard as hell to separate from one another.

I mean I thought I was going to break the spoiler when I tried to pull it off the trunk. I finally got it off by heating the adhesive up with a heat gun.

To me, it sounds like someone swapped spoilers(low rise to high rise), or replaced the factory high rise.

I can tell you that mine was a bitch to get off, and no "play" or vibrations what so ever.

 

my factory high rise waved @ me above 50 mph since day 1. however. the cf blade doesnt.

 

That ^

These things move more than a guys hand when looking at the "Hot Chick" thread.

 

 

X2

The high rise spoiler has a lot of flex at or above highway speed.

 

Is that just because of the size?

And what is up with the "bumps" inside the factory spoilers? Is that to increase/decrease some type of air flow under the spoiler or just to remove surface weight? Was wondering that yesterday.. On the under-side of the spoiler deck..

 

my guess is that indent is there to offer some support and stiffen up wing a little

 

Yeah my wing vibes as well... kinda annoying a friend of mine's SC actually making a really annoying humming noise (least mine's quiet)

 

The oem high rise is multi piece and larger, hence the excess flexing. The low rise is one piece... so there is alot less to move.

 

Yeah, my low-rise flexed very little and never squeaked or rattled.. But it looked stupid.. lol

 

^^^ is waving a bad thing?

 

I like my stuff to be solid. lol

 

There are two reasons the high rise flexes so much.

One is not only that the low rise is one piece, but if you look at the low rise and the high rise you should notice two things. One is that the low rise has less distance between the supports. The low rise being one piece and the supports actually being part of the spoiler, where as the high rise supports attach at the sides and are bolted to the top piece.

Second is that since the high rise is taller, it actually sits in the flow of air which causes it to flex. The low rise does not get as much air flow through it.

Now, neither of the spoilers really do anything. They are pretty much for show only.

 

That's not totally true.... During testing, GM found that the high rise helped create enough downforce over the rear to aid the car while going in/out of sharp higher speed turns. It pretty much keeps the ass end of the car from coming out from under you while on a road coarse.

 

downforce numbers. Also look at the high rise blade underneath isnt solid...

High Wing vs. Low Wing Deltas (all valves normalized for direction)
@155mph
115 lbs of rear downforce
8 lbs of front lift
19 lbs of drag or 8 hp

@120mph
69 lbs of rear downforce
5 lbs of front lift
12 lbs of drag

@100mph
48 lbs of rear downforce
3 lbs of front lift
8 lbs of drag

@70mph
23 lbs of rear downforce
1.5 lbs of front lift
4 lbs of drag or 0.73 hp

those are from Bill the gmpp engineer.

 

Good info. !! Bill is the man .... I always go to him for the facts on our cars

 

Bill is a smart man.

I talked to John powell though about the best spoiler for a track and its no spoiler = fastest but if you want some downforce a blade right off the trunk (like nascar is going to again) is the best. The stock high rise with that missing chunk underneath its blade and the way its shaped causes turbulence. as you see on the time attack car their spoiler is nice..but I think i was quoted 2k or 4k for it.

 

Yeah, I like the time attack spoiler but to get one like it is so damn expensive. Since my car almost never even gets anywhere near 100 mph, I can't justify spending so much on a new spoiler.

 

So the high-rise actually DOES work as a spoiler should - technically?

 

Yes ....

 

Also, is the center beam actually removable? I'd imagine as they make c/f pieces for it.. If so, how?

 

STi's do it also. no biggie.

 

yes there is a CF center blade for the high rise, they are on ebay.

 

off subject but does a high rise look odd on a 2.4? just curious lol