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Old 08-14-2009, 06:38 PM   #1
ScoobyNoob
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Default Benefits of rear spoiler

I have been dreaming of getting a WRX for yeeearrrrs and am finally getting very very close.

The one I have my eye on does not have a rear spoiler (owner says it came from the factory like that).

What are the pros and cons of a rear spoiler, especially on a 04 WRX?

From what I know a rear spoiler increases fuel economy and control at high speeds. Is there a noticable difference?

Thanks in advance and expect more questions from me as I get closer!
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Old 08-14-2009, 06:42 PM   #2
notjustforshow
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I remember back in '02 there were a few wingless wrx at the dealerships in seattle, so that may be true.

I've had a few spoilers (limited, STI, wrx, s203, wingless), and it doesn't make a big difference. I've tracked my car wingless though and it seems to help keep the rear down.

You can definitely trade other members for trunk+wing so its actually ideal that you dont have one off the bat hehe
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Old 08-14-2009, 06:48 PM   #3
elevenpoint7five
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it keeps the rear wheels planted better. its creates downforce. i dont know about fuel economy though. i assume it would create MORE drag causing LESS mpg.
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Old 08-14-2009, 07:11 PM   #4
paintbing
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I think a wing will help at the TRACK, so if you're not planning on tracking the car, the wind shouldn't matter that much**.

I am wingless and like the lack of attention I receive. I do notice that I miss the wing at the track (especially coming over off-camber hills.) When I hit 120 at the track (willow Springs front stretch) I wish I had a wing to help stabilize the car more.


**The wing WILL help overall, but if it comes down to you wrecking the car on a public road due to not having enough downforce via a wing, then you shouldn't have been driving like that in the first place.
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Old 08-14-2009, 07:21 PM   #5
Defiant Autospeed
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You can DEFINITELY feel the STI wing at anything over @85mph, and especially over 100mph. So, while you should only feel that at the track, the difference is there at least a little by 60ish, and if you drive like an ass (which NONE of us do, obviously ) it will be there on the highway.
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Old 08-14-2009, 07:30 PM   #6
bluemicamatt
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The OP is planning to buy a WRX, not an STI, right??

I just bought an '07 WRX TR and removed the rear spoiler after 60 days - can't tell a bit of difference so far...gas mileage is the same even though the factory spoiler does weigh a bit, and raging on the interstate seems the same in terms of grip/control and what not.


IF the OP was talking about the stock WRX spoiler, not the big STI spoiler, is there a common opinion??? it doesn't seem like the stock spoiler is tall enough to provide downforce, or shaped right.


I went to ACE hardware and spent $1.20 on tiny plastic plugs to stick in the trunk holes, looks fine, perfect fit...and i luv that cops don't eyeball me anymore!

In a few months I may stick it back on to see if i notice anything. For a DD, its nice to have nothing blocking the rear view.


mc
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Old 08-14-2009, 07:44 PM   #7
subaragnarok
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Default

Quote:
Originally Posted by ScoobyNoob View Post
I have been dreaming of getting a WRX for yeeearrrrs and am finally getting very very close.

The one I have my eye on does not have a rear spoiler (owner says it came from the factory like that).

What are the pros and cons of a rear spoiler, especially on a 04 WRX?

From what I know a rear spoiler increases fuel economy and control at high speeds. Is there a noticable difference?

Thanks in advance and expect more questions from me as I get closer!
+6000whp!
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Old 08-14-2009, 08:42 PM   #8
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Yeah I would bet that the WRX spoiler DOES work, but makes such a small difference that it makes no difference at any speed.
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Old 08-14-2009, 09:03 PM   #9
_FOoM
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Spoilers are more of a personal visual preference than a functional gain or loss in performance on the street. Wingless is the big fad at the moment, but most STI guys will return to it eventually when the car becomes more of an icon.
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Old 08-15-2009, 01:50 AM   #10
racer580
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Most of the wing is just for looks. The wrx wing is held by 4 bolts, when most people open the trunk they go straight for the wing to help them lift it and I always blow up at them for it because I noticed the bolts were getting weak, but I re-enforced them so its all good . If theres any wing thats going to do anything, its the STI wing, with its ridiculous 17 bolts! But im sure it uses all 17 bolts at over 85ish. It mainly helps keep the back stable at those high speeds, but in all honesty, when are you ever going to be going over 85ish as a DD, aside from the few track days
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Old 08-15-2009, 02:30 AM   #11
Chino Bling
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i noticed my average fuel economy increased 1 mpg when i went from the wrx wing to the sti wing. i'm not stating this as fact for every subaru with an sti wing. i'm just stating what i observed personally.
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Old 08-15-2009, 02:38 AM   #12
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Here is something that most people misunderstand about the STI wing.


The top element, is NOT there for downforce! (well, not directly)

Its the lower element that creates the downforce. The top element smoothes the flow off the back of the car for less drag, and helps direct flow onto the lower element, for the downforce. I dont recall where I saw it, but I want to say it was from testing by one of the japanese tuning companies, and they came up with the rear wing on the STI producing 85lbs of downforce at I think it was 65mph, and @140lbs at, I forget, I want to say like 125mph.

In the grand scheme of things, Although I am not an aerospace guy, or professional race car engineer, I would think that 85lbs of downforce at 65mph is next to nothing. Although I could definitely feel the difference with or without it at 85+
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Old 08-15-2009, 02:51 AM   #13
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Quote:
Originally Posted by Defiant Autospeed View Post
Here is something that most people misunderstand about the STI wing.


The top element, is NOT there for downforce! (well, not directly)

Its the lower element that creates the downforce. The top element smoothes the flow off the back of the car for less drag, and helps direct flow onto the lower element, for the downforce. I dont recall where I saw it, but I want to say it was from testing by one of the japanese tuning companies, and they came up with the rear wing on the STI producing 85lbs of downforce at I think it was 65mph, and @140lbs at, I forget, I want to say like 125mph.

In the grand scheme of things, Although I am not an aerospace guy, or professional race car engineer, I would think that 85lbs of downforce at 65mph is next to nothing. Although I could definitely feel the difference with or without it at 85+

85 pounds next to nothing??? hmm.. you must not know much about aerodynamics, drag, etc huh? thats a pretty good number.. not the best but pretty dang good...
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Old 08-18-2009, 08:19 PM   #14
paintbing
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Quote:
Originally Posted by 801_STi View Post
85 pounds next to nothing??? hmm.. you must not know much about aerodynamics, drag, etc huh? thats a pretty good number.. not the best but pretty dang good...
I too think 85 lbs is a lot of downforce. If you think about it, 85 lbs is going to be - say- spread across the rear wheels only. So let's say you now have 40 extra pounds of downward force on each rear tire.

The only way to really know how much this helps your car is by knowing the friction coeficient of the road surface and your type of tire. (I don't plan on doing the following, but I think it will help explain the dynamics with the extra downforce created) :

- Take your wheel/tire off the car and set it on the pavement surface you will be driving. Now pull the tire horizontally while keeping the tire surface as flat as possible. Measure the force it takes to slide(not roll) the tire across the pavement(as if you just lost traction and the car is sliding sideways). Now add a 40 lb weight to the tire and pull the tire again. It should be MORE than 40 additional lbs of force to move the tire.

Now if the tires were on slide pads(ie frozen lake) the extra downforce does jack squat. However if you're running at the Brickyard (grooved/diamond cut paving) that extra 85 lbs could 'maybe' prove to be worth up to ??500?? lbs or more of additional horizontal side force.

Just sayin'.
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Old 08-18-2009, 11:04 PM   #15
Bluefoton
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d000000000000d... just decide which look you like best, and decide whether you want the wing or not....
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Old 08-18-2009, 11:17 PM   #16
broosewee
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It might be a placebo effect, but the rear feels more "floaty" to me when it's wingless, so it kicks out (due to less grip) going around a corner. But, I have no scientific proof or anything...
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Old 08-19-2009, 04:59 AM   #17
dc_adio28
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+1 on lack of visibility from the sti wing
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Old 08-19-2009, 08:51 AM   #18
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If the car suffers from too much rear rotation in corners.....wing. If not....or if you're concerned with drag on straights, no wing. This may not be scientific, but it's how I've determined what I run. I have never had issues getting what I need from suspension and tire settings for cornering, so I tend to remove my wing.
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Old 08-19-2009, 09:04 AM   #19
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Quote:
Originally Posted by Jack ffr1846 View Post
If the car suffers from too much rear rotation in corners.....wing. If not....or if you're concerned with drag on straights, no wing. This may not be scientific, but it's how I've determined what I run. I have never had issues getting what I need from suspension and tire settings for cornering, so I tend to remove my wing.
Pretty simple and logical. I like it.

Dude, do you play guitar? Saw the Ernie Ball thing.
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Old 08-19-2009, 09:14 AM   #20
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It gets you noticed by the Po-Po.
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