perrin stiffies what are they for and do they look cool? - Subaru WRX Forum
  • 1 Post By arcticscythe
LinkBack Thread Tools Display Modes
post #1 of 4 Old 05-09-2014, 02:38 PM Thread Starter
WRXtuners Member
385STI06's Avatar
Join Date: Mar 2014
Posts: 61
385STI06 is an unknown
perrin stiffies what are they for and do they look cool?

I have a 2006 sti and iv seen people have the stiffies iv heard they where for performance others say their wing wobbled so they needed it well thats why im asking i think they look cool and i cant seem to find a how to install video any tips or write up
385STI06 is offline  
Sponsored Links
post #2 of 4 Old 05-09-2014, 06:57 PM
WRXtuners Member
arcticscythe's Avatar
Join Date: Dec 2013
Location: California
Posts: 1,540
arcticscythe is known to be trustworthy and helpful arcticscythe is known to be trustworthy and helpful arcticscythe is known to be trustworthy and helpful
If you like the look then go for it. the OEM wing doesnt provide a huge amount of down force to begin with (50-100lbs at speed) so as long as your not covering the slot with a sail you shouldn't see any performance swing in either direction.

The theory behind the stiffies is that when you are driving at speed your spoiler will be providing down force that may be greater than the material rigidity of the fiberglass/poly/plastic of the OEM wing. If you were to put 100lbs of sandbags across the top of the spoiler it would flex a bit. the stiffies would stop that flex. The design of the OEM wing allows for a large expanse of open space to allow for a smooth aerodynamic performance but on some vehicles the down-force can cause unwanted and even visible in the rear view mirror flex.

When people talk about wing wobble that is typically a function of worn or damaged mounting hardware. Adding braces to your wing wont correct for damaged mounts. If your wing is not attached correctly i would look into the mounting hardware.

I say go for it, Kinda like decals its what makes your car unique, If you like them then they are well worth the 40-50 dollars : )
BLAZE2099 likes this.

- Jason
Slow is Smooth > Smooth is Fast
arcticscythe is offline  
post #3 of 4 Old 06-03-2014, 11:53 PM
WRXtuners Member
SuBeast's Avatar
Join Date: Oct 2007
Location: California
Posts: 731
Images: 3
SuBeast is on thin ice
Send a message via AIM to SuBeast
The STi spoiler flexes in the top center at speed like the highway, you can't really see it yourself while driving but my friends have said they notice it driving behind me, it doesn't have to do with damage mounts. What mount? It bolts directly into the trunk Lol. With a ton of studs and nuts, I don't see how that can make the wing have flex...

And the stiffis would stop it from "bouncing" or flexing, because the flexing would cause inconsistencies in airflow at higher speeds. At least that's my theory on them. As for whether they look cool is up to your preference.. I'd bet 90% of the buyers get them for looks anyways.

Pick 2
2006 STi
1990 Civic time-attack project
1990 Toyota Hilux - daily
SuBeast is offline  
Sponsored Links
post #4 of 4 Old 06-04-2014, 03:21 PM
mosc's Avatar
Join Date: Mar 2005
Location: Pennsylvania
Posts: 6,808
Images: 7
mosc is known to be trustworthy and helpful mosc is known to be trustworthy and helpful
The 04-14 STi wing is purely cosmetic. It provides downforce only at high speeds but also adds drag enough to counteract the added downforce anyway. At freeway speeds (50-100mph), it's just a gas mileage sucking eyesore.

2015 STi: Still Stock
04 STi, 04 WRX: SOLD
mosc is offline  

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome