EVO Aerodynamics Review
Wow - Awesome thread.
http://www.autovation.net/groupbuy/M.../splitter.html
I also found this Autovation front splitter and was wondering if its any good - it does not seem to be as large as the APR covering the span of the bumper. I am thinking the APR is a little step above the Autovation based on the design?
http://www.autovation.net/groupbuy/M.../splitter.html
I also found this Autovation front splitter and was wondering if its any good - it does not seem to be as large as the APR covering the span of the bumper. I am thinking the APR is a little step above the Autovation based on the design?
doesn't seem to me like the Autovation splitter is mounted in the optimal location because it sits between the lower lip and bumper. so the lower lip could interrupt air flow under the slipper because it's not flat. just my opinion.
i'm sure it still functional in separating high pressure and low pressure air.
i'm sure it still functional in separating high pressure and low pressure air.
doesn't seem to me like the Autovation splitter is mounted in the optimal location because it sits between the lower lip and bumper. so the lower lip could interrupt air flow under the slipper because it's not flat. just my opinion.
i'm sure it still functional in separating high pressure and low pressure air.
i'm sure it still functional in separating high pressure and low pressure air.
This is, however, just a splitter. You would run it with the stock undertray. I think I would run the Autovation splitter with stock undertray before I would run an off-the-shelf APR splitter/undertray. Plus, the Autovation is only $200. Can't beat that!
Recently posted a quick Aero review to my blog (in my sig). Figured I could share it here as well:
I spent a LOT of time over the winter researching Aero. Wings, Splitters, Diffusers, Canards, etc. A lot of the research came from this thread with the help of others that have ran specific aero pieces, vendors, guesses, etc. And I still feel like I have a very miniscule knowledge on the subject.
It also seems like there are a lot of people that offer advice that they can't confirm (elsewhere on the internet especially; but it happens on our forums too) - mostly because they are churning out the same supposed 'expert' principles they've read somewhere on the internet and never tested anything themselves. So likewise; take my testing and feedback with a grain of salt as well...
So, I took the knowledge I could get and decided to test some on my own. I've ran my Evo completely stock with regards to aero since I got it through the end of the 2010 season. It's really pretty well balanced in sweepers with regard to predictability; there was always always understeer until I got the Shep Racing 1.5 way rear diff (one of the best upgrades ever btw). Now if you upset it, it'll push or come around but there's no crazy snap oversteer or understeer at least with any of the suspension setups I've ran (5 in total).
In balancing a few factors including $, NASA 'modification' points, balance and ease of assembly. In the end, I found a better solution for me. I found another Evo owner selling his APR GTC-200 wing with extensions and APR front wind splitter. I had personally seen this car with the items on it and new the quality and fitment was going to be good. I figure this was a good option that'll mount up without fab needed on my behalf, and if I don't like it, it's not like I'm out 1000's. I nicknamed this 'Config #1'.
There's only some much tracktime I can get in a year so you can't isolate everything!
I did get to run 1 session at Mid Ohio with no wing at all! That was beneficial in feeling how no wing felt in combination with the front splitter. My instant conclusion was the rear wing helped but it wasn't making as huge a difference as I had thought. Well either that or the splitter was just effing everything up and actually creating lift instead of downforce. Either way; I did manage to break the Mid Ohio Club Course track record.
Fortunately I was to run full speed at Autobahn at my last event and have some good comparable times with the aero. My goal was to run it the first day, then run a 'config #2' the 2nd day. But we were completely rained and snowed out the first day; so I had to stick with on Sunday to get my initial comparisons. Again, the car wasn't bad or anything, I did manage to break the track record - it was actually my record from 2010 - by .9 seconds.
So with a full month between events, we've got had some time to collect our thoughts, regroup, plan & attack. Next event is May 14/15th at Putnam... Hopefully I'll have some good feedback after that event.
I spent a LOT of time over the winter researching Aero. Wings, Splitters, Diffusers, Canards, etc. A lot of the research came from this thread with the help of others that have ran specific aero pieces, vendors, guesses, etc. And I still feel like I have a very miniscule knowledge on the subject.
It also seems like there are a lot of people that offer advice that they can't confirm (elsewhere on the internet especially; but it happens on our forums too) - mostly because they are churning out the same supposed 'expert' principles they've read somewhere on the internet and never tested anything themselves. So likewise; take my testing and feedback with a grain of salt as well...
So, I took the knowledge I could get and decided to test some on my own. I've ran my Evo completely stock with regards to aero since I got it through the end of the 2010 season. It's really pretty well balanced in sweepers with regard to predictability; there was always always understeer until I got the Shep Racing 1.5 way rear diff (one of the best upgrades ever btw). Now if you upset it, it'll push or come around but there's no crazy snap oversteer or understeer at least with any of the suspension setups I've ran (5 in total).
In balancing a few factors including $, NASA 'modification' points, balance and ease of assembly. In the end, I found a better solution for me. I found another Evo owner selling his APR GTC-200 wing with extensions and APR front wind splitter. I had personally seen this car with the items on it and new the quality and fitment was going to be good. I figure this was a good option that'll mount up without fab needed on my behalf, and if I don't like it, it's not like I'm out 1000's. I nicknamed this 'Config #1'.
Track Testing - The Fun Part!
After running 6 days with this setup, I feel I've had enough seattime to make some logical conclusions. The sucky part is 3 were at a new track; 1 day was all rainy and all of this was with a brand new suspension and alignment. There's only some much tracktime I can get in a year so you can't isolate everything!
I did get to run 1 session at Mid Ohio with no wing at all! That was beneficial in feeling how no wing felt in combination with the front splitter. My instant conclusion was the rear wing helped but it wasn't making as huge a difference as I had thought. Well either that or the splitter was just effing everything up and actually creating lift instead of downforce. Either way; I did manage to break the Mid Ohio Club Course track record.
Fortunately I was to run full speed at Autobahn at my last event and have some good comparable times with the aero. My goal was to run it the first day, then run a 'config #2' the 2nd day. But we were completely rained and snowed out the first day; so I had to stick with on Sunday to get my initial comparisons. Again, the car wasn't bad or anything, I did manage to break the track record - it was actually my record from 2010 - by .9 seconds.
So with a full month between events, we've got had some time to collect our thoughts, regroup, plan & attack. Next event is May 14/15th at Putnam... Hopefully I'll have some good feedback after that event.
Last edited by boomn29; May 11, 2011 at 07:53 AM.
the problem i see with mounting a flat splitter directly under the oem lip of Evo IX and Evo X is that the splitter will angle upward at the front. so you would have to make an air dam and bring the front of the splitter down to make it level. but according to NASA TT rules, that would be and additional 3 points for front fascia upgrade. so we need to figure out a way to mount the splitter level without adding a front air dam.
i just removed some mods from my car to gain back 3 points so i can install a front splitter.
i just removed some mods from my car to gain back 3 points so i can install a front splitter.
the problem i see with mounting a flat splitter directly under the oem lip of Evo IX and Evo X is that the splitter will angle upward at the front. so you would have to make an air dam and bring the front of the splitter down to make it level. but according to NASA TT rules, that would be and additional 3 points for front fascia upgrade. so we need to figure out a way to mount the splitter level without adding a front air dam.
i just removed some mods from my car to gain back 3 points so i can install a front splitter.
i just removed some mods from my car to gain back 3 points so i can install a front splitter.
Depending on how my event goes this weekend; I could be selling the splitter and going a different route.
Evolved Member
Joined: Aug 2008
Posts: 785
Likes: 3
From: Atlanta, GA
Great thread!! I will be doing some mock up front splitter designs this weekend. After I swing by NASA's event at Road Atlanta for some ideas! It might take a while with my budget, but I will post my efforts and future results.
Kognition Wing
Wanted to share the details on my new wing. I previously ran an APR GTC-200 with the extension mounts. I decided to go bigger.
Enter the 68" span of the Kognition! It's adjustable (and marked) for everything from 5 to 18 degrees! I've ran it from 5-9 degrees already and can tell a big difference.
I mentioned I did not feel much of a difference with the APR wing, even with the extensions. I debated on buying their 'gurney flap' to create some additional downforce with a lip on the rear of the wing, but I came across a good deal with Kognition and I jumped on it. Here's some comparison shots - and yeah it's massively bigger!
And installed:
Enter the 68" span of the Kognition! It's adjustable (and marked) for everything from 5 to 18 degrees! I've ran it from 5-9 degrees already and can tell a big difference.
I mentioned I did not feel much of a difference with the APR wing, even with the extensions. I debated on buying their 'gurney flap' to create some additional downforce with a lip on the rear of the wing, but I came across a good deal with Kognition and I jumped on it. Here's some comparison shots - and yeah it's massively bigger!
And installed:
I should be revisiting 2 tracks later this year that I already ran in the APR wing. Setups won't be exactly the same, but it'll be close. What I'm most interested in, is if the huge Kognition wing slowing me down on the long straights? That much I can track.