AQM GT4 Wing Risers

 
The Issue

When the GT4 is being pushed to the limit, we found the car doesn't feel very stable or promote much confidence in the higher speed corners, especially with street tires. The underlying issue stems from the rather unsophisticated strut style rear suspension (see our GT4 Multi Link Rear Suspension Kit for more details). Sufficient downforce would help offset this weak point on the GT4, although the factory wing is mounted quite low (mostly for cosmetic appeal, and for good reason as it certainly looks great!). However, on most tracks in a street car there are very few corners you take at over 100mph. Most of them around 70-90mph, some in the low 100s, and the outliers in the mid-high 100s. The GT4 has a rather weak amount of downforce of about 30-40lbs, which isn't sufficient for most track conditions in which this car is being used. Therefore, we set to task improving the downforce of the car. 
 
The Solution
Generally speaking, Porsche makes a very good wing in itself. They are quite aerodynamically efficient from both a downforce and drag perspective, and the GT4's factory wing is no exception. Therefore, instead of pursuing a larger wing, we tested the benefits of maximizing the use of the existing wing by changing its height. In its low factory mounting point the wing uses very little of its overall potential due to the height difference of the roofline and the wing, as much of the air stream is blocked by the body of the car. The actual surface area of the wing being effectively used is very low, mostly on the outer portions. As you raise the wing higher with our wing risers, it allows access to more clean air and increases the amount of surface area being effectively used towards the wing's center. The higher you raise the wing the more downforce you add, accessing more unrestricted airflow while keeping conscious of the structural integrity of the wing. On that basis, we designed 2in, 4in and 6in wing risers for the factory wing for testing purposes. We went to Sebring and Road America, easily switching them out in minutes with a variety of different GT4s/Clubsports and drivers throughout the season. Downforce was tested the old fashion way...how the car felt through the corners, particularly at Sebring through the Bishops at 125-130mph.
 
The Results

The 6in risers were the winner, there is a noticeable improvement in the GT4 hunkering down throughout the track from increased downforce. The car is much more planted, secure, and confidence inspiring through the higher speed corners. Some other interesting feedback...for those of you who don't know, the GT4 comes with blocks installed in the front diffuser from factory. We found no noticeable benefit from these blocks being removed in the various testing sessions with the factory wing height or the smaller risers, that is until the 6in risers were installed. At that point, the diffuser blocks removed offered a noticeable compliment in front downforce to the increased rear downforce from our 6in risers. All else equal, a standard GT4 with our wing risers, front diffuser blocks removed and running our Gurney Flap had noticeably more grip than that of a GT4 Clubsport running without them. There is no doubt our wing risers provide a noticeable benefit to the downforce/handling of the car, offering a great bang for the buck improvement.

The cherry on top...when you look in the rearview mirror, the wing has been relocated high enough for near perfect rear visibility and improved situational awareness on and off the track.

Product Information

 
  • Made of Stainless Steel
  • Mounting Hardware Included
  • Rounded Edges and Crinkle Finish (to match the black factory risers as closely as possible)
 
Pricing
 
$398 per pair
 
Contact Information

Please feel free to email/call me at my contact information below with any questions or inquiries. It would be a pleasure to work with you to meet your goals, and have you join the growing AutoQuest community : )

 
John Gaydos
Cell: 484 883 6197 (text available)
Work: 239 432 1700
Email: john@autoquestms.com
 
Photos

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