AQM GT4 Carbon Fiber Gurney Flap

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 with our Wing Risers and adding a Gurney Flap. Downforce was tested the old fashion the car felt through the corners by experienced drivers, particularly at Sebring through the Bishops at 125-130mph.

The Results

There is a noticeable improvement in the GT4 hunkering down throughout the track from increased downforce resulting from our Gurney Flap coupled with our Wing Risers. 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 our 6in Wing 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 Gurney Flap and Wing Risers and the front diffuser blocks removed had noticeably more grip than that of a GT4 Clubsport running without them. There is no doubt this combination of our aero products provides a noticeable benefit to the downforce/handling of the car, offering a great bang for the buck improvement.
The cherry on top...the Gurney Flap looks Great! : )

$398 per unit
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


Let's Chat : )

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