SKU: SKU: ClearUS-GRM098009
Condition on THIS Clearance Item:Open Box
Clearance Items Purchase Disclaimer:
1. Final Sale Policy: All clearance items are sold as final sale. No returns, refunds, or exchanges are permitted under any circumstances.
2. Processing Time: Allow up to 2 days for processing clearance items. Do not visit the store to pick up a clearance item unless you have placed an order and received confirmation that it is ready for pickup.
3. Shipping Costs: Clearance items do not qualify for free shipping. If you require shipping, you can request a quote before making a purchase or receive a quote after placing your order. Should you find the shipping cost too high after purchase, you may cancel the order with a 15% restocking fee. No exceptions will be made.
4. Buyer's Responsibility: While we have categorized clearance items diligently, it is the buyer's responsibility to ensure the compatibility of the part number with your vehicle. Please research the part number on the manufacturer's website. Raptor Racing will not be held responsible for any incompatibility issues.
5. Warranty Information: There is no warranty on clearance items that are open-box or have scratches and dents. Brand new items have a manufacturer's warranty, but Raptor Racing will not assist with any warranty issues on clearance items.
6. Inventory Updates: In case an item is out of stock after purchase due to inventory discrepancies, an immediate refund will be issued. If an item is marked as "out of stock," it is not available for purchase.
Please ensure you have read and understood these terms before purchasing clearance items.
You’ve probably read somewhere on the internet that a strut tower brace never does anything but look pretty. You’re about to read otherwise. Armed with a strong background in vehicle dynamics and chassis design, we’ve spent months understanding the BRZ/FRS/86 chassis, testing different designs, collecting data and measuring performance. With the help of the FT86Club community, we’ve developed a strut tower brace that works.
Our design requirements for this project were simple. The GrimmSpeed Strut Tower Brace must provide additional stiffness between the strut towers, enhancing stability and sharpening steering response. We began with testing both on the street and by statically flexing the chassis in the shop. Tweaking the chassis manually and using our FARO Arm to plot critical points in CAD, we were able to identify the weak points in the system. What we found was interesting. The OEM triangulation bars actually function very well. So, while the allure of a beautiful 3-point brace was tempting, the data spoke loud and clear: a simple 2-point brace was the right solution. With that, we set out to create a clean, simple and cost effective solution.
Using 3D scanned data from multiple vehicles, we were able to quantify the manufacturing tolerances and design our brace accordingly. What that means for you is a perfect fit and easy installation. 3D-printed prototypes helped speed the development cycle and allowed us to test a number of different bracket designs for fitment and aesthetics.
One key design decision was to utilize a rigid, welded construction. The reasons for this are three-fold, but what it boils down to is the old standby, ‘Keep It Simple, Stupid’. When the goal is to reduce compliance in the system, it’s not hard to understand why a solid form design is best.
End brackets are laser cut from 3/16" steel and precision CNC bent. These brackets were sized to provide maximum strength and stiffness without compromising thread engagement with the vehicle. Cross tubes are CNC laser cut to length from .125in wall tubing. Mild steel, being both the viable material that is both economical as well as the well-suited for the job, was an easy choice. Contrary to popular belief, mild steel offers greater stiffness than stainless steel and while stainless steel offers higher yield strength, in this particular application, we’re nowhere near those types of forces. The assemblies are all robotically welded in the same fixture for unbeatable accuracy and repeatability. Each finished brace is coated with a durable DuPont textured powdercoating. The cherry on top, so to speak, is that we’ve laser cut the GS logos from stainless steel, so you’re free to polish the coating off of it for a unique look without worry about rust.
Performance metrics, both quantitative and qualitative were carefully tracked through development and following production. In our slalom testing, peak deflection between the strut towers dropped from .180in to .030in, a decrease of 83.3%. Even more notable than the lowering of deflection was the substantial decrease in ‘noise’ within the data. You can truly feel this improvement the first time you leave your driveway after the install. Expect an immediate and noticeable decrease in NVH and a noticeable increase in sharpness and steering feel. The chart below shows strut tower deflection through a series of slalom turns before and after the installation of the GrimmSpeed Strut Tower Brace. What you see is that without the brace, the data shows a great deal of noise and unpredictable deflection, indicating an unsettled chassis. After installation of the brace, noise in the data is greatly decreased and behavior is much more predictable. With the brace installed, the chassis reacts as you would expect, cycling between tension and compression as the brace works to maintain stiffness between the strut towers through the slalom.