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There are a range of Porsche 911 GT3 suspension upgrades that transform the handling of this iconic machine. The 991-generation car is bigger and heavier than its 997 predecessor, and many owners feel it sacrificed dynamic ability for improved comfort.
In this 991 GT3 suspension upgrades guide, we’ll detail the car’s handling weaknesses and reveal the best modifications for fixing them, including handling packages from Suspension Secrets.
991 GT3 Suspension & Handling Overview
The 991 generation may have advanced the 911 breed in many areas, but plenty of drivers missed the preceding 997’s hydraulic steering system, for example, which offered more feedback than the new electro-mechanical setup. The 991’s additional size and weight arguably blunted handling dynamics, too.
Arriving in 2013, the 991 GT3 boasted a 3.8-litre, non-Mezger, flat-six engine producing 450hp. Transmission was seven-speed PDK dual-clutch, and rear-wheel steering featured for the first time. The suspension comprised stiffer-mounted MacPherson struts with adjustable camber and toe, while the rear was multi-link.
PASM adaptive dampers offered Normal and Sport modes, while high-rate springs and monoball bearings improved precision over lesser variants. These were teamed with adjustable anti-roll bars and a 20 to 30mm drop in ride height. The standard 20-inch wheels were wrapped in 245/35 and 305/30 rubber at the front and rear respectively.
In the spring of 2017, Porsche announced the 991.2 version of the GT3. The model’s new, four-litre flat-six produced 500hp and revved to 9,000rpm. A six-speed manual gearbox was offered as an option, while the PDK boasted faster shifts. Aerodynamic changes increased downforce levels and lighter wheels were made available.
GT3 Suspension Limitations
The 991 GT3 suspension boasts greater ranges of adjustment than the average car (including camber, caster, toe angle and ride height). However, the standard setup is still relatively limited in scope - especially if you want to apply more aggressive suspension settings for track work.
Common criticisms of the 991 GT3 chassis include:
- Limited camber adjustment
- Insufficient caster angle
- Bump-steer issues when the car is lowered
- Rear-wheel steering system complexity
- Limited damper adjustment range
These issues ultimately affect handling performance, driver enjoyment and lap times on circuit. Thankfully, they can all be fixed with bolt-on 991 GT3 suspension upgrades.
GT3 Handling Problems (And How To Fix Them)
With the 991 GT3 suspension upgrades detailed below, you can achieve the following…
GT3 suspension fixes
1. Increased front camber to reduce understeer
2. Improved rear toe control to enhance traction
3. Lowered centre of gravity to reduce pitch and roll
4. Corrected geometry to enhance precision
5. Increased damper efficiency and adjustment range
All combined, the upgrades below dramatically improve how the 991 GT3 suspension operates, enhancing cornering grip, traction, braking stability and precision on the road and track.
Porsche 991 GT3 Suspension Geometry & Alignment Setup (Top Tip)
A full suspension geometry alignment is essential after installing new suspension parts. By correctly adjusting camber, toe, and caster (where available), alignment ensures you maximise grip, stability, and tyre life.
Benefits of Proper 911 GT3 Geometry Setup
- Sharper steering response
- Increased cornering grip
- Improved rear traction
- Enhanced braking stability
A professional alignment is the single most cost-effective handling upgrade you can make.
Essential GT3 Suspension Upgrades
This section covers essential Porsche 911 GT3 suspension upgrades that deliver the greatest handling improvements with minimal compromise. These upgrades form the basis of Suspension Secrets handling packages and are the ideal starting point for both road and track-focused builds.
Camber Caster Plate / Front Top Mounts
A lack of factory camber adjustment is the primary cause of the 991 GT3’s mid-corner understeer.
Adjustable camber plates allow additional negative camber to be dialled in, significantly improving front-end grip and steering feel.
Why 991 GT3 Camber Plates Matter
- Reduce understeer
- Sharpen turn-in
- Increase steering feedback
- Improve tyre wear on track
Suspension Secrets Adjustable Camber & Caster Plates also increase caster angle, providing dynamic camber gain as steering lock is applied. These camber plates are fully compatible with OEM dampers and PASM.
Rear Camber Shim Kit
The Porsche 991 GT3 suspension setup does not offer enough rear camber adjustment as standard. This is why you need camber shims.
991 GT3 Rear Camber Shims Benefits
- Increased negative camber on the rear axle
- Improved mid-corner and corner-exit traction
- Increased cornering speeds
- Added transitional stability
- Greatly reduced tyre wear
Camber shims are easy to install on the rear axle of the 991 GT3 and can be stacked or staggered to create a camber setting that suits your needs.
Complete GT3 Suspension Package
The 991 GT3 front camber plates and rear camber shims described above are a great starting point for improved handling. For drivers wanting even greater handling performance for serious track work, we recommend investing in a comprehensive bolt-on suspension package like the 991 GT3 Kinematics Kit described below…
Circuit Handling Pack Kinematics Kit
Designed to address the 991 GT3’s suspension limitations, the Circuit Handling Pack Kinematics Kit from Suspension Secrets maximises grip, ensures the full contact patch of the tyre is utilised during hard driving, and substantially improves chassis balance.
991 GT3 Kinematics Kit Includes:
- Top mounts with increased camber and caster
- Custom Eibach front springs with increased (stiffer) spring rate
- Spring cups to reset damper bump-to-droop ratio
- Bump-steer tie rod ends
- Rear camber shim kit
This package increases mid-corner grip and steering feel, greatly reduces understeer, removes bump-steer, and makes the steering more accurate. The kit also increases braking stability by reducing nose diving under heavy braking, and provides more neutral chassis balance.
Best for: Fast road and track use
Solid Bushes & Pucks
The Porsche 991.1 and 991.2 GT3 are outstanding driver’s cars, but from the factory they still rely on rubber suspension bushes designed to balance performance with road comfort. When pushed hard - particularly through fast corners and under heavy braking - these bushes flex, allowing small but significant changes in suspension geometry. This leads to a slight softness in response, reduced steering clarity and a loss of consistency at the limit.
Suspension Secrets solid control arm bushes and monoball upgrades replace the original rubber components with billet aluminium housings and motorsport-grade spherical bearings. By eliminating unwanted compliance, camber and toe remain stable under load, and forces are transferred directly into the chassis. The result is sharper steering, improved braking stability, stronger rear-end grip and a much more connected feel - allowing the GT3 to perform with the precision its chassis was designed for.
Solid bushes - key benefits
- Sharper, more accurate steering response
- Improved chassis rigidity and rear axle stability
- Consistent suspension geometry under load
- Greater braking confidence and control
- Increased cornering grip and traction
- Faster response to driver inputs
- Reduced understeer
Pictured are the 991 GT3 Rear Upper Control Arm Monoball Kit (1), Lower Control Arm Monoballs (2) and Solid Control Arm Bushes (3).
Best for: Driving on track
991 GT3 Seat Raisers
Seating position is often overlooked and many owners assume the factory Porsche seats are as good as it gets. However, as 991 GT3 suspension upgrades are installed and cornering G-forces increase, the standard range of seat adjustment becomes an issue.
Seat raisers by Suspension Secrets increase the recline angle of your seat and accentuate the bucket shape, holding you more firmly in place. This allows you to concentrate on brake pedal modulation and steering inputs. 991 GT3 seat raisers are particularly useful if your Porsche is not equipped with harnesses.
Uprated Dampers & Coilovers
Most Porsche 991 GT3 owners only consider uprated dampers once they begin attending trackdays and pushing the car beyond fast road driving. While the factory suspension setup performs well on the road, particularly on the 991.2 GT3, the original dampers - and especially those fitted to the 991.1 GT3 - can struggle with sustained heat, repeated heavy braking and high cornering loads on circuit. This can lead to reduced damping control, softer response and less consistent handling performance.
Aftermarket dampers and coilovers suspension kits for the 991 GT3 reduce excessive body movements during fast cornering and hard braking. They achieve this with stiffer springs than what’s installed at the factory, and optimised valving that dampens oscillations more effectively. This setup provides the tyres with an increased quality of contact with the road or track surface, to the benefit of grip, response and lap time.
Aftermarket coilovers and dampers are made of higher quality materials than factory hardware, increasing overall reliability and making them ideal for the harsh world of track driving.
For the 991 GT3 we recommend Nitron R1 Coilovers with 2-way adjustment, Nitron R3 Coilovers with 3-way adjustment, and KW V4 Clubsport Coilovers with 3-way adjustment.
Porsche 991 GT3 Suspension FAQs
What are the main handling issues with the Porsche 991 GT3 suspension?
The 991 GT3 is very capable, but the factory setup limits camber and caster adjustment, can introduce bump-steer when lowered, and uses rubber bushes that flex under load. This often leads to understeer and reduced steering feel when driving hard.
Which suspension upgrades improve a 991 GT3 the most?
The biggest gains come from adjustable camber and caster plates, rear camber shims, corrected geometry parts, solid bushes or monoballs, and uprated dampers or coilovers. Together, they sharpen steering, boost grip and improve overall control.
Is a geometry alignment needed after fitting suspension upgrades?
Yes - it’s essential. A proper alignment ensures camber, toe and caster are set correctly, improving grip, stability, braking confidence and tyre life. It’s one of the best value handling upgrades you can make.
Are these suspension upgrades suitable for everyday driving?
Yes. Many upgrades improve ride control and steering feel on the road while also delivering big benefits on track, making the car more precise, stable and enjoyable in all conditions.
Tested and developed by Suspension Secrets through extensive road and track evaluation, these upgrades unlock enhanced handling performance from the Porsche 991 GT3 chassis.