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Equipped with these Porsche 991 GT3 RS suspension upgrades, your 911 will brake, corner and accelerate on an entirely new level. The GT2 RS may have more power, but the GT3 RS’s superior aerodynamics and pin-sharp throttle response make it the track weapon of choice.
But this is only the beginning…
In this 991 GT3 RS suspension upgrades guide, we’ll reveal the critical flaws holding back the chassis’s true potential. We’ll also detail the suspension upgrades that fix them, and reveal the ultimate circuit handling package for trackday drivers.
991 GT3 RS Suspension & Handling Overview
Launched in March 2015, the 991.1 GT3 RS packs a four-litre, naturally aspirated flat-six developing 500hp and 480Nm of torque. This is linked to Porsche’s PDK dual-clutch automatic transmission and allows the 3RS to launch from 0-62mph in 3.3 seconds. A magnesium roof, plus carbon fibre engine cover and front luggage compartment lid shave 10kg from the GT3’s kerb weight; new optional forged wheels slash another 100kg.
As you would expect, the GT3 RS’s suspension is even more track focused than the GT3’s. As well as using solid rose joints on all links except that for the rear-axle steering, the RS runs stiffer springs plus helper springs for improved control. It also has wider track widths for a more planted stance, and aforementioned rear-wheel steering that is even more responsive than the GT3’s. The 20-inch front wheels are shod in 265/35 rubber while the rear 21-inch rims receive 325/30 tyres.
The mid-life update arrived in early 2018 and saw engine output rise to 520hp/470Nm, reducing the 0-62mph time to 3.2 seconds. The 991.2’s redline was also increased from 8,800rpm to 9,000rpm. Aerodynamic tweaks generated eight per cent more downforce, while further spring rate changes doubled down on the GT3 RS’s extreme nature.
GT3 RS Suspension Limitations
Although camber, caster, toe angle and ride height can be adjusted on the 991 GT3 RS, their range of adjustment is relatively limited. This means setup compromises are inevitable, affecting the overall driving experience and especially on-track performance.
Common criticisms of the 991 GT3 RS 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
Thankfully, the above issues can be fixed with bolt-on 991 GT3 RS suspension upgrades.
Common Handling Problems (And How to Fix Them)
The 991 GT3 RS suspension upgrades detailed in this guide achieve the following…
GT3 RS 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
With these changes implemented, the 991 GT3 RS will respond to inputs even more keenly while feeling even more stable and confidence-inspiring. That means great things for lap times and driver enjoyment.
Porsche 991 GT3 RS 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 a GT3 RS 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 Suspension Upgrades for Porsche 991 GT3 RS
This section covers essential Porsche 911 GT3 RS suspension upgrades that deliver enormous handling improvements with minimal compromise. These upgrades form the basis of the Suspension Secrets Circuit Handling Package and are the ideal starting point for both road and track-focused builds.
Camber Caster Plate Top Mounts
A lack of factory camber adjustment is the primary cause of the 991 GT3 RS’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 RS 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 RS suspension offers more than average rear camber adjustment as standard. However, for more aggressive setups you’ll need camber shims.
991 GT3 RS 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 RS and can be stacked or staggered to create a camber setting that suits your needs.
Complete GT3 RS Suspension Package
The 991 GT3 RS front camber plates and rear camber shims described above are a great starting point for improved handling. For drivers wanting even greater handling performance on track, we recommend investing in a comprehensive bolt-on suspension package like the 991 GT3 RS Kinematics Kit described below…
Circuit Handling Pack Kinematics Kit
Designed to address the 991 GT3 RS’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 RS 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 RS 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 RS 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 RS Rear Upper Control Arm Monoball Kit (1), Lower Control Arm Monoballs (2) and Solid Control Arm Bushes (3).
Best for: Trackday driving
991 GT3 RS 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 RS 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 RS seat raisers are particularly useful if your Porsche is not equipped with harnesses.
Uprated Dampers
Most Porsche 991 GT3 RS 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 RS, the original dampers - and especially those fitted to the 991.1 GT3 RS - 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 RS 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 RS 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 RS Suspension FAQ
What are the main suspension weaknesses of the 991 GT3 RS?
Despite being very track focused, the 991 GT3 RS has limited camber and caster adjustment, bump-steer when lowered, and a narrow damper tuning range, which can hold back ultimate grip and precision.
Which suspension upgrades make the biggest difference on a GT3 RS?
Adjustable camber and caster plates, rear camber shims, geometry correction parts, solid bushes, and uprated dampers deliver the largest improvements in grip, steering response and stability.
Do I need a wheel alignment after fitting GT3 RS suspension upgrades?
Yes. A full geometry setup is essential to get the best from any suspension upgrades, improving cornering grip, braking stability, steering feel and tyre life.
Are these upgrades suitable for road use as well as track driving?
Many are ideal for fast road driving, improving control and feedback, while others - such as solid bushes and performance dampers - are best suited to regular track use.
What’s the best all-in-one suspension package for the 991 GT3 RS?
A complete kinematics kit combining camber plates, springs, bump-steer correction and rear camber shims offers the biggest handling transformation for fast road and circuit driving.
Tested and developed by Suspension Secrets through extensive road and track evaluation, the GT3 RS suspension upgrades described above unlock an entirely new level of handling performance. By correcting factory understeer, improving tyre wear, and enhancing braking stability, these suspension modifications transform the 991 GT3 RS into an even more focused and confidence-inspiring driver’s car.