Porsche 997 Suspension Tuning Lowering Springs

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Porsche 997 Suspension Tuning Lowering Springs

Neural Blog, 997TT Lowering Spring options

Porsche Turbo 997 Lowering Spring kit

Porsche Turbo 997 Lowering Spring kit

Porsche Turbo 997 TechArt Lowering Spring

Porsche Turbo 997 Sport Springs

Click images to enlarge.

The TechArt Lowering Spring kit is fully compatible with the Sport button (PASM) on on the 997, and will keep near stock ride quality and compliance for street

Porsche 997 Turbo Sport Lowering Springs by H&R

This is by far one of the cheapest options available, and generally would not come recomended for the hardened enthusiast. There have been quite a few occurances of drivers switching out of just the lowering spring option and into a full coilover system, such as the Bilstein Damptronic (equiped with PASM). However if you are in the market for just more an aggressive look then lowering springs may make more sense and are definately much cheaper than the alternative. Springs for the Porsche 997 Turbo (year 2006 to 2009) generally range in the $400 mark. Generaly they are responsible for a drop of around 1 inch

H&R Sport Springs (Part Number: 29111-1) offer the handling characteristics and aggressive appearance, without the harsh ride characteristics of less-advanced spring systems. H&R Sport Springs for the Porsche Turbo 997 feature more control and are engineered primarily for the street. H&R Sport Springs are made in Germany and crafted from a special 54iCr6 spring steel to ensure quality and performance.

TechArt Lowering Spring Kit For the 997 Turbo

TechArt lowering spring kits drop the car by 25mm (15mm w/ Sport suspension), just as the springs mentioned above, for more of an aggressive stance and somewhat better handling over the Porsche OEM setup.

The TechArt Lowering Spring kit is fully compatible with the Sport button (PASM) on on the 997, and will keep near stock ride quality and compliance for street use. Unlike some brands, these springs will not sag over time or cause the car to bounce on uneven roads. The TechArt kit is slightly "tighter" than the H&R spring kit. Some have described the ride quality to be a bit more harder, beter for more of a track tuned application over street. However still underperforms a full blown coilover system.

TechArt Lowering Springs for the Porsche 997 Turbo are priced in the $650 range. Checkout SHarkwerks for purchasing info http://www.sharkwerks.com/

GMG WC Sport lowering springs for 997TT

GMG recently introduced its "World Challenge" Sport Lowering spring sets for Porsche 997TT. These springs were designed and tested and developed with Eibach. Unlike most tuners who simply take an off the shelf lowering spring and rebrand it with their name, GMG choose to develop a completely new design with a focus on improving the handling of the Porsche 997TT and also improve the comfort and ride quality. These springs are also fully compatible with the Porsche Active Stability Management (PASM) dampers.

GMG's relationship has been very strong for many years through our World Challenge Motorsport program and as "tuning partner" both companies knew that they needed to come up with a spring design that would set the standard. After testing all the various manufacturers springs, they quickly discovered that the majority of the aftermarket and tuning spring companies who were making springs for the 997 Porsche Turbo were actually making the spring with softer rate to achieve the lowered ride height. While this achieves the desired look it does absolutely nothing for the performance of the vehicle and in most cases as with the 997TT it would have a negative effect on the vehicle handling making it worse than factory.

GMG started off by sending a stock set of dampers to Eibach, to be tested, to see what kind of spring rate they could produce while still maintaining reliability. The GMG spring utilizes a truly progressive step less pitch design that offered the lowered look while improving the handling and ride comfort of the vehicle. The GMG WC Sport Lowering Springs are designed to work with the factory shocks both in stock mode and sport mode.

These springs are priced around $695.00 per set http://www.gmgracing.com

GMG and TechArt lowering springs for 997TT

Both GMG and Techart use Eibach as our spring manufacturers. The spring material, spring rates and spring design that GMG and TechArt use are completely different than what Eibach uses for the general market.

The GMG WC springs are wound to specific specification. Other manufaturers simply rebrand their springs. Techarts design is exclusive to them just the same.

From over 8 different tuner and spring mnaufactures that were tested for comparisons, GMG have found that most of them actually use a softer spring rate than stock to achieve the lowered ride height. The only springs that offered a stiffer spring rate throughout the complete range of compression were in fact the Techart springs.

what exactly is a stepless progressive spring

GMG Spring vs. Bilstein Coilovers which is the better choice? The GMG spring is progressive, meaning initial response is soft, then the spring becomes stiff as it compresses more. While people's opinions vary, I've found that progressive spring is not necessarily the best solution. In addition, I don't think I would like this type of behavior, the initial softness of it. (Google "linear progressive spring" and read on your own if you are interested.) In contrast, the Bilstein is a stacked springs (linear main spring, plus tender tender) setup. A more advanced, costly, and desirable solution.

About Lowering

The law of physics implies this alone might be one of the most significant contributions to improved handling of your Porsche Turbo, besides stiffening. Lower is better, and since the cost is very cheap it may be more desirable for a quick fix. However drive quality may be affected negatively - another area where the Bilstein COilover System has clear advantage over the GMG Spring: ride height is adjustable.

Lowering and stiffening the car, there are 2 ways to do this: With coilover such as Bilstein, or lowering springs such as Techart, H&R, GMG. Among the springs, pay attention to the spring rates, no one wants to tell me the actual numbers but I believe H&R might be lower than stock, Techart and GMG are the stiffest.

Step Linear Springs (2 Step Linear Springs)

These are springs that have a 2 different spring rate.

In a two-step linear spring, about half the coils have shorter spacing. As the spring compresses, the coils move closer. At a certain point, the shorter spaced coils touch, effectively eliminating them from the spring. You then have a spring comprised of only the longer coils. This "second- step" spring will be much stiffer than the whole spring (the more coils, the easier it is to compress the spring). The result is that you have one set of handling characteristics before the shorter coils touch and then you have another, completely different level of response after they touch.

Linear springs are more often used in drag racing, road racing, track and races that require a "high spring rate", in which a constant spring rate is more important than a smooth ride. They are still popular because they are easier to produce and can be made to lower a car beyond the point of progressive springs.Easy to work with, because spring rate never changes, allowing quick chassis setupCheaper than progressive springs, allowing most race teams to use several different sets depending on track conditions

Progressive Springs (Rising Rate Springs, Progressive Rate Springs, Progressive Wound Springs)

In progressive springs each coil is spaced differently and have a variable spring rate. When free, it is easy to compress progressive springs for first centimeters. As you apply more forces, coil on a progressive spring come closer. After a certain point, coil at the top 1/4 of progressive springs begin to touch each other and finally become inactive or dead, and that makes the spring stiffer. Apply more forces to a progressive spring then it becomes stiffer because as the number of active coils in a spring decreases, the spring rate increases. So, progressive springs may both be sensitive to very small bumps on the road, while giving the stiffness you need during hard braking and turning.

Progressive springs are likely "all-in one" solutions. Progressive springs are often used on performance aftermarket kits like Eibach or others, and they are good for daily performance street driving. They help you achieve the highest performance when driving hard, while providing a smooth, comfortable drive the rest of the time.

Further suspension tuning improvements

We would obviously advise the best choice, price wise, is the bilsteing coilover suspension system for the 997 Turbo. Additionally to further improve the handling of your Porsche 997TT we would recommend a sway bar kit (like the OEM GT2 swaybar or GMG) which is a 3 way adjustable front and rear and fully compatible with stock drop links and which has no issues with front axle interference.

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