This article is Work In Progress 
Introduction
This article will cover basic information about the Honda Jazz/Fit suspension system. I will look at various options out there for the car, as well as ways to upgrade and make better use of the suspension system. I will include links to manufactors and try to compile a list of applications with prices.
The Honda Jazz/Fit suspension system is a fairly simple one. Both the GD1 and thd GD3 suspensions use the same components, but the GD3 (The VTi and VTi-S) have slightly stiffer springrates.
The Jazz/Fit suspension system consist of Shock Absorbers, Springs, Bushings, Control Arms and Suspension Linkage.
Why Would I Want To Modify The Suspension?
The most common reason is lowering. Lowering the ride-height changes the way the car handles on the road, and gives a more direct feel to the steering and handling, simply because the distance the spring travels is shortened. Some drivers think it gives a "cooler" look to the car, putting it closer to the ground.
Handling is the primary reason for wanting to change the stock suspension system. The Honda Jazz/Fit is a city car, and meant to be a normal daily driver for the entire family. Its stock suspension, even on the VTi models, is pretty soft. This elevates the comfort of the ride, but sacrifices the handling. Like most stock suspension systems, it’s a compromise between comfort and handling.
Lowering Your Jazz
If all you want to do is to give your Jazz/Fit a lowering, you don't need to change anything but the spring itself. There are two types of springs to choose from. The normal spiral spring which is the same type that is used on the stock suspension, or Progressive Springs. Although the Jazz/Fit may be lowered up to 7 centimetres (cm), it is not recommended to lower more then 2.5 cm to 4 cm. If you lower the ride more then 4 cm, you will need to alter the angle of the camber to compensate for the change in ride height.
The most common choice is just the plain spiral springs. The reason is simply because they cost less, and offer easy lowering. The best choice is the use of a Progressive Spring, which in addition to lowering also improves the stiffness and handling of the car. A Progressive Spring will become harder and harder the more it is compressed. This way, it will feel soft on the daily driving road, but give a stiffer handling for the sportier driving. The Progressive Springs cost a bit more, but in my opinion it's worth the money!
Coilovers
The ultimate suspension upgrade for any street or track car is a Coilover system. A Coilover system offers a complete Damper/Spring package, and the system has been adjusted so that the Damper and Spring fulfil each others - thus giving the perfect ride height and stiffness. If you take your car to the track from time to time, or just like to have the best performing suspension regardless of street driving or track driving - this is the way to go.
Most Coilover Systems offers height adjusting - but the more exclusive ones offer adjustable stiffness as well. Coilovers offer awesome drivability and handling for your Jazz/Fit - but it is also the most expensive way to upgrade your suspension.
Manufactors of Suspension Upgrades for Honda Jazz/Fit
This is a list of producers and their systems for the Jazz. I will try to include as much information as possible, and add information as it presents itself.
Tein
Tein has been making suspension parts for Honda for ages, and have a well-earned repubtation. Read more about Tein Here!
S.Tech Springs
Tein S.Tech Spring is an excellent step towards suspension tuning. They offer approximately a 1.5 inch drop for a more aggressive appearance. Comes with a 1 year limited warranty. Spring length is guaranteed not to sag more than 5mm and to be clear of any manufacture defects (see limited warranty for more details).
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GD1 and GD3: Part number
SKA04-S1B00 - Springrate Front/Rear: ~ 2.2k / ~ 2.5k - Lowering Front / Rear: -40mm / -35mm - Retail Price:
250 USD
HIGH Tech Springs
High Tech is made from a new material called "Vanadium" which is much lighter then other spring and increases flexibility. All spring are designed specifically to fit each car for maximum performance. About a 3 cm drop for a more attractive appearance.
Offers slighly stiffer springrate and a moderate lowering compared to the S.Tech. These are high quality springs!
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GD1 and GD3: Part number SKA04-G1B00 - Springrate Front/Rear: ~ 2.3k / ~ 3.4k - Lowering Front / Rear: -30mm / -15mm - Retail Price:
300 USD
Type Wagon Damper
Type WAGON is the coilover kit for recreational veicle and it provides comfort & fine driving stability even if you use upsizing wheels.Adopted single spring, it prevents a noise due to contact each spring wire. These coilovers are hight-adjustable, and include everything you need to get it up and running.
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GD1 and GD3: Part number
DSA04-U1AS2 - Springrate Front/Rear: ~ 4.0k / ~ 6.0k - Lowering Front / Rear: -50mm / -40mm - Retail Price:
800 USD
Type Super Wagon
This is the Type Wagon systems big brother. The quality has been raised to handle more beating from the streets or the tracks using harder and stronger alloys.
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GD1 and GD3: Part number
DSA04-91AS2 - Springrate Front/Rear: ~ 3.0k / ~ 6.5k - Lowering Front / Rear: -45mm / -35mm - Retail Price:
970 USD
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Spoon Sports
Spoon Sports is one of the world's leading Honda tuners and race teams. With direct support from Honda Japan, Spoon participates in endurance races all over the world. Spoon then passes this experience to Honda enthusiasts through its lineup of high quality performance parts.
Spoon Sports offer some of the best suspension systems there are today for the Honda Jazz - and for the serious tuner this is the definitive way to go!
SS: Fixed Dampeners & Progressive Springs
Offering a 4 to 5 CM drop in rideheight - this system is a killer for its price. This damper and spring combination offers a great upgrade to your suspension at a decent price.
GD1 and GD3: Part number
51600-GDA-000 (dampers) and 51400-GDA-001 (springs) - Springrate Front/Rear: ~4.4k / ~ 5.0k - Lowering Front / Rear: -50mm / -50mm - Retail Price:
550 USD (dampers) / 280 USD (springs)
SS: Complete Custom Coiloverkit (A K A The SHIT)
This is the bomb. There really isn't any other way of putting it. This system offers fully adjustable rideheight along with a wide viarity of springrates to go with the system. It also allows you to adjust the stiffness of the damper itself. The system is designed so that you may get the core coilover system, and swap out the springs depending on your use. A soft set for the street, and a hard set for the tracks. And it's easy!
Springrates go from 8k all the way up to 24k in 2k steps.
Coilover Partnumber: [b]51600-GD3-G20
Straight Springs Partnumbers:
8K: 51400-65-08K
10K: 51400-65-10K
12K: 51400-65-12K (.. and so on)
Swift Springs
Swift Lowering Springs: Progressive Springs. Comes with 3 years unlimited mileage warranty on the springs for defect or sagging if install by qualify technican.
GD1 and GD3: Part number
4H017 - Springrate Front/Rear: ~ 3k / ~ 5.6k - Lowering Front / Rear: -1.18" / -0.98" - Retail Price:
To be set
History of Swift Springs:
http://216.105.56.102/index.asp?PageAction=Custom&ID=91
The Spoon Sports Honda Fit that race in this country use the Swift Springs for their coil-overs and if it is good enough for Spoon Sports, certaintly it is good enough for the rest of us.
prices will be set at a later date. Available from ICBMotorSport.com
http://yhst-1408381693991.stores.yah...pfitgd3lo.html