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Gsedan35 · 10-22-2004, 01:05 AM

Below is a much updated data base list for coilovers, I've added a number of new products, or products that I discovered specs for. I've done this to help myself out as I ponder what to get and to help the CVP35/V35/Z33 community out.

What it tells you,
1. How much stiffer then oem each products springs are in percentage, this way you can get the stiffness you want or see where to avoid too much stiffness.
2. Tracks how the cars handling might be effected by a transfer of roll stiffness (watch out for large transfers).
3. Tells you as much as possible, the design and features offered.
4. Gives you special notes concerning details you might want to include in any buying decision.

What to buy depends on what you want once the product is installed, as in comfort, sport, track, or race. How do you feel about brand name, the trust factor. What price point are you comfortable with. And should you pay extra for features you may want to have down the road in the future.

Oem springs
Front:314 Rear:342

Tein Flex (twin tube construction, adjustable dampners
Full-length adjustment and height adjustment for separate setting of the height and spring preload
672/672 F+114% R+98
Transfers +16% roll stiffness to front
Side Note: Extremely high spring rates mean even when the adjustable damping is set as low as possible, you may not find ride quality happiness, several reports of this setups harshness exist Yet a few owner comment’s of a “like stock ride quality” also exist. However given the fact that they use a spring stiffness that’s over 100% stiffer then oem, if ride quality is of concern, either hitch a ride in a car equipped with them or make a different choice. In addition, several review’s have been done by people actually having the original more softly sprung Tein Flex coilovers do not take their comments to mean the same as the one using the current product, the original product specs are listed below under Tein Flex JDM.

Tein Flex JDM specs (can be special ordered est 6-8 weeks delivery)
Full-length adjustment and height adjustment for separate setting of the height and spring preload
560/560 F+78% R+64%
Transfers 14% roll stiffness to front
Side Note: This is the original specs first offered in the U.S. with the Flex, shortly after it’s introduction the specs changed to those listed further above (672/672)

Tein Basic (twin tube construction, non adjustable dampners )
504/504 F+61% R+43%
Transfers +18% roll stiffness to front
Side Note: Excellent value at it’s price point, some very good reviews have been done by users of this coilover system.

Tein SS (twin tube construction, adjustable dampners )
(JDM only at this time. 6-8 weeks delivery, come via ship)
392/314-392 (rear’s are progressive)
F+25% R+15% at peak

Tein CS (Monotube constructionad, adjustable dampners )
Side Note: A comfort ride system compare to HKS LS
392/392 F+25% R15%
Transfers +10% roll stiffness to front
Special Note: I had a conversation with Tein about this coilover. I called because I had a hunch that the comfort tuning designed into the system would prevent me from getting the dampning stiffness I wanted. When I told him I wanted a system that would be valved stiffer then oem 350Z shocks, he did not believe they were setup to do that. Revalving them would be $300 or so PER! dampner.

Buddy Club Racing Spec coilovers (Monotube construction, adjustable dampning)
Full-length adjustment and height adjustment for separate setting of the height and spring preload
748/280*
(very likely run's rear springs on the dampner body and not at the oem rear spring location)

Jic Flta-2 350Z fitment (Monotube construction, adjustable dampning)
Full-length adjustment and height adjustment for separate setting of the height and spring preload
Special Note: This setup is known for it’s street ride harshness, but also for track performance
560/672 F+78% R+98%
Transfers +20% roll stiffness to rear

Jic Flta-2 G35 coupe (Monotube, adjustable dampning)
Full-length adjustment and height adjustment for separate setting of the height and spring preload
560/560 F+78% R+64% $1750
Transfers 14% roll stiffness to front

Jic Flta-2 G35 sedan (Monotube, adjustable dampning)
Full-length adjustment and height adjustment for separate setting of the height and spring preload
504/392 F+61% R+15%
Transfers +46% roll stiffness to front

Cusco Zero 1&2 (Monotube?, 1=non adjustable dampner, 2=adjustable dampner)
Full-length adjustment and height adjustment for separate setting of the height and spring preload
560/392 F+78% R+15%
Transfers +63% roll stiffness to front (no they do not run their rear springs on the dampner body, oem location, seen them on the car with my own eyes.)
Side Note: Thats a awful lot of spring stiffness to move to the front

Bilstein PSS coil over (Monotube construction, non adjustable dampners)
Special Note: Mild spring rates, but Bilstein says the dampners are performance valved
370/240-420 (rear progressive) F +18% R +23% (at peak rear spring rate)
Transfers +5% roll stiffness to rear
Special Note: Very easy to ditch the rear progressive springs that come with the Bilsteins (I would) Eibach sell's linear 5" O.D. springs that you can swap in, $100 for the pair.

Bilstein PSS9 coilover (Monotube construction, adjustable dampners)
Special Note: Mild spring rates, but Bilstein says the dampners are performance valved
370/240-420 (rear progressive) F +18% R +23% (at peak rear spring rate)
Transfers +5% roll stiffness to rear
Special Note: Very easy to ditch the rear progressive springs that come with the Bilsteins (I would) Eibach sell's linear 5" O.D. springs that you can swap in, $100 for the pair.

ATTENTION! HKS will be opening a U.S. service center very shortly, allowing for service and repair on their coilovers here, without sending them to Japan.

HKS LS+ G35 Coupe (Monotube construction, adjustable dampners)
504/448 +58%front +29% (rear springs are progressive)
transfers 29% roll stiffness to the front
Side Note: Tuned more aggressively then the LS.
Special Note: This G35 coupe version, while transfering roll stiffness to the front vs the same 350Z version, does actually use stiffer valving in it's dampners then the Z version.

HKS LS+ 350Z (Monotube construction, adjustable dampners)
448/448 43%front +31%
transfers 12% roll stiffness to the front
Side Note: Tuned more aggressively then the LS, but not to the RS level, in spite of the RS actually using softer spring rates. Special Note: This 350Z version does not transfer as much roll stiffness to the front as the G35 version, but does use softer valving specs in it's dampners.

HKS LS G35 (Monotube construction, non adjustable dampners)
448/336 F +43% R -1%
transfers 44% roll stiffness to the front
Special Note: A comfort ride system, compare to Tein CS coilover

HKS LS 350z (Monotube construction, non adjustable dampners)
448/448 F43% R+31%
transfers 12% roll stiffness to the front
Special Note: A comfort ride system, spring rates make better sense then same G35 application, compare to Tein CS

HKS II (Monotube construction, adjustable dampners)
504/504 F+61% R+47%
transfers 14% roll stiffness to the front
Special Note: sprung and valved to be HKS’s most aggressive product, it is a notch above the RS coil over on the track, compare to Tein Flex and Jic coilovers

HKS RS (Monotube construction, adjustable dampning)
448/448 F+43% R+31%
Transfers 12% roll stiffness to the front
Special Note: “Marketed” as HKS’s track coil over with a good street ride, it is more aggressive then the HKS LS+ and does not transfer as much spring stiffness to the front.

Zeal function V6 coilover (Monotube construction, adjustable dampner) $2855
Full-length adjustment and height adjustment for separate setting of the height and spring preload
560/448 F+78% R+31%
Transfers +47% roll stiffness to front

KW coilovers Variant's 1,2&3
Monotube construction, V1=non adjustable dampning, V2=adjustable damping, V3=separate adjustability for compression damping AND rebound damping and is the only product of it’s kind at this time.
Front: 485lbs to 525Lbs Rear: 240Lbs to 548Lbs (progressive springs)

D2 Racing Coilovers (Monotube)
840/728 F+168% R+113% (wee bit stiff eh, the recommended rate to)
Transfers 55% roll stiffness to front
Side Note: Only known application of this coilover was by a vendor wishing to sell it, upon installation it was determined that the ride quality was so poor that they were pulled from the car and any idea of carrying the product was shelved.

Kg/mm DNA coilovers (Monotube construction, adjustable dampners)
840/280*+
JDM only at this time, $2700+
These look like they are made by buddy club.
*They use rear springs on the rear coil over bodies AND a progressive spring in the oem location. The best I can get translating is that the progressive spring add’s 200lbs to the rear rate.

10-22-2004, 01:05 AM	#10 (permalink)
Gsedan35 Over 100 Posts Join Date: Jun 2004 Posts: 178	Below is a much updated data base list for coilovers, I've added a number of new products, or products that I discovered specs for. I've done this to help myself out as I ponder what to get and to help the CVP35/V35/Z33 community out. What it tells you, 1. How much stiffer then oem each products springs are in percentage, this way you can get the stiffness you want or see where to avoid too much stiffness. 2. Tracks how the cars handling might be effected by a transfer of roll stiffness (watch out for large transfers). 3. Tells you as much as possible, the design and features offered. 4. Gives you special notes concerning details you might want to include in any buying decision. What to buy depends on what you want once the product is installed, as in comfort, sport, track, or race. How do you feel about brand name, the trust factor. What price point are you comfortable with. And should you pay extra for features you may want to have down the road in the future. Oem springs Front:314 Rear:342 Tein Flex (twin tube construction, adjustable dampners Full-length adjustment and height adjustment for separate setting of the height and spring preload 672/672 F+114% R+98 Transfers +16% roll stiffness to front Side Note: Extremely high spring rates mean even when the adjustable damping is set as low as possible, you may not find ride quality happiness, several reports of this setups harshness exist Yet a few owner comment’s of a “like stock ride quality” also exist. However given the fact that they use a spring stiffness that’s over 100% stiffer then oem, if ride quality is of concern, either hitch a ride in a car equipped with them or make a different choice. In addition, several review’s have been done by people actually having the original more softly sprung Tein Flex coilovers do not take their comments to mean the same as the one using the current product, the original product specs are listed below under Tein Flex JDM. Tein Flex JDM specs (can be special ordered est 6-8 weeks delivery) Full-length adjustment and height adjustment for separate setting of the height and spring preload 560/560 F+78% R+64% Transfers 14% roll stiffness to front Side Note: This is the original specs first offered in the U.S. with the Flex, shortly after it’s introduction the specs changed to those listed further above (672/672) Tein Basic (twin tube construction, non adjustable dampners ) 504/504 F+61% R+43% Transfers +18% roll stiffness to front Side Note: Excellent value at it’s price point, some very good reviews have been done by users of this coilover system. Tein SS (twin tube construction, adjustable dampners ) (JDM only at this time. 6-8 weeks delivery, come via ship) 392/314-392 (rear’s are progressive) F+25% R+15% at peak Tein CS (Monotube constructionad, adjustable dampners ) Side Note: A comfort ride system compare to HKS LS 392/392 F+25% R15% Transfers +10% roll stiffness to front Special Note: I had a conversation with Tein about this coilover. I called because I had a hunch that the comfort tuning designed into the system would prevent me from getting the dampning stiffness I wanted. When I told him I wanted a system that would be valved stiffer then oem 350Z shocks, he did not believe they were setup to do that. Revalving them would be $300 or so PER! dampner. Buddy Club Racing Spec coilovers (Monotube construction, adjustable dampning) Full-length adjustment and height adjustment for separate setting of the height and spring preload 748/280* (very likely run's rear springs on the dampner body and not at the oem rear spring location) Jic Flta-2 350Z fitment (Monotube construction, adjustable dampning) Full-length adjustment and height adjustment for separate setting of the height and spring preload Special Note: This setup is known for it’s street ride harshness, but also for track performance 560/672 F+78% R+98% Transfers +20% roll stiffness to rear Jic Flta-2 G35 coupe (Monotube, adjustable dampning) Full-length adjustment and height adjustment for separate setting of the height and spring preload 560/560 F+78% R+64% $1750 Transfers 14% roll stiffness to front Jic Flta-2 G35 sedan (Monotube, adjustable dampning) Full-length adjustment and height adjustment for separate setting of the height and spring preload 504/392 F+61% R+15% Transfers +46% roll stiffness to front Cusco Zero 1&2 (Monotube?, 1=non adjustable dampner, 2=adjustable dampner) Full-length adjustment and height adjustment for separate setting of the height and spring preload 560/392 F+78% R+15% Transfers +63% roll stiffness to front (no they do not run their rear springs on the dampner body, oem location, seen them on the car with my own eyes.) Side Note: Thats a awful lot of spring stiffness to move to the front Bilstein PSS coil over (Monotube construction, non adjustable dampners) Special Note: Mild spring rates, but Bilstein says the dampners are performance valved 370/240-420 (rear progressive) F +18% R +23% (at peak rear spring rate) Transfers +5% roll stiffness to rear Special Note: Very easy to ditch the rear progressive springs that come with the Bilsteins (I would) Eibach sell's linear 5" O.D. springs that you can swap in, $100 for the pair. Bilstein PSS9 coilover (Monotube construction, adjustable dampners) Special Note: Mild spring rates, but Bilstein says the dampners are performance valved 370/240-420 (rear progressive) F +18% R +23% (at peak rear spring rate) Transfers +5% roll stiffness to rear Special Note: Very easy to ditch the rear progressive springs that come with the Bilsteins (I would) Eibach sell's linear 5" O.D. springs that you can swap in, $100 for the pair. ATTENTION! HKS will be opening a U.S. service center very shortly, allowing for service and repair on their coilovers here, without sending them to Japan. HKS LS+ G35 Coupe (Monotube construction, adjustable dampners) 504/448 +58%front +29% (rear springs are progressive) transfers 29% roll stiffness to the front Side Note: Tuned more aggressively then the LS. Special Note: This G35 coupe version, while transfering roll stiffness to the front vs the same 350Z version, does actually use stiffer valving in it's dampners then the Z version. HKS LS+ 350Z (Monotube construction, adjustable dampners) 448/448 43%front +31% transfers 12% roll stiffness to the front Side Note: Tuned more aggressively then the LS, but not to the RS level, in spite of the RS actually using softer spring rates. Special Note: This 350Z version does not transfer as much roll stiffness to the front as the G35 version, but does use softer valving specs in it's dampners. HKS LS G35 (Monotube construction, non adjustable dampners) 448/336 F +43% R -1% transfers 44% roll stiffness to the front Special Note: A comfort ride system, compare to Tein CS coilover HKS LS 350z (Monotube construction, non adjustable dampners) 448/448 F43% R+31% transfers 12% roll stiffness to the front Special Note: A comfort ride system, spring rates make better sense then same G35 application, compare to Tein CS HKS II (Monotube construction, adjustable dampners) 504/504 F+61% R+47% transfers 14% roll stiffness to the front Special Note: sprung and valved to be HKS’s most aggressive product, it is a notch above the RS coil over on the track, compare to Tein Flex and Jic coilovers HKS RS (Monotube construction, adjustable dampning) 448/448 F+43% R+31% Transfers 12% roll stiffness to the front Special Note: “Marketed” as HKS’s track coil over with a good street ride, it is more aggressive then the HKS LS+ and does not transfer as much spring stiffness to the front. Zeal function V6 coilover (Monotube construction, adjustable dampner) $2855 Full-length adjustment and height adjustment for separate setting of the height and spring preload 560/448 F+78% R+31% Transfers +47% roll stiffness to front KW coilovers Variant's 1,2&3 Monotube construction, V1=non adjustable dampning, V2=adjustable damping, V3=separate adjustability for compression damping AND rebound damping and is the only product of it’s kind at this time. Front: 485lbs to 525Lbs Rear: 240Lbs to 548Lbs (progressive springs) D2 Racing Coilovers (Monotube) 840/728 F+168% R+113% (wee bit stiff eh, the recommended rate to) Transfers 55% roll stiffness to front Side Note: Only known application of this coilover was by a vendor wishing to sell it, upon installation it was determined that the ride quality was so poor that they were pulled from the car and any idea of carrying the product was shelved. Kg/mm DNA coilovers (Monotube construction, adjustable dampners) 840/280+ JDM only at this time, $2700+ These look like they are made by buddy club. They use rear springs on the rear coil over bodies AND a progressive spring in the oem location. The best I can get translating is that the progressive spring add’s 200lbs to the rear rate.