Spring Rates
06-11-2008, 06:44 PM
#1
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Spring Rates
I am curious what you guys are using for spring rates on the track.... I am trying to keep a semi comfortable (not that important) daily driving but not sacrafice performance. I am looking for what you guys are running not what I could run. Thanks
06-11-2008, 07:24 PM
#2
for street tire (140+ treadwear) performance I'd recommend not exceeding 450 lb/in front and 250 - 275 lb/in rear
higher rates will run reasonably smooth on the street if the shock valving is not set very aggressive, but will overwhelm regular street tires when pushed hard
higher rates will run reasonably smooth on the street if the shock valving is not set very aggressive, but will overwhelm regular street tires when pushed hard
06-12-2008, 11:39 AM
#3
Row faster, I hear banjos
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In a later thread, AlexCisneros opened up his compilation to revisions/input from other members. Those revised spring rates are listed below:
Link to thread: https://www.rx8club.com/series-i-wheels-tires-brakes-suspension-55/spring-rates-33424/
I had posted these in another thread and thought it may be useful to everyone. In this manner I can edit when new information is made available and keep it up front.
All have been converted to lb/in.
Stock RX8 6spd
F 155.61 lb/in
R 112.86 lb/in
Stock RX8 Automatic
F 144.21 lb/in
R 101.46 lb/in
Mazdaspeed Spring
F 280 lb/in
R 190.4 lb/in
Tein high tech
F 184.8 lb/in
R 134.4 lb/in
Tein S Tech
F 207 lb/in
R 145 lb/in
RS*R
F 181.44 lb/in
R 122.08 lb/in
Tanabe Sustec NF210 (Normal Feel)
F 162.4 lb/in
R 112 lb/in
Tanabe Sustec GF210
F 179.2 lb/in
R 145.6 lb/in
Auto Exe
F 212.8 lb/in
R 145.6 lb/in
Espelir
F 212.8 lb/in
R 151.2 lb/in
Racing Beat
F 187 lb/in (calculated 20% Stiffer than Stock)
R 136 lb/in (calculated 20% Stiffer than Stock)
H&R
F 194~203 lb/in (calculated 25%~30% Stiffer than Stock)
R 141~146 lb/in (calculated 25%~30% Stiffer than Stock)
Eibach
F 180-187 lb/in (calculated progressive rate 15%~20% Stiffer than Stock)
R 130-136 lb/in (calculated progressive rate 15%~20% Stiffer than Stock)
--coilover--
Tein CS
F 280 lb/in
R 168 lb/in
Tein Flex
F 504 lb/in
R 392 lb/in
Tein Basic
F 448 lb/in
R 336 lb/in
HKS Hipermax II
F 448 lb/in
R 280 lb/in
JIC FLTA2S
F 448 lb/in
R 280 lb/in
JIC FLTA2H
F 560 lb/in
R 392 lb/in
Speedsource Grand Am Cup Cars changes from track to track but was
F 800 lb/in
R ??
at one point according to one of the drivers.
All have been converted to lb/in.
Stock RX8 6spd
F 155.61 lb/in
R 112.86 lb/in
Stock RX8 Automatic
F 144.21 lb/in
R 101.46 lb/in
Mazdaspeed Spring
F 280 lb/in
R 190.4 lb/in
Tein high tech
F 184.8 lb/in
R 134.4 lb/in
Tein S Tech
F 207 lb/in
R 145 lb/in
RS*R
F 181.44 lb/in
R 122.08 lb/in
Tanabe Sustec NF210 (Normal Feel)
F 162.4 lb/in
R 112 lb/in
Tanabe Sustec GF210
F 179.2 lb/in
R 145.6 lb/in
Auto Exe
F 212.8 lb/in
R 145.6 lb/in
Espelir
F 212.8 lb/in
R 151.2 lb/in
Racing Beat
F 187 lb/in (calculated 20% Stiffer than Stock)
R 136 lb/in (calculated 20% Stiffer than Stock)
H&R
F 194~203 lb/in (calculated 25%~30% Stiffer than Stock)
R 141~146 lb/in (calculated 25%~30% Stiffer than Stock)
Eibach
F 180-187 lb/in (calculated progressive rate 15%~20% Stiffer than Stock)
R 130-136 lb/in (calculated progressive rate 15%~20% Stiffer than Stock)
--coilover--
Tein CS
F 280 lb/in
R 168 lb/in
Tein Flex
F 504 lb/in
R 392 lb/in
Tein Basic
F 448 lb/in
R 336 lb/in
HKS Hipermax II
F 448 lb/in
R 280 lb/in
JIC FLTA2S
F 448 lb/in
R 280 lb/in
JIC FLTA2H
F 560 lb/in
R 392 lb/in
Speedsource Grand Am Cup Cars changes from track to track but was
F 800 lb/in
R ??
at one point according to one of the drivers.
Last edited by chiketkd; 06-12-2008 at 09:05 PM.
06-12-2008, 03:50 PM
#5
This post has lots of good info on Spring Rates (stock & aftermarket). Could be very useful when deciding what to purchase:
Link to thread: https://www.rx8club.com/series-i-wheels-tires-brakes-suspension-55/stock-spring-rates-32731/
Link to thread: https://www.rx8club.com/series-i-wheels-tires-brakes-suspension-55/stock-spring-rates-32731/
Some of those have since proven to not be valid, I don't think you have any direct experience on this topic so as always consider the source ...
06-12-2008, 05:12 PM
#6
Row faster, I hear banjos
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Wasn't claiming to be knowledgeable on this subject. Just trying to help the OP out when he goes shopping for springs/coilovers that match your recommendation. What rates are incorrect? Can you update/revise the list?
06-12-2008, 09:10 PM
#7
Row faster, I hear banjos
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I've updated post #3 with a later post with revised spring rates based on input provided by other RX8club members. I don't know the validity of these spring rates, but if any numbers are off, hopefully, the correct spring rates can be posted so that this info can be useful to others in the future.
06-13-2008, 02:56 AM
#8
the person that is doing really really well on track days. in tt and ta..
is running racing beat springs and sways.. might just be the front sway.. and bilstein shocks.. hd. a ride in that car is amazing.
the other two hpde 3/4 guys are running tein basics..
beers
is running racing beat springs and sways.. might just be the front sway.. and bilstein shocks.. hd. a ride in that car is amazing.
the other two hpde 3/4 guys are running tein basics..
beers
06-19-2008, 06:40 PM
#14
the only thing I would recommend other than a true motorsport coilover setup is the KW Variant3 coilover kit
455# front
280# rear
https://www.rx8club.com/group-buy-center-85/gb-kw-variant-3-coilover-suspension-110818/
IMO all that other stuff is a pig's ears blinged up to look like a neon purse
455# front
280# rear
https://www.rx8club.com/group-buy-center-85/gb-kw-variant-3-coilover-suspension-110818/
IMO all that other stuff is a pig's ears blinged up to look like a neon purse
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