K-Sport spring rates

G Rahn · 04-02-07, 11:04 AM

I am preparing to order a set of K-Sport coilovers and I am trying to determine what spring rate to specify. I read on the group buy page of 12/7 and 13/7 rates, but I have no idea what that relates to. Apparently, I can custom order any rate from K-Sport, and I want something that isn't going to bone-jarringly harsh. The Eibachs are stiff enough for my liking.
I am not going to be lowering the car radically if that is an issue. I like the drop I have with my Eibachs, which is about 1 1/4" as I recall.
So, how do spring rate numbers work? Is there a way to compare stock vs Eibach, for example?

Alperovich · 04-02-07, 11:50 AM

well, first of all, tahts gay that you can pick your own rates and when i ordered mine i was told it wasn't possible.

as for the spring rates thenselfs. ksports are 13/7, thats stiff. cared to ground control with a 4/3 or 6/3(4) something like that. if u want soft ride, i'd do around that, i think the eibach prokit are softer then that maybe 3/2ish.

i think in the original Ksport thread we had all of them listed. try reading up in that thread.

slartibartfast · 04-02-07, 12:00 PM

If I read the K-sport web site correctly, those are metric numbers. 13 would be rate in kg/mm; converting to American units yields 728 lb/in. Rather stiff unless the spring sits way inboard.

Conversion factor is 56, give or take a fraction. I don't know what 7 indicates...maybe wire thickness?

Blackend · 04-02-07, 12:06 PM

Ksport will recomend not changing the spring rate because the damper settings are valved to work with the preset spring rates and changing that may result in damper failure.

I have my dampers set to full soft and it is still WAY stiffer than the Koni/H&R set up I was on. If you're looking for adjustability, but you're not auto-x or tracking your car, I would say go with some GC threaded springs.

As a daily driver - Ksport is not the way to go.

lgnd4u2nv · 04-02-07, 12:53 PM

you say the eibachs are stiff enough for your liking.....and you dont plan on lowering you car more than it is......

so maybe im missing something. why do you want the Ksports?

they are only gonna make your ride stiffer and give you the ability to lower your car more

Alperovich · 04-02-07, 01:25 PM

Quote:

Originally Posted by slartibartfast

If I read the K-sport web site correctly, those are metric numbers. 13 would be rate in kg/mm; converting to American units yields 728 lb/in. Rather stiff unless the spring sits way inboard.

Conversion factor is 56, give or take a fraction. I don't know what 7 indicates...maybe wire thickness?

the 13 is the front spring rates, 7 is the rear.

Quote:

Originally Posted by lgnd4u2nv

you say the eibachs are stiff enough for your liking.....and you dont plan on lowering you car more than it is......

so maybe im missing something. why do you want the Ksports?

they are only gonna make your ride stiffer and give you the ability to lower your car more

i agree, koni's with eibach's is probably more of what he is looking for....

G Rahn · 04-02-07, 01:30 PM

Quote:

Originally Posted by lgnd4u2nv

you say the eibachs are stiff enough for your liking.....and you dont plan on lowering you car more than it is......

so maybe im missing something. why do you want the Ksports?

they are only gonna make your ride stiffer and give you the ability to lower your car more

I see the coilover system as being superior to what I have now- they are easy to adjust to the exact height I choose, and I like the individual adjustments so I can overcome the "driver sag" that is common with the separate coil and strut setup. I wouldn't mind some extra stiffness- just not to the degree Blackend and others have.
I understand your point on the potential for valve failure due to excessive spring travel, Blackend. I'm going to try to find a liveable compromise between shortened service life and kidney replacement surgery.

I'll dig through the spring rate threads and see if I can decipher it- from what I can gather, the lower the number, the softer the spring, correct? Perhaps a 10/7 would be a good choice here.

Alperovich · 04-02-07, 02:02 PM

yea softer spring rate the lower the number. I'd call up Ksport and find out whats the softest spring rates you can order.

Blackend · 04-02-07, 03:10 PM

I'm not sure Ksports are the right decision though. For what you'd spend on them to gain adjustability, you could save yourself several hundreds of dollars and buy a set of Ground Control springs. Very similar rates to the Eibach setup, but they're fully threaded sleeves so the height adjustment you want is there, but without the need for Ksport to match the valving on their dampers (read CUSTOM WORK $$$) to the spring rates you want.

Last time I checked, you can still get GC's for around $400 brand new and there are sets to be had used for around $200.

TheLegend5peed · 04-02-07, 04:09 PM

just use the ksports the way they are .... in my opinion its not harsh at all.

jkurl · 12-29-07, 10:10 PM

Quote:

Originally Posted by G Rahn

I see the coilover system as being superior to what I have now- they are easy to adjust to the exact height I choose, and I like the individual adjustments so I can overcome the "driver sag" that is common with the separate coil and strut setup. I wouldn't mind some extra stiffness- just not to the degree Blackend and others have.
I understand your point on the potential for valve failure due to excessive spring travel, Blackend. I'm going to try to find a liveable compromise between shortened service life and kidney replacement surgery.

I'll dig through the spring rate threads and see if I can decipher it- from what I can gather, the lower the number, the softer the spring, correct? Perhaps a 10/7 would be a good choice here.

G Rahn, did you ever sort this ksport spring rate question out? I'm itching for ksports but not lots of bouncing or rattling, the roads in los angeles are horrible. thanks

04-02-07, 11:04 AM	#1 (permalink)
G Rahn Call me Mister Join Date: Feb 2002 Location: Wherever it's nice Posts: 775 Car 1: 94 LS sedan iTrader: (5)	K-Sport spring rates I am preparing to order a set of K-Sport coilovers and I am trying to determine what spring rate to specify. I read on the group buy page of 12/7 and 13/7 rates, but I have no idea what that relates to. Apparently, I can custom order any rate from K-Sport, and I want something that isn't going to bone-jarringly harsh. The Eibachs are stiff enough for my liking. I am not going to be lowering the car radically if that is an issue. I like the drop I have with my Eibachs, which is about 1 1/4" as I recall. So, how do spring rate numbers work? Is there a way to compare stock vs Eibach, for example? __________________ ~ Guy

04-02-07, 12:00 PM	#3 (permalink)
slartibartfast Bitter Old Man Join Date: Oct 2005 Location: La Porte, Texas Posts: 687 Car 1: 1990 Legend LS sedan Car 2: 2002 Dakota SLT QC Car 3: 1998 Bandit 1200S iTrader: (0)	If I read the K-sport web site correctly, those are metric numbers. 13 would be rate in kg/mm; converting to American units yields 728 lb/in. Rather stiff unless the spring sits way inboard. Conversion factor is 56, give or take a fraction. I don't know what 7 indicates...maybe wire thickness? __________________ Bruce in Houston 2007 Mazda MX-5 Touring 2002 Dodge Dakota QC tow beast, stock! 1998 Suzuki Bandit 1200S w/ $tuff 1994 Nissan Sentra SE-R w/ $tuff converting to ITA 1990 Acura Legend LS sedan leaving the stable

04-02-07, 12:06 PM	#4 (permalink)
Blackend Blackend Motorsports Join Date: Apr 2004 Location: DFW Area Posts: 4,173 Car 1: Blackend Motorsports Car 2: 1995 LS Coupe iTrader: (23)	Ksport will recomend not changing the spring rate because the damper settings are valved to work with the preset spring rates and changing that may result in damper failure. I have my dampers set to full soft and it is still WAY stiffer than the Koni/H&R set up I was on. If you're looking for adjustability, but you're not auto-x or tracking your car, I would say go with some GC threaded springs. As a daily driver - Ksport is not the way to go. __________________ NALM NAZI We Brought Them We Broke Them We WILL Rebuild Them Better! G2 Legend Engine Dampers NOW IN STOCK! Click Here!

04-02-07, 12:53 PM	#5 (permalink)
lgnd4u2nv Registered User Join Date: Jun 2004 Location: Charlotte, NC Posts: 1,008 Car 1: 1991 Acura Legend iTrader: (2)	you say the eibachs are stiff enough for your liking.....and you dont plan on lowering you car more than it is...... so maybe im missing something. why do you want the Ksports? they are only gonna make your ride stiffer and give you the ability to lower your car more __________________ The Performance Handling Sedan Ksport Coilovers, MLS strut bar, Fut's rear tie bars, ADDCO rear sway bar MAY 10TH CHARLOTTE NC LEGEND MEET! CLICK HERE Winter NC meet picture and discussion thread!

04-02-07, 03:10 PM	#9 (permalink)
Blackend Blackend Motorsports Join Date: Apr 2004 Location: DFW Area Posts: 4,173 Car 1: Blackend Motorsports Car 2: 1995 LS Coupe iTrader: (23)	I'm not sure Ksports are the right decision though. For what you'd spend on them to gain adjustability, you could save yourself several hundreds of dollars and buy a set of Ground Control springs. Very similar rates to the Eibach setup, but they're fully threaded sleeves so the height adjustment you want is there, but without the need for Ksport to match the valving on their dampers (read CUSTOM WORK $$$) to the spring rates you want. Last time I checked, you can still get GC's for around $400 brand new and there are sets to be had used for around $200. __________________ NALM NAZI We Brought Them We Broke Them We WILL Rebuild Them Better! G2 Legend Engine Dampers NOW IN STOCK! Click Here!

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04-02-07, 04:09 PM	#10 (permalink)
TheLegend5peed Registered User Join Date: Mar 2005 Location: Arizona Posts: 163 Car 1: 1993 sedan iTrader: (5)	just use the ksports the way they are .... in my opinion its not harsh at all. __________________ 93 Sedan 5spd Type 2 Manifold Bayou Chip CL-S wheels 4300K HIDS Ksport Coilovers Alpine cda-9831

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