| jruben4 | 01-15-2007 01:27 PM |
Poll: STI owners, what is your spring rate?
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Just wondering what everyone is using for spring rates on their STIs. Please let me know:
a) front/rear spring rate
b) application (track, auto-x, etc).
a) front/rear spring rate
b) application (track, auto-x, etc).
| deebee8 | 01-15-2007 09:29 PM |
I know im pretty much being useless to this thread, but i have a WRX with 900 lb fronts and 1100 lb rears. hope this helps!!
Oh yeah, the car is being prepped for NASA TTU
Oh yeah, the car is being prepped for NASA TTU
| Mykl | 01-15-2007 09:30 PM |
450 lb/in (~8k) front, 400 lb/in (~7k) rear
Cobb swaybars, rear set to full stiff
245/45-17 Falken Azenis RT615's
I need to stiffen my car up just a little. Gonna start with swaybars.
Applications... street, track, autocross.
Cobb swaybars, rear set to full stiff
245/45-17 Falken Azenis RT615's
I need to stiffen my car up just a little. Gonna start with swaybars.
Applications... street, track, autocross.
| dowroa | 01-15-2007 09:31 PM |
2005 STi
a) 10k/8K -- Tein Flex, Strano 32mm FSB, 235/40/17
b) autoX/track
- dow
a) 10k/8K -- Tein Flex, Strano 32mm FSB, 235/40/17
b) autoX/track
- dow
| import111 | 01-15-2007 09:35 PM |
2005 STi
a)10k/8k F/R with Tien Flex coilovers, Cobb 25mm swaybars F/R (rear set to middle)
b)street/track
a)10k/8k F/R with Tien Flex coilovers, Cobb 25mm swaybars F/R (rear set to middle)
b)street/track
| jmott | 01-15-2007 09:45 PM |
tire specs would be extremely important to go with this data.
the ideal spring rate is going to completely change with a taller tire, wider tire, or different brand of tire...
the ideal spring rate is going to completely change with a taller tire, wider tire, or different brand of tire...
| waktasz | 01-15-2007 09:47 PM |
[QUOTE=deebee8;16677214]I know im pretty much being useless to this thread, but i have a WRX with 900 lb fronts and 1100 lb rears. hope this helps!!
Oh yeah, the car is being prepped for NASA TTU[/QUOTE]
WHA?T!?!
Do you mean 9k/11k?
Those are CRAZY stiff...I didn't even know stuff like that existed?!
/amazed
Oh yeah, the car is being prepped for NASA TTU[/QUOTE]
WHA?T!?!
Do you mean 9k/11k?
Those are CRAZY stiff...I didn't even know stuff like that existed?!
/amazed
| spazegun2213 | 01-15-2007 09:51 PM |
[QUOTE=deebee8;16677214]I know im pretty much being useless to this thread, but i have a WRX with 900 lb fronts and 1100 lb rears. hope this helps!!
Oh yeah, the car is being prepped for NASA TTU[/QUOTE]
i sure hope its going to be super light ;)
is there anywhere where you detail the build? I'd love to see pictures and get updates.
Oh yeah, the car is being prepped for NASA TTU[/QUOTE]
i sure hope its going to be super light ;)
is there anywhere where you detail the build? I'd love to see pictures and get updates.
| deebee8 | 01-15-2007 11:46 PM |
unfortunatly im kinda keeping it under wraps, im not anywhere near finished, and funds are VERY limited right now, it is however a grassroots style car.
Everything installed, fabricated, repaired by me.
And yes the car is extremely light,
FULLY Gutted, 1 seat, no ac, no radio, no power steering, no front subframe. No front grill!! No Horns, Sparco Wheel!
EVERYTHING IS GUTTED.
When i respray her ill take some pics, right now im kinda of bored and pissed at her for not running the way i want her to. Time will tell, i promise pics.
Everything installed, fabricated, repaired by me.
And yes the car is extremely light,
FULLY Gutted, 1 seat, no ac, no radio, no power steering, no front subframe. No front grill!! No Horns, Sparco Wheel!
EVERYTHING IS GUTTED.
When i respray her ill take some pics, right now im kinda of bored and pissed at her for not running the way i want her to. Time will tell, i promise pics.
| Penguinking | 01-16-2007 01:14 AM |
[QUOTE=waktasz;16677449]WHA?T!?!
Do you mean 9k/11k?
Those are CRAZY stiff...I didn't even know stuff like that existed?!
/amazed[/QUOTE]
porsche cup cars run 1900/2200 lb springs regularly. 900 lb springs are nothing
Do you mean 9k/11k?
Those are CRAZY stiff...I didn't even know stuff like that existed?!
/amazed[/QUOTE]
porsche cup cars run 1900/2200 lb springs regularly. 900 lb springs are nothing
| deebee8 | 01-16-2007 01:52 AM |
hes got a great point, actually,
I do believe that TeamSMR or GOTO Racing, were running between 1100 and 1300 spring rates.
Correct me if im wrong, i definatly dont want to be giving out bad information here, that is just what i seem to recall. Feel free to Chime in!!
I do believe that TeamSMR or GOTO Racing, were running between 1100 and 1300 spring rates.
Correct me if im wrong, i definatly dont want to be giving out bad information here, that is just what i seem to recall. Feel free to Chime in!!
| Penguinking | 01-16-2007 02:11 AM |
i'm not exactly sure on the numbers, but SRF's and other ground effects / formula type cars run spring rates unimaginable to someone only familiar with streetcars/sedans. try thinking 10,000lb rates.
| ToddStratton | 01-16-2007 02:59 PM |
04 STi
255/40 17 RA-1
100 N-mm (571 lb/in, 10.2 kg/mm) front
90 N-mm (514 lb/in, 9.2 kg/mm) rear
Whiteline sways - 26mm (f) 24mm (r)
track
(Not a daily driver--I'm only 5 miles from work...and have a beater to sling around in. But, it is very comfortable for the specs and I drive it 200 miles round trip to every track day...and once or twice a week for the heck of it)
Todd
255/40 17 RA-1
100 N-mm (571 lb/in, 10.2 kg/mm) front
90 N-mm (514 lb/in, 9.2 kg/mm) rear
Whiteline sways - 26mm (f) 24mm (r)
track
(Not a daily driver--I'm only 5 miles from work...and have a beater to sling around in. But, it is very comfortable for the specs and I drive it 200 miles round trip to every track day...and once or twice a week for the heck of it)
Todd
| kfoote | 01-16-2007 03:17 PM |
04 STi
Primarily street driven
Bilstein PSS9's with 450 lb/in F and 360 lb/in R
Stock sway bars
Formula and downforce cars generally run in the 2000-3500 lb/in range depending on application. THe stiffest spring H&R currently offers in the US is 100mm free length and 700 N/mm....just under 4000 lbs/in. If you want to cure your understeer problems, just put those on the back. :D
Primarily street driven
Bilstein PSS9's with 450 lb/in F and 360 lb/in R
Stock sway bars
Formula and downforce cars generally run in the 2000-3500 lb/in range depending on application. THe stiffest spring H&R currently offers in the US is 100mm free length and 700 N/mm....just under 4000 lbs/in. If you want to cure your understeer problems, just put those on the back. :D
| JoBoo | 01-16-2007 03:24 PM |
spring rates ( and for that matter damper rates) are highly geometry (static and dynamic) dependent variables, among other things.
| Scooby South | 01-16-2007 03:59 PM |
[QUOTE=ToddStratton;16686901]04 STi
255/40 17 RA-1
100 N-mm (571 lb/in, 10.2 kg/mm) front
90 N-mm (514 lb/in, 9.2 kg/mm) rear
[B]Whiteline sways - 26mm (f) 24mm (r)[/B]
track
Todd[/QUOTE]
^^^^[B]Whiteline sways - 26mm (f) 24mm (r)[/B] which makes a HUGE difference in overall spring rate...
thats something that alot of people overlook when calculating Spring Rate is the diameter of the Sway bar....Bigger the bar....the more spring rate you have...I am sure theres a equation that will help someone figure it out.....I know its in my "Handling Reference book"...somewhere...
so to say what spring rate you really have would depend on what sway bars your using..
Bill
255/40 17 RA-1
100 N-mm (571 lb/in, 10.2 kg/mm) front
90 N-mm (514 lb/in, 9.2 kg/mm) rear
[B]Whiteline sways - 26mm (f) 24mm (r)[/B]
track
Todd[/QUOTE]
^^^^[B]Whiteline sways - 26mm (f) 24mm (r)[/B] which makes a HUGE difference in overall spring rate...
thats something that alot of people overlook when calculating Spring Rate is the diameter of the Sway bar....Bigger the bar....the more spring rate you have...I am sure theres a equation that will help someone figure it out.....I know its in my "Handling Reference book"...somewhere...
so to say what spring rate you really have would depend on what sway bars your using..
Bill
| crystalhelix | 01-16-2007 04:35 PM |
I have a stock suspension right now, rates TBD for this coming year depending on a lot
In the past
Stock
Stock struts w/koni's and pinks
JIC FLTA-2 with 7k/5k
same with 600/500
Tein Flex 10/8
Tein Flex 12/10
and now I am moving to the zzyzx and I have no idea.
not a daily driver
but this statement is very accurate, you don't want to just copy someone's spring rates without having a setup that would require those rates, you will over "spring" the tire or damping, or bars, etc...there are too many variables.
[QUOTE=jmott;16677433]tire specs would be extremely important to go with this data.
the ideal spring rate is going to completely change with a taller tire, wider tire, or different brand of tire...[/QUOTE]
In the past
Stock
Stock struts w/koni's and pinks
JIC FLTA-2 with 7k/5k
same with 600/500
Tein Flex 10/8
Tein Flex 12/10
and now I am moving to the zzyzx and I have no idea.
not a daily driver
but this statement is very accurate, you don't want to just copy someone's spring rates without having a setup that would require those rates, you will over "spring" the tire or damping, or bars, etc...there are too many variables.
[QUOTE=jmott;16677433]tire specs would be extremely important to go with this data.
the ideal spring rate is going to completely change with a taller tire, wider tire, or different brand of tire...[/QUOTE]
| Scooby South | 01-16-2007 04:54 PM |
[QUOTE=crystalhelix;16688529]I have a stock suspension right now, rates TBD for this coming year depending on a lot
In the past
Stock
Stock struts w/koni's and pinks
JIC FLTA-2 with 7k/5k
same with 600/500
Tein Flex 10/8
Tein Flex 12/10
and now I am moving to the zzyzx and I have no idea.
but this statement is very accurate, you don't want to just copy someone's spring rates without having a setup that would require those rates, you will over "spring" the tire or damping, or bars, etc...there are too many variables.[/QUOTE]
^^^^ Agreed ...along with Tire pressure also...
Bill
In the past
Stock
Stock struts w/koni's and pinks
JIC FLTA-2 with 7k/5k
same with 600/500
Tein Flex 10/8
Tein Flex 12/10
and now I am moving to the zzyzx and I have no idea.
but this statement is very accurate, you don't want to just copy someone's spring rates without having a setup that would require those rates, you will over "spring" the tire or damping, or bars, etc...there are too many variables.[/QUOTE]
^^^^ Agreed ...along with Tire pressure also...
Bill
| WJM | 01-16-2007 05:18 PM |
A:
Front rate: 750 US lb/in
Rear rate: 700 US lb/in w/2 inch 250 US lb/in helpers
Dampers: D2 Racing 'with appropriate valving per spring rating'
Tires: 225/45/17 RE070 @45 PSI front and rear
Anti-Sway bars: 25MM front, 20MM rear
B:
Street/Auto-x/non-competition road course lapping.
Front rate: 750 US lb/in
Rear rate: 700 US lb/in w/2 inch 250 US lb/in helpers
Dampers: D2 Racing 'with appropriate valving per spring rating'
Tires: 225/45/17 RE070 @45 PSI front and rear
Anti-Sway bars: 25MM front, 20MM rear
B:
Street/Auto-x/non-competition road course lapping.
| Penguinking | 01-16-2007 05:19 PM |
[QUOTE=Scooby South;16687850]^^^^[B]Whiteline sways - 26mm (f) 24mm (r)[/B] which makes a HUGE difference in overall spring rate...
thats something that alot of people overlook when calculating Spring Rate is the diameter of the Sway bar....Bigger the bar....the more spring rate you have...I am sure theres a equation that will help someone figure it out.....I know its in my "Handling Reference book"...somewhere...
so to say what spring rate you really have would depend on what sway bars your using..
Bill[/QUOTE]
sorta like running with torsion bars in place of springs... but not really. but kinda?
thats something that alot of people overlook when calculating Spring Rate is the diameter of the Sway bar....Bigger the bar....the more spring rate you have...I am sure theres a equation that will help someone figure it out.....I know its in my "Handling Reference book"...somewhere...
so to say what spring rate you really have would depend on what sway bars your using..
Bill[/QUOTE]
sorta like running with torsion bars in place of springs... but not really. but kinda?
| Scooby South | 01-16-2007 05:37 PM |
[QUOTE=Penguinking;16689259]sorta like running with torsion bars in place of springs... but not really. but kinda?[/QUOTE]
Exactly....:)
Exactly....:)
| BoozeRS05 | 01-16-2007 10:45 PM |
What are the standard spring rates with a JDM STi V7 Suspension?
| deebee8 | 01-16-2007 11:20 PM |
[QUOTE] What are the standard spring rates with a JDM STi V7 Suspension?[/QUOTE]
Correct me if im wrong but i believe they are in the 260 range.....
im probably wrong, but i think i remember my old v8's being in that range
Correct me if im wrong but i believe they are in the 260 range.....
im probably wrong, but i think i remember my old v8's being in that range
| Butt Dyno | 01-17-2007 12:14 AM |
I think my Ver7 Type RA setup was 217/192 or something close.
The only OEM Subaru springs I know that are 250+ are the pink springs (maybe 252-217? and then the various Tarmac springs (inc. the Arai springs?)
The only OEM Subaru springs I know that are 250+ are the pink springs (maybe 252-217? and then the various Tarmac springs (inc. the Arai springs?)
| silver arrow | 01-17-2007 12:17 PM |
I was told when I bought my Flex's they were 12k/10k. They feel like 12k/10k, because my kidneys hurt everytime I drive the car. :lol: I will have to take a look and see if I can get a part number on the springs. Have 32mm FSB, stock rear.
Autocross, works well and I have found that small adjustments make quite a bit of difference in handling, but not ride. Probably because highspeed is set at factory. Will change to difference coilovers next year or get these rebuilt and revalved.
Autocross, works well and I have found that small adjustments make quite a bit of difference in handling, but not ride. Probably because highspeed is set at factory. Will change to difference coilovers next year or get these rebuilt and revalved.
| jruben4 | 01-17-2007 12:21 PM |
According to tein's website, ([URL="http://www.tein.com/flexdamp.html"]http://www.tein.com/flexdamp.html[/URL]) the flex's for the 05 STi are 9k/6k.
| crystalhelix | 01-17-2007 12:25 PM |
05 STi new version flex with o-ring gasket thingy on rear top hats are 10/8
it's stamped on teh springs. the chart at quick glance doens't specify the STi 05+, I think it's on another page...the 05+ STi is a different coil over than the ones for teh regular wrx..
edit - see what your talkin about.
if they changed to 9/6 I would understand 10/8 is a little sore for daily driving. But I think the 10/8 would be better for racing.
it's stamped on teh springs. the chart at quick glance doens't specify the STi 05+, I think it's on another page...the 05+ STi is a different coil over than the ones for teh regular wrx..
edit - see what your talkin about.
if they changed to 9/6 I would understand 10/8 is a little sore for daily driving. But I think the 10/8 would be better for racing.
| jruben4 | 01-17-2007 12:27 PM |
You may be right; but the chart on Tein's site does specify 9/6k for the "WRX STI 2005 Year Model (Rim P.C.D.=114.3)"
[QUOTE=crystalhelix;16699364]05 STi new version flex with o-ring gasket thingy on rear top hats are 10/8
it's stamped on teh springs. the chart at quick glance doens't specify the STi 05+, I think it's on another page...the 05+ STi is a different coil over than the ones for teh regular wrx..
edit - see what your talkin about.
if they changed to 9/6 I would understand 10/8 is a little sore for daily driving. But I think the 10/8 would be better for racing.[/QUOTE]
[QUOTE=crystalhelix;16699364]05 STi new version flex with o-ring gasket thingy on rear top hats are 10/8
it's stamped on teh springs. the chart at quick glance doens't specify the STi 05+, I think it's on another page...the 05+ STi is a different coil over than the ones for teh regular wrx..
edit - see what your talkin about.
if they changed to 9/6 I would understand 10/8 is a little sore for daily driving. But I think the 10/8 would be better for racing.[/QUOTE]
| silver arrow | 01-17-2007 12:32 PM |
The problem with all of this is we mostly going off of feel. I can make my car feel neutral and have good balance, but don't really know if I am getting maximum corner speeds with my setup. I will be logging tire temps this year and I have found the happy medium for tire pressure and feel that I want for the size tire I'm running now. I would kill to get my hands on a datalogger, several sets of different shock/spring combos and several different ST tires to play with. Haven't seen to many people in STU able or willing to put all that time and money into it and if they did they certainly wouldn't just tell everyone. Maybe next year I will be able to afford a data logger and will at least be able to maximize what I have, but I think I can get close with just good tire temps and notes.
| silver arrow | 01-17-2007 12:33 PM |
[QUOTE=jruben4;16699390]You may be right; but the chart on Tein's site does specify 9/6k for the "WRX STI 2005 Year Model (Rim P.C.D.=114.3)"[/QUOTE]
Tein is notorious for misinformation in the product line, I will check my springs when I rotate the tires this week and post #'s.
Tein is notorious for misinformation in the product line, I will check my springs when I rotate the tires this week and post #'s.
| jruben4 | 01-17-2007 12:34 PM |
I'd like to get the traqmate so you can analyize each turn entry/exit speeds individually. And then throw it in my buddies STi too to get some comparisons turn-by-turn. The only issue is I'm not sure I'm consistent enough that the only difference each lap would be my suspension settings. (Plus traffic, etc all changes the cornering speeds)...
[QUOTE=silver arrow;16699462]The problem with all of this is we mostly going off of feel. I can make my car feel neutral and have good balance, but don't really know if I am getting maximum corner speeds with my setup. I will be logging tire temps this year and I have found the happy medium for tire pressure and feel that I want for the size tire I'm running now. I would kill to get my hands on a datalogger, several sets of different shock/spring combos and several different ST tires to play with. Haven't seen to many people in STU able or willing to put all that time and money into it and if they did they certainly wouldn't just tell everyone. Maybe next year I will be able to afford a data logger and will at least be able to maximize what I have, but I think I can get close with just good tire temps and notes.[/QUOTE]
[QUOTE=silver arrow;16699462]The problem with all of this is we mostly going off of feel. I can make my car feel neutral and have good balance, but don't really know if I am getting maximum corner speeds with my setup. I will be logging tire temps this year and I have found the happy medium for tire pressure and feel that I want for the size tire I'm running now. I would kill to get my hands on a datalogger, several sets of different shock/spring combos and several different ST tires to play with. Haven't seen to many people in STU able or willing to put all that time and money into it and if they did they certainly wouldn't just tell everyone. Maybe next year I will be able to afford a data logger and will at least be able to maximize what I have, but I think I can get close with just good tire temps and notes.[/QUOTE]
| rbahr | 01-17-2007 01:00 PM |
550 front, 450 rear, Ohlins shocks, 26/27 mm front whiteline bar, adjustable rear cusco bar, lots of pillow ball/group N bits...
The car is still on the road but is not my only car. Mostly track events... NVH is just something I live with...
Ray
The car is still on the road but is not my only car. Mostly track events... NVH is just something I live with...
Ray
| silver arrow | 01-17-2007 07:15 PM |
[QUOTE=jruben4;16699520]I'd like to get the traqmate so you can analyize each turn entry/exit speeds individually. And then throw it in my buddies STi too to get some comparisons turn-by-turn. The only issue is I'm not sure I'm consistent enough that the only difference each lap would be my suspension settings. (Plus traffic, etc all changes the cornering speeds)...[/QUOTE]
That's what make things like the traction circle that plots peak forces in all directions comes in handy in will allow you to graphically look at the data and see trends
That's what make things like the traction circle that plots peak forces in all directions comes in handy in will allow you to graphically look at the data and see trends
| waktasz | 01-18-2007 09:15 AM |
Now everyone go back to your original post and add in if you daily drive on these rates or not :)
| crystalhelix | 01-18-2007 10:15 AM |
No...
| skuttledude | 01-18-2007 11:25 AM |
HKS custom spring rated Hipermax coilovers
450 lb/in (~8k) front, 400 lb/in (~7k) rear
Daily driver, BSP/SM Solo, HPDE track.
Kumho 710's and Hoosier
450 lb/in (~8k) front, 400 lb/in (~7k) rear
Daily driver, BSP/SM Solo, HPDE track.
Kumho 710's and Hoosier
| silver arrow | 01-18-2007 11:28 AM |
[QUOTE=waktasz;16712394]Now everyone go back to your original post and add in if you daily drive on these rates or not :)[/QUOTE]
I daily drive Tein Flex's and it is painful :banana:
I daily drive Tein Flex's and it is painful :banana:
| boost junkie | 01-18-2007 11:44 AM |
7k front, 5k rear on Ohlins coilovers
Whiteline bars, 27mm front, 24mm rear
235/45/17 Toyo RA1's
Daily Driver/HPDE
Next year I may run in NASA TTU, at which point I would have the coilovers revalved and run spring rates closer to 9k front, 8k rear.
Whiteline bars, 27mm front, 24mm rear
235/45/17 Toyo RA1's
Daily Driver/HPDE
Next year I may run in NASA TTU, at which point I would have the coilovers revalved and run spring rates closer to 9k front, 8k rear.
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