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Old 06-16-2014, 08:14 AM   #1
DannyD303
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Default Different springs on front and rear

Hey guys,
another question/opinion.

I just installed Tein H-tech spring with Koni inserts on my 04 WRX. I did the front 2 weekends ago and the rears this past weekend. The thing is I dont like the way my car sits now. I liked the way my car sat with the Teins up front but not in the rear. When I had the stocks springs the car looked like the back sagged more than the front. Now its looks similar but just lower (obviously). However when I had the stock springs in the rear the front was just slightly lower than the rear, which I like.

So in short, is there any reasons why I shouldnt run different springs front and rear? And if so does anyone have any ideas as to why my back end sags so much? I thought it was just my struts going bad but now that I have Koni's on all four I thought it would help.

Let me know, thank you NASIOC
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Old 06-16-2014, 08:18 AM   #2
Uncle Scotty
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i ran my 02 with mismatched springs for years....worked just fine....gonna do it again here soon, too
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Old 06-16-2014, 08:19 AM   #3
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I don't know what the spring rates of the H-techs are compared to the stock springs, but if they're not too different, then it wouldn't hurt to put the stock springs back in the rear. It'll monkey with the handling a bit - probably want to understeer more, since I'm guessing the stock springs are a bit softer than the Teins.
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Old 06-16-2014, 08:52 AM   #4
DannyD303
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Quote:
Originally Posted by Patrick Olsen View Post
It'll monkey with the handling a bit - probably want to understeer more, since I'm guessing the stock springs are a bit softer than the Teins.
I'm thinking, and hoping, that I can dial in my suspension with the adjustable dampening with the Koni's

Uncle Scotty - did you notice any weird handling character differences?
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Old 06-16-2014, 10:44 AM   #5
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Quote:
Originally Posted by DannyD303 View Post

I'm thinking, and hoping, that I can dial in my suspension with the adjustable dampening with the Koni's
You adjust the Koni's to the spring.

They are not used to "stiffen" things up. That's done with the springs. You will over damp the springs if you "crank" them up in a light spring rate. That's not a good thing. In certain cases the over damped spring will "float" once compressed and will not follow the pavement (or dirt/gravel etc.) surface.

Choose the springs, then adjust the Koni to match. Then leave the Koni alone.
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Old 06-16-2014, 11:19 AM   #6
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The damper is only there to, you guessed it, dampen the spring. As Bikelok said, you don't tune the damper to try and make your suspension softer or stiffer. Even though it may feel like that, that's not what it's doing. All you're doing is going for under-damped, over-damped (really no reason to have this), or striving for critically-damped.

Having a stiffer spring up front will promote the front end to wash out first, so yes, understeer. Just driving around town, it won't be noticeable, though.
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Old 06-16-2014, 02:19 PM   #7
Patrick Olsen
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Damping adjustments are most certainly used to adjust handling characteristics. Admittedly, the single adjustable Koni inserts aren't the best option for doing that, but it still works.
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Old 06-16-2014, 02:23 PM   #8
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Sounds like I'm just going to have to deal with the ride height in the rear and do a little more research with these Koni's
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Old 06-16-2014, 02:48 PM   #9
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Why not just get saggy but spacers then you will have same springs front and rear and the ride height you are looking for.
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Old 06-16-2014, 03:51 PM   #10
Bikelok
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Quote:
Originally Posted by Patrick Olsen View Post
Damping adjustments are most certainly used to adjust handling characteristics. Admittedly, the single adjustable Koni inserts aren't the best option for doing that, but it still works.
Handling characteristics yes, but not used to make whole changes in firmness.

If he cranks up the dampening on the Koni, he will loose traction, as the wheel will not be able to move with the road surface fast enough.

With compression and rebound adjustments (not available with the Koni), you can help a spring along, but really you should pick the proper spring rate first and can then fine tune it with the damper for specific needs.
Just my two cents.
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Old 06-16-2014, 07:01 PM   #11
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Quote:
Originally Posted by novacivic View Post
Why not just get saggy but spacers then you will have same springs front and rear and the ride height you are looking for.

that does nothing for increasing travel
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Old 06-17-2014, 08:55 AM   #12
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with spring and damping rates actually balanced properly front to rear, the one handling issue with a lower front (even gaps) that was apparent to me was how difficult trail braking on track became. I had fresh coilovers on, and they settled out that way before I re-adjusted height. Under braking, the steering wheel was too heavy to turn at all until I had all but fully released the brake pedal. I never noticed this on the street. but as soon as that was corrected, I was surprised at how much better the handling felt everywhere.
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Old 06-17-2014, 01:39 PM   #13
DannyD303
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So basically the adjustment is only there to perfectly match the bounce to the spring rate. I get that now.

But going back to my original question there should be no issues with putting different springs front to rear?
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Old 06-17-2014, 02:28 PM   #14
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It will work.

Give it a try, if you don't like it then switch them out.
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Old 06-17-2014, 02:29 PM   #15
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Thank you
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Old 06-17-2014, 10:09 PM   #16
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I don't know exactly what fits your year but I expect there are STi takeoffs you could get cheap for the rear, which would give you higher rates and almost no drop. You can also order pink springs individually, like this: http://www.fredbeansparts.com/sti-su...-set-rear.html

I run different springs front and rear now. It allowed me to do a bit of tuning and seemed to help.
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Old 06-19-2014, 01:43 PM   #17
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I'd say go with a 3/8" spacer in the rear.

Unless you want it higher than that.
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