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Old 07-24-2011, 10:10 PM   #1
Messier77
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Default 2010 WRX + Koni Inserts+ Stock Springs - Harsh ride with passengers/weight

I have a 2010 WRX hatch with Konis and stock springs. The Konis are awesome and the ride is perfectly acceptable when I'm driving alone. I keep the Konis on full soft.

However, I've found that with each passenger I add (or the more stuff I carry), the ride gets far worse. With a full car, the ride is unacceptable and crashes and smashes harshly over any bump. It is especially bad on the highway. My family and friends have commented on how harsh the ride is. The difference between with passengers/weight and solo is definitely noticeable.

I'm wondering if this is because the car is significantly overdamped with the stock springs and the Konis. Are the stock springs overwhelmed trying to match the Konis when the car has passengers/weight? Would I benefit from somewhat stiffer springs?

In that vein, how would moderately stiffer springs change the ride? Would it still be reasonably daily drivable? Finally, any recommendations on springs that have little or no lowering? I'm definitely not looking to lower the car at all, as I already have enough clearance issues when driving around rural PA in the summer. Thanks for the help.
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Old 07-24-2011, 10:43 PM   #2
Back Road Runner
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Well first off, I'd work on setting the damper correctly. It ONLY adjusts rebound, and you are NOT tuning it for bump comfort but setting it high enough to properly control the chassis (as to not be bouncy). The bump damping is fixed, so there really is nothing at all you actually do there. You simply adjust the rebound as needed to adequately damp the chassis.

"Crashing" is mainly a factor of bottoming out. This isn't a damper setting issue, and yes it gets worse as you load down the car. The less bump travel you have, the easier it will bottom out.

The fix is achieving more bump travel, and this generally means a taller ride height. A taller spring or a stiffer spring that doesn't drop the height excessively will work, yes. I wish I could say what was available for the newer chassis cars, but I don't. I'm not sure how many manufacturers have actually produced upgrade options for the newer chassis cars. I believe RCE does have springs made, so I would point you towards them as an option.
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Old 07-25-2011, 06:44 AM   #3
Messier77
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BRR, thanks for the informative and helpful reply.
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Old 07-25-2011, 09:04 PM   #4
Messier77
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Bump for any non-lowering spring recommendations.

Speaking of such springs, anyone know if the RCE blacks for the 08+ STI fit the WRX?
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Old 07-25-2011, 09:23 PM   #5
n2oiroc
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adjust the struts first. give them 1/2 a turn each stiffer and see what it does.
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Old 07-25-2011, 10:16 PM   #6
Messier77
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Quote:
Originally Posted by n2oiroc View Post
adjust the struts first. give them 1/2 a turn each stiffer and see what it does.
Just adjusted them a half turn stiffer. Will see how that works tomorrow. Thanks for the advice.
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Old 07-25-2011, 10:44 PM   #7
Mikebravo
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really like to see how this turns out. Either going this route or GTworx.
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Old 08-05-2011, 12:26 PM   #8
n2oiroc
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Quote:
Originally Posted by Messier77 View Post
Just adjusted them a half turn stiffer. Will see how that works tomorrow. Thanks for the advice.
update?
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Old 08-05-2011, 06:26 PM   #9
Feal Suspension
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I suspect that there is too much rebound damping and the shocks/struts are "packing" (the suspension is not returning after a compression fast enough). I have seen cars with so much rebound damping that they start riding on bump stops after a series of bumps during heavy braking.

You are adding sprung weight to your car when you carry passengers. The only way to keep the ride quality constant is to decrease rebound damping or raise spring rate.
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Old 08-06-2011, 10:27 AM   #10
Messier77
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Quote:
Originally Posted by n2oiroc View Post
update?
Well, I have not had the chance to ride with passengers since changing the stiffness of the Konis. Says a lot about my life, right?

Here are my solo driving impressions though. The handling is even better, especially on quick and tight maneuvers, but the ride is definitely, noticeably stiffer. I can only imagine how awesome it would be on full stiff at the track.

Will report back when I get passengers to ride with me.
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Old 08-06-2011, 10:31 AM   #11
Messier77
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Quote:
Originally Posted by Feal Suspension View Post
I suspect that there is too much rebound damping and the shocks/struts are "packing" (the suspension is not returning after a compression fast enough). I have seen cars with so much rebound damping that they start riding on bump stops after a series of bumps during heavy braking.

You are adding sprung weight to your car when you carry passengers. The only way to keep the ride quality constant is to decrease rebound damping or raise spring rate.
I'm thinking about picking up a set of custom King rally springs that are a few mm taller than stock height with progressive spring rates, starting around stock and ending 50% stiffer than stock. Think that would match up well?

Also, FYI, I was bottoming out without any passengers on a daily basis on the highway when riding on the stock suspension and hitting even medium sized potholes. I hate Northern NJ roads. So the Konis have helped a lot in that regard.
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Old 08-06-2011, 10:50 AM   #12
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another option would be 2011 sti springs. from what i hear the change in ride height is very minimal and they are quite a bit stiffer. i picked up a set but havent installed them yet.
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Old 08-06-2011, 10:56 AM   #13
Messier77
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I thought 08+ STI springs dont play so nicely with 08-10 wrx in the front? Not sure where I heard that though.
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Old 08-06-2011, 12:34 PM   #14
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Not sure if this applies to the new cars but on my year you lose some bump travel with the Koni inserts. That might be why your hitting the stops loaded.

Stiffer spring that do not lower the car should help - I have been running STi springs on my 2003. They are a bit harder over bumps but I got used to it. My ride height stayed pretty much stock.

The other option is to see if these bump travel extenders help: http://turninconcepts.com/product_in...roducts_id=458. They are designed to compensate for the lose of travel mentioned above. You'll need to verify they fit your year.

BTW, I think adding rebound stiffness will just make things worse.
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