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Old 05-16-2008, 10:05 AM   #1
qualityracer
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Default how do you make ride less bumpy (Swift springs on GR2s)

So I just have the brand new KYB GR2 and Espelir springs put in my 02 impreza... and the ride is bumpy, even though it is not as bumpy as it was in stock suspension....

stock suspension felt like if I was going off the air every time when I drive through those little tiny hill section on the road _____/ , of course not that steep... now the new suspension , every time when I drive though those, I can't feel that, but the feel of going over bumps/ bad road is still the same....

If I put a small cup of 50% filled cofee on the cup holder above the CD player while driving through bad roads /bumps , the cofee would be spilling out everywhere..... same apply while driving through that _________/

anything I can do about it?
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Old 05-16-2008, 10:08 AM   #2
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First off, those springs are probably too stiff for those dampers to handle. I think those are somewhere closet o 300# springs which is more in the range of a Koni or Dspec or KYB AGX strut.

Secondly, did you cut the bumpstops at all? You are probably riding them as I think lower the car a good bit.

Tony
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Old 05-16-2008, 10:10 AM   #3
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my shocks did not come with any bumpstops, so I use the OEM one, but I did not cut them, should I cut them? what is the effect? what spring do ya recommend for these GR2 shocks? would the Espelir springs shorten the life of the shocks?
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Old 05-16-2008, 02:44 PM   #4
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The GR2 struts are about 15% stiffer than stock. Useful spring rates for this are about 200 lb/in max, and better something closer to 180 lb/in. You might want to look at the Prodrive blue WRX springs. They're 175 lb/in all around and would probably match quite nicely with the GR2 struts.

Now the Espelir springs come in a few varieties.
ESA045 3.3k front 2.6k rear (WRX vers)
ESA045A 4.5k front 3.5k rear (STI vers)
ESG045A 5.0k front 4.1k rear (STI vers)

A quick and dirty relation to lb/in is you can multiply Xk by 56 to get Y lb/in.

You'll also notice stock is in the range of 2 to 2.5k, and you really don't want to go much past 3k on stock struts. 300 lb/in is a 5k spring and WAY outside of the range of the stock strut. If you got the ESA045, it should ride ok. If you got either of the others, you'll need more dampening. As well, the ESA045 only drops 20mm which isn't all that bad. The other ones do drop a little more but are also stiffer.

Don't think about the bump stops. They're not your problem. You just have to run a spring/damper combo that actually matches.

Of course, expect some increased ride harshness from running stiffer springs/dampers. That's just normal. It would be useful to look at tires as a route to modify the ride comfort. I know most folks like to run large wheels and no sidewall, but that's a large cause of the rough ride. In stock form, the suspension soaks up a lot. Modified, this duty goes back to the tires, so you will want a little sidewall and tires that do well soaking up road imperfections.
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Old 05-17-2008, 12:38 AM   #5
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yes, it was the ESA045

what do you recommending me to do to make it less less less bumpy?

Last edited by qualityracer; 05-17-2008 at 12:48 AM.
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Old 05-17-2008, 01:30 AM   #6
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There's not much you can do other than to change springs or change struts. The springs you're running are just way WAY too stiff for the GR2's. You're going to have to get something that matches better.
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Old 05-17-2008, 09:48 AM   #7
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Tein S tech? Skunk 2? Tanabe NS210? Eibach? Cobb sport?


which one would likely to make it the most comfortable ride?

btw, my cousin has a coilover setup on his 03 wrx[good stuff, forgot the brand, costed him 1k something], and the ride quality isn't much better than my current ride neither

so by comparing my ^ " make it most the comfortable ride" should I expect it to improve my car's current condition, however it wouldn't exceed the coilover's comfy? he told me that his coilover is for street use, and it's the best street coilover out there.

Last edited by qualityracer; 05-17-2008 at 09:59 AM.
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Old 05-17-2008, 10:39 AM   #8
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well my thoughts are either...

A: sell the Espelir springs and buy prodrive blues to match the gr2 strut much better and have a pretty comfortable ride.

B: Keep the springs and sell the gr2's for some tokico d-specs and have a slightly stiffer yet still correctly dampened ride.

the spring route would be cheaper as you could probably make 50% of your money back after selling the espelir's.
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Old 05-17-2008, 10:55 AM   #9
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other than prodrive blues, what other springs that I've listed would be suitable for the match?
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Old 05-17-2008, 11:55 AM   #10
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None. The prodrives are going to be your best option. Aside from that there are some swifts made for the wrx that would work well.

Tony
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Old 05-17-2008, 12:04 PM   #11
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what are those "some swifts" that you are talking about? I just checked the price on the prodrive... lol, I mighta just go back to stock from now, and grab the Tokio HP setup later. good??? how would the stock springs drive on the GR2?

Last edited by qualityracer; 05-17-2008 at 12:12 PM.
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Old 05-17-2008, 01:42 PM   #12
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Quote:
Originally Posted by qualityracer View Post
Tein S tech? Skunk 2? Tanabe NS210? Eibach? Cobb sport?
With the GR2's your only options are going to be stock WRX springs or the Prodrive blues. Those struts just aren't meant for stiffer springs.

And don't get the S.Techs. They're the worst springs in the history of mankind.


Quote:
btw, my cousin has a coilover setup on his 03 wrx[good stuff, forgot the brand, costed him 1k something], and the ride quality isn't much better than my current ride neither
so by comparing my ^ " make it most the comfortable ride" should I expect it to improve my car's current condition, however it wouldn't exceed the coilover's comfy? he told me that his coilover is for street use, and it's the best street coilover out there.
If he paid $1k for them, they're crap coilovers and that's the biggest reason why the ride sucks. He's full of **** telling you they're "the best out there". Coilovers with decent ride START above $2k and go up FAST from there.

For a good ride, you either need to get some softer spring to use with those struts, or get some better struts to go with your springs. There's no way around it.
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Old 05-17-2008, 01:46 PM   #13
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Quote:
Originally Posted by qualityracer View Post
what are those "some swifts" that you are talking about? I just checked the price on the prodrive... lol, I mighta just go back to stock from now, and grab the Tokio HP setup later. good??? how would the stock springs drive on the GR2?
swift springs
http://www.fastwrx.com/swiftsprings.html

if your wanting the tokicos down the road you would need the tokico d-spec not the HP. The HP is pretty close to what you have now in the GR-2.

And yes the stock springs would ride fine on your gr-2's just not going to be low.
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Old 05-17-2008, 02:34 PM   #14
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can I cut them low? whahahahhahaha lol I think I got the idea...
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Old 05-17-2008, 02:54 PM   #15
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Quote:
Originally Posted by qualityracer View Post
can I cut them low? whahahahhahaha lol I think I got the idea...
No, springs should never, EVER be cut. Other than one specific method of cutting them, it's incredibly dangerous and makes the spring likely to fail. Even if you have the tech to cut them properly, the result will be complete and total crap.
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Old 05-17-2008, 03:06 PM   #16
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you have bad humor... lol , thx for all your helps
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Old 05-17-2008, 05:37 PM   #17
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There ARE a couple of unmentioned options. There are the ubiquitous STi takeoffs(which would require a rear tophat swap and spacers) but would live on the GR-2's or the Mach V Motorsports "blues" which are very similar in rate to the Prodrives but with a little less drop.
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Old 05-17-2008, 06:26 PM   #18
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does that apply on 04 sti? not the sti pink, correct?
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Old 05-17-2008, 07:41 PM   #19
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Yes all the USDM STi spring rates are the same @ 224f/193r. I'm not sure if the stock rideheight on a 2.5i is the same as a WRX, but they will lower a WRX about 15-20mm. They would require you to put 04+ tophats(tophat year and spring year do not need to match as long as they are both 04-07) and run the TiC spacers. JDM STi "Pinks" are quite a bit stiffer than the OEM USDM STi springs.
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Old 05-17-2008, 10:38 PM   #20
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Quote:
Originally Posted by QuikWgn View Post
There ARE a couple of unmentioned options. There are the ubiquitous STi takeoffs(which would require a rear tophat swap and spacers) but would live on the GR-2's or the Mach V Motorsports "blues" which are very similar in rate to the Prodrives but with a little less drop.
The GR2s aren't going to be properly damped for the USDM STi take offs either. Better than what he has now, sure, but still not right.
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Old 05-17-2008, 11:10 PM   #21
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Plenty of members run STi takeoffs on WRX struts and the GR-2's are 10-15% stiffer still.
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Old 05-17-2008, 11:25 PM   #22
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Quote:
Originally Posted by QuikWgn View Post
Plenty of members run STi takeoffs on WRX struts and the GR-2's are 10-15% stiffer still.
Plenty of members run S.Techs on stock struts.


Just because people do it doesn't mean it's right.
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Old 05-18-2008, 02:49 AM   #23
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I guess I would just switch back to OEM spring from now, and waited until later in the summer to get the prodrive blue.... one more question... would these Espelir damage my shocks if keep using? not sure if it's gona rain or not, if it is, then I have to wait until next sunday...
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Old 05-18-2008, 02:50 AM   #24
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Quote:
Originally Posted by qualityracer View Post
I guess I would just switch back to OEM spring from now, and waited until later in the summer to get the prodrive blue.... one more question... would these Espelir damage my shocks if keep using? not sure if it's gona rain or not, if it is, then I have to wait until next sunday...
Over time, yes. However, in the amount of miles a normal person drives in a week, no way in hell. You're fine waiting.
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Old 05-18-2008, 03:03 AM   #25
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will there be any improvement comparing the stock shocks + stock springs VS GR2 + stock springs?
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