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Old 11-06-2003, 06:58 PM   #1
Makoto
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Default Eibach Pro Kit Springs vs. Progress Springs

In the market for some lowering springs and looking for your opinions on the above two products as those seem to fit my application the best.

My '03 WRX is my everyday driver and these springs will be used w/ my stock struts. Basically looking for an even drop and a slightly stiffer ride than stock to help out w/ brake and acceleration lurch.

I don't plan on any auto-x or racing applications, just everyday driving and enjoying the occasional mountain road. All opinions/knowledge are greatly appreciated including information about camber bolts, alignment issues, etc.
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Last edited by Makoto; 11-06-2003 at 07:05 PM.
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Old 11-06-2003, 08:09 PM   #2
mr2guru
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Progress springs will give you a more even drop than the eibachs

Eibachs also have a higher spring rate than the progress ones.
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Old 11-06-2003, 10:19 PM   #3
WillysPU
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Assuming this information is correct, you might check it out.

http://www.northursalia.com/t...ng/spring.html
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Old 11-07-2003, 01:54 AM   #4
Makoto
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mr2guru: As far as spring rates are concerned...is it the higher the spring rate, the stiffer the springs?

WillysPU: Thanks for the link, I'll check the mfg's site to make sure the info is correct.

I am definitely ready for something a bit stiffer than my stock suspension, just not ready for the coilover investment. Thanks for the info guys.

Mike
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Old 11-07-2003, 02:42 AM   #5
mr2guru
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Yes....

I don't have exact numbers but stock WRX is ~130f/120r

Stock STi is 192f/188r
Spec-c STi is 217f/198r
STi tarmac 252f/?r

Just for an idea....not exact numbers.

I have a set of stock STi springs for sale btw...
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Old 11-07-2003, 10:40 AM   #6
modvp
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Quote:
Originally posted by mr2guru
Yes....

I don't have exact numbers but stock WRX is ~130f/120r

Stock STi is 192f/188r
Spec-c STi is 217f/198r
STi tarmac 252f/?r

Just for an idea....not exact numbers.

I have a set of stock STi springs for sale btw...
Stock WRX is more like 168F/~120rear. JDM V7 Sti is ~188f/174 rear.
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Old 11-07-2003, 01:23 PM   #7
WillysPU
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You could start by getting either the Prodrive springs (not progressive) or eibach springs(progressive) and later upgrade your shocks to kyb or koni. Both of these set ups are excellent for raod and track conditions. The progressive springs tend to be a bit more forgiving (softer) at the top and stiffen as you lean into them. Both of these are stiffer than stock but not harsh.

I have the eibachs and just ordered kybs. I do about 8 track days a year and drive three kids to school . . . the set up works well for both applications!
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Old 11-07-2003, 01:48 PM   #8
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Quote:
Originally posted by WillysPU
You could start by getting either the Prodrive springs (not progressive) or eibach springs(progressive) and later upgrade your shocks to kyb or koni. Both of these set ups are excellent for raod and track conditions. The progressive springs tend to be a bit more forgiving (softer) at the top and stiffen as you lean into them. Both of these are stiffer than stock but not harsh.

I have the eibachs and just ordered kybs. I do about 8 track days a year and drive three kids to school . . . the set up works well for both applications!

A couple questions for you, are Progress springs made by Eibach? How did you like your Eibachs on stock struts? Did you blow them or just looking for something different? Last question...how did you decide on KYB's over Koni's? Thanks again for all your insight guys.

Mike
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Old 11-07-2003, 05:52 PM   #9
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prodrives are made by eibach, progress is not
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Old 11-07-2003, 06:05 PM   #10
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Yeah, I think WillysPU has never heard of Progress Springs and thought that I meant Prodrive. I knew Prodrives were made by Eibach, just don't like that they don't really lower the back end much.

Mike
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Old 11-08-2003, 02:21 AM   #11
WillysPU
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The eibachs are a nice upgrade from stock, firmer but not rockhard. On my sedan they lowered the car to a height of one finger over the rear tire and two over the front. If you plan to track the car you don't want to go down much more because you loose the amount of distance your suspension can travel before bottoming out. The eibachs are progressive so they are a bit softer on the easy stuff and stiffer once you get into them. I have tried the prodrives (not the progress) and the prodrives lower the car more than the eibachs and have a firmer ride. Actually, the prodrive shocks are a really nice firm ride, I would have gone with them if I knew about them.

I went with the kyb's because they are cheaper in price than the konis and their stiffest setting is stiff enough for track days (imho too stiff for daily driving). Hey, the konis are the best choice, but you may never drive to their ultimate stiffy setting ;> I have a couple of kids so I have to live within a budget.

Anyway, you can start with the springs and move on to the shocks. My stock shocks are just fine after 13K with the eibachs, but I really like that stiffer feeling of a high pressure gas shock. If you pull off your stockers you can compress them by leaning on them, not so with the kyb's or konis unless you weigh 250+.

I like to do track days and a stiff suspension is great on the track but can suck on the neighborhood streets. Since you said you don't plan to auto cross or do track days, you could probably go with the spring that lowers you the most and keep the stick shocks. That way you would be low and have a compliant ride.

An no, I have not heard of progress springs, but I have driven on prodrives on eibachs.
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Old 11-08-2003, 02:26 AM   #12
Makoto
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WillysPU--

The Prodrives drop the car lower than the Eibach Pro Kits? I was under the impression that it was the other way around.

Mike
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Old 11-08-2003, 02:51 AM   #13
WillysPU
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You're correct, prodrives lower a bit less. I hit "beer o'clock".

You may want to check out his site for some feedback,
http://www.subarureview.com/suspension.php
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Old 11-09-2003, 02:56 PM   #14
Makoto
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Quote:
Originally posted by WillysPU
You're correct, prodrives lower a bit less. I hit "beer o'clock".

You may want to check out his site for some feedback,
http://www.subarureview.com/suspension.php
Thanks for the link...looks like there is some useful info there. I think I'm leaning towards the Eibach Pro Kit's if I can get a good deal on them. Looks like World One has the best deal going right now.

Mike
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Old 11-12-2003, 12:52 AM   #15
Makoto
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Default Eibach's

Well, I picked up a set of Eibach Pro Kits. I like the drop and it seems like a good road to go for my circumstances.

Mike
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Old 11-14-2003, 09:09 PM   #16
sandiegowrx
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I saw someone say Progress=Perrin... is this true?
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Old 11-15-2003, 01:07 AM   #17
Makoto
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Quote:
Originally posted by sandiegowrx
I saw someone say Progress=Perrin... is this true?
Not that I have heard.

Mike
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Old 11-20-2003, 03:03 AM   #18
Makoto
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Got my Eibach Pro Kit's in the mail today...and they will be installed tomorrow night.

Mike
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Old 11-20-2003, 11:14 AM   #19
WillysPU
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Mike,

I think you will really like the Eibach. I drove them with stock shocks for 10k and they were great. Now I am tracking more often and I went with the KYX shocks with the Eibachs, they are great!!! I wish I would have put on the KYB's the same time I did the Eibachs to save the hassle, but then I wouldn't have realized just how good the eibachs are. For the most part the car just rides nicer and firmer and at the track they actually handle pretty well with the stock struts . . . .until you really start pushing the suspension in the corners.

Have fun and good luck with the install!

Jim
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Old 11-21-2003, 02:55 AM   #20
Makoto
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Default Install

Thank you to Arnie for helping me install these springs. He made it a real piece of cake. (Too bad my white collar hands couldn't take the "labor"). And, thanks to Arnie's heavy foot (chasing me down the freeway to torque make sure my lugs were torqued properly) he probably saved me from losing a wheel or two.

So far the ride is great. Very similar to stock, but w/ less lurch. At high speeds on bumpy fwy pavement it feels pretty bad, but I'm hoping that I was just being hypersensitive. I will post a much more extensive review in a couple weeks once I get a better feel for them. Thanks again Arnie.

Mike

Last edited by Makoto; 11-21-2003 at 03:01 AM.
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