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Old 03-22-2004, 04:07 PM   #1
jcroy66
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Default JIC spring rates for daily driver/autocross

OK, after some research, we're leaning towards the JIC FLT A2s. Now we have to decide what spring rates to get.

The car is an 03 WRX sedan and is my daily driver. I drive on northern Ohio roads. We have potholes. I don't want to end up with a permanently-bruised butt.

But I'm not a total wimp, either. And we're building the car for STX. We hope to hit at least one ProSolo and one National Tour this year. Maybe even Nationals. I'd like to have a shot at being competitive in the ladies class. So, I'd like to get some opinions, from people who have "been there, done that" BEFORE I shell out money.

OK, first off, before anyone suggests it, I have indeed already searched the forum for "JIC". I have also looked at the various online info that many of you have posted for your cars. I found some very useful info.

So this is mainly a follow-up discussion. I know Brian Flanagan, in particular, was discussing his spring rates for his daily driver/autocross WRX. And what was bearable with the JICs. So, Brian, have you settled on which spring rates were a happy middle ground?

Also, any other suggestions from anyone else? Right now, the salesguy we're dealing with is recommending either 8k/8k, 9k/9k, or 10k/10k. I know a number of you have different spring rates front vs rear. This guy was recommending that we get the same spring rates front/rear and play with RSB and FSB settings instead. Any suggestions/comments/etc about the positives/negatives?

So, suggestions from the Peanut Gallery about what spring rates will be bearable with the JICs?

Thanks in advance for any help!!

FWIW, our summer tires will be MXs for the first month or so of the season, then we'll be switching to 225/45/17 Azenis. Our winter tires are currently RE-92s, but will be snows next winter.
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Old 03-22-2004, 05:05 PM   #2
del105
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I think a little more spring in the rear is nice.
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Old 03-22-2004, 05:57 PM   #3
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For a no-compromise autox car, I'd run 8K front & 10K rear springs. However, this setup WILL NOT be pleasant as a daily driver. I know - that's how the FLT-A2's on my car are currently set up.

For a more comfortable everyday ride, you could try 6/7 or 7/8. The JIC's are still kinda bouncy on some surfaces, but the lower spring rates will make things more bearable.

IMHO - even front/rear spring rates work really well for a track setup, but a higher rear rate is preferabe for autox.

-Steve

[EDIT] If you want to experiment with springs rates, DON'T buy the JIC springs! Their prices are outrageous. You can pick up 2.5" ID Eibach ERS or Hypercoil springs in the correct lengths (8" F/R for old models, 8" F / 10?" R for the new long-stroke models) a lot cheaper. BTW - I have some extra 7K & 6K 8" JIC springs I'd sell cheap! [/EDIT]

Last edited by MNbiker; 03-22-2004 at 10:39 PM.
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Old 03-22-2004, 09:18 PM   #4
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I have had the 10K/10K setup for nearly a year now. The car rarely sees the street., basically to/from events and the occasional weekend jaunt. Stiff as hell. Not a great street sus. but performs very well at auto-x/track days. I'm thinking about going higher with the rates sometime down the road.
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Old 03-22-2004, 11:55 PM   #5
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Same opinion here. I've got 8/10 and its pretty brutal for the street. For Miranda, who has a #1 street/#2 autox/#3 track STi, I'm recommending 6/5 with big swaybars. On the STi you don't need a equal or higher rear rate IMHO because of the diff. The car has NO problems transitioning to oversteer/neutral in the middle of the turn unlike the WRX. The bigger rear bar will do plenty for turn in. In the WRX, I think a 6/7 would be a good rate.

We're going to try GC sleeves on the stock STi shocks. Since the STI pink springs are ~250lb and work well on the STi, I think the stock STi shocks should be able to handle the 330lb (6K)/285lb (5K) rates just fine.

-Tom

Last edited by trhoppe; 03-23-2004 at 12:03 AM.
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Old 03-23-2004, 02:05 PM   #6
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10/10 is nice. i think 8/10 would be better for street tires (stx). both will provide good oversteer.

-spenc
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Old 03-23-2004, 04:40 PM   #7
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For daily driving, I wouldnt go anything stiffer than 6k in the front on a subaru. I would do 6k/7k.
Its very stiff (girlfriend complains) but not brutal.


(btw Spenc, wheelrates on Subarus are very different than on Hondas. 6k=330lb on my WRX was dramatically stiffer than RJ's 600 lb springs on his integra0
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Old 03-23-2004, 04:41 PM   #8
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spenc is my co-driver/lackey at many events so he knows what the 10K rates feel like.
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Old 03-24-2004, 07:17 PM   #9
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Quote:
Originally posted by MNbiker

[EDIT] If you want to experiment with springs rates, DON'T buy the JIC springs! Their prices are outrageous. You can pick up 2.5" ID Eibach ERS or Hypercoil springs in the correct lengths (8" F/R for old models, 8" F / 10?" R for the new long-stroke models) a lot cheaper. BTW - I have some extra 7K & 6K 8" JIC springs I'd sell cheap! [/EDIT]
Just did a little measuring on my new JIC's that showed up today. The rears are 225mm (~9") in length, the ID is 62mm which is darn near 2.5"

I have a Truechoice catalog that lists the Eibach ERS's and the only 9" lengths have a 2.25" ID.

Needless to say, I'm bummed right now. I was hoping to have them on the car on Friday with different rears. Heck, JIC only makes the 225's up to 6kg.

Last edited by Orion; 03-24-2004 at 07:27 PM.
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Old 03-24-2004, 07:52 PM   #10
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Quote:
Originally posted by Orion
Just did a little measuring on my new JIC's that showed up today. The rears are 225mm (~9") in length, the ID is 62mm which is darn near 2.5"

I have a Truechoice catalog that lists the Eibach ERS's and the only 9" lengths have a 2.25" ID.

Needless to say, I'm bummed right now. I was hoping to have them on the car on Friday with different rears. Heck, JIC only makes the 225's up to 6kg.
You could order some helper springs for the rear and go with an 8 inch spring.
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Old 03-24-2004, 09:55 PM   #11
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Hmmmm, you can probably put a 10" spring in there but you'll have to adjust your rate down a bit since it'll be compressed down to 9" before the car puts any load on it...

http://www.bluecoilspring.com/coil-over.htm

(I'm not a customer, just saw these guys mentioned once on Special Stage and bookmarked the site). They might be able to custom-wind 9" springs too...
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Old 03-24-2004, 11:19 PM   #12
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I have been all over the place with spring rates. The 7k/10k combo was my fave for autocross but sucked on the street, even for someone who doesn't mind a stiff car. Strangely, potholes were fine but small undulations (nearly invisible to the nekkid eye) had you bouncing like a friggin' trampoline!

I have gone back to my 350#F/450#R eibach springs (6.5/8k? Not sure of the conversion) and am pretty happy. Not too bad on the street, and I don't feel like I'm giving up much on the A/X course either. I ran 220+ miles at L'il Talladega last weekend, and it felt great there too after softening up the big rear bar, shocks, and removing some of my big, fatass toe-out!

Your butt tolerance may vary, though...

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Old 03-25-2004, 09:26 AM   #13
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Quote:
Your butt tolerance may vary, though...


-Tom
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Old 03-25-2004, 10:10 AM   #14
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How do you guys do that #k coversion into #lbs.? I was thinking that 8k/7k f/r wasn't that stiff at all, maybe stiff like the STi I was assuming.
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Old 03-25-2004, 10:28 AM   #15
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kg/mm X 56 = lb/in

8K = ~450
7K = ~400

-Tom
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Old 03-25-2004, 10:34 AM   #16
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I have what was probably the first set of FLT-A2 Race specs sold in the US. They were originally on my RS, and were converted over to fit the WRX. The Spring rates are 8f/8r. It was fine on the RS, but I am going to go to a 10k rear spring now on the WRX. The car just doesn't want to rotate quite enough on an autocross course. For road racing or daily, I would recommend staying with the same rates front and rear.
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Old 03-25-2004, 10:40 AM   #17
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Looky there, Kent agrees with me on something else

-Tom
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Old 03-25-2004, 12:07 PM   #18
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One thing you can do to get away with really stiff springs for racing but still be streetable, is get some soft sidewall crap tires for the street.


stiff springs + azenis = holy crap!

stiff springs + re92s = no big deal
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Old 03-25-2004, 01:25 PM   #19
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Quote:
Originally posted by jmott
One thing you can do to get away with really stiff springs for racing but still be streetable, is get some soft sidewall crap tires for the street.


stiff springs + azenis = holy crap!

stiff springs + re92s = no big deal
I rode in Tom's car one day on RE92s and was like "I don't get it, what's the big deal with huge spring rates? Doesn't feel that bad to me" but then realized the tires he was on...
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Old 03-25-2004, 01:31 PM   #20
jcroy66
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You guys have been exceptionally helpful! Thank you very much!!

After the recent discussion on tires making a big difference in how the ride actually feels, my husband has finally talked me into starting out with the 8/10 springs.

I figure if it's just unbearable, then at that point, we can either:

1. Buy springs with lower spring rates. If we do that, we'd likely keep the high spring rate springs too and just switch to them for the National-level events.

2. Just switch tires before and after events. Hey, we had 3 sets of tires (street, race, and winter) for the Celica for years, I guess we could do that for the WRX too. Even if we are in a "street tire" class.

Anyway, thank you all for your help!! Mucho appreciated!!

Last edited by jcroy66; 03-25-2004 at 01:36 PM.
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Old 03-25-2004, 02:08 PM   #21
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I think you find that all the people that do national level events have a set of autox and a set of street tires for their ST* class cars.

-Tom
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Old 03-26-2004, 06:40 AM   #22
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Quote:
Originally posted by trhoppe
I think you find that all the people that do national level events have a set of autox and a set of street tires for their ST* class cars.

-Tom
'cept for those of us whose cars have become trailer queens!

-Steve

p.s. of course, I STILL have 3 sets if wheels/tires!
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Old 03-26-2004, 07:42 AM   #23
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Hell, I have 4 sets of wheels and I'm in STS with my RS.
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Old 04-11-2004, 01:52 AM   #24
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any thoughts on a 7/6 spring rate ?
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Old 04-11-2004, 08:19 AM   #25
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Quote:
Originally posted by samwY
any thoughts on a 7/6 spring rate ?
I like 7/7 better. For general use, I'm a proponent of even spring rates.

-Steve
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