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post #41 of 245 (permalink) Old 10-02-2013, 05:42 PM
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Originally Posted by clemsonmz3 View Post
Mmhhmm. I think my KW/MS kit is great but if I could go back and do my suspension again Bilstein B16 PSS9's would get a good long look. Can't beat the price either for a plug-and-play, easy button option.

I was told by a friend that FatCat Motorsports have vast experience rebuilding/revalving Bilsteins PSS's. They are a good reputable outfit.
Yeah, off the shelf coil-overs definitely have their fans because it is easy (just order them up and bolt them to the car) and some people might be impressed by fancy knobs. It is tempting to just order up some PSS9's with a few clicks and get them the next week. I haven't ruled out that option yet. People also typically pay more for the "convenience" and it's more expensive than the ground control route especially if you already have Koni's/Bilsteins. Going the custom valve route is more of an inconvenience because you have to pack your shocks up and send them off somewhere and wait 1-2 months typically. Also you have to do your homework ahead of time because if you want to change spring rates later on, the shocks are no longer matched to the springs.

I emailed Shak over at FatCat on a quote for a custom valve job and he never got back to me. I hear he does good work but he's also way over-priced. I'm sure Bilstein does good work on their own stuff too, and I'm thinking they charge around 1/2 as much as Fatcat. I may call up there and get a quote on the phone because I'm just curious. As the name suggests go with Fatcat if money is no object.

Last edited by Adam3s; 10-02-2013 at 05:50 PM.
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post #42 of 245 (permalink) Old 10-02-2013, 06:28 PM Thread Starter
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Getting your shocks matched to your spring rates to get the natural frequency at 1 to 1.5 or whatever you want is the key, that site strongly urges it lol. This is part of the reason I am leaning towards the koni route, with both options, i'm going to ensure they are valved appropriately from the springs I'm going to run. (that too is also still up in the air. I was thinking something in the ballpark of 450f/375r)

What spring rates are you guys running/planning on running?

EDIT: I just called GC too (just to confirm/double check) and they said they have them and should be available within the next month. Front and rear spring perches with springs (eibach presumably). This means I'll be checking the site pretty regularly over the next few weeks lol. This also might have been a deciding factor. Have koni north america custom valve my yellows, order camber plates and gc sleeves. then order the springs I want. (unless the kit can come with spring rates I want)

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Last edited by dgross7; 10-02-2013 at 06:37 PM.
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post #43 of 245 (permalink) Old 10-02-2013, 11:17 PM
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You may also want to match your spring rates to sway bar stiffness, I believe. But don't take my word for it, I'm not an autoX guy or anything. I've just had somebody mention something to that effect to me once before.

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post #44 of 245 (permalink) Old 10-02-2013, 11:52 PM Thread Starter
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iirc, you can counter lack of spring rate with sway bar. But that is easy enough to adjust. I'll probably be purchasing a tri point rsb this winter as well.


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post #45 of 245 (permalink) Old 10-03-2013, 12:01 AM
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Oh is spring rate adjustable with these coil overs? Because the guy who mentioned it to me before said that the upper stiffness of the CS bar was approaching too stiff with his springs, and CS's upper stiffness level is below the lowest of the Tri-Point I believe.

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post #46 of 245 (permalink) Old 10-03-2013, 10:10 AM Thread Starter
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spring rates are adjustable in a sense that you can take out springs that are too stiff or too soft, and put in a different spring with a different rate. There is not a knob to adjust spring rate on the fly or something.

My guess is he had really stiff springs as well. Like I said, sway bars can counter lack of spring.


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post #47 of 245 (permalink) Old 10-03-2013, 11:03 AM
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Ahh, I see what you're saying. Though, I thought stiffer sways actually made it seem like you had stiffer springs and that the two had a cumulative effect with each other.

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post #48 of 245 (permalink) Old 10-03-2013, 11:57 AM
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Spring and sways do have a compounding effect, but only in the lateral direction.

Higher spring rates will resist body roll in both directions(for/aft and side to side). In doing so, it will lesson brake dive and squat when applying power, as well as lateral body roll when turning.

Sway bars(obviously) only come into play laterally. TECHNICALLY, you could generate enough roll stiffness with springs alone, but nobody does because then spring rates wouldn't allow enough weight transfer for proper brake balance. Even purpose built race cars (F1 for example) use sway bars.


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post #49 of 245 (permalink) Old 10-06-2013, 10:17 PM Thread Starter
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The last solo championship event of my region was today, videos are uploading as we speak.

Only my first two runs were clean, second run was my fastest of the day.






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Last edited by dgross7; 10-07-2013 at 02:23 AM.
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post #50 of 245 (permalink) Old 10-14-2013, 09:50 AM
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I'm sure Bilstein does good work on their own stuff too, and I'm thinking they charge around 1/2 as much as Fatcat. I may call up there and get a quote on the phone because I'm just curious. As the name suggests go with Fatcat if money is no object.
I had Bilstein rebuild/revalve the shocks on my SVT Focus last year. Good prices, great customer service and reasonable turnaround time. It took about a month total to get my shocks back (not bad considering 2 weeks worth of shipping time). The winter is their busy time as everyone is getting their stuff rebuilt over the winter.

They just revised their pricing but its still pretty reasonable.

http://www.bilsteinus.com/products/s...rvice/service/
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