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Coil Overs????

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Old Apr 17, 2007 | 07:17 PM
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Default Coil Overs????

Guys Im about to buy a trans am and the first thing Im gonna do is suspension and I really wnt the car to handle well but the problem is I LOVE the look of a slammed trans am.

I hear the sportlines are to soft and its hard to get sphocks that can damp the springs well.

I was thinking of runnin GC coil overs and set them up for a 1.75 inch drop, what kind of spring rates shoudl I order and can Bilsteins be revalved to handle this?
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Old Apr 17, 2007 | 08:52 PM
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Originally Posted by TAEnvy
Guys Im about to buy a trans am and the first thing Im gonna do is suspension and I really wnt the car to handle well but the problem is I LOVE the look of a slammed trans am.

I hear the sportlines are to soft and its hard to get sphocks that can damp the springs well.

I was thinking of runnin GC coil overs and set them up for a 1.75 inch drop, what kind of spring rates shoudl I order and can Bilsteins be revalved to handle this?


spring rates depend on what you want to do with the car. the good thing about the GC's is that its like $50 to replace the springs if what you have is too soft/firm for you. bilsteins are not ideal on a coilover like setup. think about it like this:

Bilstein HDs are meant to be used for stock springs
Revalved bilsteins from Strano are custom valved per what springs you have, and how you drive the car (DD for comfort, or canyon carving warrior)

so if you have a coilover setup where you can adjust the height and change the spring rates; bilsteins don't do you much good unless you never change your ride height (which eventually you may want to) or you love the spring rates and never change that (which is a crap shoot of you don't really know what you want)


your best bet shock wise are Koni S/As
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Old Apr 17, 2007 | 09:27 PM
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I dont plan on screwin with ride height really as I would have to realign my car every time. I just want to do Coil Overs so I could get the ride height and spring rate I want, not for heigth customization.


I was wondering if the Bilsteins have the potential to be revalved and work well with a setup like this?
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Old Apr 18, 2007 | 09:42 AM
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no body
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Old Apr 18, 2007 | 11:13 AM
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yes they can be, but it wouldn't be easy. call Sam Strano and he can give you a beter idea or suggestion.
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Old Apr 18, 2007 | 11:42 AM
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Call Sam.

Best bet is GC coilover up front, with Koni SAs. Also, GC spring perches in rear, with Bilstein revalves (you won't change the rear rate that much, so a revalve should be fine).
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Old Apr 18, 2007 | 12:03 PM
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1.75" is too much drop. Shocks cannot fix too little working travel, or the associated geometry changes. Spring rates would have to be much different than what GC wants to sell everyone (and need to be different than what they push @ a higher height).

I can't help you by e-mail. I can only tell you that your plan is somewhat cobbled together and doesn't address some important points regarding a properly working suspension.
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Old Apr 19, 2007 | 02:05 AM
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My setup works very well for a 26" fender lip height. I have 550lb springs and Koni SA shocks. I only have 2" of compression travel, but it still rides fine. The GC kit for the front with Koni SA shocks will give you all the adjustment you need. Playing with the ride height is very important. You may start out too low, like I did. Doing a little driving around at a height without aligning the car is fine. If you scrape on a lot of things you may want to raise it 1/4" or so a try it out again. Once your sure you have the right height, then get the car aligned.

The SA shocks can make a huge difference in the way the car feels. If your picky about this at all, then get them. It will be worth it.

In the rear I saved some money by using the stock springs and just trimming them to lower the car and get the ride height I wanted.

Here is what my ride height looks like, 26" front and 26 1/4" rear:



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