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Old 05-04-2013, 06:47 AM   #1
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Default Coilover Spring Length

I have a 2003 LS and I'm about to pull the trigger on a set of Bilstein Sports. I've got Allstar sleeves, seats and house-brand springs picked out at Summit. I want to use 400lb front and 275lb rear. I would like to get the hub-to-fender lip measurement at 12.25-12.5" I believe I can get there with a 7" front and 8" rear spring. Does that sound correct?
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Old 05-04-2013, 11:13 AM   #2
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That's going to be close. Do those sleeves screw all the way down to the perch? My perches only get to within .5" and I needed to go with 6" in the front for 550lb and 7" in the rear for 350lb.
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Old 05-04-2013, 11:53 AM   #3
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Originally Posted by shooterschmidty View Post
That's going to be close. Do those sleeves screw all the way down to the perch? My perches only get to within .5" and I needed to go with 6" in the front for 550lb and 7" in the rear for 350lb.
Here is a picture of a Bilstein / Allstar combo from elsewhere on this forum.

https://www.miataturbo.net/miata-par...omplete-66803/

Thanks. What height are you at with those rates and lengths? Are the perches as lowest setting now?
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Old 05-04-2013, 01:41 PM   #4
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for 475/275

I'd probably go 7/8".
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Old 05-04-2013, 02:53 PM   #5
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for 475/275

I'd probably go 7/8".
Thank you.
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Old 05-20-2013, 05:13 PM   #6
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I just removed my obx springs and upgraded to 504/336. The obx were 370/275 and 6"/7" but they actually use much thinner wire than most of the cheaper springs so you get more travel before coil bind. I was at 12.5/12.75 with enough travel to put the tire in the fender liner and didn't get coil bind. I would definitely go 7"/8" to be safe though. My 504 lb front springs are 6" and look dangerously close to coil binding but they are stance springs on ebay because I cheaped out. It really depends on the spring.
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Old 05-23-2013, 02:25 PM   #7
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I had coil bind on 400lb 7" front springs running revalved bilsteins. You might want to try stiffer or slightly taller spring at that rate. I swapped to 500lb 7" and did not have binding issues.

In the rear I ran 250lb 7" and had hella coil bind. Don't run less than 8" if you want under 300lb rear rates. I have since tried 300lb 8" and 180lb 9" with no coil bind issues and I can still adjust the ride height in a reasonable range.
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