2 yellow dot stock spring rate

slomo · Postby **slomo** » Sun Apr 29, 2018 5:02 pm

I've searched everywhere for the spring rates for stock 2 yellow dot springs (rears).
I believe they from either late (96 or 97) NA8 or early NB8A.
regards..

93_Clubman · Postby **93_Clubman** » Sun Apr 29, 2018 11:14 pm

Off the top of my head, can't link two white dots or two yellow dots to specific models or years, but following might be of interest:

manga_blue wrote:Early NA6 164/97 lb/in with 19/12 mm sways
Later NA6 154/94 lb/in with 19/12 mm sways
Std NA8 154/94 lb/in with 19/11 mm sways
NA8 R package 154/94 lb/in with 20/11 mm sways, but that might have been the US version only
All NB 162/118 lb/in with 22/11 mm sways
NB Mazdaspeed 215/158 with 23/14 mm sways (presumably the same on the AU delivered SE?)

Just going on those figures alone the first model NA6s had the sportiest handling (lowest FRC of 58.9%) then they got progressively worse from there until you got a Toyota Corolla-like 66.9% with the stock NB.

PS divide lb/in by 55.88 to convert to Kg/mm

93_Clubman · Postby **93_Clubman** » Mon Apr 30, 2018 3:48 pm

Following seems to be commonly referred to on the big forum: http://www.puppetmaster-robotics.com/Mi ... prings.htm
But I note there are a few other posts on there with potentially relevant info:
https://forum.miata.net/vb/showthread.php?t=606489
https://forum.miata.net/vb/showthread.php?t=480971
https://forum.miata.net/vb/showthread.php?t=354382
https://www.google.com/search?q=mx5+spr ... 53&bih=572

slomo · Postby **slomo** » Mon Apr 30, 2018 5:10 pm

Thanks for your reply.
My research picked up all but your last reference. however that reference mentions 2 yellow dot as front springs from 2001.
Mine are definitely rears. I know the factory data becomes scarce after 1994.
Its not a big deal but knowing would save me replacements as they are in excellent condition.

manga_blue · Postby **manga_blue** » Mon Apr 30, 2018 5:25 pm

You know you can work this out yourself too? e.g. 2Kg/mm springs will deflect 1mm when you put a 2Kg load on it. What I've done in the past is clamp the bottom ring of the spring in a vice and hang weights on a cord passing down through the middle of the spring. Best results come if you pre-load and measure with about 10Kg then measure deflection with an extra 20Kg.