E9X Swift Spec-R springs

[PureE92]

Originally Posted by mkeiser

this is good intel, exactly what I was looking for, thank you!

You're welcome & I am glad I could help. I did check out your profile and it seems you are very in tune with your car. Therefore just putting this out there that one more option that is available -> for maximum performance go with megan racing front springs (370lbs front) and adjustable perch rear + 9" swift 60mm spring 1100lbs.

This way it still retains the shocks/struts from the factory style ( Recommend Bilstein B8's) vs the cost of coilovers.

[mkeiser]

Originally Posted by PureE92

You're welcome & I am glad I could help. I did check out your profile and it seems you are very in tune with your car. Therefore just putting this out there that one more option that is available -> for maximum performance go with megan racing front springs (370lbs front) and adjustable perch rear + 9" swift 60mm spring 1100lbs.

This way it still retains the shocks/struts from the factory style ( Recommend Bilstein B8's) vs the cost of coilovers.

I appreciate the added info. Lots of options to weigh but I think I'm leaning towards just saving up for coilovers... I already have the m3 rear control arms and some misc. bits and bobs ready for that conversion. sorry for hijacking this thread but it has some really good info on springs!!!!

[jjFender]

Originally Posted by Brian_

According to Swift:

Front: (224 lb/in) (4.0 Kg/mm)
Rear: (616 lb/in) (11 Kg/mm)

Puts the front/rear wheel rates both at ~205 lb/in and feels pretty balanced.

Running off the shelf Koni yellows for now with trimmed OEM bumpstops.

Just so you know, this thread helped me buy the E9X swift spec R springs even though I already had a set of E8X version ready to install. I'm looking forward to installing the E9X version soon.

Anyway, just noticed you mentioned wheel rates in this post from a year ago. How did you calculate that? From the suspension motion ratios? Is there a source for that info? Thanks.

[Brian_]

Originally Posted by jjFender

Just so you know, this thread helped me buy the E9X swift spec R springs even though I already had a set of E8X version ready to install. I'm looking forward to installing the E9X version soon.

Anyway, just noticed you mentioned wheel rates in this post from a year ago. How did you calculate that? From the suspension motion ratios? Is there a source for that info? Thanks.

Yes, just used the very lazy method of multiplying the spring rate by the square of the motion ratios commonly passed around on the forum (.956 front & .576 rear).

Doesn’t take into account everything contributing to wheel rate (read fe1rx awesome ohlins thread for a much more qualified explanation), but decided it was plenty accurate for my purposes and the amount of effort I was willing to put in.

[jjFender]

Originally Posted by Brian_

Yes, just used the very lazy method of multiplying the spring rate by the square of the motion ratios commonly passed around on the forum (.956 front & .576 rear).

Doesn’t take into account everything contributing to wheel rate (read fe1rx awesome ohlins thread for a much more qualified explanation), but decided it was plenty accurate for my purposes and the amount of effort I was willing to put in.

Awesome, thanks!