06 MR stock spring rates

Reply Subscribe

Thread Tools

Search this Thread

Apr 27, 2009 | 02:19 PM

#31

randomevo

Evolving Member

iTrader: (17)

Joined: Apr 2007

Posts: 384

Likes: 0

From: New York,NY

bump for a useful thread.

mrfred, or anyone else, did you ever get to test the 8/9 non-MR?

Last edited by randomevo; Apr 27, 2009 at 07:46 PM.

Reply Like

Nov 13, 2014 | 01:34 PM

#32

xteekayx

Newbie

iTrader: (1)

Joined: Mar 2006

Posts: 22

Likes: 0

From: NJ

I apologize for resurrecting this thread but did anyone finally verified if the gsr evo ix spring are different from the MR?

Reply Like

Nov 26, 2014 | 08:37 AM

#33

artinist

Evolving Member

Joined: Oct 2003

Posts: 228

Likes: 0

From: So. Cali.

Quote:

Originally Posted by mrfred

Finally got a chance to measure the stock Evo IX MR spring rates. The springs were tested on an Instron 20,000 lb servohydraulic test frame with a calibrated load cell. The front springs were compressed a total of 6 inches. The rears were compressed 5 inches. The rates were very consistent over the entire range of travel. Both the front and rear springs are linear rate springs (with a tiny bit of non-linearity at initial take up). The rates are:

front: ~200-205 lbs/in
rear: ~265-275 lbs/in

Interesting to compare with Swift Sport Mach springs. They claim a progressive spring rate:

front: 179->269 lbs/in (10% softer than stock progressing to 30% stiffer)
rear: 157->314 lbs/in (40% softer than stock progressing to 16% stiffer)

Anyone want to send me some springs to measure?

so if i calculated correctly the stock rear spring is 32% stiffer than front and the Swift springs are 15% stiffer in the rear.

its probably a good ratio to keep in mind when experimenting with springs for coilovers.

Last edited by artinist; Nov 26, 2014 at 08:42 AM.