[Kgolf31]

Originally Posted by Cloud9blue

off topic, I believe the reason behind the use of soft 300 lb/in rear springs was due to the super soft rear subframe bushings on the non-M E9x and E8x. Stiffer springs weren't very effective with the entire subframe bouncing around.

Correct. Then the E9x M3 came out and now that's an easy upgrade.

I run #700 rear springs on M3 subframe bushings.

[chris82]

Originally Posted by Kgolf31

They also commented how those springs rates were way too high for any type of street use and recommended spring rates around 550 front, and 350 rear.

Also, to everyones surprise they weren't stanced either.




TCKline also recommended rates early when the car came out in 08 (which is when the One Lap was) of 450/300. He has now changed that thought in an article as of 2011:

http://www.bimmer-mag.com/issues/101...e#.VT-7wiFVhBd

Also, lastly. Bimmerworld's car has 2 way (perhaps 3 way) shocks which change handling dynamics of a car greatly

Hence why it depends. And they used a JRZ damper, not totally sure of the model, but I think it was the RS 2-way

[Kgolf31]

Originally Posted by chris82

Hence why it depends. And they used a JRZ damper, not totally sure of the model, but I think it was the RS 2-way

Right. But we all know the slammed people are running $3,000 shocks

[chris82]

Originally Posted by Kgolf31

Right. But we all know the slammed people are running $3,000 shocks

Well of course

[rjr1005]

Originally Posted by Cloud9blue

That's not "stance", . That's just aggressive fitment. I don't see anything wrong with that. I say it looks damn good as it is. If you want, I think wider tires (with less aggressive offset) might complete the look better.

Are you still on stock rear subframe bushings? That probably explain why rear feels "soft". 571 lb/in is decently stiff, if your shocks are doing its job. But again, I haven't heard anything good about H&R coilover kits...

Thanks

but I like how it sits I just wanna make it a hair wider in the rear and and so thats why I would want to reduce the travel as much as a I can so I am thinking about changing to the 686 or 747 lbs/in to help without putting too much stress on the shocks. Yes it is stock subframe bushings but I'm mostly concerned with the travel.

and to the other post, the front is progressive the rear is not

[marconi118]

to cure this you need stiffer and maybe longer bump stops that prevent bottoming up to the fender

[Kgolf31]

Originally Posted by rjr1005

Thanks

but I like how it sits I just wanna make it a hair wider in the rear and and so thats why I would want to reduce the travel as much as a I can so I am thinking about changing to the 686 or 747 lbs/in to help without putting too much stress on the shocks. Yes it is stock subframe bushings but I'm mostly concerned with the travel.

and to the other post, the front is progressive the rear is not

You realize that the stock bushings have about an inch of travel right?

You can take a crowbar and move the subframe, while bolted up, a considerable about.

All you're going to do with increasing spring rate is make the shock effectively dampen 2 masses (the subframe, and the car)

[rjr1005]

interesting lets continue this talk