135i Convertible Spring Rates

[SalemChiro]

Does anyone know the stock 135i E88 spring rates? I've searched and searched with no luck.


I want Koni yellows with Swift Spec-R springs....No coilovers in my future.

After speaking with Swift, they said it should work....but it will sit slightly lower than the E82.

The E88 is only 300 lbs. more, and the weight distribution is very close so I wouldn't expect the rear to squat much. E82 bias= 52% front 48% rear. E88 bias= 50.3% front, 49.7% rear.

I might be the guinea pig to try this out. I figure if it doesn't work i'll just install the stock springs back in.

[Rob Daman]

do it because i'm curious too. i've read swift springs are really good.

[135iam]

I called eibach, H&R, and Swift on this and talked to either tech help or their R&D departments.

The best answer I received was from H&R. A 1.2" rear drop on a coupe is 1.4" on a convert using the following springs (pn. 29187)
The swift rear springs are firmer than H&R so I was expecting similar or less sag with swift compared to H&R.
But I ended up finding a deal on new KWv3's so I didn't order the swifts.

Interested in hearing how this goes for you

[SalemChiro]

With Swift on the coupe, some report a 1" drop front and rear. I've also read 1" front and .8" rear. If I get an extra .2" all around I'm fine with that.

I'm more concerned pairing the correct spring/shock combination for comfort/performance rather than the overall look of having the car lowered. That's my reasoning behind the Swift springs vs. leaving the stockers in.

[128Convertibleguy]

Originally Posted by SalemChiro

With Swift on the coupe, some report a 1" drop front and rear. I've also read 1" front and .8" rear. If I get an extra .2" all around I'm fine with that.

I'm more concerned pairing the correct spring/shock combination for comfort/performance rather than the overall look of having the car lowered. That's my reasoning behind the Swift springs vs. leaving the stockers in.

My answer for better comfort/performance with stock ride height will be stock springs and Koni FSDs, and a bigger front antiroll bar for roll control. Less performance than Swift/yellows, but stock ride height and better comfort. It's a good pairing, the FSDs were designed specifically for stock ride height.

Just a personal choice based on priorities, not a case of right/wrong. I'm not big on lowering.