Thread: M3 on 328i
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      11-11-2011, 05:32 PM   #30
luckyu's Avatar
Drives: 2007 328i, 1998 328i
Join Date: Jan 2007
Location: San Francisco Bay Area, California

Posts: 423
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The Hyperco springs arrived today. The first ones I received turned out to be old stock, and Hyperco offered to exchange them for the latest designs.

I weighed all the springs, and Hyperco has apparently been making continual improvements. These are all 10" 2.5" ID 525#.

#1 2.42 kg (9 coils)
#2 2.15 kg (8 coils)
#3 2.11 kg (7.5 coils)
#4 2.08 kg (7.5 coils)

For reference, the Swift 10" 65 mm 504# weighs 1.92 kg. That's as rated, I haven't weighed it, but Swift's ratings have been right on.

The 560# 9" 60 mm Swifts I bought earlier -- I was going to use them until I re-measured and found I couldn't get the height I wanted with them -- weigh only 1.57 kg.

What matters much more than weight, is stroke. The Hypercoils I have now look like they have 5.75" of stroke before coil bind, maybe more. It's pretty cool to see these spring designs improving. The 504# Swift spring is rated to have a max stroke of 6.1".

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2007 328i ZSP. M3 suspension: custom valved Bilstein shocks, Hyperco race springs, M3 lower control arms front and rear, M3 sway bars, and M3 subframe bushings. E46 front guide supports. Euro tail lights.
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