BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)


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      01-01-2013, 08:25 PM   #1
Second Lieutenant
MA128's Avatar

Drives: 2013 128 Coupe 6MT
Join Date: Mar 2009
Location: Boston Suburbs

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2013 128 Coupe  [0.00]
128 Sport - Suspension Upgrade (Street)

I'm re-posting this because my impressions have changed a great deal in 3 months.

2009 128 Sport Package 58,000 miles (3 months ago)

The car had become really loose so I did the following:
  • M3 rear subframe bushings
  • M3 front sway bar
  • M3 front upper and lower control arms
  • Koni FSD shocks
  • 4-wheel alignment

Total cost (parts and indie shop labor) = $3,300

As I had expected, things tightened up quite a bit and the instability I had on the highway is much diminished. Nevertheless, the rear is still a little soft so the car rocks from side to side in tight turns and on bumpy roads. I also have some additional NVH from the M3 rear subframe bushings.

Initially, I felt that the end result was a car that feels over-sprung (over-bushinged really) and under-damped. The FSDs handle large bumps and aggressive turns well but the smaller stuff doesn't get damped as well as I would like.

Other posts dealing with progressive vs linear springs lead me to think that the rear springs allow too much initial motion and the FSDs (by design) have too much initial softness to counteract the springs' weakness. Perhaps new linear rear springs (2011+ E82 OEM) and rear guide rods (not M3)?

Now that I have ~5,000 miles on the new suspension, the harshness is completely gone. In the first few thousand miles after the installation, sharp road impacts would slam through the structure and actually rattle the dashboard. After this break-in period for the bushings, the car rides as comfortably as the day it was new but is better controlled.

Just need a little more work at the rear and I think I'll have this perfected, although I still wonder if I spent more money than necessary. Would I have achieved 80% of the improvement at 30% of the cost by just replacing the worn OEM shocks with Koni yellows? Oh well, live and learn!

Happy New Year to all.
NEW: 2013 128 Coupe / 6MT / Premium / M-Sport / Cold / Xenon / HK Audio / CDV Delete
OLD: 2009 128 Coupe / 6MT / Premium / Sport / Cold / Xenon / HK Audio / CDV Delete / M3 Suspension
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      01-01-2013, 09:04 PM   #2
Second Lieutenant
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Drives: 2008 128i
Join Date: Mar 2011
Location: South Jersey

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2008 BMW 128i  [5.00]
Glad your setup is working out for you. Nice to see updates like this.
Afe Scoops and CAI, PBX, BMS Paddleshift upgrade, 261M's Powder Coated Gunmetal, 225/255 Michelin PSS, (BMW Performance: BBK, Illuminated Door Sills, Shifter Knob and Boot, E-Brake Handle, Steering Wheel, Front Strut Bar), E93 FSB, E92 RSB, M3 Rear Subframe Bushings, M3 Front Control Arms, HPA coilover kit (Koni Adjustables and Swift Springs), Steel Brake Hoses, Black Kidneys, Smoked LED side markers, Blacklines, Msport lip spoiler...
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