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Chris2002 · 06-09-2010, 08:17 AM

It is well known that the 135i suffers from excessive understeer. Taking advice from fellow members of this forum I carried out the following modifications:

1. Replaced front springs with BMW performance springs (rated at 190) $450 (including fitting cost). Kept rears at standard 350.
2. Increased front tyre size to 225/40/18 $300
3. Removed the retaining pin on the front strut mounting point for a little more negative camber. Free!
4. Fitted 10mm front spacers to increase front track by 20mm. $130

Results: Better turn in response and reduced understeer. Ride height remains the same (springs 5-10mm lower but taller tyres). Rides bumps and pot holes at least as well as before.

BMW-NC · 06-09-2010, 08:48 AM

l I do is to engage the DTC, allows slip on the rear wheels and understeer is fixed for my needs

SlicktopTTZ · 06-09-2010, 11:25 AM

Quote:

Originally Posted by BMW-NC

l I do is to engage the DTC, allows slip on the rear wheels and understeer is fixed for my needs

Go autocrossing and you will hate the factory setup.

Chris2002 · 07-16-2010, 02:19 AM

Update: Handling in the wet is now more balanced front to rear. Without the need to light up the rear tyres I can now get 4 wheel drift in the wet!

06-09-2010, 08:17 AM	#1
Chris2002 New Member 1 Rep 10 Posts Drives: M135i Join Date: May 2010 Location: UK iTrader: (0)	Turn in It is well known that the 135i suffers from excessive understeer. Taking advice from fellow members of this forum I carried out the following modifications: 1. Replaced front springs with BMW performance springs (rated at 190) $450 (including fitting cost). Kept rears at standard 350. 2. Increased front tyre size to 225/40/18 $300 3. Removed the retaining pin on the front strut mounting point for a little more negative camber. Free! 4. Fitted 10mm front spacers to increase front track by 20mm. $130 Results: Better turn in response and reduced understeer. Ride height remains the same (springs 5-10mm lower but taller tyres). Rides bumps and pot holes at least as well as before.
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06-09-2010, 08:48 AM	#2
BMW-NC Selling drugs to BMW addicts 17 Rep 468 Posts Drives: 135i e82 6MT N55 Join Date: Dec 2007 Location: Baumholder / Hanau iTrader: (1)	l I do is to engage the DTC, allows slip on the rear wheels and understeer is fixed for my needs __________________ --- Quality US Spec Used Cars for Military Members stationed in Europe. Specialized in BMWs and MINIs up to 10k miles.
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07-16-2010, 02:19 AM	#4
Chris2002 New Member 1 Rep 10 Posts Drives: M135i Join Date: May 2010 Location: UK iTrader: (0)	Update: Handling in the wet is now more balanced front to rear. Without the need to light up the rear tyres I can now get 4 wheel drift in the wet!
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