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Z3 N62 Swap P/S, Exhaust & Suspension

The power steering system uses a Z3 power steering pump with N62 pulley.

Exhaust is not completely finished but is a true dual all the way back, into E92 M3 resonators and X pipe and then dumping just past the mid pipe. Eventually I am going to rebuild this exhaust, it sits a little too low right now and drags over speed bumps and it's way, way too loud like this.

Suspension consists of mostly all stock Z3 non-M components. I have aluminum E30 M3 control arms and Koni yellows with H&R's and an M strut bar assembly because the M strut bar is contoured in a way to provide better clearance where I needed it.

The E30 M3 control arms are a pretty significant weight savings of over 50%, a 6 lbs saving per arm in unsprung weight.

The Koni cut-a-strut's are for M application, but I used non-M strut bearings to maintain correct suspension geometry.

The rear has upgraded E46 M3 upper shock mounts as well as solid aluminum subframe bushings and brand new rubber trailing arm bushings. I went with solid aluminum bushings to mimic the usage of solid bushings on newer M models and to minimize the likelihood of trunkfloor issues by minimizing the movement of the subframe. The trailing arm bushings were kept stock rubber to try to minimize NVH due to the solid bushings.

The rear diff was swapped to a 3.15 Torsen unit, it was originally a 4.27 ratio which was insane during the first few test drives. I did a mild rebuild on it, slapped an M diff cover on it and painted it silver.

Quite happy with the fitment with the Koni/H&R's. The springs are designed for the M engine and the total weight seems to be pretty close to the V8 swap because the ride height is about identical to my M's with this suspension.

Eventually I will get around to rebuilding these Fikse FM-10's. The rear has about 1" spacers and I plan on buying new barrels that are 1" deeper in the rear.


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