View Single Post
Old 05-22-2017, 05:29 PM   #2
95///M3
Junior Member
 
Join Date: Dec 2016
Location: York, PA
Posts: 16
iTrader: (0)
Default

Exhaust. We decided to switch out the the stock headers for a set of AA headers. This of course was AFTER the engine was already in the E36 chassis. Not smart. Somehow, the stock headers can be rather easily removed the cat-less AA headers can be installed in the E36 chassis with no real trickery. On top of it all the headers just BARELY clear the E36 frame and fit quite well even though they were not designed for this generation of 3 series. We dodged a bullet on this one. As an aside note, the N52 is a rather loud engine, especially with the aftermarket headers. Much louder than S52, S54 that we are more used to installing. The goals for the exhaust were to keep it 'whisper quiet' until full open throttle. We utilized all 304 SS dual 2.25" piping for the exhaust build. The secondary tubes were kept separate to keep torque up and run into stock secondary catalytic converters from the Z4. They then were merged into an X pipe just before the subframe. We then split the subframe and went into a pair of FlowMaster Super HP-2 mufflers (12412304). Finally we crossed the pipes back around to a custom dual 2.25" inlet to 2.5" outlet SpinTech muffler designed to fit our space and noise constraints. A single 3" stainless tip was used to exit though the factory MTech diffuser.









Wiring/Electrical: The N52 wiring was not overly difficult. An electronic throttle pedal and associated wiring needed to be added chassis side along with the E90 EKPS (fuel pump relay) wiring. A dual function E36 coolant temperature sensor was mounted in the stock location to feed the signal to both the ECU and cluster. A CAN-BUS controller was built to intercept the check engine light signal, oil level signal, and to control the AC compressor. The N52 does not use a traditional oil dipstick so we wanted a way to monitor oil levels. The CAN-BUS signal is intercepted and converted to a signal for the cluster. The stock 6 cylinder MPG gauge was replaced with a custom dial from E30Dad to display the oil level. The 6 cylinder cluster was also reprogrammed to the stock chassis mileage at the same time by Kassel Performance. Finally the stock MSV70 ECU was flashed to override EWS and all other associated E90/Z4 modules (BimmerLabs/Kassel).

Gauge by E30Dad:


Rough Pre-Lim Wiring Chart:


Power: We upped the stock power via a few performance modifications. The 3 stage intake manifold was used from a 330, Z4 3.0si, X3 si, etc. This is a bolt on modification. The stock headers were removed in favor of the AA headers as pictured above. We also used CobraMarty's machined Valvetronic shims. All of this coupled with dyno tuning resulted in a substantial HP gain. Car will be back on the dyno this Spring for final conclusive numbers.









Thanks to: Kassel Performance, BimmerBuddies, BimmerLabs, Rogue Engineering, Active Autowerke, Thayer Diffs, Renewed Finishes, UrbanWerks.






95///M3 is offline   Reply With Quote