Drivetrain
Factory six-speed manual, kept behind the L92 with an MC Motorsport Stage 1 adapter — S1-LS-HGU-952 (Chevrolet LS to BMW M57N HGU / N54, 240 mm / 9.45″). LSE9X engine and transmission mounts for the swap.
Engine
L92 in the 135i bay — heat-wrapped intake, 3D-printed ducting, catch can plumbing.
The N54 had spun a rod bearing. It had index 12 injectors, a baffled oil pan, and a full refresh roughly a year before failure — factory turbos, rod bearings, gaskets, coil packs, spark plugs, and a new power steering cooler. Full records came with the car.
The L92 has a DOD & VVT delete, Summit 8711R3 cam, LS3 intake, and LSE9X long-tube headers. LS7 lifters and trays, BTR trunnion upgrade, BTR valve covers, ARP hardware throughout. Valve cover breathers run -12AN vent lines to a 3D-printed catch can. Continental flex-fuel sensor on the Haltech Rebel LS ECU, with an ESP32 CAN bus translator for BMW chassis integration.
Cooling and oiling
Remote oil cooler with a Bosch combined temp/oil-pressure sensor. The dual parallel oil coolers were replaced with a single E90 M3 oil cooler and 3D-printed ducting routed for the LS. Moroso 3 qt oil accumulator, Haltech-controlled — pre-oils and dumps back into the pan when oil pressure drops below 25 psi. Exhaust: 3″ to 2.5″ to single 3.5″ to Berk street muffler.
Interior
Mostly gutted, sunroof deleted. Factory dash retained. An ESP32-powered Pip-Boy warning light handles alerts. Antigravity lithium battery.
Suspension
MCS 2WNR two-way adjustable dampers (2022). 650 lb/in front and 900 lb/in rear Hypercoil springs. Front: 60 mm helper springs, Torrington bearings, Turner upper control arms and bushings, Vorshlag camber plates, M3 strut tower braces, upgraded sway bar links. Rear: Ground Control articulating spring perches, M3 subframe bushings, M3 camber link conversion, adjustable camber and toe arms, UUC anti-roll bar.
Wheels and safety
Clenched fender flares clearing up to 10.5” wheels. Square setup: 18×10 with 275 tires. Autopower bolt-in roll bar, omp halo seats.
Vented hood, splitter, and flares at work.
Several weekends in post-swap.
On track
2:02.9 at VIR (Virginia International Raceway).