What's up Spool Street peeps, welcome to my build thread.
This project originally started off with the ideal of fully building the N55 in my 2011 335xi for no other reason than everything else has already been done over the last 5 years and I wanted to push the limits on the N55 platform. But..... I came up on a deal for an S55 long block with a blown head gasket that cost me less shipped to my door than what it would have cost to have the N55 close decked, so the project naturally had a shift in direction.
The Goal
Obviously, this is a new build, so power levels are speculative, but I'm looking to push between 800-1100 HP depending on tune.
The car will remain AWD (xDrive) and utilize a ZF8HP75Z 8 speed transmission controlled by a Turbolamik TCU.
The powerplant will be a fully built S55 engine running at 9.2:1 compression with a single GTR3582R snail.
The fuel setup is pretty wild since the car is running Direct Injection, Port Injection (6x1000cc), and Methanol Injection.
The List - New Mods
The List - Existing Mods
This post is still under construction, last updated 04/23/2025
This project originally started off with the ideal of fully building the N55 in my 2011 335xi for no other reason than everything else has already been done over the last 5 years and I wanted to push the limits on the N55 platform. But..... I came up on a deal for an S55 long block with a blown head gasket that cost me less shipped to my door than what it would have cost to have the N55 close decked, so the project naturally had a shift in direction.
The Goal
Obviously, this is a new build, so power levels are speculative, but I'm looking to push between 800-1100 HP depending on tune.
The car will remain AWD (xDrive) and utilize a ZF8HP75Z 8 speed transmission controlled by a Turbolamik TCU.
The powerplant will be a fully built S55 engine running at 9.2:1 compression with a single GTR3582R snail.
The fuel setup is pretty wild since the car is running Direct Injection, Port Injection (6x1000cc), and Methanol Injection.
The List - New Mods
| Item | Est Cost | Purchased |
| S55 | $2000 |  |
| ZF8HP75Z | $3000 | |
| Turbolamik TCU | $1800 | |
| CP Carillo Rods w/HD Wrist Pins | | |
| CP Carillo Pistons Ceramic Dome/Teflon Skirts | | |
| Precision Raceworks Stg3 Fuel Pump | | |
| Precision Raceworks -6AN Fuel line Upgrade | | |
| PPE Aluminum Transmission Pan +2qrts | $350 | |
| Mishimoto Upgraded Oil Cooler Kit | $450 | |
| Domiworks S55 to 8HP Adapter Plate | $500 | |
| N55 Torque Converter | $250 | |
| ACL Race Main Bearings | | |
| ACL Race Rod Bearings | | |
| Mishimoto -6AN Transmission Thermostat -180deg | $180 | |
| Upgraded Oil Housing Thermostat | $200 | |
| ARP 11mm Head Studs | $850 | |
| Pinned Crank Hub | $1000 | |
| 1M Aux Radiator (Used for Transmission Cooler) | $300 |
The List - Existing Mods
| Item | Est Cost | Purchased |
| Motive Reflex+ | $700 | |
| BMP Intake Manifold | $500 | |
| MHD Backend Flash | $250 | |
| XHP Stage 3 Flash | $200 | |
| Mishimoto Alum Radiator | $600 | |
| Pro Meth Methanol Kit 7x Nozzles | $1000 | |
| Custom Meth Rail | $100 | Hand Built |
| ISC Suspension 32-way Adj Damper | $1200 | |
| Logic 7 Audio Upgrade | $200 | |
| M3 Strut Brace | $400 | |
| M3 Cowl | $350 | |
| VRSF 7.5 Race Intercooler | $600 | |
| Bomiz Valvtronic Exhaust | $2000 | |
| 335d Coolant Tank | $145 | |
| Mishimoto Oil Catch Can | $200 | |
| VRM 19x8.5 (19x255x35R) & 19x9 (19x30x275) Wheels | $1200 | |
| Continental Extreme Contact Tires | $1200 | |
| StopTech Drilled and Slotted Rotors | $800 | |
| ECS Tuning SS Brake Lines | $120 | |
| Hawk Performance Brake Pads | |
This post is still under construction, last updated 04/23/2025
Last edited:
