For those deep into the world of BMW E30s and performance modifications, the pursuit of more power is a well-trodden path. Within the vibrant community of Bimmerforums, discussions around turbocharging these iconic cars are common, especially when integrating modern engine management systems like OBD2. This is the story of Murray, an Aussie Bimmer enthusiast who embarked on a journey to turbocharge his E30, documenting his progress and sharing his experiences within the Bimmerforums community. His build is a testament to DIY spirit, showcasing a meticulously crafted E30 turbo setup while navigating the intricacies of OBD2 integration.
Murray’s project, conceived over a year and a half, was driven by a desire to personally handle every aspect of the build, save for the turbo manifold fabrication. Facing initial setbacks with an aluminum block engine, he pivoted to a more robust iron block M50B25TU, a common choice for turbo builds due to its strength. This engine became the foundation for a “bastard build,” blending components from different BMW models to achieve optimal performance and reliability. Recognizing the advantages of modern engine management, Murray chose to retain the OBD2 system, investing time in understanding and tuning the Siemens MS41.2 DME. This decision reflects a growing trend within the E30 community to leverage OBD2 for its diagnostic capabilities and tuning flexibility, often discussed in detail on platforms like Bimmerforums.
Engine Build: Marrying M50 and M54 for Turbo Power
Murray’s engine build is a masterclass in resourceful engineering. Starting with the M50B25TU iron block, known for its durability under boost, he incorporated an M54B30 intake camshaft to enhance top-end power – a modification often explored and debated within Bimmerforums turbo E30 threads. This cam swap required machining the VANOS gear for proper fitment, showcasing Murray’s commitment to detail. The cylinder head received a comprehensive refresh, including a cutring gasket and Raceware head studs to reliably handle the increased cylinder pressures from turbocharging. Attention to detail extended to the cooling system, crucial for a turbo application, with upgrades like an aluminum radiator and an 80-degree thermostat.
Engine Components at a Glance:
- Engine Management/Electronics: Self-tuned Siemens MS41.2, OBD2 integration
- Block: M50B25TU iron block, E34 oil pan, ARP main studs
- Head: M50B25TU head, M54B30 intake cam, Cutring gasket, Raceware head studs
- Cooling: Upgraded aluminum radiator, 80-degree thermostat, e46 diesel clutch fan
- Intake: M50 manifold, M52 throttle body, Nissan 350z MAF, Front Mount Intercooler (FMIC)
- Exhaust: Good n Tight 24v E30 T3 turbo manifold, Precision 6262 turbo, Tial MVR 44mm wastegate
- Fueling: E39 M52 fuel rail, Siemens DEKA 80lb injectors
OBD2 Integration and MS41.2 Tuning for Turbo E30
A key aspect of Murray’s build is the seamless integration of the OBD2 engine management system. He expertly wired an E36 328i harness into his E30, enabling the use of the Siemens MS41.2 DME. This is a significant undertaking, often discussed in detail on Bimmerforums, as it allows for modern engine control and diagnostic capabilities in the classic E30 chassis. Murray’s self-tuning of the MS41.2, including implementing boost control and AFR safety measures, demonstrates a deep understanding of engine management and a willingness to push the boundaries of DIY tuning. His success in reading boost and AFR for logging through the stock ECU further highlights the potential of OBD2 in modified E30 applications.
Driveline and Chassis Enhancements
To handle the substantial power increase from the turbocharger, Murray addressed the E30’s driveline and chassis. A GS6-37DZ 6-speed gearbox from an E46 320d was chosen for its strength and closer gear ratios, a popular swap among E30 enthusiasts seeking improved performance. This was paired with a Clutchmasters FX250 clutch and steel single mass flywheel. Suspension and steering were also upgraded, including an E46 330i steering rack for quicker steering response and lowered springs for improved handling.
Driveline and Chassis Upgrades:
- Driveline: GS6-37DZ 6-speed gearbox, Clutchmasters FX250 clutch, single mass flywheel, 3.15 differential
- Steering and Suspension: E46 330i steering rack, lowered springs, upgraded control arms and tie rods
Conclusion: A Bimmerforums Inspired DIY Turbo E30 Success
Murray’s E30 turbo build is a shining example of what can be achieved with dedication, skill, and the wealth of knowledge shared within communities like Bimmerforums. His meticulous approach to every aspect of the build, from engine assembly to OBD2 tuning and chassis upgrades, has resulted in a well-rounded and potent machine. The project underscores the enduring appeal of the E30 platform and the continuous innovation within the BMW enthusiast community, particularly when it comes to turbocharging and modernizing these classic cars. As Murray moves into the final tuning phase, his journey serves as inspiration for anyone contemplating a similar E30 turbo project, especially those looking to leverage the benefits of OBD2 engine management.
