Quattrozone Motorsports Singapore/Malaysia - Sepang Track Record 2.15.113

The B58 Gen 2 is a great platform to build and tune. It is stable, reliable, sounds great, and has a nice powerband. Similar to other modern BMW powerplants, the rods are the limitation and even aggressive stock turbo calibrations can push them to their limit. As long as we keep that factor in mind, we can take these from mild to wild or anywhere in between.

Stock fuel system + stock turbo + bolt ons can max out the turbo and run an ethanol blend with big power increases over stock. 450whp pump fuel 500+whp on Ethanol blend (E30). The stock intercooler is very poor on these cars from the factory so an upgraded Wagner charge cooler is perfect for even a stock or mildly tuned car.
Adding a P800 turbo is the next step, along with the Wagner charge cooler; at this point the limitation is the stock fuel system 500+whp pump fuel
The next step is adding upgraded fueling via either direct injection upgrades or port injection which will allow full ethanol fuel and another bump in power 500whp pump fuel, 600-700whp E85; Direct injection upgrades are more limited in output capacity compared with Port Injection. Only use the best injectors - Injector Dynamics for any port injector considerations.
Following the turbo and port injection upgrade in step 3, the next step would be a conventional turbo with pneumatic wastegate which will max out the engine’s capacity for power. Our in house favorite would be a 6466 if you like Precision turbo and a G35-1050 if you like Garrett. They both work well. 600-750whp on E85, depending on dyno and your risk tolerance. The new 6870 from Turbosmart also looks like a viable new option and watch for the new turbokits from CES Motorsport!
For more power than step 4; you should consider building the motor. A very simple build with pistons/rods and valve springs will get you into the 4 digits if you have enough turbo. Higher flowing headwork can open up significant gains but be weary of valvetronic and upsized cam issues; trust the best engine builders for this. 1000+whp

A91 Supra
Stock Turbo
Infinity Auto Intakes
Do88 Intake Manifold
Custom catless exhaust
Reflex+ w 1050cc Injectors
Full FlexFuel Up to E85
The high RPM power drop off is due to the stock turbo running out of airflow; this is optimized for track work with moderate spool torque and thermally sustainable power delivery for multiple laps.

Hybrid Turbo Upgrades

Our preferred move for these is the Pure 800 turbo with an oem exhaust housing (Avoid the new housing as it has very poor boost control). The P800 have been reliable, powerful, and quick spooling. The P850 and P900 spool later and in some situations are more mismatched. Beyond this, we recommend moving to a PTE 6466 or similar sized Garrett/Turbosmart Turbo of your choice.