3 Series E90 — Stage 3 ECU Tune
- 968 horsepower output at 2.2 bar boost pressure
- High-flow air-to-air intercooler for improved cooling efficiency
- Optimized cam timing with Schrick performance camshafts
- Reliable forced induction via Garrett turbocharger
- Reinforced drivetrain with TH400 transmission for power delivery
This E90 build pairs an S54 with a Garrett GTX45 turbocharger, dry sump oiling, and Schrick non-VANOS camshafts—designed for closed-circuit competition use. The swap to a TH400 transmission handles the output while the Maxxecu standalone manages everything from ignition timing to boost control at 2.2 bar.
We calibrated fuel and ignition maps from scratch, targeting safe combustion temps and stable air-fuel ratios under peak load. The dry sump setup allows consistent oil pressure through high-G corners, and the non-VANOS cam profile shifts the power band higher where the big turbo thrives. Logged results from the workshop show 633.9 kW at the wheels.
Maxxecu's flexibility let us dial in progressive boost by gear and rpm, keeping traction manageable on the rear-wheel-drive platform while preserving response below 4000 rpm. The intercooler keeps inlet temps in check during extended sessions, critical for timing stability on high-octane fuel.
Why the TH400 transmission on an S54?
The TH400 is a proven three-speed auto capable of handling the torque and power from a large single turbo setup. It simplifies the driveline for competition use and eliminates the need for a clutch pack rated to this output.
What does non-VANOS mean for driveability?
Removing VANOS and fitting fixed-profile camshafts trades low-end flexibility for top-end flow and mechanical simplicity. It shifts peak torque higher in the rev range, which suits the turbo's efficiency window but makes the engine less docile at part throttle.
Can this calibration be adapted to different boost levels?
Yes. The Maxxecu file can be rescaled for lower boost if required, though ignition and fuel tables would need verification on the dyno to maintain safe margins.
Workshop & Dealer Access
Protunes supplies ECU calibration files exclusively to approved workshops, tuners, and dealers throughout Australia. Platform: Maxxecu.
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