Stage 2 – Up to 275 HP | The Ultimate 900 ACE Turbo R Package

The Precision EFI Stage 2 is our most advanced performance package for the 900 ACE Turbo R, engineered for riders who demand exceptional power while maintaining OEM drivability and reliability.

Built around the factory Bosch MG1 ECU, Stage 2 features a complete turbo system upgrade, fuel system upgrade, larger injectors, and our exclusive Multi-Map technology, allowing you to switch between three power levels directly from your handlebars.

ECU Unlock and Reflash Service Included

Three Power Levels – Switch On the Fly

Choose the power level that best suits your riding conditions.

Map 1000 – 220 HP

• Runs on 91-octane pump fuel
• Ideal for everyday trail riding
• Excellent fuel economy during cruising

Map 2000 – 250 HP

• Runs on 91-octane pump fuel
• Outstanding trail performance
• Recommended everyday performance map

Map 3000 – 275 HP

• Maximum performance mode
• Add 10–12 oz (approximately one-third of a can) of Boostane Professional to a full tank of 91-octane fuel.
• Do not exceed 16 oz of Boostane per tank.

Watch the product video to see how quickly and easily you can switch between maps.

What's Included

• Precision EFI Stage 2 ECU Calibration
• Bosch MG1 ECU Unlock Service
• Turbo Upgrade (performed on your original turbocharger)
• Precision EFI Stainless Steel Downpipe
• Precision EFI High-Flow Fuel System Upgrade
• High-Flow Injectors with Plug-and-Play Harness
• Exhaust Manifold CNC Flange Surfacing for improved long-term durability
• Lifetime ECU Warranty

Stage 2 Benefits

• Up to 275 HP
• Three selectable power levels
• Sharper, faster and more precise throttle response
• Incredible mid-range and top-end acceleration
• Precision EFI Stainless Steel Downpipe for improved exhaust flow and reduced underhood temperatures
• Precision EFI Fuel System Upgrade designed to support higher power levels safely
• Turbo upgrade performed on your own turbocharger
• CNC-machined exhaust manifold flange to reduce stress on the runners and improve long-term manifold reliability
• OEM instrument cluster displays live and peak boost pressure (2022 and selected 2023 models)
• Retains factory Eco, Standard and Sport riding modes
• Maintains excellent cruising fuel economy while using Map 1000
• ECU Unlock Service included
• Lifetime ECU Warranty

Keep the Factory ECU—Keep Factory Reliability

The Bosch MG1 ECU used in the 900 ACE Turbo R is the most advanced engine management system ever installed in a Ski-Doo snowmobile.

Developed through nearly two years of engineering by BRP and Bosch, it incorporates sophisticated technologies that aftermarket standalone ECUs simply cannot replicate.

Rather than replacing this advanced controller, Precision EFI recalibrates your original ECU while preserving every critical factory protection strategy, including:

• Advanced Cold Start Technology
• Adaptive knock control
• Real-time ignition correction based on fuel quality and octane
• OEM engine protection strategies
• Factory diagnostics
• Outstanding cold-weather drivability

The result is a snowmobile capable of producing up to 275 HP while maintaining the reliability and refinement expected from a factory-calibrated machine.

Clutch Calibration

For a stock spring and helix combination in good condition, use the following starting point when running Map 2000 (250 HP):

• Target RPM: 8,100–8,200 RPM
• Precision EFI Adjustable Ramp Kit: SKI-900R-CLUTCH-RAMP-77G
• Starting Weight: 81.0 g total
• Apply Blue or Purple Loctite to the adjustment screws.
• A screw head sitting flush with the top of the hole (heel position) is the most common starting point.

Fine-Tuning

Perform a full-throttle acceleration while progressively applying throttle to minimize track spin. Once RPM stabilizes:

• If RPM is above 8,200, add weight.
• If RPM is below 8,100, remove weight.

Snow conditions, temperature, elevation, and traction will all affect clutch RPM and may require minor adjustments.

Map 3000 Clutch Operation

The clutch should always be calibrated using Map 2000 (250 HP) with a target engine speed of 8,100–8,200 RPM.

Once your clutch is properly set on Map 2000, simply switch to Map 3000, add the recommended amount of Boostane Professional, and the additional horsepower will naturally pull the engine into its ideal operating range of 8,300–8,400 RPM.

No further clutch adjustment is required when switching from Map 2000 to Map 3000. The increased engine output automatically raises the operating RPM into the optimal range for maximum performance.

Important Notes

• The factory muffler must be retained for Stage 2.
• Bosch MG1 ECU Unlock Service is included and backed by our Lifetime ECU Warranty.
• An adjustable clutch ramp kit is required to achieve the recommended operating RPM.
• For optimum turbo response and compressor protection, we strongly recommend the Precision EFI Blow-Off Valve.
• For maximum reliability under higher boost levels, we also strongly recommend the Precision EFI Air Box Clamps.

Precision EFI Stage 2 delivers the ultimate combination of power, versatility, and reliability—offering three selectable power levels, up to 275 HP, and the confidence of retaining the factory Bosch MG1 ECU and its advanced engine protection strategies.