RR Racing Supercharger Ethanol Kit and Stage 4 Tune

Please note that specific setup and pricing may differ from each customer.

Our Stage 4 (previously stage 3) upgrade was developed for our customers who want to run 10 second quarter mile times and beyond supercar levels of performance!

The Stage 4 power upgrade for the ISF Supercharger kit achieves 650whp to 714whp on e85 fuel (about 760hp to 860 at the crank @ e85 content of 70-80%). Internally stock ISF engines are recommended to run 50% e85 blend or higher for maximum safety/reliability.

Stage 4 upgrade kit includes in most cases the following (may differ depending on application):

• Innovate Motorsports e85 gauge kit.
• Radium Fuel surge tank with integrated fuel pressure regulator and TI Automotive "Hellcat" fuel pump
• Upgraded port fuel injectors
• All fittings required for fuel system installation.
• Teflon lined braided fuel hose.
• Upgraded Supercharger pulley and belt
• Revised ECU tune.






Please note that running on regular high-octane fuel will require switching the tune file. Running on regular high-octane fuel without 55% ethanol is not recommended at full throttle.