Switch on the Fly Tune Only for EFI Hardware Duramax LLY (2004.5-2005)

Flash using your EFI Live Flash Scan or AutoCal device

You will need an EFI License that you can buy from us

5 Switch on the Fly Tunes 

• Instantly switch tunes while driving
• Choose your switch option based on model year
• Motorops tunes produce less smoke
• More consistent power delivery
• Easy installation instructions
• Telephone support if needed

Switch Between:

HEAVY TOW

• For towing from 8,000lbs up to Gross Vehicle Weight Rating
• Wider torque curve assists heavy loads
• + 40 RWHP, + 80 ft-lbs torque
• Exhaust temperatures drop up to 100F under full load

LIGHT TOW

• For those towing below 8,000lbs
• Perfect balance of sport driving & functionality
• Designed for weekend tower, boats, small tractors, etc
• Unhook and enjoy a sportier drive
• + 60HP, + 120 ft-lbs torque  

SPORT ECONOMY

• Fun “unloaded” daily driving
• For driving around town, highways
• Impress your friends
• Put a smile on your face
• + 80 RWHP, +260 ft-lbs torque
• Puts your vehicle near the 380 RWHP mark

RACE

• Maxes out the factory fuel system
• +100 RWHP, +200 ft-lbs torque
• Recommend transmission tune to avoid premature wear
• If you drive responsibly, can use Performance as you would Sport Economy
• Also recommend FASS or Air Dog lift pump to maintain 400 RWHP

OPTIMIZED STOCK:

• + 10 HP, + 30 ft-lbs torque
• Leaves factory rev limit in place

Required Option

• Switch for LLY

Recommended Option

Transmission Tuning

• Increased transmission line pressure for holding more HP and torque
• Revised shift schedule to improve drive-ability
• Keeps the truck on top of the turbo
• Improved shift timing
• Re-designed torque converter lock-up strategy
• Allows power transfer from the engine to the wheels more directly