If your transmission has synchros, use the clutch pedal!!!
If your transmission has faceplates/dogs, ask yourself if the rpm drop be occurring BEFORE or AFTER the shift? Do you need a power cut to get the transmission out of gear?
For drag racers with dogs instead of synchros, ideally you want the rpm drop AFTER the shift with no power cut. The engine is getting pulled down against WOT by the clutch after the ratio change, and the resulting inertia discharge is getting sent to transmission's input shaft. The ability to control the rate of inertia energy discharge is key to taking advantage of the inertia discharge. If the resulting rpm drop happens too fast, the added energy can spike the tires.
Bottom line is- if you have to reduce/cut power to achieve your WOT "clutchless" shift, you are fooling yourself. Not sure why the typical drag racer would want to cut power anywhere before crossing the finish line.
Chapter 01- The Basics of Inertia Management
Chapter 02- Calculating Inertia's Effect on Input Shaft Torque
Chapter 03- Clutch Slip After the Shifts... Good or Bad?
Chapter 04- Heavier Cars LESS Likely To Break Transmissions?
Chapter 05- Understanding The ClutchTamer
Chapter 06- Understanding The Hitmaster
Chapter 07- The Basics of Analyzing Dragstrip Data
Chapter 08- Flywheel Weight- Heavy or Light?
Chapter 09- Choosing a Proper Clutch & Pressure Plate
Chapter 10- The Importance of a Clutch Pedal Stop
Chapter 11- What's the Best Launch RPM?
Chapter 12- Do You Need a 2-Step Rev Limiter?
Chapter 13- Traction Problems- Adjust Shocks, Chassis, or Clutch?
Chapter 14- Are "Clutchless" Shifts Right For You?
Chapter 15- Traction Control- Yes or No?
Chapter 16- Apply ClutchTamer Tech to an Adjustable Clutch?
CHANGING THE GAME ON LAUNCHING YOUR STICK SHIFT CAR!!!