Archives: air/fuel ratio

Optimum Air/fuel ratio

Is there an optimal air/fuel ratio for drag racing engines? While air/fuel ratio is important for fuel system management, there is no one optimum air/fuel ratio.  These depend on engine type, fuel type, and engine modifications.  Below are examples of some optimum air/fuel ratios for specific drag racing engine examples: engine induction fuel air/fuel ratio […]

Idle & Low End Air/Fuel Ratio Tuning Tool, Flared/Radiused Jet Orientation

We are now developing techniques using our jetting calculator to set up idle air to fuel ratio for really good MFI racing engine tuning.  Idle settings in many MFI racing engines are key to superior performance from engine temperature and off idle response. That is done by adjusting the combination of idle vacuum (throttle blade […]

Fuel Injection Setup & Tuning

… by Experience & Gut Feel Throughout the racing community, experience and gut feel are the most common methods for the selection of nozzle and jet size numbers for setup and tuning of mechanical fuel injection. It is a form of iteration or ‘connecting the dots’. Given enough time and expense, experience from good and […]