Injector question

[chassis 33]

As a very broad brushed rule of thumb, do injectors want to closer to the throttle butterfly or the valve/cylinder in a petrol engine? Or does it depend on whether youre looking for power or torque out of the engine?

Regards
Iain

[GreenV8S]

Cars with dual injector setups seem to run the lower injectors for part load and switch in the upper injectors for full load. I guess the lower injectors give you less wall wetting and better distribution, and the upper injectors give you more evaporative cooling.