What injectors are you running?

[Shane@DBPerformance]

Originally Posted by eclipse97gs-t

Everyone has a different opinion on injector size its driving me crazy. Some people say you will never max out 650s with a 50 trim and some people say get 880s or 1000cc for a 20g. fuel injector calculators tell you over 1000cc for 400hp with 4 injectors in a turbo application. Every time I think I’ve decided on what I’m going to get I hear something different. I am planning on a turbo upgrade but not for a few years so I’m not just trying to get the best injectors for the 20g. Any input would be awesome.

Fuel injector calculators always want you to use too high of a BSFC number on forced induction cars for modern turbo engines. The also say to run a max duty cylce of 80%. Everyone and their mother, including factory stock Hondas, will run injectors up to 95%+ without any problems at all. The amount of fuel needed for pump gas versus race gas is also huge. You might use 10-15% less fuel on race gas at the same power level versus pump gas on a turbo car.

As a general rule take the injector cc size and multiply it by .67, that will give you an idea of how much power they will support on a turbo DSM on race gas at the wheels on a Dynojet with a little room to grow still. Running higher than a 43.5psi base fuel pressure will also basically increase the size of your injectors, but lower the max potential of your fuel pump.