Quote:
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.
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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.