Injector Size
To get much more than 300 hp from the stock injectors, you have to go pretty lean, leaner than most folks like to run them for safety. The conversion is pretty simple. You just divide the injector size, in pounds/hr, by the brake specific fuel consumption, in pounds/horsepower-hour. The answer comes out in horsepower per injector. For an unblown engine, a good "first guess" is 0.5 for the BSFC. This would give 56 horsepower for each of the stock 28 pound injectors, or a total of 336. But most folks run their turbo engines rich, to prevent detonation, so the BSFC is more likely to be 0.6. That will give a little less than 50 horsepower per injector, or a total of about 300. It also matches up pretty well with the rating of the stock fuel pump. Of course, you can increase fuel pressure with a better pump, and get more flow per injector, but the above gives an idea of how the numbers work out. The cc rating on the imports matches up with the metric horsepower they produce. Then you have to figure out how to convert a metric horse to good old USA units. Easier just to buy American.
