Quote:
Originally Posted by 4x4le
A good rule of thumb is get injectors that would be sized right for gas and run them on e85 with a 4 bar setup (4bar setups work better than 3 bar with e85 anyways as long as your pump setup is good for your demands). This also allows you to start out with your fuel map as you would if it were on gas and make minor global changes to get it right.
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I understand what you are saying here, but wouldnt this decrease the lifespan of the injector due to being under greater pintle pressure constantly. Also the fuel system is at a great load constantly. I personally prefer running the larger injectors, and adjusting the global fuel table by the ratio of old injector to new. For instance, you go to 1000's from 740's all you have to do is multiply your global table by .74 and you should be in the ballpark and then minor adjustments. There isn't increased stress on your fuel system, and you gave yourself the duty cycle/longevity that running stock pressure will maintain. Especially if you plan to run a fair amount of boost. Starting at 60 and then running 25lbs of boost will put you at 85psi fuel pressure. That is moving into a territory where a lot of pumps get very weak and could starve your system up top.