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Fuel System
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The equation to estimate fuel consumption by horsepower output is as follows:
HP x BSFC(0.65) = fuel use in lb/min x 0.0107 = liters per minute x 60 = lph
Or, you can skip all the middle stuff and multiply HP x 0.42 to get lph. Example:
250hp x 0.42 = 105 lph
Conventional wisdom is that the pump should be adequate to supply the rate required for maximum horsepower output plus 20%. Here is a table of calculated rates:
HP…..lph…..lph + 20%
250….105….126
300….126….151
350….147….176
400….168….202
450….189….227
500….210….252
Source: Wret @ Dsmtuners.com
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**********Based on a 4 cylinder engine.any more or less will be different*********
HP Goal – Min Injector Size (cc/min)*
250hp-....... 550cc
300hp-....... 650cc
350hp-....... 750cc
400hp-....... 850cc
450hp-....... 950cc
500hp-....... 1050cc
Heres a calculator to help you figure out injector size's.
http://z31.com/software/injector.pl
http://www.rceng.com/technical.aspx <--- has lots of info on selecting injector sizes