Quote:
Originally Posted by Hanzzzzz
This is what i got based on information from this thread, someone please correct me if i am wrong.
assuming it is a 4 cylinder at 4BAR fuel pressure:
For a turbo car at 12:1 fuel to air mix:
(injector size in CC's) x 0.783 = max whp the injector can support (roughly)
For a N/A car at 13.5:1 fuel to air mix:
(injector size in CC's) x 0.881 = max whp the injector can support (roughly)
Since duty cycles were not given, I dont know how they would factor in.
I am not a tuner, just a guy who passed grade 9 math.
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That's pretty good
In reality though, I don't think the relationship is linear... Since its volumetric flow. The formula probably has a couple polynomials, like to the second or third order or something... if your testing maximum flow there is probably only one variable still. If the duty cycle is taken into account you would be dealing with less than maximum flow, and another variable might be thrown in there... but this is just taking it from not much higher than a 9th grade math basis.
In other words, your rule of thumb calc is fine for rough numbers.
The reason max flow is calculated is because that gives you what your potential whp output is... if you want a rough calculation for whp just take what your duty cycle is and multiply it times the maximum whp numbers that are given (if the numbers given are at 100% duty cycle...
Are the number's shown on the first page maximum whp numbers for injectors at 100% duty cycle?
If yes... for a rough number... given the numbers provided are maximum potential whp numbers
370cc's at 4 bar = 290whp from first post (assumin MAF supports)...
92% duty cycle = 0.92 x 290whp = 266.8whp (roughly)
93% duty cycle = 0.93 x 290whp = 269.7whp (roughly)
and so on...
I'm probably wrong... but its all rough estimation, there are a few more factors, the best way to get true numbers is dyno test data, and injector flow test data.
