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post #1 of 13 Old October 25th, 2007, 12:09 AM Thread Starter
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Injector Capabilities

I read a magazine today and it was saying how to choose the right injectors based on your application.
For reliable operation of injectors, the maximum duty cycle is 80 percent!
Whether you use it as an interesting fact or the deciding factor in choosing your injectors.
All you need to know is the BSFC (Brake Specific Fuel Consumption) and Lbs/HR
BSFC represents the amount of gas that is used per hour for each horsepower made (apparently its retarded hard to figure out)
We assume that the BSFC is .50 on N/A Engines and .80 on Power added applications
(We assume that because they have been the most consistent numbers seen in testing.)
So if we want to figure out the maximum horsepower that a given size injector will support,
Were going to use the following calculation:

Example. ?-LBs/HR x .80 (Duty Cycle in percent) x 8 (Number of Cylinders) / (Divide) .50 (BSFC)

Example. Lets say your 5.0 Liter has some pinner injectors
19LBs/HR x .80 x 8 / .50 = 243.2HP - This is the maximum FLYWHEEL PONIES your injectors will handle

I hope its useful or I have taught someone something new!! haha

Remember - Using this calculation doesn't mean your injectors will handle that much power
Pushing the maximum amount of power through your injectors will cause power loss and inefficient delivery
Remember to upgrade other fuel components along the way

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post #2 of 13 Old October 25th, 2007, 12:21 AM
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post #3 of 13 Old October 25th, 2007, 12:28 AM
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1 important note: power adder cars have a higher BSFC than the .50 shown. i forget exactly but i believe its .60 for super/turbo chargers and .7 for n2o

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post #4 of 13 Old October 25th, 2007, 12:47 AM
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Could you just add that in instead of the .50 instead then
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post #5 of 13 Old October 25th, 2007, 12:48 AM
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Quote:
Originally Posted by 8t6gt
Could you just add that in instead of the .50 instead then
exactly

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post #6 of 13 Old October 25th, 2007, 12:51 AM
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also, i just checked and it is .60 for turbo, .65 for SC, and .70 for n2o...and of course .50 for N/A. these #s can vary depending on how efficient your engine is but this will get you really close.

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post #7 of 13 Old October 25th, 2007, 01:12 AM
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I think its a good find nice job man
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post #8 of 13 Old October 25th, 2007, 05:05 AM
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post #9 of 13 Old October 25th, 2007, 10:02 AM
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Quote:
Originally Posted by TENGRAM
1 important note: power adder cars have a higher BSFC than the .50 shown. i forget exactly but i believe its .60 for super/turbo chargers and .7 for n2o
Did you read the whole thing? He made a reference to the difference.

For those of us that are too lazy to do the math, there are many online injector size estimators. Here are two of them
http://z31.com/software/injector.pl
http://www.rceng.com/technical.aspx

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post #10 of 13 Old October 25th, 2007, 02:21 PM
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0.7 for N2O???

For a wet kit you don't even consider the injectors.

For a dry kit, you up the fuel pressure significantly when activated so in theory you shouldn't need bigger injectors. Although I generally think dry kits suck, but they are easier to install.

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post #11 of 13 Old October 25th, 2007, 03:24 PM
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Quote:
Originally Posted by nolife
Quote:
Originally Posted by TENGRAM
1 important note: power adder cars have a higher BSFC than the .50 shown. i forget exactly but i believe its .60 for super/turbo chargers and .7 for n2o
Did you read the whole thing? He made a reference to the difference.

For those of us that are too lazy to do the math, there are many online injector size estimators. Here are two of them
http://z31.com/software/injector.pl
http://www.rceng.com/technical.aspx
honestly i didn't. i've seen the same type equation before so i just skipped past it. did i miss something?


BTW, that number represents efficiency. a well built/tuned engine can have a BSFC in the .45 range. the reason that power-adder cars have higher numbers is to provide an additional margin of error.

or, thats what i hear anyways.

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post #12 of 13 Old October 25th, 2007, 04:20 PM
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Quote:
Originally Posted by 8t6gt
Could you just add that in instead of the .50 instead then
genius!!! :award

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post #13 of 13 Old October 25th, 2007, 10:25 PM Thread Starter
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Quote:
1 important note: power adder cars have a higher BSFC than the .50 shown. i forget exactly but i believe its .60 for super/turbo chargers and .7 for n2o
Yeah sorry, I read the BSFC for Power added applications wrong.
The article tells you to use .60 for both SC and turbo applications
and says Nitrous requires no mathematical equation for estimation.

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