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(Post Link) post #1 of 9 Old 28-05-12 Thread Starter
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How to calculate the right injection time?

Hello world...
I'm working on my jtd 8v...I mounted a GTB2056 and a bigger injector. I have both injector of jtd 115( 0445110 119) and mjet 120 (0445110 276)...

I would reach about 200-220 bph, I think that i need at least 100mg and 2bar boost....I am right?
For this I want to calculate the right injection time to reach this quantity of fuel injected.

Anyone have the right flow rate of injector?
Or....
How to calculate the injection timing set the quantity of fuel to be injected?

Thanks world!
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Look at the original file for the 115jtd..
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(Post Link) post #3 of 9 Old 28-05-12 Thread Starter
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In the original file of jtd the max injected quantity is 70mm^3....
I also use a proportion, for example:
At 1350 bar pressure, injection time to reach 70mm^3 is Y us (in the original file of 115),but I want 100mm^3, then

70:100 = Y : X...X = 100*Y/70...
But I think that is wrong...isn't?
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Why on earth do you want to do that??
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(Post Link) post #5 of 9 Old 28-05-12 Thread Starter
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i don't right understand....

because the first idea is linear relation between injection time and injected quantity at constant pressure...

help me!
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Read some SAE papers. There are plenty of them on this topic (injection timing).
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(Post Link) post #7 of 9 Old 28-05-12 Thread Starter
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Quote:
70:100 = Y : X...X = 100*Y/70...
But I think that is wrong...isn't?
Thatīs bad. Itīs not linear, but parabolic. It exists a fugure for that. Injection timing = opening time + spray time + closing time (last one is not important). If you want, I can send you injectiop duration rescaled to 105mm3. Just send me column for 10mm3 and for 70mm3.
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(Post Link) post #9 of 9 Old 02-06-12 Thread Starter
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what do you means about "spray time"?
for parabolic figure yu means:

IQ = a*Inj_time^2 + b*Inj_Time
where
a and b are coefficient that we can calculate from date in ecu, I am right?

my original inj time that are from 120 mjet as my injectors are:
Inj_time120mjet
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