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Mopar SRT4 injectors flow rate
Posted: Tue Jun 20, 2006 9:06 am
by granfofo
Hey guys great forum! I need help with a part# of SRT4 inectors I have, that I don't know if they are 2003 or 2004. The part# 04891574AB and below is 4073W10015. I'm using this injectors in my project car which is a 1987 Mitsubishi Mirage 1.6L turbo with lots of engine mods. I made my own Port EFI and I'm using this injectors because they are high resistance and work well with Megasquirt. Right now I'm working on tuning the car but I found out that this injectors work at 58psi and not 43.5 that I'm using, beause it will hurt atomization. Now I have to raise the pressure to 58 and see what happens. The thing is that I don't know what year they are and what flow rate. When I bought them, they told me 440cc. Can you please help?
Thanks...
Posted: Wed Jun 21, 2006 7:19 pm
by Greg_04-srt4
They have a blue section on the bottom right?
That number matches my stock injectors.
Here is how it works. Those injectors are Stage 1 injectors (but they came stock on the 2004 and 2005 SRT 4's).
Here is some info on flow rates
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Here ya go, from a PVO source:
I called RC and it sounds like they use 760 -770 kg/m^3 as the density of their test fluid. We use n-heptane which has a density of 685 kg/m^3. An injector's mass flow is dependent on the density of the fuel. If two different fuels are flowed through the same injector, the volumetric flow rate of each fuel should be the same. This said, both sets of numbers for the injectors that you have are wrong. The correct numbers are as follows:
For n-Heptane @ 58 psi,
2003 Injectors - 359.4 g/min = 47.4 lb/hr = 524.7 cc/min
2004 Injectors - 395.3 g/min = 52.2 lb/hr = 577.1 cc/min
RC Engineering and most aftermarket injector companies flow their injectors at 43 psi. Using Bernoulli's equation, the mass flow can be corrected to:
For n-Heptane @ 43 psi,
2003 Injectors - 309.5 g/min = 40.8 lb/hr = 451.8 cc/min
2004 Injectors - 340.4 g/min = 44.9 lb/hr = 496.9 cc/min
If RC Engineering flowed our injectors with their test fluid @ 43 psi, they would rate the injectors as follows:
2003 Injectors - 343.3 g/min = 45.3 lb/hr = 498.3 cc/min
2004 Injectors - 377.6 g/min = 49.8 lb/hr = 547.8 cc/min
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