Tool to calculate Injector Const.

[yoecotec]

I do not know if it already exists but I have not seen. It may be useful for those with bigger injector and the fuel pressure increased.

Try it !!!

Injection Constant Calculator.xlsx

[Leafy]

whoa, that actually looks somewhat close to the injector constant for an 03-05 j-body. It is not what would work on the 02 j-body, unless. No I take that back, my injector constant is calculated with 44 psi base pressure. Ok this is nice, now I can figure out an ic without either knowing the size of the stock injectors or doing a lot of math.

[yoecotec]

May be userful for hybrid ecotec (LE61 etc) with stock Jbody PCM also.

Yes the value it's for Jbody Eco. My tool is more accurate than the approx. formula : (old/new) * old constant but you need to take your real fuel rail pressure.

I will do and other tuned with more accurate inj. const. this will help with unavailable Accel Enrich, Cold Start and transient Fuel in J's PCM.

[Rare5spd]

Thats pretty close. I punched in the stock injectors and it comes very close to whats in the stock tune. Not a bad method of getting close to what it should be. Here are my findings... Its been said to use the old injector/new injector*old constant to get the new injector constant. I feel this is being done inaccuratly because the stock injectors are not rated at 43.5psi. The stock injectors are rated at 24lbs but at 55.1psi. You need to convert the new injectors to the same rating in order to get a better accurate result. So 60lb/hr at 55.1psi is now 67.46lb/hr. So now 24/67.46*.178 = .06332642. Its not too far from what you came up with. I too had converted the stock injector constant (.17800) from liter per grams per sec to come up with 24.4lb/hr, which is a little off, and also converted the stock eco s/c constant .12644 (injector constant was obtained from Vince at trifecta who had unlocked the reflash) to 34.35lb/hr but this is also a little off as the s/c injectors are 33lb/hr. I still wounder how GM comes up with their numbers.


Stock Injecors and S/C Kit injectors ratings for the ecotec:

Specs were emailed to me straight from Delphi:

Stock
Injector Type - Long
FJ Catalog Number - FJ10573
OEM (ETCH) Part Number - 12571863
OEM Application - GMPT L850 2.2L 2003 MY
Max Flow (gms/sec) - 3.053
Supply Pressure (Kpa) - 380
Impedance - high
Max Flow (lbs/hr) - 24
Supply Pressure (PSI) - 55.1
Manufacturing Location - CPV
Spray type - Dual
Separation angle - 18.6
Cone Angle - 10.6

S/C
Injector Type - Long
OEM (ETCH) Part Number - 12593904
Delphi PN (if different from etch) - 25334059
OEM Application - HPSC L-850
SPO Ref - Delphi order P/N - 12593904
Max Flow (gms/sec) - 4.15
Supply Pressure (Kpa) - 350
Impedance - high
Max Flow (lbs/hr) - 33
Supply Pressure (PSI) - 50.8
Manufacturing Location - CPV
Spray type - Single
Separation angle - n/a
Cone Angle - 10

[cobaltssoverbooster]

yea i think this is already out but looks good

edit:wait im actually looking at something else this may be new

[PSYKOSTEVO]

whoa, that actually looks somewhat close to the injector constant for an 03-05 j-body. It is not what would work on the 02 j-body, unless. No I take that back, my injector constant is calculated with 44 psi base pressure. Ok this is nice, now I can figure out an ic without either knowing the size of the stock injectors or doing a lot of math.

Word to that. Less fuzzy math involved.