ID 2000 Injector tuning

[AGRO]

Hi all,
im trying to tune an LS1 pcm with some ID2000cc injectors. Injector dynamics supply the battery offset table, small pulse adjust, minimum pulse width, default pulse width and flow rate.
I flashed the pcm with the supplied figures, unfortunately it runs pig rich, about 10.6:1 on idle. I have tried the obvious and leaned out the ve table to no effect. INJBPW reads 1.755, and stays locked on idle and light partial throttle.

To combat this i set the entire small pulse adjust to -0.400, this dropped the pulse width to about 1.329, and made a massive difference to the afr, the down side is that the ve table looks fairly wild! Im seeing 1.08g/s at wide open throttle (105kpa) before boost, i have run out of resolution in the timing table.

What is the proper way to correct this? Is there one?
fwiw, fuel pressure is at about 40psi on idle vacuum line disconnected, and about 35psi vacuum connected. Twin turbo 402ci heads cam.

Any suggestions appreciated.

Girch.

[joecar]

Your rail pressure is 40 psi with reference hose disconncted...

ID injector flowrate is for 58 psi.

You have to scale/multiply the ID flowrate by sqrt(40/58).

Is your IFR table flat horizontal (same value in all cells)...? [ this is how it should be for manifold referenced FPR ]

[joecar]

Also, you have to convert 2000 cc/s to g/s using the density of the fuel you're running.

Also, you have to set B3601 to the stoichiometric AFR of the fuel you're running.

[joecar]

If VE table looks wild (no pattern) this is an indication that the IFR slopes the wrong way.

[joecar]

I'm not sure that a negative SPA (i.e. -0.400 ms) will work, but I may be wrong.

[joecar]

When you hit the spark table's column range/boundary, the last value in that column will be used outside the range...

this should be ok, the spark timing used for 1.08 g/cyl should still be good beyond 1.08 g/cyl.

[AGRO]

Your rail pressure is 40 psi with reference hose disconncted...

ID injector flowrate is for 58 psi.

You have to scale/multiply the ID flowrate by sqrt(40/58).

Is your IFR table flat horizontal (same value in all cells)...? [ this is how it should be for manifold referenced FPR ]

Thanks for that Joecar.
I tried both, scaling IFR using 40psi and 58, i saw no effect, except when under boost. The IFR is a flat number. Im using pump fuel.
Commanding -.4 made a massive difference, went from 1.755 ms to 1.3XX.
Im going to treat the IFR as though i dont have a vac referenced reg and see how that goes, i dont have much confidence though!

[joecar]

Oh, the ID flowrate may be for 43.5 psi, so the scaling multiplier is sqrt(40/43.5).

[joecar]

If you disconnect the reference hose and leave it off, then the IFR table will slope...


IFR
= rated_flowrate * sqrt((rail_pressure + BARO - MAP) / rated_pressure)
= rated_flowrate * sqrt((rail_pressure - MANVAC) / rated_pressure)


[ be careful, units have to be consistent... use speadsheet ]

[AGRO]

OK,
i got it pretty good, i still had to command -.4 in SPA, the flow rate is quite different to what was reccomended. Now i have some resolution.................
Thanks for the input.

[5.7ute]

Do a search on B9021 "minimum transient pulsewidth" If you cannot find the necessary .cax let us know what OS you are using so we can get it to you.