setting PWM for correct injectors

[guttedmiata]

so what I see/read about setting PWM values doesn't match with what options tuner studios shows me I can change. I have two sets of injectors, one low imp and one high, and need to know how to set values for whichever I decide to use. The values currently show greyed out at 25.4 msec and 100%. So I should be good for the high imp injectors without changing anything? How do I change them for low imp? Also, there is discussion about turning off or disabling PWM mode but I don't see this option of turning it on/off.

Running ms2/pnp

[LT401Vette]

Firmware version?

[guttedmiata]

2.6.19

[Brian H EFI]

2.6.19 is the TunerStudio Version number not the firmware version, what your are looking for will be in your project properties dialog under the filed "Firmware".

If you open your project in TunerStudio and press Ctrl + p it will open your Project Properties dialog.

[guttedmiata]

Thanks Brian!

MS2Extra Serial321

[guttedmiata]

To be clear, we were running the low imp injectors already, but the settings seem to reflect to be correct for high impedance - which confuses me. The person that helps us tune is not available right now and we are trying to fire it up again after a rebuild.

[Matt Cramer]

If that's an MSPNP Gen 2, it has current sensing peak and hold drivers instead of PWM current limiting. The software settings are the same as high impedance injectors and the drive circuit handles the current control. It monitors injector current and waits for it to hit 4 amps per injector, then clamps the current at 1 amp until the injector shuts off. This is done by an analog circuit with no intervention from the CPU.