2011 Procharged Camaro LS3 ID850cc

[Midnite Magic]

I am tuning a 2011 Chevrolet Camaro SS with the LS3. The engine has a custom camshaft, Procharger P1SC-1, ID850cc injectors and a ZL1 fuel pump module. I was wondering what the minimum pulsewidth is on these Injector Dynamics 850cc fuel injectors. I am around ~1 ms right now at idle and my fuel pressure is set to the OEM static 58.0 psi for all the different conditions. I see a factory CTS-V & ZL1 have their tunes set to adjust fuel pressure from 50.8 psi to 65.3 psi. Would I be better off doing this to bring the idle pulsewidths up a bit?? I assume low flow is idle conditions?

[MikeOD]

ID gives you everything you need right on their website.

[MikeOD]

But if you haven't found it, they list the minimum pulsewidth for that injector at 0.125 ms. Should be no need to drop the fuel pressure, and I don't think your car can anyways.

[Midnite Magic]

But if you haven't found it, they list the minimum pulsewidth for that injector at 0.125 ms. Should be no need to drop the fuel pressure, and I don't think your car can anyways.

I know they list that for their data but I think it would be impossible to have a physical min. pulsewidth that low

[DSteck]

That value refers to the theoretical minimum pulse width on Gen IV stuff. It doesn't take into account short pulse adder and voltage offset.

[MikeOD]

I know they list that for their data but I think it would be impossible to have a physical min. pulsewidth that low

With their data, if your PCM asks for as little fuel as equivalent to 0.125ms, the short pulse adder table will add 0.159 to it (as the injector isn't linear below 3.0 ms, again according to their data), and the offset table is going to add anywhere from 0.743 to 1.24 to it...given the camshaft in the engine and ~14 volts, the pressure delta is going to cause the offset to add something like 1.0-1.1 to the pulsewidth...so you're going to be right around 1.3-1.4ms from the PCM...but you won't see that in the scanner, as in the scanner with a gen 4, I believe you'll see the theoretical pulsewidth, not actual...which may be why you think the numbers are so low.

[MikeOD]

...either way, if you've got the ID data in the tune, and you're not rich at idle when it's warmed up, you're fine.