12200411 Timing Advance Impass Reached

**Fast355** · 09-18-2013

Originally Posted by Caleditor

02 are the same

I remember something Ed Wright posted about timing limits on 4.3L.

I can tell you that the MBT table has nothing to do with it. I think the OS has another setting for HVS system

Never heard of HVS before. Its also definately a 5.7 calibration. The 4.3 can take more advance because the spacing is wider.

**Caleditor** · 09-18-2013

high voltage switch (HVS)

The type of ignition system

**Fast355** · 09-20-2013

Originally Posted by Caleditor

high voltage switch (HVS)

The type of ignition system

Oh that makes sense, just never heard it refered to as that is all.

**Fast355** · 10-07-2013

I noticed after emailing HP Tuners about this the other day that the constant had been added to the timing advance tab for maximum advance. It was set at 45° so I bumped it to 55° and now cruise at the 42° of timing I have commanded in low load areas. Running much better now.