DS4 timing advance specs

[Rockabillyrat]

Does anyone have a chart or info on the stock timing curve of a DS4 pump on a vin F engine? Im looking for the degrees of timing advance in relation to engine RPM.

 

[Rockabillyrat]

Never mind everyone I got a calibration sheet for a DS4. Here are the stock timing and flow numbers for a DS4831-5521s

 

[THEFERMANATOR]

I believe those are pump timing numbers, so double them for actual.

 

[Rockabillyrat]

Correct, those are cam ring degrees. X2 for crank degrees.

 

[EWC]

So what are we looking at here ? Almost 15 degrees of advance at 3400 RPM ? Different fuel outputs with the same RPM ?

 

[Rockabillyrat]

These are the calibrating specs for a DS4. Basically when its on the test bench the timing and fuel outputs needs to be within those spec at the RPM and pulse width thats stated in the calibration procedure.

I'm just doing research on timing curves for my DB2 pumps. Both the DB2 and DS4 are physically capabile of 11* of camring advace. But by design the DB2 limits timing, at stock calibration it only gets 3-4* of camring advance at 3200 rpm. So the DS4 has twice the timing on stock tuning. Im working on machining some parts to change the DB2 timing curve. I wanted to see what the DS4 specs were so I could have baseline on where to start. More timing = higher cylinder pressure so you have to be careful with that on this platform.