Pro tuners leaving pilot timing stock??

[NRunkle]

Had a truck come to me that was popping real bad in high load/full throttle situations. I pulled the tune. Turned down pilot timing, and turn off pilot injection in those areas. The popping went away. Why would the pros leave these values stock? What are the advantage/disadvantages to leaving this stock?

[Jim P]

All depends on the truck and the tuning and endless factors. Reducing pilot timing can be a pretty moot point depending on where it lands with main timing. Put it too close to main and main will just push it up. It?s the same with people trying to turn post event off and setting post timing to zero, reality it doesn?t work that way with turning off post event and is really a waste of time. Turning off post is literally just setting commanded fuel tables to zero, timing is irrelevant.

[NRunkle]

All depends on the truck and the tuning and endless factors. Reducing pilot timing can be a pretty moot point depending on where it lands with main timing. Put it too close to main and main will just push it up. It?s the same with people trying to turn post event off and setting post timing to zero, reality it doesn?t work that way with turning off post event and is really a waste of time. Turning off post is literally just setting commanded fuel tables to zero, timing is irrelevant.

This truck is has 150% overs inejctors, main timing was around 15deg at 2800rpm and pilot was at 50deg with stock injection quantity