28-11-2014, 11:10 AM
Is it still knocking badly when on the move? I suspect the duration table will need a fair bit of work to get right. I have the same thing when you stick big nozzles on the TDi's.
Lots of work on duration and timing needed round idle and light load, as different nozzles tend to atomise differently. Specifically the big TDi nozzles atomise a lot worse, due to the large hole size. Then at light loads, on the move, less advance as they deliver more fuel and less duration, then full throttle less advance again, but weird things happen with the durations so you need to work out how that specific nozzles responds.
It all depends on the characteristics of that particular injector and nozzle really as to how it behaves, but all I can say is, use your eyes, ears and nose to tune it. Not what you read on paper.
Lots of work on duration and timing needed round idle and light load, as different nozzles tend to atomise differently. Specifically the big TDi nozzles atomise a lot worse, due to the large hole size. Then at light loads, on the move, less advance as they deliver more fuel and less duration, then full throttle less advance again, but weird things happen with the durations so you need to work out how that specific nozzles responds.
It all depends on the characteristics of that particular injector and nozzle really as to how it behaves, but all I can say is, use your eyes, ears and nose to tune it. Not what you read on paper.
JP