Discussion and questions related to the course Practical Diesel Tuning
Hi can someone confirm please that in the attached photo that the negative numbers are before top dead centre thank you
It looks like the data in that map is represented in ATDC, not BTDC like you're expecting. The (-) data is more advanced and would be an injection event starting BTDC. The (+) value is one more retarded, starting ATDC.
What vehicle is the map from, out of curiosity?
Thanks for the reply. It’s a stock map from a 2012 Mazda bt50. So a larger negative number would be advancing the timing? Also these numbers are SOI numbers?
That's correct from what I can tell. -10* would indicate SOI 10* BTDC
I´d like to add a little bit of wisdom here. Don´t believe every number in those maps. They have to be taken with a grain of salt. Not uncommon for the drivers (definition files) to be wrong.