Forum » Practical Diesel Tuning » Injection Timing

Injection Timing

Practical Diesel Tuning

Discussion and questions related to the course Practical Diesel Tuning


Page 1
Author
109 Views

Hi can someone confirm please that in the attached photo that the negative numbers are before top dead centre thank you

Attached Files
  • DAF2BA61-A9ED-4B47-8AED-E6231AB0D6D8.jpeg
  • Attachments may only be downloaded by paid Gold members. Read more about becoming a Gold member here.

Adam,

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?

Nick

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

Nick

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.