10 step process questions

I have a few question about the 10 step process.

Where in the process do you have to do following things if your working with a link ecu:

- Calibrating charge temperature compensation

- Calibrating fuel charge cooling coefficient

And i have another question to about injector latency.

What if you have no clue about what the values must be, is there a way, you could achieve a acceptable value, because i've read some things about people who calibrate the injector latency in the beginning of their tune

Tuning the charge temperature estimate table is a complex and time consuming task regardless whether you're doing your tuning on the dyno or the road. It really needs to be an ongoing task through the tuning process and to make matters worse, when you change the charge temp estimate table it will affect your fuel/efficiency table values. I'd suggest watching the webinar we did on it a while back for a better understanding and a real worked approach: https://www.hpacademy.com/previous-webinars/075-charge-temperature-compensation-link-g4/

While I love the theory behind charge temperature estimation, the practical hurdles of actually getting this table working really well are not insignificant and when set up poorly you're going to have a worse result than if you just relied on IAT compensation alone so think long and hard about whether the time and effort is worth it for you.

The fuel charge cooling coefficient needs to be dealt with early on in the tuning process however you do need the car to a point where you can drive it under some moderate load before making adjustments. Again there is a webinar covering this that I'd recommend you check out: https://www.hpacademy.com/previous-webinars/how-to-tune-the-fuel-charge-cooling-coefficient-in-a-link-g4/

As for coming up with accurate injector dead time values for an unknown injector, unfortunately I can't offer much help here. Finding the dead time values is an involved task that requires some reasonably involved test equipment. If you don't have any data for a set of OE injectors, the most common option is to run with the default dead time table in the ECU and accept that it isn't going to be 100% correct. In all honesty while I like to have everything in a tune 100% perfect where I can, I feel that too much emphasis is placed on the importance of dead time.

Can't you find a dead time table by starting at tha max voltge you wil get, callibrte your afr en then let your voltage drain en watch the afr? Or is t his not a good way to fill in the table if you hve no values

This will correctly calibrate the difference between the different voltage break points in the table however the absolute values won't necessarily be correct.