What tuning strategy apply on OEM car

Hello, as you told in the video you will not explain how to tune the car because this course is only on how to use winols software, but a lot of us in the chiptuning market struggle to find a good way on how to make increments. A lot of people use the %age to make gain in the performance expecially on diesels, but it would be really good if you make a video on how to make the "stage" on the car. For example, how can i know how many degrees of timing give with safety? or, how should i make the torque limiters or injection or turbo pressure etc.

Thank you

I think the obvious answer is look at the diesel tuning course that's available, but I'll try to provide some insight anyway.

Personally I start with using % changes, sometimes quite big changes to entire maps just to see if it makes a difference at all, but this is done while on a dyno, measuring lambda and logging boost in some manner. Even with large changes, you're unlikely to hurt anything if you start slowly. For example, I'll make huge changes across several maps, get the car rolling on the dyno at say 60km/h steady state and just ease into higher loads. If nothing bad looks like happening, I'll start a ramp run.

For diesel cars, in most instances, I'll start by trying to increase and torque limiters, and maybe increase torque request (drivers wish). Followed by adding more boost, then fueling. As for how much of each to add, unfortunately a lot of it comes down to experience with particular platforms.

Some VERY general guidelines for myself: torque limiters and torque request can generally be raised until you just don't gain anything. Boost I sneak up until I don't see worthwhile gains (once fuel has been added to match, boost itself will generally do nothing), or IAT's start getting too hot. Fueling can be added until you start getting too much soot or EGT's get too high. Now, if you have a DPF in place you won't see any soot and end up doing regens all the time. This is where having a lambda meter is critical, as it will give you some INDICATION of where you need to be. Stay leaner than 1.25 lambda you generally won't have issues with significant soot on most common rail diesel unless it has a mechanical problem. In heavy towing applications, EGT may still become a problem though.

If you are working on late model, small euro diesels though, they may already be richer than this right out of the box, as rich as lambda 1 in some conditions, there's not a lot of wiggle room there and I won't make comment on those specifically.