[HOWTO: Traction Control]

On 3/14/2019 at 12:50 PM, Roland@pcmtec said:

Ok so the BF (what this guide was originally written for and tested on) has a simple auF2233 table which is a lookup of torque reduction ratio and spark delta to command.

The FG uses a much more complicated 3D model. In the FG the spark delta commanded is calculated using the following equation which is derived from what I imagine is an auto generated mathematical model:

Torque_ratio_commanded = 0.8 (eg we are asking for a 20% reduction in torque via spark retard)

K = auF1256(rpm,load)

K = -0.00032  (4500 rpm and 1.7 load in HAER1UB)
Torque_ratio_commanded = 0.8;
Spark_Delta = -Math.Sqrt(-(4 * K * (1 - Torque_ratio_commanded))) / (2 * K);

Spark_Delta = 25 degrees

Knowing this you can see that if you want more torque reduction, you need to reduce K

Eg a value of K = - 0.00016 would result in 35 degrees of spark retard. A value of K = -0.00064  = 17 degrees of spark retard.

So if we wanted to achieve the same outcome in an FG we would multiply the spark retard table on full load by say -0.5

Here is the original auF1256 table in an FG

Here is the new table with approximately 25% more spark retard

This actually gives us a lot more control over the spark retard for traction control in some regards, if you wanted aggressive traction control to only occur at certain loads and rev ranges, you can now achieve this. In the BF this would not be possible.

Remember this is used for all torque reduction events, so this will affect your transmission shifts etc. The BF version would not affect your transmission shifts as you could only modify the low torque ratio settings.

Hi Roland, my tables only go up to .95 load. strategy HAFDDB6.

How do I go about torque reduction under full load?

[Crackle and pop like Audi RS3 Golf R or Focus turbo]

On 11/30/2018 at 6:40 PM, gelousi said:

Yes rpm cells, you can also add cells and make it go from - to + in 500rpm incriments have to play and see what sounds best 

How can I add extra cells?