guys ? about revving characteristics of our cars
MBWorld Fanatic!
Joined: Sep 2016
Posts: 1,175
Likes: 130
From: NY
2010 C63 2019 GLA45
The answer will be by looking at live data from the Star system.
With a compression ratio of over 11:1, the factory has probably implemented a complete engine knock protection strategy in the software.
The way this is done is the timing advance has adaptive values. There is a base level of timing and for every duration of time where no knock is detected, timing is added. When knock is detected, timing is pulled.
Basically, they keep it just below the knock threshold.
Now, there are factors that make knock likely, like intake air temperature. If IAT is high, it could shift to a low-er timing table.
If EGT is high, it has to protect the converters, until the egt drops.
High coolant temp, high transmission temp and so on. It doesn't need to go all the way into a limp mode every time, it just turns it down a bit.
I mean, I have seen this with other cars and it would be surprising if this doesn't have a very solid strategy.
With low timing the car will rev slower and feel sluggish.
With a compression ratio of over 11:1, the factory has probably implemented a complete engine knock protection strategy in the software.
The way this is done is the timing advance has adaptive values. There is a base level of timing and for every duration of time where no knock is detected, timing is added. When knock is detected, timing is pulled.
Basically, they keep it just below the knock threshold.
Now, there are factors that make knock likely, like intake air temperature. If IAT is high, it could shift to a low-er timing table.
If EGT is high, it has to protect the converters, until the egt drops.
High coolant temp, high transmission temp and so on. It doesn't need to go all the way into a limp mode every time, it just turns it down a bit.
I mean, I have seen this with other cars and it would be surprising if this doesn't have a very solid strategy.
With low timing the car will rev slower and feel sluggish.
