31-05-2012, 10:35 PM
It's worth looking at yeah.
Certainly worth doing some power tests too, see if the output changes. Any requested injection amount must be split internally over the injections, so running a given IQ later probably means 'general' end of injection is later too, which might mean higher EGT at full throttle with tuning, which might not be ideal...
All needs a proper test really to see, but I'm betting later changes were nothing really to do with cabin tapping noise reduction but more emissions control. Later cars might just have better noise insulation to begin with for instance.
I'm also guessing the reduced advance might make the car sound more diesel clattery from the outside, despite being less tappy inside.
Hmmmmm
Dave
Certainly worth doing some power tests too, see if the output changes. Any requested injection amount must be split internally over the injections, so running a given IQ later probably means 'general' end of injection is later too, which might mean higher EGT at full throttle with tuning, which might not be ideal...
All needs a proper test really to see, but I'm betting later changes were nothing really to do with cabin tapping noise reduction but more emissions control. Later cars might just have better noise insulation to begin with for instance.
I'm also guessing the reduced advance might make the car sound more diesel clattery from the outside, despite being less tappy inside.
Hmmmmm
Dave