mmaddock said:I'd also be concerned about the inherent higher combustion temperature causing problems, not to mention emissions.
I am surprised, maybe the MOT test doesn't test very well under condtions where the EGR is most effective??No issues for emmisions when done.
The reason I ask is that now I think about it, my P38 has a bit of a problem under certain conditions that could be down to a faulty EGR. Will have a look!Regarding egr on a p38 to be honest ive not looked
Now you've lost me there! Are you saying that by not introducing hot exhaust gas into the inlet that the inlet temperature is reduced?The combustion temperature should be reduced due to lower inlet charge temperature.
mmaddock said:Now you've lost me there! Are you saying that by not introducing hot exhaust gas into the inlet that the inlet temperature is reduced?
Exactly as you state, virtually un-cooled exhaust emissions, direct from exhaust manifold, fed back into inlet charge via the egr valve are bound to increase the inlet charge temperature.
'Fresh' air thru air filter, warmed by passing thru turbo by hot exhaust manifold is then cooled by passing thru the intercooler, egr gas isn't.
mmaddock said:I wonder in reality how much difference it makes? It must do something! Car manufactures do not just stick things on for the sake of it - it costs them too much.