EGROriginally Posted by harrymoto
The EGR doesn't feed back into the intake hose it feeds into the inlet manifold via the EGR valve so blocking EGR won't do squat for the MAF sensor, Turbo etc.
The main reason for blocking EGR at the expense of pollution control is to reduce particulate contamination of the oil.
A very handy side effect is lower EGT's at low to mid throttle and low boost cruise and also improve power at low to mid throttle and general cruise,
EGR is normally blocked at high throttle/power by the EGR valve anyway so when you put the welly into it there is no difference.
The other big issue is that if you do block EGR you will need to either adjust your Turbo Actuator or fit manual boost control usually in the form of Dawes and Needle Valves and most engines will also get a check engine light and P0401 engine fault codes.
Easily fixed by a Scangauge or drilling the EGR plate but that defeats the purpose of blocking it IMHO
Catch Can
In fairness to Mr Nissan, AFAIK there isn't a diesel engine LV sold in Oz by any manufacturer that has a catch can as a factory fitting. There may be some but certainly none I have come across.
Modern high pressure diesels are now at a stage that a catch can usually isn't warranted however older stuff certainly is a different issue (6.5 Chev for example).
The CRD's seem to vary between engine as to how much oil mist they blow past.
I was lucky in that mine did very little so it didn't warrant a catch can, others have reported noticeable amounts.
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