Look, laws of physics apply, you'll need to lower the boost to be able to feed exhaust gases back in to intake. Low boost equals high EGTs = bad news for diesel engine. Yes, ZD30 CrD engines are much better at handling higher EGTs than Di but that doesn't mean that it is good for them in the long term.
CrD control system is much more sophisticated than primitive/rudimentary Di control. Boost of 18 psi is normal on CrDs.
CrD not only uses MAF but also MAP and MAT to correctly calculate optimal AFR. (not really doing a great job there though)
Again that doesn't mean Jack if you are feeding crap down your intake mixing it with oil vapor from crankcase ventilation layering the intake manifold and restricting the airflow.
This has consequences in reduced engine life and increased maintenance costs including fuel consumption. So if you are planning to keep Patrol for 4 years (or while under warranty) max on lease like plan than don't bother fiddling EGR, Dawes, boost control EGTs what not.
Current emission control tech punishes you the consumer with higher costs and reduced reliability. Basically car makers are making it your problem while handsomely profiting from it by selling you crap cheap technology which makes you to fork out more and more often. Its a win for them and oil companies because these techs also increase fuel consumption.
You want to effectively reduce emissions you need to reduce fuel consumption. You will reduce it by making the engines more efficient and powerful at the same time while reducing their size.
So variable camshaft timings or even camless engines, variable hybrid turbo compound chargers, cylinder switching off technologies, water injection etc.
Instead of outdated technology which costs users fortune like DPF, SCR, EGR, AHI and whatever these assholes would do anything but making better efficient engines.
Did you know that common rail diesel injection patent was applied for in 1911. It took 80+ years before we started using that technology, for Nissan even longer they started putting that tech in their ZD30s in 2007
Its your choice. There is no point for Dawes valve alone on CrD. ECU has the boost under control quite well. There is a point for Dawes and needle valve if you want better torque down low, improve power delivery and tractability.
Would I do it on mine if it was CrD, hell yeah. The difference is phenomenal on Di so it will be even better on CrD me thinks I'd at least try for the cost of it. ($150)
Have you ever wondered why CrD has the same power and torque output as Di. It makes no sense when D40 2.5L (Navara) has more power and torque than 3.0L.
Originally Posted by Rumcajs
Look, laws of physics apply, you'll need to lower the boost to be able to feed exhaust gases back in to intake. Low boost equals high EGTs = bad news for diesel engine. Yes, ZD30 CrD engines are much better at handling higher EGTs than Di but that doesn't mean that it is good for them in the long term.
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