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Their proper name is/are piston cooling jets and thats their purpose as well, cooling the piston crown and they're a part and parcel of high performance high output turbo diesels.

These pistons...

Good service practice will stop this. People that leave oil in the engine for too long and it eventually turns to sludge and gums up the inside. If the engine then continues to run and someone...

In simple terms....
slow spool up rate = lower boost rise across the wide rev range
fast spool up rate = rapid boost rise across much narrow rev range

In another words having near max boost...

Given the mods you already have, you may get a bit more benefit from a dyno tune than would a standard setup like mine. Nissannewby, or others with similar mods, would be able to give you a more...

Depends how competent you are with tinkering with it. Without a chip there isn't to much you can play with on the 3.0. You can use them for comparisons and they are great for this seeing what mods...

Spot on. It won't work. You need to use a Dawes valve. I don't have any left. Sold 20 in 10 days :/ I have another 30 coming with EGR plates and needle valves which will be much cheaper than the ones...

I called in at my local car accessory shop. He had a kit with all different sized rubber caps. You don't really need to block any of the ports as you will completely bypass the controller. The...

No. A drift boost controler will not work as a replacement for a Dawes valve. They are designed for wastegated turbos where you want to bleed off a bit of boost going to the accuator. It is...

Depends....

If you leave the Boost Control Solenoid connected in the system you don't need the Needle valve. You would choose this option if you are only concerned about preventing over boosting....

you may find it spools up too fast, I fitted my needle valve under the bonnet as set and forget, others mount them in cab.
See how you go first but I would fit it $85 from Dependable Distributors...

Sometimes when the EGR is blocked the boost increases a small amount. If you were getting 18 psi you would be right at the upper limit. If you go any higher (it does vary a bit) the ECU sees this...