Puzzled please help

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Foxy

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I have a 09 Spain d40 6 speed manual. Problem is when at idol and stationary it won’t rev up unless the clutch is in and in gear. Like ya can’t rev it up to see how the new exhaust sounds is this normal. Runs and drives fine lacks some up and go until turbo kicks in
 
It actually sounds normal.

New turbo diesels are unlike petrol cars or old mechanical diesels. The ECU knows when there's a need for actual power, and when there's not. And in neutral, you don't really need it - so the ECU saves the turbo by not spooling it up as much and it won't deliver as much fuel.

In gear, and with the clutch in, you'll get more - because you might need to take off up a hill (and Nissan know what happens when you're at the traffic lights next to a Toymotor).

You could check the NPS, unplug it to make the car think it's never in neutral, but it's really a design feature of the car.

As for lag ... it's a D40. The Garrett 2056V does take a second to spool up. It's something I got used to. A smaller (lighter) turbo might spool faster but won't breathe enough at the top end. A larger turbo could provide more boost but will take longer to get up to pressure. Turbochargers are a tradeoff, but they're easier to manage than NOS and don't need anywhere near the bonnet opening of a blower.
 
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