boogie man down spool on diesel 6's?

[Stoive]

what makes the roaring down spool noise on cruiser and patrol 6 cylender engines?

i have mates with patrols, identical TD42's and one is silent compared to the other, both big exhausts and no mufflers but different turbo kits

i also know of 80 series cruisers with the same squeal sound, wondering if anyone knows what it is.
intercoolers or piping change it at all?
wastegate designs?

i also drive a heavily modified petrol turbo engine in my other car with the same sound, but it "chops" and isnt constant like the diesels (if that makes any sense?)

i know on my engine, it is the piping from the compressor housing to the air filter, if i change that from a bend to a straight pipe, i can make it almost silent, wondering if the diesels are the same

[Jacked]

here we go again

http://www.outerlimits4x4.com/ftopic159294.php

[mkpatrol]

here we go again

http://www.outerlimits4x4.com/ftopic159294.php

BWAHAHAHAHAHAHA

[Stoive]

yes that is a thread on the same sort of topic, it still explains nothing though, and i wasn't asking about turbo whistle, or even that i am trying to make noise or whatever, i dont even own a turbo diesel.

obviously they dont do it stock, and one particular modification will change the noise, i was just asking a curious question

so anyone with experience?

[Jacked]

it has to do with length of pipeing, blow off valves or not, type of airfilter, type of turbo, coolers. some do it stock some dont.

[badger]

1 car is cooler than the other