turbo doesn't whistle
 

I'm fairly new to the diesel world, but I'm working on a 93 Cummins L6 turbo.

I can't figure out why the turbo doesn't whistle like normal. Intake appears clean. Impeller freespins for several seconds after engine is turned off. No difference with/without air filter. No black smoke from exhaust (except on initial start-up), yet decent pressure out of tail-pipe. In reading a few other threads, it seems that perhaps the air tube from the turbo to the intake could be dirty. What do ya'll think?

I have owned a couple diesel turbos and none of them whistled

the first gens, dont have map slots in the compressor housing, the turbos with map slots make a lot more noise, the first gens are also turned down a lot and have large exhaust housings, so they dont make much boost

That's good to know! Thanks. I was concerned that this would be one more thing added to the list. I can quit worrying about it now.

so basically if its possible? which i dnt knw if it is or not. but get a turbo offof a second gen. and take out the turbo silencer and shove it on there. like i said. i dnt know if the turbo housings or mounts are the same? but im sure someone could tell u.

kind of... everything will bolt up and it is a good upgrade, but the exhaust housing is an inch longer, so the downpipe needs to be modified to gain the clearence