The GMx series turbos will build a couple psi with a TM and no load, but only for a second or two. Boost is dependent on fueling, thats what creates drive for the turbine.
Does it build boost when driving or is it flat?
If none while driving, you have a wastegate problem or something is wrong with the turbine, compressor or the shaft/ bearings.
Alternatively, it may also have a boost leak somewhere in the intake manifold.
Originally Posted by ebarresi5894
its a small turbo its gonna have turbo lag....
Smaller turbo = less "lag".
Bigger turbo = more "lag".
The GMx series turbos build boost instantly, no lag. They are sized and designed to work this way.
At least, no "lag" on one that is working correctly.
An electronic 6.5 that smokes black when driving indicates a lack of air supply for the fuel commanded. That means a turbo mechanical or control problem of some sort or perhaps a boost leak.
filthy air filter will also make it smoke a bit black from lack of air, but it would have to be almost clogged solid.
I would suggest you might have a problem with your wastegate or "homemade" TM....
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