hi every one ,
I have z31 1986 turbocharged , so my problem is that the torgue is too low . I'm not sure what is the cause ?!
I think that the turbo might has lag , I'm nor sure
what do you think
thanks

 

What do you mean has lag? The early turbo axis used a t3 turbo I believe, and were used to help with low end torque gain so there's very little lag to be felt from the turbo itself

 

If you mean the response time between depressing the pedal and the car reacting, I would look at your iac and tos to start, and download the FSM if you haven't already for your year, it's difficult to read at first but huge help.

 

Manual or auto trans ?
white smoke ? Head gasket leak a possibility
CC plugged enough
timing, plugs breaking down , ign arcing , feul probs
Brake grabbing .All posible