In the thermostat housing on the front of the engine were the radiator hose attaches
I had an 84 turbo that I had up to 145.
You have water in the mass air.
If you really want to learn about your z go to eBay and buy you a CD that contains the repair manual. They are cheap. I have one for my 93z and it is great.
THAT IS THE TRANSISTOR IGNITION UNIT WHICH SENDS OUT THE SPARK TO THE SPARK PLUGS AFTER THE COILS. IN THE EARLY Z32 300ZX'S, THERE WAS A RECALL TO GO TO NISSAN AND GET THAT CHANGED FOR FREE
All spec's including speed can be found here http://www.cargurus.com/
go to auto zone site,enter year,make,engine size,then look up thermostat,then to right off screen it will have repair guide,click on that and it will show and tell you how to replace,good luck.
I have put this answer up many times. Go to DTAmotorsports an download you a free service manual. http://300zx-twinturbo.com/cgi-bin/manual.cgi
because that is just the type of car that does that.
With the spring part inside the engine
Now this depends on whether your car is a manual or an automatic and a twin turbo or a naturally aspirated version. Go to http://300zx-twinturbo.com/cgi-bin/manual.cgi There it will show you how to replace it.
Go to DTAmotorsports and download you a free service manual. http://dta-motorsport.com
Its one that is in the middle of the timing belt cover, so under neath the upper part its located in a silver pipe that has a triangle joint. To replace it you would have to remove the fan cover, and the fan, and a couple of belts and u should go on from there to remove the 3 screws on the triangle like pipe and inside is ur thermostat