I'm a newbie to the rotory world so this is a little different. I have a 1983 rx7 gsl, the only MODS- Weber 48ida carberauter and k&n filter. Other that that car is stock. this car runs decent, does kinda sputter when gas slammed. May need carb tuned? I'm running 1&1/2 turns out on fuel/mixture and 1/2 turn out on speed idle. Now for the big problem. when revved over 3000rpm it start shaking/vibrating , also when driving and when the engine revs when down shifted around 3k and above it does the same. I checked motor/trans mounts and the trans mount had missing nut. So I got one and put it on. I feel like it made it a little bit quieter but still is pretty noticeable. I can feel it mostly when my hands on shift ****. My throw out bearing spins a little bit when clutch released, could that be the prob?? Helpp any thoughts would help, thanks!! - Denton C

 

u-joints?

 

Vibration in nuetral?

 

I way maybe thinking ujoints? But then again it does the same in neutral. Yes it starts getting bad about 3k n up

 

lots of things that you should check out.
U Joints,engine mounts,trans mount,diff mount.
Even bad tires or a bad wheel can make the car shake..or even a bad ball joint.
I had one that would only wobble at 50mph.

 

But tired ball joints u joints etc.. wouldn't shake when I'm parked and reving would it? Motor mounts are solid.

 

If it's not in gear and parked then the only options are motor mounts, trans mount, flywheel/clutch, or rotating assembly.

 

What's the rotating assembly? I checked the trans mounts and a nut was missing on the middle bold so a put a nut on and I feel like it helped a little but not much. The throw out bearing spins a lil when I realese the clutch, could that have something to do with it?

 

^This.
Rotating assembly would include the engine's internal moving bits...like seriously mismatched rotors. It might be worth-while to try checking that the FW is tight on the end of the e-shaft and the pressure plate bolts are all tight. Thinking you could do that through a bell housing inspection hole if the FB has one.