This isn't what people are referring to
I have 18" rims and I definitely feel the bounce/porpoising on concrete roads. To a much lesser extent on blacktop.

You're right that porpoising is minimized at high speeds (80+) but I also like to keep tickets to a minimum.

I know the car is not an SUV and is supposed to have a stiff suspension. No complaints there.

To me (and many others) the Z's reactions to bumps feel wrong in some conditions. WHen I have people in the car who are used to other sports cars, and they experience the bouncing, invariably the response is "What's wrong with your car?"

Like you mentioned, most people believe the issue is the non progressive springs and/or the shocks. Replacing springs with Eibachs or the whole suspension with Nismo S-Tune fixes the porpoising issue.
I'd let you check my car out but I am in IL.

 

I'm getting a grind, but I'm not convienced it is with rev matching. How can you get grind when the clutch if fully depressed? I'll shift from 1st to 2nd and when moving the shifter, I will get a nasty grind with the clutch hard pressed on the floor. The feeling is very similar to trying to shift into reverse while the car is rolling. This hints at synchro problems but I'm not mechanically inclined.

What I noticed today is that if I drive in 1st up to about 4.5K - 5k RPMs like a slow acceleration, quickly depress the clutch and wait for the RPM's to drop for 2nd gear, I'll almost always get a nasty grind (clutch still fully dpressed).

Now I get it from 2nd to 3rd and from 4th to 5th. I have an appointment with my dealer next monday. My last car (MR2 Spyder) never did this. So, I do not think it is my driving style.

Tim

 

...I understand what many people here are saying about having to be at higer revs (rev matching) to get a smoother 1st-to-2nd, but that still doesn't explain (as icepop456 mentions) why I am many times getting a grind with the clutch fully pressed to the floor, shifting right before redline (not hitting the limiter). I don't get a grind shifting at low rpms (I shift gently for everyday driving). The notchiness I can see being part of the beefier, precise gearbox/tranny, but I still don't see why the grind should be there when driving the car "hard". This is after all a performance car....

 

IMO notchiness is one thing but a grind is a problem that should be addressed by Nissan. I don't get any grind and there shouldn't be any.

It seems strange to me that we all have the same MT and car and there are so many different experiences with the MT. You could understand the issues with the early build dates, but that doesn't seem to be the only controlling factor. It seems like there are random QC issues with the tranny manuf. or assembly.

Also, you never hear anything from peeps with ATs and you would think just the opposite would be the case - a highly reliable MT should be like rolling off a log for Nissan.

 

If you are getting a grind at WOT when you upshift with the clutch fully engaged, there is something wrong and you should report it to your dealer. Take a Service Writer or the Manager preferably, for a test drive and demonstrate the problem. Open a file at NNA, if you haven't already and keep after them to fix it or order a new transmission for you or clutch or both. Has anyone had clutch problems or do you have transmission problems first?

I am asking seriously. If your clutch is flat to the floor, but not fully engaged, you sh/would get a grind at WOT because you are putting maximum stress on your drivetrain. A faulty clutch can do fine at low to medium revs, but fail to engage at redline. I am bringing it up because I haven't seen it before in these threads.

I probably just missed it, right?

 

First tranny was grinding 3rd gear. Second tranny is starting to grind 2nd gear when i am shifting fast. Uh-oh. Time to get another tranny.