Subtle active aero?
 

I have a stock looking PW 09. Wondering what the options are for improving general downforce \ stability in the 80 to 110 mph range. Feels a little floaty at times. Would like it to feel better planted without adding some overly speed racer wanna be looking stuff to the body. Any proven but subtle aero options out there? Thanks

The nismo body kit reportedly generates around 150 pounds at 75mph... All I know is that mine is deceptively capable at triple digit speeds; if you can't see the dash, you have no idea that you're at "go directly to jail" speeds. :)

At those speeds, you might just want to invest in some better tires. I’ve been on the track at 140+ with the stock Sport trim and had no issues.

Front sway bar and tires go a long way. Technically the car holds just fine on smooth roads. The car has the mechanical grip, but the feel of corner entry (or in this case, high speed corrections) feels a bit numb at some point — as if the dead zone widened up.

That could be due to the staggered tire setup. The rears have more grip, especially under acceleration, and most people don't bother with a rear sway bar upgrade unless the tire setup is closer to square

You could first try the chin spoiler and wind deflectors if your Z currently doesn't have them.
I notice going from the 2014 base front fascia with the chin spoiler and wind deflectors to the 2015+ nismo fascia the car feels a bit more twitchy in the front. Maybe the downforce working, I don't know. The wind deflectors don't work on the nismo fascia.
Also, maybe just a simple subtle rear deck spoiler could help.

Thanks for your thoughts and suggestions. I'm leaning toward some sort of front lip and subtle rear wing. It's not a big deal and never felt unsafe at those speeds. I don't regularly travel in the triple digits but hit some wide open highway on they way home from Maine and had a little fun. The bumps were unsettling for sure at that rate.:eekdance:

As per forum rules, you may not want to add that you were on public roads hitting triple digits... "Discussion of illegal activities are not allowed." Just a friendly FYI.

May want to check your wheel alignment; especially the rear toe.
Not enough positive toe on rear will cause this as well.

Suspension will make a big difference as well if you are still on stock springs. The stock springs like to unload a lot. I noticed this really bad in downhill off camber situations. Changed out the springs & made a world of difference in handling & making the car more planted.

YMMV :cool: