I'll have it looked at. I'd hope not at only 17k miles on it!!

Have you tried not going that fast on dirt roads ?....

Yep the roads i noticed it on were rutted out from semis also.

I hit 148mph.... No problem, but I have sport pig.

What do your tires look like? That can most certainly play a factor or it could very be that you've just never driven that fast in a sports car (no shade).

I have 4 Yokohamas and that can be possible it could just be me, I'm going to still bring it into the mechanic to have the alignment done

I have a sport with the forged 19" wheels, and I've found that the car is extremely sensitive to tire pressure. If it is a couple pounds too high (cold pressure btw) the car will seem to wander or drift in the lane at normal highway speeds. I dropped the pressure 5 lbs (found out I had a bad tire gauge...) and it was a different car - totally stable.

Get a good tire gauge and check the tires. Too high is just as bad as too low. The correct tire pressures are on a sticker on the inside of the driver door jamb.

Good luck!

Our cars have a very short wheel base. Any of the above effects the Z more than other cars. Corvettes have 8-9 inch longer wheel base just to aid high speed. Even the 350 is longer, just park next to one and you can see it.

Check tires/pressures, then take it in to the shop.

check tires, suspension, alignment.

at 120+ the car feels like you're at a cruising speed on the highway. even up at 150-170 (on roads in mexico) it still feels planted.

Don't listen to this guy ^^^. He only uses his right foot. :stirthepot:

No but seriously.... 305's or :eekdance:

haha hate you. :bowrofl:

but even with stock 275 rears I topped it out (pretune) at 160.

the stickier 305 rears do add a little more confidence :tiphat:

I never drive above the posted speed limit as far as you know.

Alignment for sures and balance


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A couple of things come to mind; look at and measure the tread depth. If you are north of 30k on the car and haven't bought tires, then there is your issue, especially if you bought the car new. The factory Advans are only good to about 30k, after that, they get squirrelly as hell. :eekdance:



On a side note: Where in radioactive land (NJ) can you drive 80+? :confused:

65mph speed limit means you gotta do about 80 to not get passed. As South Park said "It's a Jerzy thing".

As for the OP, start with something simple. Check your tire pressure and go from there.