Cure for high speed nervousness?

SPDKING

What are people doing to cure the high speed nervousness of the Z34?I was doing about 65 at highway speed and someone suddenly were hard on their brakes ahead of me to avoid a fridge that fell off of a pickup truck.

When I went hard on the brakes I quickly reacted because it looked like I wasn't going to stop in time to avoid a rear end collision when pressing the brakes and changed lanes because I didn't see a car next to me just 20 seconds earlier. I felt a lot of vibrating in the steering wheel and in the car so I assume I overloaded the front tires so much that I was losing grip, the car also seem to dart uncontrollably for a split second and regained composer.

I figured with the tires and new shocks and sway bars (I know they only come into play in hard cornering), this might cure the Z34 nervousness but it felt the same as it did when it went over road imperfections at high speed.

Has anyone tamed this for the street and track? It scares the crap out of me and my 350Z never did this, it always felt flat and stable at high speeds even in stock form. Do I need to soften my front struts? I'm running full soft in the rear and full stiff in the front with brand new tires with only 100 miles on them. I know I need coilovers in the future but who's solved this nervousness at high speed issue? If it's doing this in emergency situations on the street, I feel like it's going to do this at Willow Springs if I'm hard on the brakes and then trying to change direction quickly after getting off of them. Will making the front full soft fix this?

__________________
Stillen front and rear sway bars/Continental Extreme Tires/Annex Suspension Coilovers/Z1 Oil Cooler/Borla Catback Exhaust/K&N Drop in filters/SPL

OptionZero

sounds like you need an alignment

__________________
OptionZero Build Thread

SPDKING

I had an alignment after I got the brand new tires. The sway bars and shock+struts came after

__________________
Stillen front and rear sway bars/Continental Extreme Tires/Annex Suspension Coilovers/Z1 Oil Cooler/Borla Catback Exhaust/K&N Drop in filters/SPL

OptionZero

You got an alignment BEFORE you installed shocks/springs that lowered the car?

You realize those parts affect your alignment?

__________________
OptionZero Build Thread

SPDKING

My car is stock height, I just have sport dampers and shocks with stock springs

__________________
Stillen front and rear sway bars/Continental Extreme Tires/Annex Suspension Coilovers/Z1 Oil Cooler/Borla Catback Exhaust/K&N Drop in filters/SPL

Rusty

If you have sport dampers. Are they oem? How do you adjust them?

__________________

浪人 - 殺し屋
"The Difficult Anytime, The Impossible By Appointment Only"
http://www.the370z.com/members-370z-...o-journal.html

Trips

Sounds like your rotors are warped.

You shouldn't have any vibrations while braking.

You may also have a brake caliper slow to react and can also lead to pulling to one side IF your alignment is good.

__________________

Spooler

If you darted when you stomped on the brakes it was more than likely due to brake pad buildup on the rotors. This is also why you had some brake pedal shudder. That is why I don't care for the stock brake pads. They are bad about brake pad build up on the rotors. I would suggest you re-bed the pads in and see how it goes. It will clear of the brake pad deposits off the rotors. Your braking should come back to normal.

BGTV8

Did you trigger the ABS ?? as well as Stability/Yaw Control when switching lanes ........

Can be freaky if you are not expecting it

I have no problems with the Z34 platform on the track.

SPDKING

The ABS light never came on, I didn't jam on them that hard to trigger it but when I switched lanes quickly I wasn't on them at all and it almost made a noise like those Front wheel drive cars that understeer. I have about 23k miles and had a check up on the suspension, brakes and any chassis bracing and only found that the stock front passenger strut was leaking and nothing else. Everything was basically all stock. Would the stock brake pads be that bad to cause this? Or the rotors?

__________________
Stillen front and rear sway bars/Continental Extreme Tires/Annex Suspension Coilovers/Z1 Oil Cooler/Borla Catback Exhaust/K&N Drop in filters/SPL

redondoaveb

Did you talk to Alex about the issue when you took it in to him?

__________________
Fast Intentions "Stage Seb" twin turbo #098- Specialty Z/Tial-Xonarotor/CJM/Ecutek/HKS/KW/SPL/Hotchkis/Rohana/Toyo
700+whp

SPDKING

I didn't, I've had this before if I was cornering too hard with some crappy Goodyear's that were on it when I got the car. No braking involved at all in that situation and that went away after I switched tires. I didn't have this until I braked hard yesterday and then switched lanes.

__________________
Stillen front and rear sway bars/Continental Extreme Tires/Annex Suspension Coilovers/Z1 Oil Cooler/Borla Catback Exhaust/K&N Drop in filters/SPL

OptionZero

an alignment is maybe a hundred bucks
most places will actually check your tires for balance and inspect your brakes for free, or a minimal cost

i'd do that before buying stuff

but eventually

coilovers and adjustable everything and sticky tires will solve alot

__________________
OptionZero Build Thread

SPDKING

I have the sticky tires already, I'm going to check the alignment tomorrow at the shop

__________________
Stillen front and rear sway bars/Continental Extreme Tires/Annex Suspension Coilovers/Z1 Oil Cooler/Borla Catback Exhaust/K&N Drop in filters/SPL

Z's

Just my 2 cents, I had an 09 Sport Package before my current 14 Nismo, and it never felt unsteady at any speed under any circumstance. But after just a week of driving my Nismo I noticed exactly what you described, under hard braking it would quickly pull one way or the other and the back would feel loose. So I got rid of the 245s on the front and went to 275s and my problem pretty much diminished. 2 different solutions to the same problem? I don't know, but just a thought for anyone else reading this.