75 280Z - Front End Float @ Speed

[HusseinHolland]

I have noticed that the front end gets flighty when I'm up around 80 +, depending somewhat on the roadway, but definitely a touch hair-raising. Original air guides/ valance are present behind Xenon spoiler.

I have new Eibach lowering springs, all new struts, all new suspension bushings (all poly except the rear caster rod bushings),, etc., front and rear. Wheels are 15" W/ Hena Forceum tires (forgot profile, I'll edit later)

Anyone have similar experience?

[Mark Maras]

Years ago I had my bone stock 240 on a few race tracks. The rise and fall of the front end during acceleration and braking was annoying, but the rise at 120 mph + was frightening until I was confident the car wouldn't blow over backward. Part of that fright was PTSD from a previous experience in an Euclid dump truck that went down a collapsed bank in reverse and ended up on its top.

[siteunseen]

I have that same spoiler and the same issue. The wipers start lifting off the windshield too. 

[Mark Maras]

 The wipers may lift at high speeds but at least they're slow too.

[davewormald]

4 hours ago, Mark Maras said:

Part of that fright was PTSD from a previous experience in an Euclid dump truck that went down a collapsed bank in reverse and ended up on its top.

Driving a Euclid must be something! Rolling in one must be terrifying. Which model? I spent the summer of 1982 in Whitehorse, Yukon, working at a construction site. They had a few Euclids there. For a while they used to drive me around on the hood so I could take extensometer readings at the rock face. When they got bored of doing that I found a lot of other creative, if not entirely safe, ways to get to the extensometers.

I did once get my current 240Z up to ~120mph on Hwy 401 late at night. Once I got there I found the steering wheel to have no feel whatsoever. I slowly let the speed come down while my heartrate continued to go up. I don't think I'll do that again.

[siteunseen]

2 hours ago, Mark Maras said:

 The wipers may lift at high speeds but at least they're slow too.

Ha! I stumbled right into that.

Me and you, George and Lennie. 

See that^^^, I like bunnies. 

Edited May 3 by siteunseen

[Mark Maras]

2 hours ago, davewormald said:

Driving a Euclid must be something! Rolling in one must be terrifying. Which model? I spent the summer of 1982 in Whitehorse, Yukon, working at a construction site. They had a few Euclids there. For a while they used to drive me around on the hood so I could take extensometer readings at the rock face. When they got bored of doing that I found a lot of other creative, if not entirely safe, ways to get to the extensometers.

I did once get my current 240Z up to ~120mph on Hwy 401 late at night. Once I got there I found the steering wheel to have no feel whatsoever. I slowly let the speed come down while my heartrate continued to go up. I don't think I'll do that again.

 I don't remember the model. It was probably built in the 40s. It didn't roll, it went down an embankment backward, bucket up, dug in, and flipped on its backside, like an upside-down turtle, which explains my fear of the nose lifting on my Z.

 Turn one at Portland International Raceway. 120+, the steering is best described as turning the wheel and wondering how long it will take to turn. That was fun learning to steer with the throttle.