Extreme bump steer??

NoHyperbole · 02-03-2017, 10:03 AM

Quote:

Originally Posted by SouthArk370Z

Tire compound and tread pattern have a big effect on tire slip/noise at extreme angles. This may (or may not) be why y'all didn't notice it on other cars. It happens to all cars; just not very noticeable on many.

That is true; however, in this case, both my 350Z and 370Z were equipped from the factory with the same Bridgestone RE050 tires, just in different sizes.

As I pointed out in an earlier post, the only major difference between the two cars is their caster specifications (about +7.0 for the 350Z, but about +5.0 for the 370Z). More positive caster, among other things, equals more heft in the steering and a feeling of more stability; less positive caster equals less heft and a feeling of quicker turn-in. Driving both cars back-to-back will reveal this immediately.

Hotrodz · 02-03-2017, 10:19 AM

Quote:

Originally Posted by NoHyperbole

That is true; however, in this case, both my 350Z and 370Z were equipped from the factory with the same Bridgestone RE050 tires, just in different sizes.

As I pointed out in an earlier post, the only major difference between the two cars is their caster specifications (about +7.0 for the 350Z, but about +5.0 for the 370Z). More positive caster, among other things, equals more heft in the steering and a feeling of more stability; less positive caster equals less heft and a feeling of quicker turn-in. Driving both cars back-to-back will reveal this immediately.

There are enough differences in the geometry and design of the two cars that you should not expect them to act or feel similarly. Some folks prefer the handle characteristics of the 350 over the 370.

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Jhill · 02-03-2017, 11:49 AM

Quote:

Originally Posted by Hotrodz

There are enough differences in the geometry and design of the two cars that you should not expect them to act or feel similarly. Some folks prefer the handle characteristics of the 350 over the 370.

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Yes we're talking about the same thing, it is not a power steering noise etc it is an actually skipping feel at tight radius at slow speed. Felt it the first day with the z but really didn't pay any attention to it after being a GM tech and working on tons of corvettes that have this same trait but even more so. Honestly would not worry about that at all as everyone here has the same thing so it's not as if yours is doing anything different. As for bumpsteer I don't feel that at all and usually doesn't become an issue on cars in general untill people lower them.

And that's weird it wasn't supposed to quote hotrodz but whatever.

rambo · 02-03-2017, 06:37 PM

Quote:

Originally Posted by Jhill

Yes we're talking about the same thing, it is not a power steering noise etc it is an actually skipping feel at tight radius at slow speed. Felt it the first day with the z but really didn't pay any attention to it after being a GM tech and working on tons of corvettes that have this same trait but even more so. Honestly would not worry about that at all as everyone here has the same thing so it's not as if yours is doing anything different. As for bumpsteer I don't feel that at all and usually doesn't become an issue on cars in general untill people lower them.

And that's weird it wasn't supposed to quote hotrodz but whatever.

Lol I was reading this thinking "I'm pretty sure that was meant to be quoting my last comment".
I'm thinking I'm just going to buy a new pair of front tires and get a proper alignment done together.
On my way home from work today I was on this horrible rode filled with pot holes and cracked pavement and I could not keep the car straight for the life of me, even with both hands on the steering wheel. It really is dangerous.

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