Extreme bump steer??

SouthArk370Z · 02-02-2017, 07:42 PM

Quote:

Originally Posted by rambo

Oh and for the tires slipping sensation I experience it in both dry and wet although wet is certainly worse.

Happens with wide tires; normal for a Z. Bad alignment may be making it worse.

Jhill · 02-02-2017, 09:06 PM

Quote:

Originally Posted by rambo

Oh and for the tires slipping sensation I experience it in both dry and wet although wet is certainly worse.

If your talking about slow speed like tight parking maneuvers etc. this is normal I would say. Mine does it too and new corvettes do it really bad or last gen vetted when people but wider wheels. Seems to be a trait with wide wheels and lots of caster.

We're talking about a slip like a skipping feel kinda?

rambo · 02-03-2017, 12:36 AM

Quote:

Originally Posted by Jhill

If your talking about slow speed like tight parking maneuvers etc. this is normal I would say. Mine does it too and new corvettes do it really bad or last gen vetted when people but wider wheels. Seems to be a trait with wide wheels and lots of caster.

We're talking about a slip like a skipping feel kinda?

Yeah exactly some type of skipping feeling.
Strange thing is I don't recall my 350z doing this and that had wider front tires.
To make sure we're talking about the same thing I am not talking about the possible power steering whine sound when the steering wheel is turned to its max.

NoHyperbole · 02-03-2017, 10:11 AM

Quote:

Originally Posted by rambo

Yeah exactly some type of skipping feeling.
Strange thing is I don't recall my 350z doing this and that had wider front tires.
To make sure we're talking about the same thing I am not talking about the possible power steering whine sound when the steering wheel is turned to its max.

That's exactly what it is: skipping, slipping, shuddering.

And my 350Z didn't do this either, and it had almost identical front camber and toe settings to my 370Z.

SouthArk370Z · 02-03-2017, 10:37 AM

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.

NoHyperbole · 02-03-2017, 11:03 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, 11:12 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.

^^^ This, the stiffer the sidewall the more you will feel this and as pointed out, this often happens at low speeds but when the car is at speed and the loads on the tires and suspension are increased it will not be noticeable as long the tires do not have excessive wear or the alignment is off.

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Hotrodz · 02-03-2017, 11:19 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, 12:49 PM

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, 07:37 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.

rambo · 02-03-2017, 07:39 PM

NoHyperbole, I paid closer attention today as I was driving and noticed my car actually pulls to the left pretty severely if I let go of the wheel. You stated that your car will drift left/right but generally stay centered.

My assumption is your problem is from bad tires, and mine is from a bad alignment and bad tires.

NoHyperbole · 02-03-2017, 09:26 PM

Very interesting. Thanks for the input.

I hope you get this issue sorted out soon, as I'm sure driving an unsafe car is no fun. Keep us posted.

littlejuanito · 03-28-2017, 12:05 AM

Quote:

Originally Posted by rambo

NoHyperbole, I paid closer attention today as I was driving and noticed my car actually pulls to the left pretty severely if I let go of the wheel. You stated that your car will drift left/right but generally stay centered.

My assumption is your problem is from bad tires, and mine is from a bad alignment and bad tires.

Why don't you replace your outer tie rods with some SPL's ? That may fix the bump steer issue. Any else care to chime in?

02-03-2017, 10:37 AM	#20 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324198	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. Rusty and Hotrodz like this. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

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02-03-2017, 07:39 PM	#26 (permalink)
rambo Base Member Join Date: Sep 2016 Location: California Posts: 92 Drives: 14 370z Sport/Tourin Rep Power: 9	NoHyperbole, I paid closer attention today as I was driving and noticed my car actually pulls to the left pretty severely if I let go of the wheel. You stated that your car will drift left/right but generally stay centered. My assumption is your problem is from bad tires, and mine is from a bad alignment and bad tires.

02-03-2017, 09:26 PM	#27 (permalink)
NoHyperbole Base Member Join Date: Jan 2014 Location: Los Angeles Posts: 216 Drives: N/A Rep Power: 11	Very interesting. Thanks for the input. I hope you get this issue sorted out soon, as I'm sure driving an unsafe car is no fun. Keep us posted.