Rear-end wanders at speed Help please

oscargarza88 · 03-09-2015, 09:06 PM

Quote:

Originally Posted by GSS138

Your initial Toe settings were pretty horrible, I am not clear if you were having the problem with the initial toe settings or on the final toe settings. Your front camber although not bad, could be a lot tighter than -1.3 and -1.8 on the final.

Toe settings will definitely make the car "dartier".

I would try 0 toe in the rear.
back some rear camber out to about -1.1
and get both front wheels to -1.8

Also: Rear sway setting?

With the initial toe setting was indeed very bad. That was right after I installed the camber arm so it was all out of wack. I drove the car with the initial settings to the alignment shop and it quite horrible. And now that you mention it it was doing th same effect I am talking about but way way exaggerated to the point I was only able to go 40mph.
After the alignment it felt good but really only get the effect I'm talking about in the rain. Today was pouring rain and the car handled worse than ever, coudnt go past 45 mph without it feeling unsafe.
Another way to explain is pulling sled on ice with a rope. The sled will wander around as you pull.

Quote:

Originally Posted by Robert Yuras

Two things:
1: The rear end alignment needs to be squared with the front end. Sometimes the rear wheels can be aligned square with each other, but not square with the front. This can create "dog walking", which can give this feeling.
2: you may have a blown bushing on your lower control arms or elsewhere within the suspension unit that appears visually ok, but when load hits it, it shifts.

I know the exact feeling you're talking about and it's very scary.

The guy said there was no camber adjustment for the front so he didn't even attempt to match them better. The front feels solid though. I van tell it'd definitely coming from the back

Quote:

Originally Posted by Robert Yuras

One other thing could be (I know this sounds dumb)...you didn't tighten down the lug nuts 100%

Yes. Just cause you bring it up I'll check them again in the am. Also the spacers while I'm at it.

I'm looking into replacing th tires on Wednesday and will report back with effects if I get around to it.

Thanjs for all the feedback!

Spooler · 03-09-2015, 09:58 PM

Rain issues ehh, sounds like you do not have much tread left or the car is what I call, plowing due to the toe being out of whack. It will make it an ill handling piece of crap in the rain. Get a thread depth gauge and read from the inside to the outside of the thread on the rear tires. That will give us all an idea of what may be going on.

oscargarza88 · 03-10-2015, 06:19 PM

So upon further inspection yes the tires I'm the back are definitely in the Wear bar. So essentially the rear was hydroplaning everywhere... That was scary, and im used to Autox and sliding around but this was different.

As far as the alignment. I've heard some people go zero toe In the back. Is this recommended? Also is - 2 camber too much in the back for a dd?

Thanks

Rusty · 03-10-2015, 07:21 PM

Quote:

Originally Posted by oscargarza88

So upon further inspection yes the tires I'm the back are definitely in the Wear bar. So essentially the rear was hydroplaning everywhere... That was scary, and im used to Autox and sliding around but this was different.

As far as the alignment. I've heard some people go zero toe In the back. Is this recommended? Also is - 2 camber too much in the back for a dd?

Thanks

For track and DD. I have my camber at -1.5, and a hair toed in. Zero toe to toed out will give you snap oversteer at times.

Spooler · 03-10-2015, 06:26 PM

You autoX and the rain bothers you? I love it when it rains. Good wipers and some rainx go a long way. Tires, the less the funner it is, LOL
The 370z actually does really well in the rain.

Jordo! · 03-11-2015, 02:38 AM

Too much toe in the rear.

Rusty · 03-11-2015, 03:53 AM

Quote:

Originally Posted by Jordo!

Too much toe in the rear.

With too much toe. You usually see the edge of the tread blocks start to feather.

kenchan · 03-11-2015, 10:56 AM

oscar- u need new tires. you're down to the wear bars.

Robert Yuras · 03-11-2015, 02:17 PM

Quote:

Originally Posted by Robert Yuras

2: you may have a blown bushing on your lower control arms or elsewhere within the suspension unit that appears visually ok, but when load hits it, it shifts

still going with this, or maybe a broken CV

oscargarza88 · 03-11-2015, 11:09 PM

good news! new tires in the back!

The fronts still look good so im going to hold off for a while.

Still have an alignment due, didnt have time to do it today.
Once i got home after a couple hard corners i realized im at lease 1+ inches from the sidewall so as you guys confirmed way too much camber in the back.

Came to the conclusion of -1.4 camber in the rear with -.03 and go from there.

Seems good but will not know for sure until it rains again.

Until further notice thanks for all the feedback and will report back once i can get a alignment again.

Thanks!

GSS138 · 03-12-2015, 12:02 PM

RE 760 Sports?

oscargarza88 · 03-12-2015, 08:47 PM

Quote:

Originally Posted by GSS138

RE 760 Sports?

Hankook v12 2.
So early update Is he car still feels a bit off. It hasn't rained so haven't tested it fully. Hopefully this plus alignment will fix the issue completelly.

As far as grip they feel a bit more than the stock tires when they were starting to go out. Kind of what I expected for the price. For a dd I think it should be enough dry ad wet grip.

Jordo! · 03-12-2015, 08:59 PM

Hmm -- so just tires?

Glad it turned out to be a relatively simple fix

oscargarza88 · 03-13-2015, 12:52 AM

Quote:

Originally Posted by Jordo!

Hmm -- so just tires?

Glad it turned out to be a relatively simple fix

Not quite. I'm thinking after I re do my alignment it will be back to normal fingers crossed

Big J · 03-16-2015, 07:32 PM

I have the same issues it sounds like with the rear feeling like it wants to go its own direction, esp in rain and on bumps. I got new tires and aligned that helped nothing. I have now bought new rear koni's and that did not help at all either. I'm kinda lost now since i have literally checked everything like 1000 times. Let me know what you come up with and if you decide to go with new shock's I have a basically new set of rear kyb's and rear adjustable koni's i would sell ya.

03-11-2015, 02:38 AM	#6 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 419	Too much toe in the rear. __________________ Enjoy it. Destroy it.

03-12-2015, 12:02 PM	#11 (permalink)
GSS138 Track Member Join Date: Mar 2013 Location: Mission Viejo, CA Posts: 769 Drives: '12 370Z 6M Sport Rep Power: 14	RE 760 Sports? __________________ Current Mods: Vorpal Weapon +5.

03-12-2015, 08:59 PM	#13 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 419	Hmm -- so just tires? Glad it turned out to be a relatively simple fix __________________ Enjoy it. Destroy it.

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03-09-2015, 09:58 PM	#2 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 14,041 Drives: 2013 Nismo 370z Rep Power: 2684393	Rain issues ehh, sounds like you do not have much tread left or the car is what I call, plowing due to the toe being out of whack. It will make it an ill handling piece of crap in the rain. Get a thread depth gauge and read from the inside to the outside of the thread on the rear tires. That will give us all an idea of what may be going on.

03-10-2015, 06:19 PM	#3 (permalink)
oscargarza88 Base Member Join Date: Sep 2014 Location: SATX Posts: 84 Drives: Miata Rep Power: 11	So upon further inspection yes the tires I'm the back are definitely in the Wear bar. So essentially the rear was hydroplaning everywhere... That was scary, and im used to Autox and sliding around but this was different. As far as the alignment. I've heard some people go zero toe In the back. Is this recommended? Also is - 2 camber too much in the back for a dd? Thanks

03-10-2015, 06:26 PM	#5 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 14,041 Drives: 2013 Nismo 370z Rep Power: 2684393	You autoX and the rain bothers you? I love it when it rains. Good wipers and some rainx go a long way. Tires, the less the funner it is, LOL The 370z actually does really well in the rain.

03-11-2015, 10:56 AM	#8 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141521	oscar- u need new tires. you're down to the wear bars.

03-11-2015, 11:09 PM	#10 (permalink)
oscargarza88 Base Member Join Date: Sep 2014 Location: SATX Posts: 84 Drives: Miata Rep Power: 11	good news! new tires in the back! The fronts still look good so im going to hold off for a while. Still have an alignment due, didnt have time to do it today. Once i got home after a couple hard corners i realized im at lease 1+ inches from the sidewall so as you guys confirmed way too much camber in the back. Came to the conclusion of -1.4 camber in the rear with -.03 and go from there. Seems good but will not know for sure until it rains again. Until further notice thanks for all the feedback and will report back once i can get a alignment again. Thanks!

03-16-2015, 07:32 PM	#15 (permalink)
Big J Track Member Join Date: Jun 2010 Location: Memphis Posts: 905 Drives: 370z Rep Power: 16	I have the same issues it sounds like with the rear feeling like it wants to go its own direction, esp in rain and on bumps. I got new tires and aligned that helped nothing. I have now bought new rear koni's and that did not help at all either. I'm kinda lost now since i have literally checked everything like 1000 times. Let me know what you come up with and if you decide to go with new shock's I have a basically new set of rear kyb's and rear adjustable koni's i would sell ya.