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-   -   Rear-end wanders at speed Help please (http://www.the370z.com/brakes-suspension/101481-rear-end-wanders-speed-help-please.html)

oscargarza88 03-22-2015 12:11 AM

this is what the bolt looked like when i found it. quite loose alright.
http://i.imgur.com/CtoYjLul.jpg

like i said cant explain how that would affect the handling so much but it did something alright.

jchammond 05-10-2015 07:32 AM

I'm currently experiencing my Z dancing around at high speeds/worse on 2 lane roads,,,was never an issue till the alignment set my front and rear toe at 0.
i mentioned this earlier to (Rusty) & he told me that i needed some positive toe...i just haven't had time to take it in....drives perfect under 80-but don't push it hard or it will be squirrelly.
Before alignment shop got it,i adjusted my rear camber myself to straighten out the tires more-to make a few passes at the dragstrip.
drove to track and back (120miles) with no issues,,,blasting up to 130,140 at times.
front toe was 0.22L & 0.08R rear was 0.21L & 0.37R a good bit of + toe in rear....their final setting was front 0.01L & 0.04R rear -0.02L & 0.02R
i'm pretty sure the toe is the problem on mine...any inputs are welcome.
BTW,,,,13.1@105mph 1.955 60' base/touring/auto/2011/stock

Merv 05-10-2015 08:41 AM

Quote:

Originally Posted by oscargarza88 (Post 3145071)
this is what the bolt looked like when i found it. quite loose alright.
http://i.imgur.com/CtoYjLul.jpg

like i said cant explain how that would affect the handling so much but it did something alright.

I would definately give the shop that did your original alignment sh:t. How could they miss that with your car on a hoist getting dialed in! Pure laziness.

Merv 05-10-2015 08:48 AM

Quote:

Originally Posted by jchammond (Post 3193530)
I'm currently experiencing my Z dancing around at high speeds/worse on 2 lane roads,,,was never an issue till the alignment set my front and rear toe at 0.
i mentioned this earlier to (Rusty) & he told me that i needed some positive toe...i just haven't had time to take it in....drives perfect under 80-but don't push it hard or it will be squirrelly.
Before alignment shop got it,i adjusted my rear camber myself to straighten out the tires more-to make a few passes at the dragstrip.
drove to track and back (120miles) with no issues,,,blasting up to 130,140 at times.
front toe was 0.22L & 0.08R rear was 0.21L & 0.37R a good bit of + toe in rear....their final setting was front 0.01L & 0.04R rear -0.02L & 0.02R
i'm pretty sure the toe is the problem on mine...any inputs are welcome.
BTW,,,,13.1@105mph 1.955 60' base/touring/auto/2011/stock

I'm no suspension guru or track junky,so I won't comment on that,but I like those numbers for your 1/4 mile! :tup:

jchammond 05-10-2015 10:20 PM

Had to go underneath to see what was up myself;already adjusted rear camber to more positive before....looked at ecentric bolts for toe & broke out tape measurer.......1/4" wider track width in front of rear wheels compared to backside......marked bolts and took photos of timing marks....loosened & adjusted equal amounts on both sides(tad more on l/r) ending result was 1/8" narrower in front of rear wheels compared to previous 1/4" wider.......test run up to 130...smooth as glass & don't have to hold steering wheel through acceleration...not sure how much positive toe i have in rear...but Z feels like it's old self again..

jchammond 05-27-2015 03:00 AM

~Z~ still handling well,,,but wanted to ck. the front-
0* toe....not what specs call for,,,again i broke out the tape measurer & ck'd...same width on front & rear of Front tires....toe is 0,,,not - as was in the rear.
i see that specs vary,pending on spec sheet....0.02min 0.05max on one alignment sheet(in degrees) 0.05min 0.12 on another spec sheet (dealership) 0.05min 0.11max on (alldata spec) so definitely calls for positive toe on front.
loosened up adjusters & adjusted tie rod ends 1/6th turn outwards on both sides...now i'm showing about 1/8" front to rear....after test drive...Great! felt as if caster increased-as steering snugged a bit & feels even better at high speed straight line runs.
??? why can't these alignment guys know how to do it properly on a ~Z~ ???

jchammond 05-27-2015 03:01 AM

i'm gonna put it on another machine & see where my settings fall...i'll post later.
really enjoy this club & you guy's are Great!

jchammond 05-27-2015 03:17 AM

http://images.tapatalk-cdn.com/15/05...32ebf29af0.jpg now you see why mine was all over the place at high speeds.


Sent from my iPhone using Tapatalk

Jordo! 05-27-2015 05:47 AM

^^^ Yikes!

Yeah, there was waaaaay too much toe dialed in before. You should be fine now :tup:

kenchan 05-27-2015 06:00 PM

those final numbers look like shittt .. i'd get that redone if dat was my car. :icon08: wtf..

was your car in an accident? is that why u need those weird numbers? i mean -0.02 toe on one of the rears? the hell..

Big J 05-27-2015 07:27 PM

I'm not sure if your issues are related to mine but my rear camber arm bushings were shot and caused my rear to feel like driving on ice.

Jordo! 05-27-2015 07:49 PM

Quote:

Originally Posted by kenchan (Post 3210818)
those final numbers look like shittt .. i'd get that redone if dat was my car. :icon08: wtf..

was your car in an accident? is that why u need those weird numbers? i mean -0.02 toe on one of the rears? the hell..

He has a little bit of toe in the front and zero total toe in the rear -- that's fine.

kenchan 05-27-2015 07:56 PM

Quote:

Originally Posted by Jordo! (Post 3210879)
He has a little bit of toe in the front and zero total toe in the rear -- that's fine.

:icon18: hahaha! You so bad. :icon17:

kenchan 05-27-2015 07:57 PM

-0.15 + 0.15 = 0 total toe.

Absolutely fine! :rock:


:rofl2:

jchammond 05-27-2015 11:57 PM

The positive toe in rear came when I adjusted the camber myself,so the rear tires would be more straight up an down.... After I came back from track-I Putin new rear tires & took to alignment shop... Drove fine ( if you drive like little old lady/ not over 60 or so) but blast it up over 120 & hold on--*** end was dancing all over... Even though the paper showed near 0 toe in rear, it was actually negative 1/4"-3/8" on the tape.. Had to adjust a lt to get 1/8" closer in front of rear tires.... Been 140+ since- smooth and straight. 0 toe is not good on a hard straight away blast with a ~Z~

nis350 05-28-2015 12:17 AM

You need to have some toe-in for the rear for straight line stability. I'd set the toe (f & r) near the minimum of the factory range (f +0.03 & r +0.06).

Quote:

Originally Posted by jchammond (Post 3211071)
The positive toe in rear came when I adjusted the camber myself,so the rear tires would be more straight up an down.... After I came back from track-I Putin new rear tires & took to alignment shop... Drove fine ( if you drive like little old lady/ not over 60 or so) but blast it up over 120 & hold on--*** end was dancing all over... Even though the paper showed near 0 toe in rear, it was actually negative 1/4"-3/8" on the tape.. Had to adjust a lt to get 1/8" closer in front of rear tires.... Been 140+ since- smooth and straight. 0 toe is not good on a hard straight away blast with a ~Z~


jchammond 05-28-2015 02:22 AM

I do now/ ckd it this past weekend and it was at 0.(by tape) went under and adjusted equally on both sides 1/6 of turn out on tie tods. Ckd and had 1/8" closer measurements in front of tires than in back.... Drives even better... Gonna put it on another alignment rack soon/ but I'm comfortable driving as is till then...just had to do it the old school way.... I will post final numbers after I have it ckd. But definitely holding a straight line under hard acceleration. Thanx guys for comments.


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