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Old 04-03-2014, 07:55 AM   #1
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Horrible Handling

Alright guys I need your help I have a 2011 GT with 15k on it that I bought used it had snow tires on when I purchased it I thought that it was just the snow tires doing this but after the snow finally disappeared I swap the pirellis back on the rear and it has completely factory suspension setup and stock 18" wheels .... now I know the Pirellis are a softer tire compound and will have some tramlining following all the bumps and ruts but that's not the problem the car wants to completely dart over in both directions at higher speeds...now this is my first sports car but I know it cannot be normal I have to constantly correct the steering and white knuckle it going 65+ and it makes me not want to even drive faster than 40....I have had an alignment done and it was in spec I have to search and see if I can find the numbers this is in no way normal and I have no idea where to even start I did jack the car up to see if there was any play in the wheels and it was normal what could be the cause of this its never been wrecked or anything according to my knowledge and kinda hard to feel the road with the electronic steering to tell if it's coming from the front or rear.... anyone have this ?any ideas on where to start before I start throwing money at it or what it could be? All help is appreciated
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Old 04-03-2014, 08:09 AM   #2
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Could be bump steer or lca's or any suspension problems. Go see a good shop.
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Old 04-03-2014, 08:10 AM   #3
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my 14 is pretty sensitive with the electronic steering, but I don't have to white knuckle anything. It drives straight when the wheel is straight. I'd definitely check front end bushings. Sounds like you have worn control arm bushings. Or something bent. I'd check the collision history because an 11 should not do that unless it was under serious track abuse. Also check steering rack bushings. Maybe replace with urethanes. Best of luck. Hate the fact your scared to drive it.
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Old 04-03-2014, 08:21 AM   #4
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Yea it definitely doesn't want to track straight as steering goes it's very responsive but the car has a mind of it's own I can turn the wheel slightly to compensate for a rut or bad patch of road and it will track over then a second later dart over even more in that direction not fun lol... I was was looking into lca's thinking maybe it was the rear causing it to walk over but I'm by no means a suspension tech but I don't want to pay for one quite yet... anybody ever heard of j&m lca's? As far as the collision history it's clean and crawling up under it to change the oil I didn't notice anything in the front that was unusual but never crawled under the rear
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Old 04-03-2014, 08:28 AM   #5
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I will check the steering rack next days off I get an see if I can find something wrong with it and I guess it couldnt hurt to go ahead and buy some lcas if anything do you think a bumpsteer kit would help? I will pay somebody to figure it out if i have to as a last result and if they cant guess ill trade it in for another pony lol
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Old 04-03-2014, 08:34 AM   #6
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I dunno. I have a BBP car with much stiffer tires than the factory 18s on yours. It's stiff sidewall tires than tramiline more than soft ones like yours. It's also got stiffer springs and dampers and I don't have a lot of what you describe, only very rarely on particularly rutted roads and it's nowhere near the uncontrollable state you describe.

How's your inflation pressures? Drop them to 32 and see if that helps. Has the car been lowered in any way? That can wickedly increase tramlining and dartiness on a macstrut car like this.
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Old 04-03-2014, 08:44 AM   #7
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What steering setting do you have it on?
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Old 04-03-2014, 08:47 AM   #8
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It's not a BBP car so the steering isn't adjustable. I would suggest if you had no issues with the snow tires, just junk the garbage P Zero Neros and put a good solid performance tire on there. Good value? BFG Sport Comp 2s. Premium everything, Michelin Pilot Sports.
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Old 04-03-2014, 08:58 AM   #9
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Quote:
Originally Posted by 5LHO View Post
It's not a BBP car so the steering isn't adjustable. I would suggest if you had no issues with the snow tires, just junk the garbage P Zero Neros and put a good solid performance tire on there. Good value? BFG Sport Comp 2s. Premium everything, Michelin Pilot Sports.
Didn't know that as my '14 base has it standard.
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Old 04-03-2014, 09:00 AM   #10
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I had the problem with the snow tires I figured that was the cause because i had a similar issue on my pontiac with the snow tires but not this bad so i wasn't too worried about it on the mustang cause I had the factory pirellis to put back on ...when it warmed up I swapped them over and the problem still continues
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Old 04-03-2014, 09:01 AM   #11
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I've tried running in car in sport mode and it doesn't really change anything it still wants to dart over in both directions
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Old 04-03-2014, 09:09 AM   #12
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Car hasn't been lowered it's all factory except the axle backs... as far as tire pressure ive tried playing around with it but to no avail. I'm leaning towards something either suspension wise or the steering rack because it were a bad belt on a tire or something I believe it would just pull one way not in both directions.
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Old 04-03-2014, 09:54 AM   #13
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So my understanding is that the front tires are still the same, and the problem still exists correct? I am thinking one or both front tires are bad. A shop with a roadforce balance machine will be able to tell you if the tires are good or not.
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Old 04-03-2014, 10:00 AM   #14
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Yea I just have snow tires for the rear that's all swapped out guess I will get them balanced and checked out that's a cheap possible solution but wouldn't guess both tires would be bad still quite a bit of tread on them but I know my luck if I bought a cemetery people would quit dying
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Old 04-03-2014, 10:05 AM   #15
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Originally Posted by r_neck7 View Post
Yea I just have snow tires for the rear that's all swapped out guess I will get them balanced and checked out that's a cheap possible solution but wouldn't guess both tires would be bad still quite a bit of tread on them but I know my luck if I bought a cemetery people would quit dying
Make sure it is a Hunter roadforce machine. It will find hidden defects that can cause handling issues that regular balancing won't.
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605 RWHP on a safe tune
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Old 04-03-2014, 10:10 AM   #16
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Alright I'll have to ask around an see if the tire shops around here have one of those or not
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Old 04-03-2014, 10:14 AM   #17
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Really...if the snows are on rims, just remount them. If the problem persists, the issue isn't tires or balancing.
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Old 04-03-2014, 10:22 AM   #18
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No I haven't got different rims for the snow tires alone I just swapped the rubber on the rear as far as the balancing there isnt a shimmy while driving just a hard pull left or right and even wear on the tread pattern that's why I'm leaning towards suspension or bushings but not quite gonna rule the front tires out yet cause ya never know I've seen stranger stuff
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Old 04-03-2014, 12:04 PM   #19
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This definitely does not sound like a tire issue to me. Like you said though, don't rule it out, but highly unlikely from what I'm gathering. I'm in the Duluth, GA area if you are close I work in a dealership. Got all the equipment we need. Even a Hunter tire machine. I'll check it out for you. PM if you're interested.
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Old 04-03-2014, 12:08 PM   #20
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Horrible Handling

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Originally Posted by r_neck7 View Post
Alright guys I need your help I have a 2011 GT with 15k on it that I bought used it had snow tires on when I purchased it I thought that it was just the snow tires doing this but after the snow finally disappeared I swap the pirellis back on the rear and it has completely factory suspension setup and stock 18" wheels .... now I know the Pirellis are a softer tire compound and will have some tramlining following all the bumps and ruts but that's not the problem the car wants to completely dart over in both directions at higher speeds...now this is my first sports car but I know it cannot be normal I have to constantly correct the steering and white knuckle it going 65+ and it makes me not want to even drive faster than 40....I have had an alignment done and it was in spec I have to search and see if I can find the numbers this is in no way normal and I have no idea where to even start I did jack the car up to see if there was any play in the wheels and it was normal what could be the cause of this its never been wrecked or anything according to my knowledge and kinda hard to feel the road with the electronic steering to tell if it's coming from the front or rear.... anyone have this ?any ideas on where to start before I start throwing money at it or what it could be? All help is appreciated
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Old 04-03-2014, 12:13 PM   #21
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Are you sure the coils aren't cut? I after i dropped my cad i had wicked bump steer and it sounds like exactly what you are going through
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Old 04-03-2014, 01:56 PM   #22
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Move the back wheels to the front and see if the problem remains the same.
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Old 04-03-2014, 08:40 PM   #23
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The coils doesn't look cut to me......they look factory with the large wheel gap haha as far as rotating the front to rear I will have to try that and let ya know if it makes a difference
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Old 04-03-2014, 10:49 PM   #24
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Perhaps the Pirellis have uneven tire wear, that could possibly be causing/worsening the problem.
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Old 04-08-2014, 01:59 PM   #25
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Turns out the two front tires were shot guess I got duds on well BFG comps it will be then
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Old 04-08-2014, 09:08 PM   #26
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I had such an incident long ago : after an accident, the suspension was no mounted correctly and I tried everything until it was finally found. Repairs were done at the dealer !!!
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Old 04-09-2014, 08:40 AM   #27
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Turns out the two front tires were shot guess I got duds on well BFG comps it will be then
Glad to know that the tires were shot like I thought they were
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Old 04-09-2014, 08:31 PM   #28
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Yea I'm glad it was an easy fix myself now I can focus more on performance with that out of the way
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Old 04-19-2014, 05:59 PM   #29
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wow. glad you found the issue.
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Old 04-19-2014, 06:00 PM   #30
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No kidding it's a night and day difference now
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Old 04-27-2014, 05:02 AM   #31
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It should be bad alignment, go to a better shop.
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