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07-10-2020, 11:32 PM | #1 |
Scooby Newbie
Member#: 411992
Join Date: Jan 2015
Chapter/Region:
Tri-State
Vehicle:2018 WRX STi ISM |
Alignment issue and/or tire issue? 2018 STI
Hi all - have a 2018 STI with the original bridgestone tires (12K on them).
The car pulls slightly to the right when off throttle but as soon as you give throttle, it pulls to the left quite noticeably. I decided to rotate the tires - put the fronts in the rear and the rear in the fronts. Went for a test drive and now the inverse happens - pulls slightly to the left off throttle and to the right under throttle. At first i thought it's a tire issue but thinking alignment is also at play. I checked the tire depth on all 4 tires on different groves and they are all 7/12th. Will schedule an alignment at the dealer but was wondering if anyone had this issue before. Tire pressure is 32/33 psi (factory specs).
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07-11-2020, 02:57 PM | #2 |
Scooby Guru
Member#: 21145
Join Date: Jul 2002
Chapter/Region:
NESIC
Location: Not in my own time
Vehicle:2002 Enemy of Aku |
While the alignment may be at least part of the issue, the rest, if not all of the issue, may be belt separation in the tires.
Why? Because simply rotating tires front to back should not cause an exact opposite reaction. I know there have been tire recalls in the past due to this issue ( belt separation ). Check to see if there have been any tire recalls on your brand/model tire. |
07-12-2020, 12:00 AM | #3 | |
Scooby Newbie
Member#: 411992
Join Date: Jan 2015
Chapter/Region:
Tri-State
Vehicle:2018 WRX STi ISM |
Quote:
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07-12-2020, 08:35 AM | #4 |
Scooby Guru
Member#: 21145
Join Date: Jul 2002
Chapter/Region:
NESIC
Location: Not in my own time
Vehicle:2002 Enemy of Aku |
You can't tell if the belts are separating by looking at them. They are covered by the rubber.
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07-14-2020, 06:50 AM | #5 |
Scooby Newbie
Member#: 516619
Join Date: Jul 2020
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Since the issue changed from right to left and vice versa when you rotated the tyre's, Maybe an issue with wheel balancing? Unless you took the tires off the rims and rotated them?
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07-14-2020, 01:22 PM | #6 |
Scooby Guru
Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:2016 STI |
The only thing I'm wondering is if you just moved rears to the front but didn't change sides?
Or you moved rears to front and switched sides at the same time and just moved the fronts back |
07-15-2020, 07:34 AM | #7 |
Scooby Specialist
Member#: 189077
Join Date: Sep 2008
Chapter/Region:
NESIC
Location: Connecticut
Vehicle:2011 STI limited WRB |
From my experience, a car which pulls in a specific direction on throttle and lets off after is usually do to a loose/failed bushing. In my specific cases it is typically one of the rear control arm bushings (on the front control arms). Now, since your car is a 2018, its really unlikely one of these bushings has failed already, but I would at the very least do a sanity check and get under the car to inspect all of the suspension bushings up front to make sure you do not have any that are worn or loose. Food for thought.
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07-16-2020, 03:12 PM | #8 |
Scooby Newbie
Member#: 411992
Join Date: Jan 2015
Chapter/Region:
Tri-State
Vehicle:2018 WRX STi ISM |
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07-16-2020, 03:13 PM | #9 | |
Scooby Newbie
Member#: 411992
Join Date: Jan 2015
Chapter/Region:
Tri-State
Vehicle:2018 WRX STi ISM |
Quote:
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07-29-2020, 11:23 PM | #10 |
Scooby Newbie
Member#: 411992
Join Date: Jan 2015
Chapter/Region:
Tri-State
Vehicle:2018 WRX STi ISM |
What do you guys think?
That rear left toe isn't very symmetrical with the right rear. Car still pulls in one direction under throttle and opposite direction off throttle but that's not caused by toe. I still think it's a tire issue but according to dealer it's not. https://drive.google.com/file/d/1MyH...ew?usp=sharing |
07-29-2020, 11:39 PM | #11 | |
Scooby Guru
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BAIC
Location: Chiraq
Vehicle:64 Impala |
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07-29-2020, 11:55 PM | #12 | |
Scooby Newbie
Member#: 411992
Join Date: Jan 2015
Chapter/Region:
Tri-State
Vehicle:2018 WRX STi ISM |
Quote:
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08-16-2020, 09:58 PM | #13 |
Scooby Newbie
Member#: 411992
Join Date: Jan 2015
Chapter/Region:
Tri-State
Vehicle:2018 WRX STi ISM |
Ok guys, just wanted to give you all an update. Car was taken to the dealer on 3 separate occasions and realigned a dozen times. Yokohama tires were replaced under warranty, and somehow they adjusted the differential specs per SOA. Car was given back to me and told it's still not 100% and pulls to the right and the steering is cocked to the left. It's so noticeable even at 30 mph and when you get on the hwy it just aggressively veers off to the right - again only under throttle. Off throttle it's fine. So today I decided to put on my "winter" set up which consists of 18 inch sparco wheels and good year f1 all season tires from tire rack. I get on the highway and it tracks straight like an arrow. Absolutely no pull whatsoever. It feels like a new car. I'm at such a loss. So then I put the stock 19s on but this time I swap the fronts with the rears and this time the pull is not as noticeable but again you still need to hold the wheel to the left to drive straight. So idk if it's the stock wheels or if the new tires have a defect. It's been incredibly frustrating.
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08-17-2020, 09:44 AM | #14 |
Scooby Guru
Member#: 21145
Join Date: Jul 2002
Chapter/Region:
NESIC
Location: Not in my own time
Vehicle:2002 Enemy of Aku |
Did you ask the Dealership if the checked the wheels for trueness?
Given your situation, one would think they would have enough sense to do that. Clearly, the issue is with the tires or wheels or both. They should not have released the car knowing they have not resolved the issue or at least returned the car and provided follow-up plans for resolution. I would take it back and tell them to fix it under warranty. Question: Have you had any hard impacts to any of the wheels? |
08-17-2020, 01:28 PM | #15 | |
Scooby Newbie
Member#: 411992
Join Date: Jan 2015
Chapter/Region:
Tri-State
Vehicle:2018 WRX STi ISM |
Quote:
Thanks - will call them up today. No hard impacts on these wheels. |
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08-17-2020, 02:22 PM | #16 |
Scooby Newbie
Member#: 278626
Join Date: Apr 2011
Chapter/Region:
South East
Location: Raleigh, NC
Vehicle:2001 S2000 |
My bet...it's the wheels. My symtoms were slightly different (throttle amplified the tracking condition but it was still present regardless of throttle position). My car was realigned 6 times, and the wheels had been previously rotated once as part of the first Subaru tech escalation.
This last time, I engaged Subaru corporate first before going back into the dealer. They carried out a more in-depth assessment with Subaru's assistance and determined that the wheels were out of spec, and they could not get the amount of unbalanced road force below 50lbs. They realigned one final time (with better attention to detail to get the steering wheel straight) and replaced the wheels and tires. That fixed my issue 100%. |
08-17-2020, 10:19 PM | #17 |
Scooby Newbie
Member#: 411992
Join Date: Jan 2015
Chapter/Region:
Tri-State
Vehicle:2018 WRX STi ISM |
Thanks for sharing. Glad your issue was resolved.
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