2023 MT supra pulling left under WOT

[AJRMKV]

My supra tends to bank left under WOT, sometimes dangerously so. It changes in severity from drifting around the lane to nearly pulling the car out of the lane without correction. This has happened on the smoothest of surfaces at the track and on the road. It's most prevalent in 3rd, 4th and 5th gear.

At first I thought it may be a poor factory alignment issue, so I had it aligned and the problem has not gone away.

Has anyone else experienced this?

Mods: bolt ons, stock tune, H&R springs, spacers. (this happened before and after mods)

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[tomfree]

This has a distinct "something is broken or loose in the front suspension" sound to it. Get the front end of the car up on jackstands and start poking around immediately. Start with the easy stuff (sway bar end links), check every nut and bolt for the control arms, struts, check all the mounting bosses on the unibody - do you have a tear/crack in the unibody?

Another possibility - you have some really wonky tire issue that is showing up -odd wear...which may be a side affect of the "something is broken"

Other thought - a hard impact has thrown your alignment way off, so you have some very funky toe settings. You can do a rudimentary toe check with 2 tape measures and a couple of 2x4s. If you have an front to back toe discrepancy that is more than fractions of an inch...get it on an alignment rack.

 

[razorlab]

You got an alignment but what are the settings?

Still sounds like an alignment. If toe is off in the rear it will do exactly what you are describing.

 

[AJRMKV]

This has a distinct "something is broken or loose in the front suspension" sound to it. Get the front end of the car up on jackstands and start poking around immediately. Start with the easy stuff (sway bar end links), check every nut and bolt for the control arms, struts, check all the mounting bosses on the unibody - do you have a tear/crack in the unibody?

Another possibility - you have some really wonky tire issue that is showing up -odd wear...which may be a side affect of the "something is broken"

Other thought - a hard impact has thrown your alignment way off, so you have some very funky toe settings. You can do a rudimentary toe check with 2 tape measures and a couple of 2x4s. If you have an front to back toe discrepancy that is more than fractions of an inch...get it on an alignment rack.

Thanks for the tips. I'll get it up on the lift this week although I had the car examined during alignment. It's been doing this since day 1(following break in process).

 

[AJRMKV]

You got an alignment but what are the settings?

Still sounds like an alignment. If toe is off in the rear it will do exactly what you are describing.

The top is factory alignment. Bottom is alignment with springs and spacers

 

[razorlab]

The top is factory alignment. Bottom is alignment with springs and spacers

Seems pretty good. What kind of tire pressure are you running front/rear?

 

[robotvoice]

Crazy to see how bad the factory alignments are on these cars. I had to get mine redone because my toe was off from the factory and it made a night and day difference.

 

[AJRMKV]

Seems pretty good. What kind of tire pressure are you running front/rear?

I'd have to check but it's 32-34PSI all round, according to the dealer

 

[alan7467]

The 2021 3.0 I test drove last year pulled like crazy under WOT. In that case to the right. The car appeared to be stock, but I assumed that perhaps wasn’t always the case and the alignment was out of wack, or that something was broken. Car felt perfectly stable the rest of the time.

 

[Joker328]

Crazy to see how bad the factory alignments are on these cars. I had to get mine redone because my toe was off from the factory and it made a night and day difference.

No kidding. Mine wasn't that bad, but that one looks like they set it up to actively try to kill you. I'm surprised fixing the alignment didn't fix the issue.

How long did you have it on the factory alignment? Wonder if the tires are worn in a way that is causing problems even though the alignment has been corrected.

 

[STi_to_GRzupra]

Mine does pull to the left under WOT in 1-2nd. I’m on stock suspension. I thought it was normal ?.

 

[AJRMKV]

No kidding. Mine wasn't that bad, but that one looks like they set it up to actively try to kill you. I'm surprised fixing the alignment didn't fix the issue.

How long did you have it on the factory alignment? Wonder if the tires are worn in a way that is causing problems even though the alignment has been corrected.

Roughly 2000-2500 miles on factory alignment.

 

[AJRMKV]

Update:

Alignment was checked yet again, everything looks good. I've had multiple people drive the car hard and each one of them comes to the same conclusion.

Under WOT the car drifts around the lane in a sketchy way. Does anyone have experience with this?

 

[Evolution]

Check the rear toe arms for play.

 

[Stvee]

On older BMWs that was typically caused by the rear trailing arm bushings (RTABs) being shot. I'm not really sure how similar the supra suspension is in the rear.

It sounds like you have something lose or a bad bushing in the rear suspension somewhere though.

Edit: My 2023 MT does not pull noticeably to either side under hard acceleration

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