Excessive torque steer - differential? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Rocketman · 11-10-2020, 03:36 PM

My car seems to have developed excessive torque steer. Moderately aggressive acceleration kicks the rear end to the left (car goes right). Letting off the gas during cruising causes the rear end to go right. Engine is stock. Car is lowered with TRD springs and sway bars and gets a lot of track time.

Could this be a differential issue? Going to change the diff oil to Motul 300LS to see if that helps. (Now using the regular Motul 300.)

DarkPira7e · 11-10-2020, 03:44 PM

What tires are you running? How much air in them? How is your suspension? What size tires? How is your alignment? Diff is probably the least suspicious thing until you've ruled out most everything else.

I get this issue with my winter tires every year

Tcoat · 11-10-2020, 03:58 PM

Have you driven it in the cooler weather before?

RToyo86 · 11-10-2020, 04:19 PM

Quote:

Originally Posted by DarkPira7e

.

I get this issue with my winter tires every year

This is my first season dealing with the skating on the road feel. New rubber isn't as competent

I'm hoping they will feel better when temps drop below freezing.

ZDan · 11-10-2020, 05:32 PM

Check tire pressures. All good, same problem? Swap rear tires left/right and see if the problem persists but in opposite directions. If so, bad tire....

Rocketman · 11-10-2020, 05:36 PM

Hankook RS4 225/45 17@ 36psi. No recent alignment. I have driven the car under most every condition but this problem only crept up recently. No relation to temperature, although (not surprisingly) wet roads exacerbate the condition. The tires are a coupe years old maybe not as soft as new. The funny thing is that I don't notice it on the track except for accelerating out of the pits.

WNDSRFR · 11-10-2020, 05:59 PM

Torque steer?
What do you mean? Torque steer is usually associated with front wheel drive.
Do you mean understeer?
Oversteer?

Summerwolf · 11-10-2020, 07:11 PM

Are you sure your suspension is tight. I've had that happen before on another car and a control arm bolt was loose.

If it isn't the main culprit of tires / tire pressure start to look for marks in the suspension pieces. Then maybe progress to alignment.

Jdmjunkie · 11-10-2020, 07:40 PM

Check to make sure your rear toe arms are tight. Mine were not torqued properly when I got my last alignment done and I was getting excessive toe changes on acceleration and decel.

RZNT4R · 11-12-2020, 06:36 AM

A torsen binds under load, so tires or alignment are more suspect.

Westen86 · 11-12-2020, 11:30 AM

Rear Toe. I had this issue a couple times. Cruising steady, it would be straight, hands off the wheel. If I gave it gas, it would steer left, again, hands off the wheel. The steering wheel would be straight but the car would turn. The proper term is THRUST ANGLE when dealing with a RWD car. My best guess is my issue came from severe wheel hop leaving stop lights in the rain. Im looking forward to getting better toe arms and trailing arm bushings.

Dont use LS oil in the rear diff! Yes, the car has a LS. But there are NO friction clutches. Its just all gears.

Rocketman · 11-12-2020, 07:57 PM

Torque steer = thrust angle(?): Torque from the drive train (accel or decel) pushes the rear end according to right-hand rule - left on accel, right on decel.

Not over/understeer = occurs in straight line.

Western86, et al: Yes I read on line that it could be wear in suspension parts. I am going to have my mechanic check it out. Car has had a lot of track time so would make sense. And thanks for tip on LS oil.

I don't think it is the tires. They are evenly worn - no obvious defects. But I switched ties and haven't driven it since - so we will see.

Thanks to all.

NoHaveMSG · 11-12-2020, 08:56 PM

Broken diff is not outside of the realm of possibility but that is the last tire I would want to run in your current conditions. Hankook doesn't even advise storing them at freezing temperatures let alone driving on them.

Rocketman · 11-13-2020, 09:35 PM

The Hankooks are off, Winter tires on.

11-10-2020, 03:36 PM	#1
Rocketman Junior Member Join Date: Sep 2013 Drives: 2013 Blue FR-S Location: Chicago Posts: 8 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Excessive torque steer - differential? My car seems to have developed excessive torque steer. Moderately aggressive acceleration kicks the rear end to the left (car goes right). Letting off the gas during cruising causes the rear end to go right. Engine is stock. Car is lowered with TRD springs and sway bars and gets a lot of track time. Could this be a differential issue? Going to change the diff oil to Motul 300LS to see if that helps. (Now using the regular Motul 300.)

11-10-2020, 03:58 PM	#3
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,841 Thanks: 61,656 Thanked 108,295 Times in 46,456 Posts Mentioned: 2499 Post(s) Tagged: 50 Thread(s)	Have you driven it in the cooler weather before? __________________ Racecar spelled backwards is Racecar, because Racecar.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Review soon:OS Giken Super Lock Limited Slip Differential + Greddy differential cover	mav1178	Engine, Exhaust, Transmission	5	02-11-2021 02:20 PM
Rear Differential Bushing Bolt Torque Specs?	brillo	Suspension \| Chassis \| Brakes -- Sponsored by 949 Racing	2	11-06-2017 11:36 PM
Anyone else have torque steer while turning right?	babydriver	Suspension \| Chassis \| Brakes -- Sponsored by 949 Racing	35	05-24-2016 09:45 PM
I don't believe that unequal shaft lengths causes torque steer	pushrod	Other Vehicles & General Automotive Discussions	12	01-31-2016 10:32 AM
Enkei 17x8 RPF1 Gold with Hankook Ventus R-S3, Torque Steer?! issue solved	enginrd	Wheels \| Tires \| Spacers \| Hub -- Sponsored by The Tire Rack	1	11-08-2014 02:00 PM

11-10-2020, 03:44 PM	#2
DarkPira7e Rust bucket enthusiast Join Date: Feb 2017 Drives: 2013 Turbo Firestorm FRS Location: Vermont Posts: 4,052 Thanks: 3,307 Thanked 4,202 Times in 2,111 Posts Mentioned: 33 Post(s) Tagged: 0 Thread(s)	What tires are you running? How much air in them? How is your suspension? What size tires? How is your alignment? Diff is probably the least suspicious thing until you've ruled out most everything else. I get this issue with my winter tires every year

11-10-2020, 05:32 PM	#5
ZDan Senior Member Join Date: May 2011 Drives: '23 BRZ Location: Providence, RI Posts: 4,672 Thanks: 1,439 Thanked 4,011 Times in 2,097 Posts Mentioned: 85 Post(s) Tagged: 0 Thread(s)	Check tire pressures. All good, same problem? Swap rear tires left/right and see if the problem persists but in opposite directions. If so, bad tire....

11-10-2020, 05:36 PM	#6
Rocketman Junior Member Join Date: Sep 2013 Drives: 2013 Blue FR-S Location: Chicago Posts: 8 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Hankook RS4 225/45 17@ 36psi. No recent alignment. I have driven the car under most every condition but this problem only crept up recently. No relation to temperature, although (not surprisingly) wet roads exacerbate the condition. The tires are a coupe years old maybe not as soft as new. The funny thing is that I don't notice it on the track except for accelerating out of the pits.

11-10-2020, 05:59 PM	#7
WNDSRFR Senior Member Join Date: Jan 2014 Drives: FR-S,GTI Location: Cocoa, Florida Posts: 1,189 Thanks: 235 Thanked 868 Times in 442 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Torque steer? What do you mean? Torque steer is usually associated with front wheel drive. Do you mean understeer? Oversteer?

11-10-2020, 07:11 PM	#8
Summerwolf Panda Trueno Join Date: Jan 2015 Drives: No twin now. Location: North Indiana Posts: 3,349 Thanks: 2,113 Thanked 2,409 Times in 1,332 Posts Mentioned: 17 Post(s) Tagged: 2 Thread(s)	Are you sure your suspension is tight. I've had that happen before on another car and a control arm bolt was loose. If it isn't the main culprit of tires / tire pressure start to look for marks in the suspension pieces. Then maybe progress to alignment.

11-10-2020, 07:40 PM	#9
Jdmjunkie Senior Member Join Date: Apr 2017 Drives: Scion FR-S 10 Series Location: Las Vegas, Nev. Posts: 341 Thanks: 1,840 Thanked 204 Times in 128 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Check to make sure your rear toe arms are tight. Mine were not torqued properly when I got my last alignment done and I was getting excessive toe changes on acceleration and decel.

11-12-2020, 06:36 AM	#10
RZNT4R Professional Mechanic Join Date: Apr 2010 Drives: 2017 86 6MT Oceanic Location: Quebec, Canada Posts: 789 Thanks: 17 Thanked 634 Times in 371 Posts Mentioned: 12 Post(s) Tagged: 0 Thread(s)	A torsen binds under load, so tires or alignment are more suspect.

11-12-2020, 07:57 PM	#12
Rocketman Junior Member Join Date: Sep 2013 Drives: 2013 Blue FR-S Location: Chicago Posts: 8 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Torque steer = thrust angle(?): Torque from the drive train (accel or decel) pushes the rear end according to right-hand rule - left on accel, right on decel. Not over/understeer = occurs in straight line. Western86, et al: Yes I read on line that it could be wear in suspension parts. I am going to have my mechanic check it out. Car has had a lot of track time so would make sense. And thanks for tip on LS oil. I don't think it is the tires. They are evenly worn - no obvious defects. But I switched ties and haven't driven it since - so we will see. Thanks to all.

11-13-2020, 09:35 PM	#14
Rocketman Junior Member Join Date: Sep 2013 Drives: 2013 Blue FR-S Location: Chicago Posts: 8 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	The Hankooks are off, Winter tires on.

User Name		Remember Me?
Password