torque steer
#1
torque steer
Hoping to bounce some ideas off you guys. My mx5 based kit car is exhibiting what I can only describe as torque steer although obviously from the rear end.
When I get on the throttle the car steers to the right and when I lift off it steers to the left. Not by a huge amount but enough to upset things when your pushing hard.
First question is this normal ie. do I need to just learn to live with it?
As for my rear end setup I have mx5/miata hub carriers with stock rubber bush (Could the flexiness of the well used stock bush be causing this?).
Wish bones and rest of the suspension are specific to my car (bushes are poly and not worn though).
Driveshafts (halfshafts) are custom and 40mm different in length which may cause a bit of torque steer but are much thicker than stock so I doubt that's the cause.
Diff centre is ashcroft - helical style much like torsen (is there any way a helical could end up driving one side more then the other?).
Power is 225bhp.
Camber -2 degrees
Toe in 5 degrees (not adjustable unfortunately)
167 kg on left wheel and 190kg on right wheel with me in there.
Suggestions much appreciated.
When I get on the throttle the car steers to the right and when I lift off it steers to the left. Not by a huge amount but enough to upset things when your pushing hard.
First question is this normal ie. do I need to just learn to live with it?
As for my rear end setup I have mx5/miata hub carriers with stock rubber bush (Could the flexiness of the well used stock bush be causing this?).
Wish bones and rest of the suspension are specific to my car (bushes are poly and not worn though).
Driveshafts (halfshafts) are custom and 40mm different in length which may cause a bit of torque steer but are much thicker than stock so I doubt that's the cause.
Diff centre is ashcroft - helical style much like torsen (is there any way a helical could end up driving one side more then the other?).
Power is 225bhp.
Camber -2 degrees
Toe in 5 degrees (not adjustable unfortunately)
167 kg on left wheel and 190kg on right wheel with me in there.
Suggestions much appreciated.
#3
I have had similar on power/off power changes in direction on both my wife's 97 and my dad's 99. The 99 straightened right up when we installed poly bushings to replace the worn rubber bushes. It was clear that the A-arms were moving enough to cause rear toe changes under power. Sounds like you already have poly bushings so this might no be your poblem.
Does it behave any different with a passenger in the car?
Does it behave any different with a passenger in the car?
#5
I have had similar on power/off power changes in direction on both my wife's 97 and my dad's 99. The 99 straightened right up when we installed poly bushings to replace the worn rubber bushes. It was clear that the A-arms were moving enough to cause rear toe changes under power. Sounds like you already have poly bushings so this might no be your poblem.
Does it behave any different with a passenger in the car?
Does it behave any different with a passenger in the car?
Haven't actually tested it with a passenger but that is a good suggestion.
#12
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<p>when i bought my 90, it did this. i did a driveway alignemnt, and it got a little worse. i assumed it was caused by a shitty thrust angle, and i thought i had induced more thrust angle. it did it with 3 differnest sets of tires, no matter what pressure they were at, or if they were equal. i got it professionally aligned, and it fixed it, but i had almost no thrust angle, so who knows.</p>
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