Causes and solutions for torque steer

[therealnovaboy]

i was thinking about this again today. i still stand by the twisting of the shaft theory as a contributing factor to torque steer.

i remembered that some nova drive shafts have weights half way along the long drive shaft. i may be wrong but i always thought that these were to try and help reduce torque steer.

i dont know how they are supposed to work but i cant see them having any affect on the forces of the cv trying to straighhten and move. however altho imno mechanical engineer i can see them having more effecton reducing twist in the shaft and. i dont know just a thought.

i also remember reading somewere that a car was made with a hollow shaft and a solid shaft to try to counteract this twisting to reduce the torque steer. again im no expert and could be wrong

[Lee]

i remembered that some nova drive shafts have weights half way along the long drive shaft. i may be wrong but i always thought that these were to try and help reduce torque steer.

i dont know how they are supposed to work but i cant see them having any affect on the forces of the cv trying to straighhten and move. however altho imno mechanical engineer i can see them having more effecton reducing twist in the shaft and. i dont know just a thought.

Thats a balancing weight to reduce vibration

[MK999]

oh and to go on from there,
might have got this bit wrong so feel free to correct.

Assume a nova weighs 900KG and in the super imaginary worls its 50/50 balanced FR/LR so tis 225Kg on each corner.
You have amazing slicks on that have a mu of 0.9

Thats approx 200N of launch grip you have to play with

Going with a 195/45/15 tyre size and the 25mm shaft, putting 100NM down it will give you about 380NM at the point of contact for the tyre.

working backwards that means you can 'only' put about 50NM down the shaft to not break that static friction at launch... which relates to a 0.5degree twist in the shaft. Which lets face it, is nothing.

That could all be a load of toss though


note that in 1st gear you are most likely putting thousands of NM of torque due to the gearbox mutiplying the forces

Slicks have a mu much higher than 1, proper racing slicks go as high as 3. But yes, it's tiny

[therealnovaboy]

thats right its to stop harmonics or somthing.

its got nothing to do with the tyres grip. if you have a long bar with a wheel on the end,in mid air, the bar will twist just with the inertia of trying to rotate a mass. if you imagine a really long bar its easier to imagine.

the twist only has to be a tiny amount more than the short shaft. then the diff takes over and pull the car to the side. like hitting a slidy patch on the road with one wheel, the car pulls to the side that the slidy patch is on.

i was talking to my old man who is an engineer in the deep sea oil and gas industry and knows about metal stresses and strains. he explained that metal can twist then spring back untill it passes its yeild point. this point changes as the length of the bar increases.

[mowgli]

wtf, nerd alert

i know....just snatch at the wheel & keep your right foot down

[Mieran]

I thought I'd update this thread instead of making a new one.

Turned out to be the passenger side wheel bearing, it was knackered.

The car went from having dangerous torque steer to hardly any.

[Dar]

Good to hear. It's usually something moving under load.

[craig green]

Nice one. I bet along the way to sorting it, you rectified other issues you didnt know you had.