torque twist

[Fifty]

:D

I realised today that this is happening to my auto TT
give it gas it twists a bit; back off same the other way.
I have checked all bolts tight underneath and all looks well -yes I know some bushes will cause probs
any way my question is ; is torque twist common with the power of a std TT. I dont get instability into corners on bumps or going in a straight line only on power application

Rich

[JustGav]

You would naturally get this anyway on all RWD cars.. The propshaft rotates a single way and this will generate a force on the diff causing it resist and hence twisting the chassis slightly...

Whether or not it should be noticeable, can't say I've really noticed to be honest, the NA is powershy so no, and the big supra's I've been in I've been more worried about the road *grin*

FWD drive cars exhibit torque steer due to the power being at the front.

[Fifty]

:D
OK Gav just to say its def linked to harsh power application but hey I just correct, close one eye and hang on lol
Rich

[Chris Wilson]

You mean rear wheel steer, the car veering slightly to one side and back as full power is applied and removed? That's normally due to unequal rear tyre pressures, different rear tyre makes or models or tread depths on the rear, unequal damping forces from the rear dampers ("shock absorbers"), or unequal / wrong rear geo.

[Homer]

You mean rear wheel steer, the car veering slightly to one side and back as full power is applied and removed? That's normally due to unequal rear tyre pressures, different rear tyre makes or models or tread depths on the rear, unequal damping forces from the rear dampers ("shock absorbers"), or unequal / wrong rear geo.

In that case, I need to check the geo! Mine always steps out left when the rear wheels start losing grip.

Could it also be down to the diff? Mark (Pheonix) said mine needed some backlash taking out of it.

[Chris Wilson]

In that case, I need to check the geo! Mine always steps out left when the rear wheels start losing grip.

Could it also be down to the diff? Mark (Pheonix) said mine needed some backlash taking out of it.

Unlikely to be the diff, and backlash in the CWP won't cause it anyway. More likely tyre wear, pressures or unequal toe, for which the car needs stringing up off a true CL to sort it. One reason my geo resets aren't 50 quid ;)

[Homer]

Unlikely to be the diff, and backlash in the CWP won't cause it anyway. More likely tyre wear, pressures or unequal toe, for which the car needs stringing up off a true CL to sort it. One reason my geo resets aren't 50 quid ;)

Thanks Chris, It's not tyre wear or pressures. Over the past few years I've replaced most of the rear end and only ever had basic geo done. Time to get the wallet out! Shame you're so far away.

[Ian C]

If under any sort of acceleration the car pulls in one direction (and always the same direction) and then stops pulling when you lift off, I'd say imbalanced rear tyre pressures every time :)

-Ian

[Homer]

If under any sort of acceleration the car pulls in one direction (and always the same direction) and then stops pulling when you lift off, I'd say imbalanced rear tyre pressures every time :)

-Ian

For my example I tried that. Dropped the pressure on the left by 6 psi compared to the right and it still slipped left, but left the car very unbalanced on cornering. It isn't tyre pressures, nor tyre wear on my car.

It's a worthwhile check though fifty :)

[Fifty]

You mean rear wheel steer, the car veering slightly to one side and back as full power is applied and removed? That's normally due to unequal rear tyre pressures, different rear tyre makes or models or tread depths on the rear, unequal damping forces from the rear dampers ("shock absorbers"), or unequal / wrong rear geo.

aha this man is clever:p

I have a new rear tyre on one side one with 4000 miles on the other - bollox looks like Ill have to buy another one or OK to leave?
Rich

[Chris Wilson]

If it's not pulling it should be OK, *UNLESS* you have a plate type LSD, in which case unequally worn (different diameter) rear tyres will heat the thing up insanely and generally wear it out. Torsen types (stock) are a lot more forgiving, hence why they are used in production road cars so much. Same with many 4WD cars, you need matched tyre sizes, diameter wise, with similar wear, all round.

[Fifty]

:D

has got TorsenLSD but Im going to buy another tyre when I get back off hols before the new one wears too much-thx for the info

Rich

[Peter10654]

Sorry to bring back this old thread, but I have the same problem.

@Fifty

Was the tyre the problem ??

[Fifty]

:d

sorry for late reply Peter

Problem went away -- tyre pressure was out by 4 lbs; still have nt bought the new tyre but Im sure it is down to tyres and not suspension/geometry in my case.
Rich