A modification post

As it is old search the bay for one. Hirsch stuff was always well made, because it didn't affect Saab=20 warranty. As you are out of Warranty, it isn't such an issue for you,=20 but you could then fit the black Saab badges.

--=20 Carl Robson Audio stream:

The torque steer can be entertaining in the wet. :)

When I have the tuning unit tweaked up, it will leave large, quicker roundabouts in fourth with one wheel spinning away the power, usually the inside wheel.

What torque steer? The classic 900 had equal length driveshafts and double wishbones. Torque steer was minimal.

Torque steer isnt caused by drive shaft length, other than in normal steady driving by its mass /torsional strength being different and thats a very tiny effect that only shows when the wheel isnt spinning or starting to do so. And its so minor its doubtful anyone would detect it. Violent torque steer associated with wheelspin is a different animal!

Its caused by a wheel on one side breaking traction either slightly or loads or intermittently. Then the other wheel puts more power and torque to the ground or rather it continues to put the same down..

If steering geometry was perfect and tyres were one tiny point wide and the wheel and drive shaft had zero mass then it still wouldnt "steer" the car but its not. As the left wheel starts to spin the mass of the accelerating wheel and drive shaft/disk absorbs the extra power and rpm increase of engine and everything else. The wheel does not produce as much traction though cause its slipping! The extra energy being wasted as heat.. The other right hand wheel is still gripping and getting as much power as before - at least initially due to the inertia of the now accelerating left one. So it pulls the whole car and tugs the steering wheel left.

Even if the point where the kingpins point of rotation meets the road is in the exact centre line of the tyre (and most are far from it and about a 40mm inboard so as to retain some feel/feedback during normal non spinning use) this still happens because of the tyres width. The roads not flat. Its grip and slippage level varies across the tread width at the limit - more so and with greater leverage on fat modern tyres that dont meet the road at 90 degrees...

Bah, you know too much.

I started doing AutoCAD 3D today at college. Trust me I dont! Head still hurting.

Did they get you making a Toroid?

Hmmm Donuts.

was i the only one sad enough to read all that? burgerman is the kinda guy i'd chat away to down the pub drawing geeky diagrams on beer mats and asking 'why' to every theory :)