GEARBOXES T5

[Lawsy]

The gearbox does not know whether the rear wheels are spinning on the road, on a dyno or spinning with the road (driving), it only understands the force that is being applied and it is force over time that kills metal (Fatigue).

If the wheels are spinning effortlessly on the road surface (burnout) there is not a great deal of force travelling into back into the gearbox, remember energy can not be created nor destroyed only transferred. The biggest strain put through a gear box caused by a burnout is when the wheels struggle to spin and start to gain traction.

I conclude that traction is what is killing the T5s. 

He is spot on you know. The other killer when doing burnouts, or simply launching hard full stop, is taking up the slack in the gearbox.

When the car isn't in motion, there is a certain amount of slack in the box itself (not that much in most cases, but the t5 has a little more slack in it than most other gearboxes). When you side step the clutch, you are taking up that slack with the full force of the engine. So, because there is about, oh, 1 or 2 degree's of slack in the box, the input shaft has this small gap to accelerate before making full contact with that particular gear. Obviously it wouldn't seem like much at first, but when you consider that you are trying to instantly transfere 400+nm allong a shaft, a few degree's makes a fair bit of difference...

Hope that helps someone, somewhere...

[XR6ISM]

The gearbox does not know whether the rear wheels are spinning on the road, on a dyno or spinning with the road (driving), it only understands the force that is being applied and it is force over time that kills metal (Fatigue).

If the wheels are spinning effortlessly on the road surface (burnout) there is not a great deal of force travelling into back into the gearbox, remember energy can not be created nor destroyed only transferred. The biggest strain put through a gear box caused by a burnout is when the wheels struggle to spin and start to gain traction.

I conclude that traction is what is killing the T5s. 

<{POST_SNAPBACK}>

He is spot on you know. The other killer when doing burnouts, or simply launching hard full stop, is taking up the slack in the gearbox.

When the car isn't in motion, there is a certain amount of slack in the box itself (not that much in most cases, but the t5 has a little more slack in it than most other gearboxes). When you side step the clutch, you are taking up that slack with the full force of the engine. So, because there is about, oh, 1 or 2 degree's of slack in the box, the input shaft has this small gap to accelerate before making full contact with that particular gear. Obviously it wouldn't seem like much at first, but when you consider that you are trying to instantly transfere 400+nm allong a shaft, a few degree's makes a fair bit of difference...

Hope that helps someone, somewhere...

<{POST_SNAPBACK}>

Agreed, hence my comment on slipping the clutch, take pressure off the gearbox and put it on the clutch......it would be cheaper to replace the clutch then the box!