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Typically this type of damage is caused when the insert keys under the shift sliders break. When the insert keys break, they pop out and get caught between the gears causing the gears to be forced apart and have less contact. When the gears are spread apart under load, the lesser gear contact tends to chip or strip the gear, the hard gear pieces breaking off tend to continue self destruction.
What normally causes the inserts to break is the driver, rushing shifts, not releasing the clutch soon enough, engaging the clutch too soon, basically asking the syncro to do too much work. When down shifting at high speed, you’re asking the Trans input shaft to speed up, if you double clutch and rev match, you increase the Trans shaft speed and put less load/stress on the shift mechanism. On the track, the difference of smooth, fluid, proper driving technique, will make a HUGE difference on the stress the parts see, also smooth is faster.
Driving a car on the street, getting on the throttle every now and then for a short burst is very forgiving.
Don’s friend trailers his car and road races it at full tilt, this type of environment is extremely hard on the whole car, the heat and stress will fatigue parts and you’re going to have failures, especially parts that are still stock when running double the power in an environment the factory parts were not designed for.
When racing, your adrenaline tends to take over, many folks drive more forceful and less fluid, so it is common to make driving mistakes that are hard on parts.
Serious racing on a track with a car that has a lot of power requires many more upgrades than people show up with, it requires monitoring temps of all the equipment, adding required coolers, replacing fluids between sessions, ect, ect……
The more you ask from the car, the more you need to do if you want to extend the life of the parts and reduce failures.
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