Join Date: Aug 2018
Location: Central Virginia
You realize this is the drivetrain out of a Toyota Celica, right? They're not known for being all that fragile.
That said, biggest sources of engine wear are cold starts and full throttle operation above the torque peak, particularly with an engine not yet at operating temperature. 'Above the torque peak' is a bit fuzzy on a 2ZZ-GE because it has two, depending on which cam you're on. That said, on the low cam it's probably around 4500 and on the high cam probably around 7500 RPM. There does appear to be a relationship between cold engine high cam use and wiping cams, so staying below 4500 is the safe choice until everything is really warm.
The 'no full throttle when cold' rule matters because the ECU goes into open loop and puts more fuel in the engine than will burn efficiently to make maximum power. That extra fuel makes carbon deposits, dilutes oil, etc. As we have a HEGO, the car should go into closed loop quite quickly, which should minimize cylinder bore washdown even when idling.
Clutch wear is caused by a clutch that is neither fully engaged nor fully disengaged (slipping). That's the only time it wears. If you rev match your shifts, it barely wears at all. I've heard of clutch springs having fatigue failures, but never seen one, so I think we can ignore that given that it's a Toyota.
Transmission wear really comes down to just three things: synchronizers, gears, and bearings. Synchros wear with every RPM of difference they have to brake. Again, rev matching is your (synchros') friend. It's true that fewer shifts equals less synchro wear, but bogging a short stroke 1.8L four is bad, and so is spinning it at high RPM at no reason. Gear wear is inversely proportional to lubricant cleanliness and directly proportional to torque transferred. Spending a lot of time at full throttle and torque peak is a reliable way to make the gear teeth wear more, of course this is a challenge on a 1 ton car with 200 HP. That leaves bearings, which generally fatigue fail after a long life, so not generally a concern.
So what's best? Keep the engine above 2000 RPM when moving. Keep it below 4500 when cold. Stay out of full throttle when cold. Shift as necessary to maintain that state. Learn to rev match - it's ridiculously easy with the light flywheel and good throttle response this car has.