In my fairly well setup SM wrx, this is what would happen -

1. Turn wheels all the way to the left and floor it in 1st gear during dry weather
2. Turn wheels all the way to the left and floor it in 1st gear during wet weather

The car would start to turn, but as speed increased it would understeer. Understeer would happen quicker on a wet surface. With R tires mounted (and -2.8 front camber), I could wind out 1st gear (36mph) and still not understeer. I have my favorite parking lot in which I do this all the time, both with street tires and R tires.

3. Making a Left turn at a light (90 degree) and flooring it in 1st gear half way through the turn in dry weather
4. Making a Left turn at a light (90 degree) and flooring it in 1st gear half way through the turn in wet weather

In dry conditions, my car would seriously oversteer doing this. In wet conditions, you'd need to come off the throttle *very* quick to avoid spinning out of control. Halfway around the corner assumes I'm 3500-ish rpm in first, so if I mash the throttle, I'm pushing 18psi in less than a second.

5. Driving at around 40MPH and then quickly turn the steering wheel about 180 degrees in dry weather

My front end tucks in nicely and I can make the corner no problem. Remember, the key is to be smooth. You can smoothly turn the steering wheel while still being quick, but if you jerk the wheel, you're much more likely to lose traction.

6. Driving at around 40MPH and then quickly turn the steering wheel about 180 degrees in wet weather.

40mph might be pushing my traction limits in street tires... It would depend on the corner banking, exactly how quick I turned the wheel, etc... but I'd probably plow.

 

In most of the examples you gave, the WRX will initially understeer. Once the boost builds and the rear diff starts to work, a significant amount of power will transfer to the outside rear wheel, resulting in slight but controlled oversteer. You might even get a four-wheel drift if the speed is high enough.

If you start turning before you start accelerating, you will usually avoid the initial understeer and go straight to an oversteer/drift position. However, if you are already on the throttle, and then turn, you are likely to first encounter understeer.

In wet/snow/icy conditions, everything will be exaggerated. More initial understeer, more eventual oversteer, etc. In wet conditions, the throttle position and the build up of boost will become even more important in determining the point at which the car switches from understeer to oversteer/drift.

Now, if you want to induce oversteer without the initial understeer, you are going to have to trail-brake (slight application of the brake) as you enter the corner. At the very least, you will have to be off the accelerator when cornering.

One of the best ways to understand your car's responses to such situations is to try an Autocross event. Alternatively, you can find yourself an empty parking lot an try a lot of different things.

Try this link to SCCA's Autocross information. (SOLOII is the SCCA brand-name for Autocross).

http://scca.org/amateur/solo2/index.html