I proviso all of the below with the fact I am not ultra quick and I drive with a lot of bad habits. But in the interest of giving you some input, here we go!:
To follow up both Jeremy and
@autech91, I think from watching your lap at Laguna Seca, you're actually slowing for each corner a little too much. As was pointed out above, you're hard on the brakes as you approach a corner, but then often as soon as you turn in for a good number of the corners you're already back on the power, and often almost full power. This would suggest you're actually braking slightly too late or too hard in the initial braking phase, because you're immediately trying to recover speed.
It often doesn't work this way in the actual moment of driving, and I personally actually am not hugely into the GT4 cars, so again, there will be differences, but broadly (and I mean VERY BROADLY, this obviously doesn't apply to every corner), you should be hard on the brakes as you approach a corner in as straight a line as possible. Then, as you slow for the corner and reach your turn in point, you should be coming off the brake, but still having brake pressure applied, but gradually bleeding off as you turn in, continuing until you hit the apex, and once you hit the apex, it's time to start winding the throttle on. As has been said above, ideally you don't want to go back on the throttle until the car is rotated to the point you won't need to come of it again.
If you're uncomfortable trailbraking as heavily, then you should be braking to a speed where you can turn in off the throttle and off the brake, carry the speed into the apex and then back on the throttle once you're past the apex.
Now it's all well and good me typing that out, but the reality is in the moment to moment of dealing with a car's handling, and how it happens to be set up, this broad rule changes. I enjoy driving the front engined GT3 cars for instance, and I do tend to use throttle inputs mid-corner to help rotate the car. So back to my previous point.... the rules apply, until they don't
As another option to what Jeremy has suggested, on youtube, Chris Haye has a video from June this year where he recorded about 30mins of a coaching session of his driving with the Merc GT3 around Barcelona in ACC with Nils Naujoks. Linky
here. You might find watching that gives you some ideas of the approach you should be taking to braking, turn in, throttle application and so on.
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