Homemade ,
I've used a wheel since early 2002. I have Logitech Wingman FF GP, original MOMO and now DFPro. MOMO doesn't work with GT4 and at first I used Wingman for a few weeks, but I didn't like it. After I got DFPro the game got much better because it's clearly made for that 900 degrees wheel. 180 degrees wheel produce too much horizontal G forces at Sarthe straight with the fast cars.
I'm clearly slower if I use DS2 pad, but I still did some license tests (for example the pace car test at Costa di Amalfi) to gold with the pad when I didn't have the wheel with me during the Easter holidays.
I think you should brake early, but not always to 100%. Try to use only about 50% of the brake indicator and for a short period of time. Also if braking hard before a slow curve lift the brake in the end because the car seems to slow down better that way. Also it's possible to steer if you won't stand on the brake (100% braking). I know that with the pad it's not so easy to do because the movement of the button is so short (or if you use the right side stick).
If you've watched my run you can see that I was too late on the brakes at some places. A good example of poor timing is at Karussell where the car goes to the outer side of the curve and I have to do some extra work to get it back to the line. I watched too long time the car in front and missed the braking point.
At Planzgarten after I overtook the third AI car (almost bumped to the rear of it) I used both the brake and the gas at the same time. I don't know how the game handles that input, but I tried to take the car under my control. That can be done if you brake a little and don't lift the gas totally.
If you have enough credits in the game then buy the car and also one step harder sports tires to it. Keep ASM and TCS on (maybe TCS set to 2). Then go to Free Run and just do several laps there. Try to find concistency on your lap times. You should be able to do at least three laps which times are within 1 second.
With the default tires I could get flying laps to 7:01 - 7:02 and with the harder tires they were maybe 2 or 3 seconds slower. I think you should be able to get 7:04 flying laps to be sure. If you can do such flying laps then you don't have to push yourself over the limit in the mission. You just have to know what to do. It's not a question of being lucky.
When I did the flying laps I usually had to do three or four warm up laps which were about 5 seconds slower and after that I got the pace close to what I wanted.
You don't have to be on the edge to be clean (I assume "clean" = two wheels on the track). At least not all the time. I think being "safe" might be about 1 second slower than being on the edge. There were three places where I was on the edge:
- Schwedenkreuz (slight left bend before Aremburg right curve) where the car went too close to the inside
- Miss-Hit-Miss where I was a little too late on the brakes
- Karussell too late on the brakes
Just about everywhere else I had a feeling that the car was in my hands and I knew how to handle the next curve.
AI cars may cause some problems because they aren't in the same place all the time when you overtake them. For example I had to decide in a second how to handle the first AI car when I passed it at Bergwerk. I had passed it earlier just before the curve during braking and after the curve, but never before in the curve.
Here is a satellite picture of the Ring so that you can follow the names of the curves.