I have some good video to upload, I went about 1.5 seconds faster this year than last in the RX8. I have it fairly well figured out, but I would also talk to Keith who is fast there. I've given long explanations for MSRH before, but keeping it simple...
Turn 1 - 90% of even good drivers and I heard even many of the CART guys practicing there were messing this corner up. You have to aim about 5 yards early of the apex or you won't hit it. Watch all the cars going through, most will be a few yards outside the apex. Turn in early and sharp, then you'll nail the apex by the time you get there.
Turn 2 Carousel - I'm inside at first from Turn 1 exit and then drift out about 3/4ths of track by 30% through and then work back for inside apex on the back side so that for exit of carousel onto straight you are nailing the rumble strips 2 off hanging on for dear life. If you aren't on edge at exit, you didn't go fast enough.
Turn 3 - Even good drivers will wimp out and lift or even brake through here. Higher HP car I could see a little lift to shift weight up for turn-in, but you should be seeing God and on the edge here. About the time I go by 3 I'm on the brakes and engine braking to make 4.
Turn 4 - I give up 4 and am only focused getting a solid run around 5 for the straight.
Turn 5-6-7 - All flat out, the wimps will lift and brake through 7.
Turn 8-9 - Give up 8 to be fast out of 9.
Turn 10-11 - Give up 10 to apex 11 on back side so you can be flat from exit 11 through 12-13-14-15.
Turn 16-17 - Some double apex, I like to give up 16 to get a better run out of 17 for the long straight.
The simple theme for MSR Houston to be fast is only two parts...
Part I - Get some balls and do 3, 7, and 12-15 flat.
Part II - You have to go slow to go fast. Give up 4, 8, 10, and 16 in order to do the next corner better and carry all that speed for the longer section. A turns exit speed is only beneficial until the next braking or slowing corner. Throw out the short chutes and focus on highest exit speed for the loooonnng segments.