Just ran a 2:35.5 at Twin Cities which, like the municipal dump situated next to the track, stinks.
Okay, this is what I have so far:
(Sorry on the bad quality but I'm not sure how else I could be a picture of the track)
T1 - Braking point is no later than the start of the painted guardrails to the right. There's not a lot of grip up top so hug the inside line and keep the car above 70 mph.
T2 & T3 - Let the car drift a little wide at T2 and then let off the throttle to cut in for T3. The key is to have a good angle for a clean exit. Too wide and the car will not turn properly. Too narrow and you'll end up going wide on exit. I suggest leaving it on 3rd until clearing the corner.
T4 - WOT. Stay left for the next corner.
T5 - A blind apex corner. Turn-in is around the area between the lights hanging to the left and the start of the rumble strips to the left. The car often understeers and you'll completely miss the apex; however, you can hit the throttle and the rears will spin enough to help you clear the corner without going wide.
T6 - WOT. However, this corner must be taken with very high precision. Slack steering will send you wide and you'll slam the wall on exit. Mess up the line and you'll slam the wall on exit. If you touch the grass at the apex, you'll slam the wall on exit. If you're following someone in the draft, I suggest breathing the throttle for an instant or the car will push and you'll slam the wall on exit.
T7 - WOT. It's not as bad as T6 but be aggressive with the steering to avoid any exit understeer.
T8 - I've seen people go in aggressively into the corner. I do the opposite by braking starting at the black lines on the track and keep braking to get the car to hug the inside of this corner all the way, through. Do not let the car go wide or you'll regret it in the next corner.
T9 - A good T8 means you're set for T9 at WOT or if you want to be careful, go 90% throttle to avoid going wide or in some cases, the rear gets light. If you messed up T8, I suggest keeping the throttle around 80-90% to get the car to a manageable line.
T10 - Another blind apex corner. It's WOT if hit correctly but similar issues occur like with T6. Missing the entry will make the car go wide but this time, you'll be eating grass or otherwise lifting to avoid eating said grass.
T11 & 12 - I'm getting destroyed here. Hugging the left at T11 seems to be the best approach. However, unlike others, I can't hold 4th here. The car just pushes so badly, I'm forced to use 3rd and I scrub off too much speed. I can't seem to hold anything over 80 mph without going wide on exit. I did 83 a few times but I had to tip-toe the car in.
T13 - WOT. Car's speed should be around 100 mph.
T14 - Still experimenting. I've tried both braking early and braking late and neither provides consistency.
T15 - For now, I'm letting the car coast off throttle and aim the car a little wide for T16.
T16 - Just about everyone's using the outside line all the way. I'm the only one that seems to cut into the inside. I brake a little and then slam the car into 2nd and nail the throttle while aiming for the rumble strips to the right. It's probably not as fast but I'm finding that the issue of going wide on the exit is all but resolved.
That's my lap 1 off 
It made me a saaaaad panda
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