Depends on the temps man. You wont cook that engine at 280 if your blowing smoke like crazy. I would advise bringing the temps down. That Mad Force engine typically ran around 230 for me. First things first! Make sure you are running a cold glow plug. MC9, or i believe its the OS A5 thats cold as well. Either of those will drop temps drastically, and require retuning. Also what fuel are you running? If you run 20%, expect temps to be high in hot weather. My recommendation for summer running is one of the mentioned cold plugs, and some HIGH quality 30% fuel. Odonnels, or Byrons. If the problem is caused by an air leak, or a worn engine, then none of the above advice will help. If i remember correctly, you are the guy coming to Northville for a while soon. If you need help tuning, gimme a pm. Im about 10 minutes from Northville.