Drilling thermostat

[JET]

Originally Posted by Halon

The car seems fine at lower speeds, and worse at higher speeds. Just letting the car idle or sitting at stop lights lowers the temp.

This means it is not a normal cooling problem. If you just had a lack of cooling, then it would get hot around town. Do you have an EGT guage? This is one of the times that one may come in handy. Is it possible that the DSMlink timing isn't set the same as the engine? Running too much timing will raise the temp, as will running too lean.