Power loss on hot day (x5d)

[smassey321]

Originally Posted by bfeng

Transmission seemed to be operating fine. Car just lacked power. But-o-meter says it was down 50hp. I was wondering if this was a combo of the ambient heat and not big enough intercooler. I’d forgotten my OBD2 WiFi interface so no data monitoring. Even in winter weather the coolant temp creeps up over 90C on this particular drive when I’m pulling the trailer.

A DPF regen can throw off the but o meter. They always seem to happen when I want to pass someone on a 2 lane road. I just moved to Phoenix and I am surprised how 115 degrees does not affect power that much. But I am hauling air and not towing.