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So well finally the laser thermometer thing arrived and I figured a 3-4 hour trip would stop any conducted heat loss and give me a very top exhaust temperature to work with.
Towards the end of the trip I had to drive with the brakes on high to keep the ice revs up. I jumped out the car and would say there were only 5-10 seconds after the engine stopped. The cat went down a degree every couple of seconds
Fair to say my car is ALWAYS in open loop. Bad news for future generations smog but I can make my exhaust from even softer aluminium's although 6061 will do. Was really surprised although that was an outside figure after a 180 mile trip. The engine only ticks over most days
..the 39c part was the titanium centre section and the parts in 70's were after that ??
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