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Egts got to hot basically, I had spent all day sitting at 130 on the freeways, then when I hit the 140 zone I figured it had a little more left in it. was slowing down on a large climb, by me backing off the throttle, but apparently not quick enough. Ill put an egt gauge in next time and get a new tune. the last tune was clearly a bit hot.nah those are custom swirl pistons. they trap some air between the cylinder wall and the top of the piston to make the engine run cooler and get better gas mileage.
how did it get like that? leaky injector?
it cruises at 130c?! (266f) are you climbing mountains constantly? is something else wrong with the cooling system? i have some diesels, mildly tuned, and they never get past 110°c before I slow down. they cruise at 75mph (120kph) all day and rarely get above 100c just at a steady speed on mostly flat ground. all 3 of my diesel cars run at the same temperature.