Well we were still trying to learn how to drive it so were taking it relatively easy. Driving to Sydney involves the freeway so once on that we were doing 90 - 100 (the average was probably less).
But....Alicia twice reported that the instrument panel lit up red with a warning and everything appeared to shut down. I didn't notice anything but she said it lost power. It never happened during my driving stints so wasn't sure what it was. Anyway when I was looking into the DP chip I rang the supplier and had a bit of a chat. He offered to run it on the dyno at some stage so for peace of mind I rang him. it turned out the truck is too big for the dyno but he suggested he check the DP CHIP install done by the dealer. Today I drove down to Berrima (about 2 hours) and was getting along at around 100km/h with the occasional moment slightly above (not intentional officer....er it is a "rate per hour" you know!) and low and behold I got the red warning and it shut down momentarily. This happened twice.
When I got to Berrima and reported this the distributer opened up the engine bay (ah..so that's where it is!) and immediately identified that the dealer had set the chip at its maximum output. These chips have 3 ranges, each with either a fine gain, medium gain, or course gain adjustment. My one had been set on course gain 2 which was the highest. He suggested the problem was that it was touching on the outside of the engines parameters set by the factory. He likes to stay within those parameters. It is likely that since the vehicle is now loaded (it was just a tray when it was fitted) it is working harder and is close to the area where it is on the edge of its normal operating limits. He advised it should be set at the standard out of the box setting which is best for that motor. He has set it to that and I cant really notice much difference. I can always tweak it up bit by bit when fully loaded using the fine gain if I want but I'll leave it as is for now. He recons it will fix the problem, and that perhaps the dealers mechanics were a little over exuberant! It went well on the way home. I sat on 100km/h, my economy had dropped to 5.6km/l on the way down, it went back up to 5.7 on the way back for a while but I was steaming along so it ended the day at 5.6.
He didn't charge me for his time by the way!
Karl