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Message: [QUOTE="KCTurbos, post: 1351927, member: 13852"] Towing Update: Well I towed heavy for the first time this weekend. I was a little nervous because last time I towed heavy was on one of our original KC68 stage 3 turbos from years ago and it did not tow well. We have changed a lot over the years to make it spool faster, tow better, and run cooler. This time it did GREAT IMO. Here is the info. Truck was fully loaded down with passengers and a full truck bed full of fire wood. I was towing a 28' toy hauler fully loaded down, with gear, atv, fresh water, gas, and the grey/black tanks had not been dumped yet. I did not weigh it but I am guessing around 12,000 lbs. I went up to the mogollon rim with is about 7500-8000 ft in elevation. That is about 2 hours from my house here in mesa/Phoenix which is at 1000ft so it is a pretty good climb the whole way. Still running 205/30 with our newest KC68 stage 3 turbo. I did not have a "tow tune" so I ran my SPD tune with PHP Econo Ficm Tuner. It is still about a 550-600hp tune. I had them lock out OD when the tow/haul button is pressed so I can control my OD better. Flat ground I saw about 800-1000egts I could easily maintain 65-70mph going up even the steepest grades. Egts were about 1000-1250. Truck never even got close to being maxed out. I was usually only at about 40% load and throttle position... Truck always had Tons of power left in her... but egts would go up above 1250 if I used it. I had to keep rpms above 2400 when pulling any sort of grade or my egts would start creeping up, I never saw higher than 1250 because I would just press my tow/haul button and the truck would downshift and cool off. This is what I usually saw going up the steepest grades. egts 1100-1250 boost - 20-25psi ebp - 20-25psi engine load - 40-45% throttle position - 40-45% coolant temp - 220 oil temp - 206 I could easily hit 40psi of boost with more throttle position, but it was just more than I needed to maintain the speed at 65-70mph Not bad for a 68mm turbo and 205cc injectors IMO... while running a 550-600hp tune. On the way back I was a lot lighter after dumping all the firewood/water. I raced a buddy with a stock 6.0 running a "tow tune" and he was pretty embarrassed when I pulled on him. He said it was because he spun his tires. PLEASE NOTE: I do not recommend towing on a race tune... I just wanted to try it and see what happened. [ATTACH=full]162617[/ATTACH] Here is a video of me making the steepest climb at the highest elevation... for anyone who knows the area this is the BIG climb right after Christopher Creek as you climb to the top of the RIM. [url]https://www.youtube.com/watch?v=9qlxXCYQ4-M&feature=em-upload_owner[/url] This is what my truck looked like at WOT with the 12k trailer behind it. I rolled into it at about 15mph and let out at around 65mph because I hit traffic. [url]https://www.youtube.com/watch?v=K8nffxV3wh4[/url] [/QUOTE]