I have had a hx402 on my truck for 15 month's now and have had no problems. I have put some miles towing and city drive. I love it. My truck has no tune. To control the boost I have a GM 3bar sensor and the factory vacuum waste gate. I run 14-15 psi.
On my truck with a 13000 lbs trailer cruising at 65 my engine temp was at 195 to 200. This was with ac on and outside temperature was upper 90s. The egts were around 7-800 and going over mountain passes would hit 1150 before I backed off. I have a remote trans cooler so the trans never got over 190.
I am all for this. I know that there are easier engines to get the power out of but the 6.5 has potential. Has anyone tried main bearing studs with the stock crank? I have just finished school as a diesel tech and one thing that I remember about breaking mains and crankshafts is due to flex. so...
I have a flex light electric pusher that i installed in my truck to help the a/c out. It works great. 12" pusher will fit with the stack in place. Still have the oil cooler and trans-cooler in the same places.
You can always try. I know the gm 3 has a different setup than the 5 because i have compared them before. Also I was taking with bill about the turbos and he told me that the gm 5 was fine to run with the performance tune.
GM still makes a 4L diesel. Just not in this country. That is our wonderful EPA that has done that. This is a link to the Australian Holden (GM) site and the new 2.8 Duramax. http://www.holden.com.au/vehicles/colorado/performance