So here's what I have so far in the messed up build. I reflashed the PCM with the dealer IDS and seemed to help. The transmission I think is having a wiring harness issue, sometime works great and other times throws codes at me. Shut it down and start again and sometimes all is good or I get a different code. I got the truck ready for the Purdue dyno loaded a tune and was letting truck idle. When I went back to check on truck a big oil stop was under the engine. I shut the truck down and found the oil pressure sending switch blew the top off. I went to replace and the threads decided to come out with the sensor. So I found a new top section for the oil cooler cover and swapped it out, had to remove intake manifold to get at it. It was about 1:00 am when I was done and driving from Mississippi to Indiana. Got at the event just in time to sign in at number 40 spot and wait. So here's what happen, the truck had a slight miss, but I wanted to dyno anyway. I sat in truck as Chase Fleece ran the truck up, sounded good but I noticed that my fuel pressure was tanking, from 52 psi to 30 psi at half throttle, then at full throttle went to 17 psi. Boost was at 52-55 psi, but I was blowing huge black smoke. I most i could get was 545 rwhp, and we tried one more pull but adjusted the load, and pop the map sensor boost line blew apart. So that was it, I get the truck out in the parking lot and started to look things over, truck still missing, Might have a bad injector.
It was very disappointing and a very long day, the plan I have is to upgrade the fuel system since the system I have now isn't any good. I will be doing a sump, larger pick up tube, Airdog 150, plumbed to a Weldon 2032A high pressure fuel pump, to the regulated return and use a 3/8 braided lines. The fuel system should be good, for whatever I through at it, the Weldon pump flows 210 gallons per hour at 80 psi of pressure, and using the Airdog 150 as a lift pump for the Weldon.
For the injector problem I will be going from 205/150 which nozzles are way to big to 225/75 injectors. Why? I have a theory about nozzle sizes and VGT turbos, I really don't think that the nozzles need to be big, for the VGT to work the best. The VGT turbo have no problem lighting off so keeping fuel nozzles small should atomize the fuel better and keep the truck extremely clean. I know I was not a big fan of the 150% nozzles at all, and I will also be increasing the air flow of the stage 4 turbo, so that is why I will be going up in injector size.
As far as events I may not hit anymore until I get the truck live tuned so I know, all the bugs are worked out and have a solid number from the dyno, and then take it to the track. One more reason for the smaller nozzle size is that I want to max weight tow with the injectors and the stage 4 to see if I can do it. Thanks and will keep you all posted.
