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Message: [QUOTE="Drwoodchopper, post: 285336, member: 4720"] I have had a bunch of PM's about my CNG supplemental set up so I thought I would start a new thread about it. First off I did tons of reasearch and came up with a very limited amount of information. CNG supplements the diesel fuel, "streatching it" to make you go farther by supplying an extra, much cheaper fuel. We can't run straight CNG because we do not have a sparkplug...duh. CNG is much safer than propane because it is able to compress much more before ignighting so thus the diesel ignighting creates the fire to ignight the CNG. The gas is drawn under vaccum from the regulator pre-turbo so you are using little to no CNG at idle. The amount of CNG used increases with rpm and boost (ie: vaccum pre turbo). I have been running the system for a year now and have only run out of CNG once so I have been using it all of the time even grossing 18-20k towing. You do have to keep a closer eye on your EGT's but I have only had to reach down and shut it off 2 times that I can remember. I constantly get 800-1200 miles out of a fill up of diesel and 200-280 miles out of 10 galons of CNG. The downside is the tanks are big and because it is a gas they don't hold much, so I have to fill up often. Tuning seems to be a non issue except for trans tuning. The truck has 50-75 more hp with it so the trans does not "know" this. Newer trucks have "adaptive learning" for the trans and this seems to be a non issue. I had Johnathan at Beans tune the trans to behave as if it had more HP than my mods would produce and it has been shifting great ever since! The system is quite simple you have a tank, regulator/controler, coolant lines to kep it from freezing a power wire, a supply hose to the intake, an on/off switch and a control valve to adjust the max amount of CNG to be used. I get asked about it almost everytime I fill up as the CNG fuling station I use is right next to the diesel pumps. I just did a blackstone oil analysis at 7k and they said I should go 10k on next oil..it was that good! Belive me I was very nervous to try it and turn it on the first time but I absolutly LOVE it now!! The inital investment is quite large $3000 is what I spent on mine I looked into having it done and it was $7500-10k:eek: The tanks are what kill you, a new 12 gallon one like I have is $3600!!! Some of you might remember a duramax that smoked the fuel economy part of the diesel power challenge a couple of years ago. That is what peaked my intrest and I am running that same system. For those that have worries about your safety here is a video that should calm your fears. [url]http://www.youtube.com/watch?v=irvktfQvu4M[/url] [/QUOTE]