Now that is badass. Any more pics or specs on the sled?? Iv'e seen plenty of turbo and nos sleds for the mountains but this is new to me..

 

GM has been building CNG trucks for years. Mostly sold to the government. Looks like Dodge is getting into it too. New Ram 2500 Heavy Duty CNG Engineered In-House - WOT on Motor Trend

The tanks are always in the beds, with a cover over them.

GM Will Offer Alternative Fuel HD Pickup Trucks | U.S. News Best Cars

 

I've spent hours and hours studying the safety aspects of propane, I lose no sleep over it whatsoever. There's plenty of info on the internet about it, truck bed installation is by far the most common in pick-up's.

The factory pcm is there, just doing a whole lot less than it ever used to now that the carb takes care of the fueling. I deleted a few lbs of wiring and all of the emissions equipment and I'd bet it still puts out less pollutants. It still handles spark/trans/speedo etc functions. Fuel adjustments are made with 1 allen wrench, an idle circuit screw and main circuit screw. Cruise is well above stoich so it gets great economy, I have had it idling baby smooth at under 300 rpm at times but 400 rpm cold and 700 rpm warm is where it's at now.

The turbo propane 2 stroke mountain sled was a kit I installed that got me started on this whole idea, I wanted to use it all the time but it was somewhat limited to mountain use and I live in wisconsin... Here is a vid and some photos of that,

 

How much boost is your truck running? I thought the impco 425 could only feed around 300hp so once i was looking at 2 of everything i kinda gave up on the idea...

 

That sled is badass man. That's amazing!

 

I questioned the size of the carb too, figured I would just push it until I found the limits and redesign if I needed to. I thought the turbo a/r was too small and now I realize that I had been running this whole time with a loose manifold, of the 6 studs and nuts that hold it to the head 2 nuts were missing and the rest loosened up to almost finger tight! It wasn't restrictive and pushing the wastegate open, it was leaking like crazy! I had been running boost in the teens but it was not consistent at all. I tightened it up and we're making clean boost again, now I am really curious to see what kind of numbers I can put up!

 

This is very cool!! Kudos for doing it and doing all the leg work for making it happen. That vid of the in-cab pull looks like it pulls real hard!!

 

And if that was when the manifold was loose, I can only imagine it will pull even harder now!

 

Interesting...

 

What's your economy on propane? Is it less than E-85? Somewhere around 10-12mpg? Love how outside the box this is, great job!