Who makes the best Propane system for the Duramax?


What options do we have for the tank mounting? I would like to have it under the truck if at all possible. ( Don't want to give up too much bed space)


Anyone have pictures??

how about using propane just to increase mileage by using it as an extra fuel? I already have a corncopia of power from my edge ***!

ive been looking into this lately for towing purposes and mileage only, not really for the power, and it looks like the powershot 2000 is a prety good set up, with controllable options on when it starts running and how much it flows - lots of mounting options as well depending on how big of a tank you want, i think with 8lb or under you can mount under neath on rails, over that has to be somewhere else

Powershot 2000 is the boy. Great set up. The 8 gal set up fits up under the back of the bed or up under by the exhaust in the frame rails mid ship if you do it carfully. I have been running mine for 2 years now flawlessly.

i used the bully dog ajustable shot with an 8 gallon tanks and stuck it right in the tool box.a very nice easy to install system....

From my experience, if you want to increase mileage with LP, you will burn enough of it that a small tank will not last long enough. I did a round trip to Dallas last month and used about 70 gal.

If you want a pic of my setup, email me and I'll send it to you. My pics are too large to post here.

You use a lot of propane because your system is not variable, it is simply flowing on or off.


Depending on your threshold starting time, you are burning propane at a maximum flow rate all the time. While flow may vary slightly, it is nothing like a true variable system for driveability and to realize mileage gains without using a ton of propane to do it.

ps1 and marc,
who makes the variable setup? what about cost and what will it do to a STOCK dmax or to a gasser, like the 5.3? And do costs wash out the efficiency gains vs the constant flow system? lukeEdited by: luke warm

ps1 and marc,
who makes the variable setup? what about cost and what will it do to a STOCK dmax or to a gasser, like the 5.3? And do costs wash out the efficiency gains vs the constant flow system? luke


pm powershotone - he has all your answers

SD - how is that set up when hitting the gas if you have a WOT to pass on the freeway or something - not pulling that is ? thanks, just curious if it interferes at all with the turbo or shifting

You use a lot of propane because your system is not variable, it is simply flowing on or off.


Depending on your threshold starting time, you are burning propane at a maximum flow rate all the time. While flow may vary slightly, it is nothing like a true variable system for driveability and to realize mileage gains without using a ton of propane to do it. My system is indeed variable flow. It used a demand regulator that flows according to the vacuum ahead of the turbo. At idle, it flows virtually none. As load picks up, the turbo draws more and more, which causes the reg to supply more. Before I installed this, I put a vacuum gauge in the intake pipe near the turbo. The gauge reads inches of water column. At idle, I had none. As load increased, it rose until it peaked at 14" W.C. This regulator opens at -1.5", and the more vacuum applied, the more gas supplied. This is the way all of the LP gas rigs work, with the exception that they have to have a mixer to work as a carburetor. I have a ball valve in the line between the reg and the intake, so I can shift the entire fuel curve up and down. The reason I used so much LP on my trip is because I wanted to see how it worked, and I get LP for $1.02/gal, so it saves me money. On a straight gas motor, you lose 20% mileage with LP because it has less btus. You can gain power however because it will tolerate higher compression because of it's octane rating.

Oh yeah, one thing about my simple system is that you don't want LP going in during shifts. The engine defuels on a shift so that the trans doesn't have to shift under much power. If lp is on, the engine spins up during the shift. I either turn it off until I get into 5th, or accelerate slowly. My regulator is the Impco model E, I don't know how much they are new. They are on Ebay used all the time. The only other thing you need is a filterlock, which is a combination solenoid fuel shutoff/filter. I have mine on a toggle switch, it can stay on even at idle.

It works the same as the majority of other systems, although most use the Model J regulator and modify it. And I am sure it works and makes power. While it may vary flow from say 5cfm to 8 cfm, it still flows that amount all at once. That's part of the problem in between shifts. Too much.


A Powershot regulator is built for this use only (patented design toohttp://www.dieselplace.com/forum/smileys/Big Smile.gif )and is operated by boost pressure (which is more consistent than vaccum on a turbo diesel) and starts to flow at say .5cfm at 5 psi boost and by the time it is at 25 psi it is at 5cfm, so it is "multi staged" No worries or thinking while driving, just hit the switch and go.Edited by: powershotone

How does the Powershot turn the fuel off during the shift? I did some calculations on fuel consumption. When I am going 75mph, I am getting around 35 mpg on lp. One gallon of lp yields 270 cubic ft of vapor, so at that speed I am consuming almost 600 cu ft/hr. Seems variable to me, to use none at idle and range that much, and that is without a trailer. I have no idea how much it uses then, I haven't done it yet.

The 8 gal set up usually lasts me about 800-1000 miles used in moderation on the stock setting. I have only moved it from there once and got detonation. So I left it at the stock setting and got great results. I does rev a little (I said a little) between shifts, but my Exteme program revs worse when i'm in the big power mode. All truth being said, I didn't put it on to go 55. The Extreme program, normal shot of propane from a Powershot, and a big hit of N2O will put you in the 700-750 RWHP range. My neighbors ( Ford diesel guy) finger marks are still in the dash from trying to hold on.

i have my powershot 2000 kit still for sale if anyone is interested. Everyone says they are sending money, but nothing has show up yet. email me for specifics.. Everything barley used in mint condition, with 5 gallon Mann d.o.t tank. Fits under truck without hanging below the frame rails like the 8 gallon. Also included is a factory look switch panel, instead of the ugly bracket included inthe kit. Worked great when used with edge hot juice, and tts 120 but i have since changed around my setup.

I run an ATS torque pro 2000 on both my DMAX and my Cummins. I find the system very adjustable and carefree. Great for towing, pulling hills and quick dependable HP increase.

Ghettosled,


Did you try running the PS/2000 with your TTS Extreme? What were the results?


Doug

The Powershot is SO simple, and IMHO safer. I'd much rather have a pure vapor setup than draw liquid and vaporize it.





It will be very easy for me to dyno demo one of these as I can do it with the tank and guts on the floor. Only need to sense boost, route feed line, and activate the lock off solenoid or plumb around it...

The Powershot is SO simple, and IMHO safer. I'd much rather have a pure vapor setup than draw liquid and vaporize it.





It will be very easy for me to dyno demo one of these as I can do it with the tank and guts on the floor. Only need to sense boost, route feed line, and activate the lock off solenoid or plumb around it...








I'd love to see the dyno results on the "Stock" setting.


Do you think my stock Allison would have any problems over the long run with either the power, or the fact that it doesn't defuel between shifts??


Keep in mind This would be the only power adder I'd be using, and I am at 4500 Ft elev. so I am already at a power disadvantage. I tow a 10,000 lb 5'th wheel up long 6% grades regularly.


BTW John Thanks for the great service on the Shocks. They are the best thing I've done to the truck so far!!!