Question about 1996 Mazda MPV

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Hho no mpg increase on turbo diesel

I have fitted a good hho system to my 2.5 turbo diesel van no leaks ,good hho production ,pulling 15amps on pwm ,hho goes in 4''from just b4 turbo,but i am getting no increased mpg ,cant make it out ...i have no sensors to deal with either.its a 2.5 td 4x4 automatic mazda bongo friendee.hope someone can help. Flyingdoc.

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Hi I have the same problem I have a 1988 Isuzu 2 tonne truck with a 3.6l turbo diesel. I have dyno'd it twice and picked up 1.5 hp from 80hp to 81.6hp so I have actually noticed the increase in power but no noticeable increase in the fuel economy. What I am wondering is whether the cell I am using is the problem as I have tried from 5 amps through 25 amps in 2.5 amp increments and start to lose economy over 15 amps. I have just fitted a cell to my 2012 toyota corolla 1.8l petrol and filled the tank then drove 120 km and the fuel gauge is still reading above full, so it seems to be working but I will know more when the tank is empty. So I don't know why the diesel ins't working but they do sat 10 to 15% is what you get in gains. So keep trying.

Posted on Sep 09, 2012

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Hi, try to hook up the hho gas hose into a vacuum line of the crank case (with t-connector) NOT directly b4 the turbo. That might help. Its not getting enough vacuum to "pull" the gas from the cell. How much hho production do you get right now? Greetings, ****

Posted on May 04, 2009


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A 1.7 diesel even if turboed, is dead slow in any vehicle let alone a van. Enjoy the fuel economy

good luck

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2 Answers


try some of the Lucas product for diesel engines,
diesels are made for hard work/pulling. not for fuel economy
the best thing you can do is to keep the fuel filter changed as often or sooner than the manual recommends. it will be the heart to a happy diesel

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