(1) You know what? I do not have a working curve for that. I do believe there is an optimum HHO injection as too little will not burn out all the unburned heavy fuel molecules and too much will cause engine work too hard to maintain the high current deeded by the electrolysis. I wish someone could establish a working curve for 3L, 5L, 10L, 15L engines.

(2) How many liters/minute of HHO is too much? I tend to measure that using the operating current in amps. For our Sprinter with a 2.7L engine, I run the HHO generator usually at 10A at cold when starting. When the solution is hot (e.g. 50 degrees Celsius), the current may be 15A. I would say 20A might be too much for a 2.7L engine. If the engine size is 15L, 40A might be too much.

(3) Fooling around with sensors? I have not done it on Sprinter as I could get good results without doing that. If you plan to do it, find one O2 sensor (yes, just one). Looking from below, there is a large heat shield on the passenger’s side. The wire harness clipped to that goes to the O2 sensor. You can see it from the top if you remove the heat shield – here is a picture of O2 sensor wrapped with Al foil:

Another sensor is the Mass Air Flow (MAF) sensor – I am sure you can find that. Here is a picture showing how I injected HHO right after the MAF:

You will definitely save fuel if (1) no additional fuel being consumed as a result of HHO injection due to wrong ECU response and (2) the percentage of unburned in the exhaust is significantly reduced as supported by air emission testing result. Read my recent post on this:

http://autofuelsaving.com/info/crucial-test-if-hho-generators-indeed-save-fuel

The only difference was, the Shell station in Nisku that I always use, ran out of diesel! And several fuel stations around there had the same problem. Eventually I found the Canadian Tire fuel station had diesel! Canadian Tire has two kinds of diesel: regular and green (higher grade). I picked the regular. The shell station always has one kind of diesel.

I expected to see a lower fuel consumption result but in fact I got the same result as last time. Don’t know if this made the difference.

Anyway, I feel I need to find a way to lean out the fuel injection – I have not received the HydroxyTech’s kit which includes a VMU. The EFIE sold here does not work well with the wideband O2 sensor on Sprinter. Hope the VMU would make it easier to lean out the fuel.

With the new air induction hose replacing the old one, driving from Calgary to Edmonton (Nisku to be more exact which has a Shell station just off the highway #2) for 290 KMs consumed 26.9 liters of diesel. This is 9.3 L/100KM which is the best fuel consumption ever recorded.

This proves that replacing the old air induction hose with a new one does help with the problem of air leaking that was detected on September 23 and 24.

Will report the return trip result when I get back to Calgary tomorrow.

See links:
http://forums.tdiclub.com/showthread.php?t=12165&highlight=evry+mod
and
http://www.clubclio.com/public/foro/viewtopic.php?t=7456&postdays=0&postorder=asc&highlight=potenciar&start=15 (in spanish for common rail)

My idea is, that may be used for reducing the diesel injected. (Is only theory, no probed).

I think about that additional ECU before changing this parameter.

Technical guide: http://www.dieselpowertuning.co.uk/files/dpt_technical_guide.pdf