punkrawker wrote:well I am just trying to explore my options, I am NOT looking to make this into a 1/4 mile killer by any stretch, just looking for anything to to end shifting between 3-4-5 just to make some hills on hiways. I have been reading alot about the powershot 2000 system and from what I keep reading, guys with turbos on their d456 engine who have added this system on their delica love this mod. one guy put this system on his over 3 years ago and its still running flawlessly on the same engine, no rebuild etc. If you have it dialed down low, then you are just pretty much burning up the rest of the unburnt diesel, engine runs cooler, better mpg and obviously increase in squirrel power....they all pretty much seem to say the same thing....DO NOT crank up the boost unless you have a spare 4d56 laying around and/or you really like rebuilding heads....so far I don't fall into either category. the previous owner on my delica did pretty much F.A for up keep. I have done an oil change, replace fuel filter and air filter, she revs better, seems to get better mpg and way less smoke unless I have the pedal down. so I am going over the engine and replacing what needs to be done to end leaks and get overall better performance and longevity out of the delica.
I should add, a lot of the stuff you read about propane fumigation just isn't true. For example, that the propane is a "catalyst" and it burns more diesel.
Not true. In no way is propane a catalyst in a Diesel engine. A catalyst is a specific chemical that assists a chemical reaction, and propane does NOT do this despite what people say.
What propane DOES do is burn with transparent exhaust. So, if you add extra propane to your engine, you are, in effect adding more fuel. That is pretty good. But what people see as the advantage is no black smoke out the tailpipe. This isn't because it burns the diesel better. (A properly running diesel is amazingly efficient with fuel, in the order of 99.9% of the diesel burns) this is because under hard acceleration, boost (air) lags behind demand, and some of the diesel does not burn. Propane will not help this at all - the problem is a lack of air, not a lack of fuel. But, propane is transparent, so with the added fuel, if it goes out the tailpipe burned or unburned you don't see black smoke because it REPLACES some of the diesel for a given load on the engine.
You can adjust fumigation to get you more power. This DOES work - as long as you have enough extra air to burn all the fuel (propane and diesel) in the engine. However, regardless of what extra fuel you add to the engine, as you increase power, beyond a certain point you will cause damage to your engine.
Given engineering rules of thumb there is a 10-20% margin of overhead your engine can probably handle. Run too close to that unknown edge though, and parts start to break.
In the case of fumigation, you are better off using it for fuel savings costs than for a total power gain, especially in light of your engine model.
