Looking at various MAF swap scenarios, its going to run about 3-5 grand unless someone gives me a rare blown manual cali 97 460.
So, until I collect all the parts and tear the engine apart to install the missing timing sensors for MAF, I am looking at running 3 tunes: Stock, Gas (either load or economy), and LPi.
Following in this vein, and reading the Fuel page I notice our common alternate fuels stoichiometric are missing (the efi page is far more specific brand and mix wise though):
- Code: Select all
Fuel Ratio by mass [6] Ratio by volume [7] Percent fuel by mass
Gasoline 14.7 : 1 — 6.8%
Natural gas 17.2 : 1 9.7 : 1 5.8%
Propane (LP) 15.67 : 1 23.9 : 1 6.45%
Ethanol 9 : 1 — 11.1%
Diesel 14.5 : 1 — 6.8%
As that is paraphrased from Wikipedia, I am going to say those are very general averages.
Shown are both average possibilities for LP: 15.67:1 (injection), 23.9:1 (vapor)
My LPi system (common Australian system) should be somewhere near the 15.67 as it does not decompress and allow the propane to warm up, it injects liquid propane. Common North American propane systems warm up and expand the propane into a vapor mist, so I would guess it would be somewhere between 15 and 24 but would likely depend on delivery orifices and delivery line temperatures for expansion.
With a little more research, I am hoping to find enough information to approximate a proper lambse for MAP (seeing that the truck is S/D) as it would currently be using the settings for 1997 era non-ethanol 85/87 pump gas (it is one or the other depending if it the truck was built in the Canada or the USA respectively). IDEALLY I would find a bin from an Aussi 460 as Ford and Vaille worked together pioneering the LPi system in the Australian market, but I am unaware of any 460's going to Australia, so that is wishful thinking.
Any input or commentary is appreciated.