For the OZ crowd contemplating FI'ing their particular Merc (with OR without LPG conversion as some beleve this "negates" the necessary EPA test) & want it 'engineer certified', here's some cold hard facts to consider carefully:
After speaking @ length with a prominent emissions testing site, VIPAR, here in VIC:
If you modify a car significantly. Alter the factory settings that effect the standard emission levels provided by manufacturer, IE: FI, regardless of whether you convert to LPG or not & therefore obtain the installers compliance plate for the engineer, you are still required to do the EPA designated ADR emissions test, prior to being provided with an engineers certificate. This is simply due to not being able to provide the engineer with appropriate vehicle manufacturer's specified emissions specs for the alteration/s (mods), as in an available factory turbo ECU, MAF, sensors etc etc,) for the car you are converting to FI (obviously the particular vehicle model was never manufactured & sold on the market with FI), you must have the emissions test performed to ensure emissions satisfy the particular standard specified by the EPA! This then gets handed to the engineer whereby he gives this part of the certifiaction the 'big tick"! Only if you FI a vehicle that was factory produced in the same model ie: you throw a turbo, ECU etc etc on a 323 Mazda that has a model in the same year sold with factory FI, can you avoid the EPA test.
Sorry for the long=winded right up but I wanted to clear the points up for any Aussie (VIC anyway) forum member who feels the urge to FI their non-turbo modeled car
How stringent the test depends on year of vehicle. Pre-June 88' test is ADR 27C = less stringent requirements to be met. Post June 88' & it is a ADR 3700 test which is harder to pass. Btw, test is $1600 a time. Takes 2 days due to 2 separate tests to pass. 1 in the morning when below certain environmental temp'. This is what makes for an extensive dynotune needed, PRIOR, to make sure AFR's are consistent across rev range or @ least on average when calculated together.
In my case, I therefore need to satisfy the guidelines layed out in the ADR 27C emissions test. obviously due to no original manufacturers specifications being met (there is no specs haha)
So. In a nutshell. As long as the tune meets acceptable emissions levels on all 3 points. It's $1600 you coff up. Also, no matter what ECU you use, factory or stand alone, it still is all in the tune when it comes to EPA acceptance & passing that part of the VASS signature that you have to obtain for registration purposes!
P.S. WORLDWIDE: "HAVE A GREAT CHRISSIE BREAK ALL"