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From your words you have already answered some of the questions , of which I still have many .
One has to ask why the early vehicles had gear shift timing that was adjustable by the driver on the fly .Same principle was used with aircraft - boost and cruise control.
The same principle has been used by some innovators tinkering with vapor and other methods to adjust by fuzzy human logic for efficiency .
The vacuum negative feedback resulted in being able to drive without the driver having to manually adjust - this made sense for demand but lead to the decades of cloak and dagger by manufacturers on how they do things and why.
I have one shortfall in that my vehicle is 1999 /2000 - sold as 2001 but the ECU is a closed shop in terms of people that have truly reverse engineered it . Over and above this the ECU does not spit out mpg in real time so my notes ,recordings and long term notes would not satisfy any scrutiny .
Here is what I think and only my interpretation and limited understanding :
Long term aims to move the industry away from the user ,home experimenter from gaining 100 knowledge of the inner workings of any ECU design .
Having said this going to Fuel injection and then direct injection showed that the industry was in a race to get the beneficial acceleration scores closer to public demand .
Going back to the manual timing and vapor - there is some lag in the sense that good vapor systems that are not pressurized for high speed delivery can have as an inherent part of the system .Slow acceleration and manual air control together with the vapor is key .
Looking at history ,the era when vapor carbs were becoming successful in delivery outstanding mpg figures, the change happened to follow the fuel injection design and OBD world adoption .
As far as mods go I can list them but they are for interest and I will not support any tech results or fugures. All I can say is never ending and ongoing projects .
List of my changes :
Exhaust -replaced original to free flow with Cowley straight through .
Cat delete-
HHO - hho supply to Throttle body intake controlled by manual PWM control . I am using KOH (Potassium Hydroxide as electrolyte)
AFR-On-board addition wide band O2 sensor for monitoring real time driving AFR .
Manifold Pressure gauge- for on-board driver monitoring.
Efie- Manual dual control for manifold offset
Fuel Heat exchange-My own design have not seen before on internet.This innovation is neater than the old school radiator or exhaust copper pipe versions .
PCV delete- Not common on boxer engines - filtered ports.
IAT -Internal air temp -Manual switch and offset adjustment .
Changes used already and to be added in near short term :
Water ultrasonic vaporizer
Fuel vaporizer - new design for heat cracking being made before adding .
One has to ask why vehicles in the early 1900's with such large bodies and weight still had really good efficiency out of the engine as far as BTU per liter of fuel .
Same family vehicle many decades later - third of the weight have same l/100 km consumption but the public are into believing that the efficiency is up high and non the wiser .
People in my country and many others spend a vast quantity of disposable income on cost of fuel to travel to and from work with no public transport to offset the choice .
My testing involved a 97 km round trip to work and back every day for over 10 years .
This was an amazing opportunity to do my testing and achieve some stats on my changes along the way .
Since being retrenched and without work ,my long distance testing has been somewhat limited but this has not stopped me trying to improve what I already have .
One day I think steam may make a return to direct drive type hybrids - instant power from zero up and no noise - may be a while though as this would mean industry would lose the fuel demand and every war runs on fuel .
In my changes along the way there were times when I thought "what have I done" am I going to blow my engine ,but for ten years travelling my vehicle was off the road for one day due to a clutch master slave repair which if I had the correct honing stones I could have negated this one .
Some figures since the first automobiles to current standings have not changed at the base line - same consumption city and highway - yet public truly believe modern cars are efficient .
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