How to Use Less Fuel (yet another HHO thread, lacking substantive evidence)

[greenfuelbooster]

Restrict air after the MAF sensor. This will make the car think it is driving at high altitude. At high altitude there is less air. The ECU is forced to inject less fuel.

[RobertSmalls]

Isn't this equivalent to pressing less hard on the throttle pedal?

[Angmaar]

Sounds like the same idea of a WAI.

[Old Mechanic]

Air can have the same pressure and be less dense.

It needs to be either hotter or dryer.

I think of my driving as fuel accounting, fewest highest load (without enrichment) combustion events that I can use to maintain the same speed. Same for acceleration and deceleration.

The injector can vary the amount of fuel delivered by something like 1500%. The best delivery percentage is about three quarters of that. Most economical engines will produce close to BSFC power at 1500 RPM with a good load and less than 4 inches of vacuum, you can't really go too far wrong.

Pulse that way and glide, engine on or off.(off being about 10% more economical).

You can do slightly better than that with better information, but the difference will not be a heck of a lot. The range will vary much greater based on your average speed, than any more precise techniques.

In my VX what you notice is the gearing is soo tall. The car will do 120 in 3rd. If you need to maintain speed up a grade in the VX you are better off in lean burn and 3rd gear than 5th gear where you would have to floor the car to maintain the grade.

From what I understand in the VX 3rd gear is very close to 5th in a DX, so in the DX you would pulse much more agressively than you would in the much taller geared VX.

regards
Mech

[bgd73]

The injector can vary the amount of fuel delivered by something like 1500%

1500%? come on now. come back to earth like a carb jet that actually atomizes at the speed of sound...

it is no more than 100% of its given ability... where is the 1500 coming from?

it is clever trick with the maf, I could guess the o2 sensor makes up for actual density, restricted or not.

I wonder if my carb is 15 million percent. maybe 10 million.

from zero percent skip right past the 100 and make up numbers as I go along.

may as well add 3 times as much injection, double the valves, and increae fuel flow to 20 times that of a carb system..and pretend I am a hypermiler, with a 1500% throttle.

[greenfuelbooster]

I get 45 - 50 MPG highway on my 06 civic (my daily driver) ... The only problem with the setup is that the car loses some power. I added hydroxy gas to regain some power back. I documented my setup here:

[mwebb]

Originally Posted by greenfuelbooster

Restrict air after the MAF sensor. This will make the car think it is driving at high altitude. At high altitude there is less air. The ECU is forced to inject less fuel.

umm
no , your modification will not have any effect at all .

the MAF just counts the air , that's all , it can not measure pressure , directly , some systems like Ford s can use the MAF flow at WOT to CALCULATE BARO .

because VE is known and displacement is known and temperature is known and RPM is known .
pressure can be calculated .

feed back from the AFR sensor or 02 sensor will keep fuel trim and actual AFR right where the ECM wants it to be , to the limit of authority of the AFR sensor or 02 sensor .
==================================
so if flow is restricted , by your foot or by the plumbing , the result is the same
but
at WOT , your VE will suffer , strangled by the restriction.
altogether , not a good idea .
=====================================
why do you think it is a good idea ?
Does an 06 civic , your 06 civic even have a baro PID ? if yes , does the system arrive at the value using a MAP / Pressure / Baro sensor or a calculation ?
==========================
culled from the list of available PIDs for a 2006 Honda CRv

....
dding (22): All Injector Deactivation Mode
Adding (23): AT 'D' Position Switch
Adding (24): AT Neutral-Parking Switch
Adding (25): AT-CVT Reverse Position Switch Input Status
Adding (26): Barometric Air Pressure
Adding (27): Barometric Air Pressure - Volts
Adding (28): Battery Voltage
Adding (29): Block Learn For IG Timing Collection For Knocking Control
Adding (30): Block Learn For IG Timing Collection For Knocking Control EGR Condition
Adding (31): Brake Switch .....

we see a PID for Baro pressure and Baro sensor voltage , indicating that the value is measured by a pressure sensor , not calculated .

HHO is also a bad idea --------

[Arragonis]

Originally Posted by Old Mechanic

In my VX what you notice is the gearing is soo tall. The car will do 120 in 3rd. If you need to maintain speed up a grade in the VX you are better off in lean burn and 3rd gear than 5th gear where you would have to floor the car to maintain the grade.

I'm interested in researching this in my TDI a little more. The gearing in 6th is very high and I have experimenting with lugging in a high gear with as little throttle as possible to maintain speed and going into a lower gear and doing the same.

I haven't come up with a complete answer, sometimes the higher gear is better and sometimes the lower one is. I do the same route and try different things but its a toss up as to which one wins.

How does BSFC work for this ?

[greenfuelbooster]

I did this configuration on my 06 Civic since Jan 2009 ... I get consistently at least 45 MPG highway since then. The mechanic from Mr Tire saw the setup and said it mimics high altitude driving.

[RobertSmalls]

The ORNL studied the effect of intake restrictions: You have less power available (which will save gas iff you're a leadfoot, but you'd be better off just installing a heavier throttle spring), but in a modern fuel injected engine, there is no change in fuel economy because the computer is able to compensate for the intake restriction to keep the air:fuel ratio at its target.

http://www.fueleconomy.gov/feg/pdfs/...02_26_2009.pdf

GFB, I'm glad to hear your economy has improved. However, can you verify that your mods have any impact? This calls for A-B-A testing.