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EcoModding Lurker
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How to get instant fuel consumption from Megasquirt
This works for MS1-Extra/MSnS-E, combat proven. Most probably will also work for MS2. No vehicle speed input is required  .
Data we must know beforehand:
- 5th gear ratio
- Differential ratio
- Tractive wheel perimeter in centimeters
- Injector flow in cc
For instance in a Miata NA 1.6 the data are:
- 0.814
- 4.300
- 181.4583917 cm
- 205 cc
Then input the data into this formula:
RPM = ((((100*100000)/60)/wheel perimeter)*(5th gear ratio*differential ratio))
For the Miata:
RPM = ((((100*100000)/60)/181.4583917)*(0.814*4.300)) = 3215 (this will be the magic number)
Now open with notepad the msns-extra.ini file, the path is C:\Program files\MegaSquirt\your-project-car-name\msns-extra.ini . Then choose your way ...
OPTION ONE: FOR LITRES/100KM DISPLAY
Look for this paragraph towards the end of the file:
Code:
;****************************************************************************
; CHANGE THESE TO SUIT YOUR CAR TO GET MPG, MPH, ETC. THIS WILL ONLY WORK WITH A SUITABLE
; VEHICLE SPEED SENSOR CONNECTED TO MSnS-EXTRA CODE.
Speed = { 70 } ; Change this to your actual speed @ 2.5V from VSS circuit
fuelCC = { 2168 } ; Enter the total flow for all your injectors here in cc/Min
;****************************************************************************
squirtmul = { divider1 < 2 ? 2 : divider1 < 3 ? 1 : divider1 < 5 ? 0.5 : divider1 < 9 ? 0.25 : divider1 < 17 ? 0.125 : 1 }
squirts = { alternate1 > 0 ? rpm100 / 0.6 * squirtmul : rpm100 * 2 * squirtmul / 0.6 } ; How many squirts per Sec
OpenWidth = { injOpen1 * 0.1 } ; Pulse width for injector opening time
CCpHr = { pulseWidth < 1 ? 1 : (fuelCC/60) * ((pulseWidth - OpenWidth)/1000) * squirts * 3600 } ; cc / hr
mphTemp = { fuelADC < 1 ? 0 : (fuelADC * Speed) /127.5 } ; MPH
mph = { mphTemp < 1 ? 0 : mphTemp } ; Ensure we get 0 mph
USgph = { CCpHr / 3785 } ; US Gallons / Hr
USmpg = { fuelADC < 1 ? 0 : mph < 1 ? 0 : mph / USgph } ; US Miles / Gallon
gph = { CCpHr / 4546 } ; Real Gallons / Hr
mpg = { fuelADC < 1 ? 0 : mph < 1 ? 0 : mph / gph } ; Real Miles / Gallon
;*****************************************************************************
In 'fuelCC' we must enter the injector flow, times number of injectors (if simultaneous injection). Or injector flow, times number of injectors, divided by 2 (if batch injection). For this particular Miata it is (205*4)/2 = 410 :
Code:
;****************************************************************************
; CHANGE THESE TO SUIT YOUR CAR TO GET MPG, MPH, ETC. THIS WILL ONLY WORK WITH A SUITABLE
; VEHICLE SPEED SENSOR CONNECTED TO MSnS-EXTRA CODE.
Speed = { 70 } ; Change this to your actual speed @ 2.5V from VSS circuit
fuelCC = { 410 } ; Enter the total flow for all your injectors here in cc/Min
;****************************************************************************
squirtmul = { divider1 < 2 ? 2 : divider1 < 3 ? 1 : divider1 < 5 ? 0.5 : divider1 < 9 ? 0.25 : divider1 < 17 ? 0.125 : 1 }
squirts = { alternate1 > 0 ? rpm100 / 0.6 * squirtmul : rpm100 * 2 * squirtmul / 0.6 } ; How many squirts per Sec
OpenWidth = { injOpen1 * 0.1 } ; Pulse width for injector opening time
CCpHr = { pulseWidth < 1 ? 1 : (fuelCC/60) * ((pulseWidth - OpenWidth)/1000) * squirts * 3600 } ; cc / hr
mphTemp = { fuelADC < 1 ? 0 : (fuelADC * Speed) /127.5 } ; MPH
mph = { mphTemp < 1 ? 0 : mphTemp } ; Ensure we get 0 mph
USgph = { CCpHr / 3785 } ; US Gallons / Hr
USmpg = { fuelADC < 1 ? 0 : mph < 1 ? 0 : mph / USgph } ; US Miles / Gallon
gph = { CCpHr / 4546 } ; Real Gallons / Hr
mpg = { fuelADC < 1 ? 0 : mph < 1 ? 0 : mph / gph } ; Real Miles / Gallon
;*****************************************************************************
Now we add an user defined variable with its formula:
Code:
;****************************************************************************
; CHANGE THESE TO SUIT YOUR CAR TO GET MPG, MPH, ETC. THIS WILL ONLY WORK WITH A SUITABLE
; VEHICLE SPEED SENSOR CONNECTED TO MSnS-EXTRA CODE.
Speed = { 70 } ; Change this to your actual speed @ 2.5V from VSS circuit
fuelCC = { 410 } ; Enter the total flow for all your injectors here in cc/Min
;****************************************************************************
squirtmul = { divider1 < 2 ? 2 : divider1 < 3 ? 1 : divider1 < 5 ? 0.5 : divider1 < 9 ? 0.25 : divider1 < 17 ? 0.125 : 1 }
squirts = { alternate1 > 0 ? rpm100 / 0.6 * squirtmul : rpm100 * 2 * squirtmul / 0.6 } ; How many squirts per Sec
OpenWidth = { injOpen1 * 0.1 } ; Pulse width for injector opening time
CCpHr = { pulseWidth < 1 ? 1 : (fuelCC/60) * ((pulseWidth - OpenWidth)/1000) * squirts * 3600 } ; cc / hr
mphTemp = { fuelADC < 1 ? 0 : (fuelADC * Speed) /127.5 } ; MPH
mph = { mphTemp < 1 ? 0 : mphTemp } ; Ensure we get 0 mph
USgph = { CCpHr / 3785 } ; US Gallons / Hr
USmpg = { fuelADC < 1 ? 0 : mph < 1 ? 0 : mph / USgph } ; US Miles / Gallon
gph = { CCpHr / 4546 } ; Real Gallons / Hr
mpg = { fuelADC < 1 ? 0 : mph < 1 ? 0 : mph / gph } ; Real Miles / Gallon
L100in5th = { (CCpHr/1000)*(3215/RpmHiRes) } ; Litres/100 in 5th gear
;*****************************************************************************
Now we look for the paragraph ' [GaugeConfigurations] ' :
Code:
[GaugeConfigurations]
...
...
; Extra Stuff
...
...
mpgGauge = mpg, "MPG", "MPG", 0, 100, -1, -1, 100, 100, 1
YGForceGauge = YForce, "Y G-Force", "G", -3, 3, 0, 0, 2, 3, 3
XGForceGauge = XForce, "X G-Force", "G", -3, 3, 0, 0, 2, 3, 3
MAFGauge = MAFVolts, "Volts", "V", 0, 5, 0, 0, 5, 5, 2
bcDCGauge = bcDC, "Boost Control DC", "%", 0, 100, -1, -1 999, 999, 0, 0
idleDCGauge = idleDC, "Idle DC", "%", 0, 100, -1, -1 999, 999, 0, 0
RealDutyGauge1 = dutyCy1Real, "Fuel Delivery 1", "Flow", 0, 75, -1, -1, 75, 75, 1, 1
RealDutyGauge2 = dutyCy2Real, "Fuel Delivery 2", "Flow", 0, 75, -1, -1, 75, 75, 1, 1
;-------------------------------------------------------------------------------
And we add this line at the end of the paragraph:
Code:
[GaugeConfigurations]
...
...
; Extra Stuff
...
...
mpgGauge = mpg, "MPG", "MPG", 0, 100, -1, -1, 100, 100, 1
YGForceGauge = YForce, "Y G-Force", "G", -3, 3, 0, 0, 2, 3, 3
XGForceGauge = XForce, "X G-Force", "G", -3, 3, 0, 0, 2, 3, 3
MAFGauge = MAFVolts, "Volts", "V", 0, 5, 0, 0, 5, 5, 2
bcDCGauge = bcDC, "Boost Control DC", "%", 0, 100, -1, -1 999, 999, 0, 0
idleDCGauge = idleDC, "Idle DC", "%", 0, 100, -1, -1 999, 999, 0, 0
RealDutyGauge1 = dutyCy1Real, "Fuel Delivery 1", "Flow", 0, 75, -1, -1, 75, 75, 1, 1
RealDutyGauge2 = dutyCy2Real, "Fuel Delivery 2", "Flow", 0, 75, -1, -1, 75, 75, 1, 1
L100in5thGauge = L100in5th, "F.Cons. in 5th", "l./100", 0, 30, 0, 0, 10, 20, 1
;-------------------------------------------------------------------------------
Lastly we look for the ' [FrontPage] ' paragraph:
Code:
[FrontPage]
#if NARROW_BAND_EGO
egoLEDs = 0.0, 1.0, 0.5 ; NB settings.
#else
; If you reverse these range values as you see below, then the LED
; bar will work as you expect, high on the right, low on the left.
egoLEDs = 4.0, 1.0, 2.5 ; WB settings.
#endif
; Gauges are numbered left to right, top to bottom.
;
; 1 2 3 4
; 5 6 7 8
;Gauge Setup 0
gauge1 = RpmHiResGauge
gauge2 = cltGauge
gauge3 = pulseWidth1Gauge
gauge4 = dutyCycle1Gauge
gauge5 = mapGauge
gauge6 = matGauge
gauge7 = afrGauge
gauge8 = advanceGauge
And do this change:
Code:
[FrontPage]
#if NARROW_BAND_EGO
egoLEDs = 0.0, 1.0, 0.5 ; NB settings.
#else
; If you reverse these range values as you see below, then the LED
; bar will work as you expect, high on the right, low on the left.
egoLEDs = 4.0, 1.0, 2.5 ; WB settings.
#endif
; Gauges are numbered left to right, top to bottom.
;
; 1 2 3 4
; 5 6 7 8
;Gauge Setup 0
gauge1 = RpmHiResGauge
gauge2 = cltGauge
gauge3 = pulseWidth1Gauge
; gauge4 = dutyCycle1Gauge
gauge4 = L100in5thGauge
gauge5 = mapGauge
gauge6 = matGauge
gauge7 = afrGauge
gauge8 = advanceGauge
Job done. Save the msns-extra.ini file. Next time you open Megatune you'll see a new virtual gauge showing instant fuel consumption in litres/100 km, something like this (increase brightness if necessary):
It will only be valid for the 5th gear, but it's precise and free.
OPTION TWO: FOR USMPG DISPLAY
Look for this paragraph towards the end of the file:
Code:
;****************************************************************************
; CHANGE THESE TO SUIT YOUR CAR TO GET MPG, MPH, ETC. THIS WILL ONLY WORK WITH A SUITABLE
; VEHICLE SPEED SENSOR CONNECTED TO MSnS-EXTRA CODE.
Speed = { 70 } ; Change this to your actual speed @ 2.5V from VSS circuit
fuelCC = { 2168 } ; Enter the total flow for all your injectors here in cc/Min
;****************************************************************************
squirtmul = { divider1 < 2 ? 2 : divider1 < 3 ? 1 : divider1 < 5 ? 0.5 : divider1 < 9 ? 0.25 : divider1 < 17 ? 0.125 : 1 }
squirts = { alternate1 > 0 ? rpm100 / 0.6 * squirtmul : rpm100 * 2 * squirtmul / 0.6 } ; How many squirts per Sec
OpenWidth = { injOpen1 * 0.1 } ; Pulse width for injector opening time
CCpHr = { pulseWidth < 1 ? 1 : (fuelCC/60) * ((pulseWidth - OpenWidth)/1000) * squirts * 3600 } ; cc / hr
mphTemp = { fuelADC < 1 ? 0 : (fuelADC * Speed) /127.5 } ; MPH
mph = { mphTemp < 1 ? 0 : mphTemp } ; Ensure we get 0 mph
USgph = { CCpHr / 3785 } ; US Gallons / Hr
USmpg = { fuelADC < 1 ? 0 : mph < 1 ? 0 : mph / USgph } ; US Miles / Gallon
gph = { CCpHr / 4546 } ; Real Gallons / Hr
mpg = { fuelADC < 1 ? 0 : mph < 1 ? 0 : mph / gph } ; Real Miles / Gallon
;*****************************************************************************
In 'fuelCC' we must enter the injector flow, times number of injectors (if simultaneous injection). Or injector flow, times number of injectors, divided by 2 (if batch injection). For this Miata it is (205*4)/2 = 410 :
Code:
;****************************************************************************
; CHANGE THESE TO SUIT YOUR CAR TO GET MPG, MPH, ETC. THIS WILL ONLY WORK WITH A SUITABLE
; VEHICLE SPEED SENSOR CONNECTED TO MSnS-EXTRA CODE.
Speed = { 70 } ; Change this to your actual speed @ 2.5V from VSS circuit
fuelCC = { 410 } ; Enter the total flow for all your injectors here in cc/Min
;****************************************************************************
squirtmul = { divider1 < 2 ? 2 : divider1 < 3 ? 1 : divider1 < 5 ? 0.5 : divider1 < 9 ? 0.25 : divider1 < 17 ? 0.125 : 1 }
squirts = { alternate1 > 0 ? rpm100 / 0.6 * squirtmul : rpm100 * 2 * squirtmul / 0.6 } ; How many squirts per Sec
OpenWidth = { injOpen1 * 0.1 } ; Pulse width for injector opening time
CCpHr = { pulseWidth < 1 ? 1 : (fuelCC/60) * ((pulseWidth - OpenWidth)/1000) * squirts * 3600 } ; cc / hr
mphTemp = { fuelADC < 1 ? 0 : (fuelADC * Speed) /127.5 } ; MPH
mph = { mphTemp < 1 ? 0 : mphTemp } ; Ensure we get 0 mph
USgph = { CCpHr / 3785 } ; US Gallons / Hr
USmpg = { fuelADC < 1 ? 0 : mph < 1 ? 0 : mph / USgph } ; US Miles / Gallon
gph = { CCpHr / 4546 } ; Real Gallons / Hr
mpg = { fuelADC < 1 ? 0 : mph < 1 ? 0 : mph / gph } ; Real Miles / Gallon
;*****************************************************************************
Now we add an user defined variable with its formula:
Code:
;****************************************************************************
; CHANGE THESE TO SUIT YOUR CAR TO GET MPG, MPH, ETC. THIS WILL ONLY WORK WITH A SUITABLE
; VEHICLE SPEED SENSOR CONNECTED TO MSnS-EXTRA CODE.
Speed = { 70 } ; Change this to your actual speed @ 2.5V from VSS circuit
fuelCC = { 410 } ; Enter the total flow for all your injectors here in cc/Min
;****************************************************************************
squirtmul = { divider1 < 2 ? 2 : divider1 < 3 ? 1 : divider1 < 5 ? 0.5 : divider1 < 9 ? 0.25 : divider1 < 17 ? 0.125 : 1 }
squirts = { alternate1 > 0 ? rpm100 / 0.6 * squirtmul : rpm100 * 2 * squirtmul / 0.6 } ; How many squirts per Sec
OpenWidth = { injOpen1 * 0.1 } ; Pulse width for injector opening time
CCpHr = { pulseWidth < 1 ? 1 : (fuelCC/60) * ((pulseWidth - OpenWidth)/1000) * squirts * 3600 } ; cc / hr
mphTemp = { fuelADC < 1 ? 0 : (fuelADC * Speed) /127.5 } ; MPH
mph = { mphTemp < 1 ? 0 : mphTemp } ; Ensure we get 0 mph
USgph = { CCpHr / 3785 } ; US Gallons / Hr
USmpg = { fuelADC < 1 ? 0 : mph < 1 ? 0 : mph / USgph } ; US Miles / Gallon
gph = { CCpHr / 4546 } ; Real Gallons / Hr
mpg = { fuelADC < 1 ? 0 : mph < 1 ? 0 : mph / gph } ; Real Miles / Gallon
USMPG5th = { 235.2/((CCpHr/1000)*(3215/RpmHiRes)) } ; USMPG in 5th gear
;*****************************************************************************
Now we look for the paragraph ' [GaugeConfigurations] ' :
Code:
[GaugeConfigurations]
...
...
; Extra Stuff
...
...
mpgGauge = mpg, "MPG", "MPG", 0, 100, -1, -1, 100, 100, 1
YGForceGauge = YForce, "Y G-Force", "G", -3, 3, 0, 0, 2, 3, 3
XGForceGauge = XForce, "X G-Force", "G", -3, 3, 0, 0, 2, 3, 3
MAFGauge = MAFVolts, "Volts", "V", 0, 5, 0, 0, 5, 5, 2
bcDCGauge = bcDC, "Boost Control DC", "%", 0, 100, -1, -1 999, 999, 0, 0
idleDCGauge = idleDC, "Idle DC", "%", 0, 100, -1, -1 999, 999, 0, 0
RealDutyGauge1 = dutyCy1Real, "Fuel Delivery 1", "Flow", 0, 75, -1, -1, 75, 75, 1, 1
RealDutyGauge2 = dutyCy2Real, "Fuel Delivery 2", "Flow", 0, 75, -1, -1, 75, 75, 1, 1
;-------------------------------------------------------------------------------
And we add this line at the end of the paragraph:
Code:
[GaugeConfigurations]
...
...
; Extra Stuff
...
...
mpgGauge = mpg, "MPG", "MPG", 0, 100, -1, -1, 100, 100, 1
YGForceGauge = YForce, "Y G-Force", "G", -3, 3, 0, 0, 2, 3, 3
XGForceGauge = XForce, "X G-Force", "G", -3, 3, 0, 0, 2, 3, 3
MAFGauge = MAFVolts, "Volts", "V", 0, 5, 0, 0, 5, 5, 2
bcDCGauge = bcDC, "Boost Control DC", "%", 0, 100, -1, -1 999, 999, 0, 0
idleDCGauge = idleDC, "Idle DC", "%", 0, 100, -1, -1 999, 999, 0, 0
RealDutyGauge1 = dutyCy1Real, "Fuel Delivery 1", "Flow", 0, 75, -1, -1, 75, 75, 1, 1
RealDutyGauge2 = dutyCy2Real, "Fuel Delivery 2", "Flow", 0, 75, -1, -1, 75, 75, 1, 1
USMPG5thGauge = USMPG5th, "USMPG in 5th", "USMPG", 0, 30, 0, 0, 10, 20, 1
;-------------------------------------------------------------------------------
Lastly we look for the ' [FrontPage] ' paragraph:
Code:
[FrontPage]
#if NARROW_BAND_EGO
egoLEDs = 0.0, 1.0, 0.5 ; NB settings.
#else
; If you reverse these range values as you see below, then the LED
; bar will work as you expect, high on the right, low on the left.
egoLEDs = 4.0, 1.0, 2.5 ; WB settings.
#endif
; Gauges are numbered left to right, top to bottom.
;
; 1 2 3 4
; 5 6 7 8
;Gauge Setup 0
gauge1 = RpmHiResGauge
gauge2 = cltGauge
gauge3 = pulseWidth1Gauge
gauge4 = dutyCycle1Gauge
gauge5 = mapGauge
gauge6 = matGauge
gauge7 = afrGauge
gauge8 = advanceGauge
And do this change:
Code:
[FrontPage]
#if NARROW_BAND_EGO
egoLEDs = 0.0, 1.0, 0.5 ; NB settings.
#else
; If you reverse these range values as you see below, then the LED
; bar will work as you expect, high on the right, low on the left.
egoLEDs = 4.0, 1.0, 2.5 ; WB settings.
#endif
; Gauges are numbered left to right, top to bottom.
;
; 1 2 3 4
; 5 6 7 8
;Gauge Setup 0
gauge1 = RpmHiResGauge
gauge2 = cltGauge
gauge3 = pulseWidth1Gauge
; gauge4 = dutyCycle1Gauge
gauge4 = USMPG5thGauge
gauge5 = mapGauge
gauge6 = matGauge
gauge7 = afrGauge
gauge8 = advanceGauge
Jod done. Save the msns-extra.ini file. Next time you open Megatune you'll see a new virtual gauge showing instant fuel consumption in USMPG, something like this (increase brightness if necessary):
It will only be valid for the 5th gear, but it's precise and free.
__________________
Last edited by TELVM; 10-09-2008 at 09:19 PM..
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