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Old 10-09-2008, 08:12 PM   #1 (permalink)
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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.

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Last edited by TELVM; 10-09-2008 at 08:19 PM..
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Old 10-09-2008, 09:56 PM   #2 (permalink)
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Wow, this is neat stuff. I wonder if there's anyway to program it to detect the other gearing so that you could use it all the time, but I think that would require speed sensor input to compare against the rpms...

Thanks for all the great info!
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Old 10-10-2008, 05:56 AM   #3 (permalink)
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Quote:
Originally Posted by SVOboy View Post
I wonder if there's anyway to program it to detect the other gearing so that you could use it all the time, but I think that would require speed sensor input to compare against the rpms...
By defect, Megasquirt lacks VSS and is physically unable to detect which gear is engaged, so the only way would be a virtual gauge for each gear (five or six total). As above but doing calculations and adding code for every gear.

The result would be something like this:




You'd have to watch the gauge corresponding with the gear engaged at every moment. V.g. when in 3rd gear only the 'USMPG in 3rd gear' gauge would be true, the other four would lie.
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Old 10-29-2008, 12:58 AM   #4 (permalink)
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How, convenient, I have a 1.6 Miata . Thanks for the info!
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Old 03-03-2009, 05:33 PM   #5 (permalink)
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this is so awesome i had to register to say this!
And also ask a question
I dont know my gear or diff ratios, but i can find out exactly what RPM i am doing at certain GPS speed, can i use this information and plug it into the formula?

If the formula is establishing distance covered for every engine revolution in 5th then surely it can be done?

Thanks guys
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Old 04-28-2009, 01:24 PM   #6 (permalink)
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bumping this for myself.... gotta set this up on my laptop when I get home
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Old 04-28-2009, 02:35 PM   #7 (permalink)
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btw, it doesn't work on MS2 extra because it doesn't have the variables set up for it in the ini like MS1 extra does (for some reason). I got it working on MS2 extra after some ini modding .
small write-up here
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Old 04-28-2009, 02:37 PM   #8 (permalink)
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It *might* be worth it to add a speed signal to the cpu. I know I cover a lot of ground with the engine stopped.
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Old 05-27-2009, 02:51 PM   #9 (permalink)
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Quote:
Originally Posted by djivesp View Post
btw, it doesn't work on MS2 extra because it doesn't have the variables set up for it in the ini like MS1 extra does (for some reason). I got it working on MS2 extra after some ini modding .
small write-up here
Nice work djivesp! Could you please email your MS2 ini file or something it can copy and paste to matasjeff@yahoo.com so that I can try it?

Also, is there a variable for changing fuel pressure used for vehicles with 1:1 vac/boost fuel pressure regulators?

Thanks,

Jeff
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Old 05-27-2009, 06:28 PM   #10 (permalink)
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I put ms2 on a little thinkpad and created a RJ-45 female to DB9 female to extend my one stock SGII OBII cable to the serial port on my thinkpad. This failed, but I wonder if it is because I have a honda - I did a quick google search and found that some honda people either achieved no success with MS2, or had to do a lot of little tweaks to get it to work. Does anyone know about this or have any tips on where to proceed next? I'm pretty sure my cable is fine.

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