Fuel flow display on ms3

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Suprazz
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Fuel flow display on ms3

Post by Suprazz »

Hi,

I'm trying to understand the difference in tuner studio.

Fuel flow (avg) : display the same thing as the fuelflow indicatior on the real-time display (so the exact same value that the ms3 1.41 output).

But, fuelflowccpermin in the trip/economy menu display around 20cc higher (764 vs 784).

Also, Instant fuel economy in the trip/economy menu display 0 but economy_l_100km in the calculation 3 menu display the right value.
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LT401Vette
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Re: Fuel flow display on ms3

Post by LT401Vette »

There are 2 sets of Fuel Flow gauges with MS3.

The ones under the "Trip / Economy" menu are calculated by TunerStudio, the others are calculated in the firmware.

The 2.6% delta is likely some difference in the calculation. I can give you 2 improvements on the list for the TS calcs:

- TS uses 1 open time for all injectors, so if you have different open times, this will cause some error.
- TS is using a single pulsewidth "pulseWidth1" to calculate the net duty cycle, so if you have cylinder trim, there will be an error.

I don't know for sure if the firmware calcs are already addressing these and that would explain the small delta you are seeing.
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Re: Fuel flow display on ms3

Post by jsmcortina »

LT401Vette wrote:- TS uses 1 open time for all injectors, so if you have different open times, this will cause some error.
- TS is using a single pulsewidth "pulseWidth1" to calculate the net duty cycle, so if you have cylinder trim, there will be an error.

I don't know for sure if the firmware calcs are already addressing these and that would explain the small delta you are seeing.
The firmware adds on each injector pulse individually including transient events, deadtime, battery voltage changes etc. and allows for staged injector size differences. That data isn't available on a per injection basis for TunerStudio to do its calcs.

James
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Suprazz
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Re: Fuel flow display on ms3

Post by Suprazz »

So the ms3 fuelflow is more precise than the tunerstudio estimated fuelflowccpermin. So I'll continue this way then.

Thanks
Best looking and most advanced CAN-bus gauge
Toyota Supra 7MGE, 7M-GTE and 1JZ-GTE Plug and play ECUs: http://www.perfecttuning.net
Serial to Bluetooth or Serial to WiFi
DIYAutotune Canadian, EFI Source and ECUMaster reseller!
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