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Old 07-31-2014, 09:07 PM   #46 (permalink)
EcoModding Apprentice
Join Date: Oct 2008
Location: Chile
Posts: 223

Mercedes 89 D - '89 Mercedes 300 E
90 day: 33.86 mpg (US)

Skodie - '09 Skoda Octavia TDI PD
90 day: 38.84 mpg (US)

1993 Mercedes 300D Turbo - '93 Mercedes Benz 300D Turbo W124
90 day: 26.19 mpg (US)

Crossie - '16 Subaru XV Crosstreak
90 day: 9.61 mpg (US)

Crossie - '16 Subaru XV Crosstreak
90 day: 33.34 mpg (US)
Thanks: 15
Thanked 9 Times in 7 Posts
How can we measure LOAD on a diesel engine?

A gasoline engine has a direct relation between MAF (Mass airflow I think) and fuel consumption, as it uses stoichiometric combustion, which mean 14.7 parts of air per one of fuel.

So, having a MAF sensor in the air inlet allows one to estimate directly and with reasonable realism the fuel used in real time.

However, a diesel engine behaves different, and relation between air and fuel may vary a lot, depending on load.

Does someone in the Forum have a good estimation method of load, to use this information in a fuel computer?

True that the ideal system to use is a fuel computer, a speed digital signal, a fuel consumption digital signal. This last signal isn't present in a indirect injection old diesel engine (IDI), and must be generated somehow.

One way is direct: install two fuel flow meters and calculate difference between these. However, if you want reliable, strong and long lasting fuel flow meters, prepare your wallet. And you need to cut the fuel pipes or hoses. This mean leaks.

Other way is indirect, using signals that exist in these cars, or by installing a sensor to generate it.

Any new ideas?

Mercedes 300 D turbo 1993
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