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Old 07-02-2014, 11:17 PM   #57 (permalink)
oldtamiyaphile
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Join Date: May 2009
Location: Australia
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UFI - '12 Fiat 500 Twinair
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Quote:
Originally Posted by Rango318 View Post
My torque app is reading that my load percentage is down, and it takes less throttle to do any given speed. It use to be 33% throttle was 50mph, now it is 58mph under the same engine load (~50%).

Here is the question. The fuel flow rate per hour is still the same numbers roughly. Wouldn't the larger injectors flow more fuel per hour? And if so, shouldn't that have changed my readout?
Generic OBD2 readers guess fuel consumption from airflow, they do not measure fuel flow at all. This is a notoriously unreliable method for many modern cars that use MAP sensors. You could double fuel flow and you'd still get the same reading.

FWIW, my SGII shows 1.5l/hr at idle for my 2.5, which is really high compared to the ~0.6 people report for their 1.9's. You can't trust OBD for fuel in TDi's it seems.
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