Olivier22 wrote:The road test alone is worthless. The conditions are too variable. My car also has a consumption that changes a little from one full to another, without that I hack.
I have what I have long believed and shout on all roofs but it's wrong! Mine is on the contrary very stable in consumption ... if I attack more I do not see too many differences (within the reasonable limit)
Then everything depends on the economy achieved ... 20% is quite measurable and perceptible on the road, less than 5% it is lost lost ...
Olivier22 wrote:To pass one's car on a roller blind does not cost the eyes of the head either; saw your investment in the project (all your honor), in your place it is one of the first things that I would have done. In addition there is sometimes the possibility to ask a flow meter of gasoline, it would bring you valuable information.
When we see the results of the VW bench ... bin the benches that's more!
I think a simple ELM327 and Torque (I bought the pro version at 5 € a few weeks ago) would do the trick too ... on the road for a few euros of investment! Because it allows to have access to very precise data!
Here is the kind of info you can get with something at 10 €: eat-less-auto / volkswagen golf-gte85-over-the-multifuel hybrid-SYCOMOREEN-t15053-20.html # p326469
Christophe wrote:Some examples that come to my mind:
- air flow g / s swallowed by the engine, very interesting especially on a gasoline (because it allows to estimate the actual engine power and consumption very easily)
- instantaneous power (CV) but here I think it is a calculation according to the acceleration and the mass of the vehicle (estimated)
- turbo pressure
- common rail pressure (up to 1500 bars!)
- instantaneous consumption (but it is also on the onboard computer, but it allows to compare ...)
- real-time EGR value
- ...
We talk about it here: failure-payday-repair / OBD-erase-the-error-of-the-computer-to-edge-after-repair-of-all-brands-t14557.html