Quote:
Originally Posted by mixu-
Ok, so the first results are in for the Jazz air dam. ...That being said I don't have enough data (and no ABA yet) to say anything definitive. Realistic guess about the improvement would be about 5-8%.
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OK, so now I have ABA results. Or actually more like ABBAC results. I was mostly focusing on testing a kamm style "spoiler", but figured I'd do one last run to check the effectiveness of the air dam at the end.
Variables:
- Used the cruise control set to 80km/h according to OBD2
- There was no traffic in front of me at any point
- There was one stop in the trip (to turn around and head back). On my first B-run I had to accelerate a bit faster than I would've liked, hence the increased fuel consumption.
- Engine had reached 80C+ before I started
- Ambient temp was 12C when I started and 11C after the last round-trip.
- I looked for forced regens. One occurred at the first test round, but those results are not included here. Hybrid battery level showed about 70% for the duration of tests.
My 12km round-trips:
A: Without kammback, with airdam: 1st: 4,2l/100km
2x B: With spoiler, with airdam: 1st: 4,3l/100km 2nd: 4,2l/100km
A: Without kammback, with airdam: 1st: 4,2l/100km
C: Without airdam and without kammback: 1st: 4,1l/10km
Soo, all my mods, airdam included were actually hurting my mileage. Great success
As for why the airdam was not helping is probably related to the fact that the Jazz has a quite smooth underbelly and a small factory installed air dam to begin with. Me making the dam bigger did not seem to help.