Quote:
Originally Posted by euromodder
Stll, it's what you recorded 
Don't make the air dam too low, it increases frontal area, and thus drag.
You could lose the aerodynamic improvement to the increased area.
As low as the lowest major car parts is OK.
Going deeper only adds extra area.
Are you sure it comes from the hood area ?
Wind noise is mainly due to A-pillar and mirrors, or wipers, if they are largely exposed. |
I had no evidence from anything else, so until I find some error, I must trust that be correct.
Drove bit more, now 1150km and still 1/4 tank left, if last 1/4 tank in gauge is same as in reality, then it would be again about same kind of FE, but I'm not 100% sure that it is, surely it is very close as I have usually seen 500km at half tank, and each quarter has been pretty much of 250km, that has made 5.5 to 5.8l/100km, but now with my current tank I'm again travelling some insane distances compared to time before mods and hypermiling, just drove slowly.
Frontal area increase is bit of issue of course, but there are parts that are quite low, like spare wheel and rear bumper is like parachute, so I put it quite low and then I hope to add sideskirts to control air entering underside a bit more.
Car's front bumper is not very high to begin with, but I did put it some 7,5cm lower with airdam, it seem to have quite large effect to fuel consumption, but I must gather more data to be able to say anything for sure, it might be that weather has been much nicer than before.
Better Kammback might help more, my current is rather crude with lot of sharp edges.
Wind noise comes from wiper and a-pillars + top of windshield. with air guide that would push air bit upwards, I might be able to reduce wind flow around wiper and also maybe would be possible to make air to hit windshield on bit better angle, at front of hood it did look better in flow illustrator, but that is not much of tool for the job, imo. There might be however point as air directed up would take time to come back down, if it comes down, other way would be to install it right at front of windshield, making cover for wiper blade (I have only one of them).
As I painted wheel skirts there was perhaps bit less rubbernecks, but people still stop and stare when I'm on traffic lights, maybe I should put some text to sides, like "lesser minds can't comprehend." or something as subtle and friendly. Most seem to think that someone would actually do such things for car because of looks, my mind is not enough to understand why anyone would do that, so I did order few stickers that remind with warning that has some strong wording how reading a tuning magazine will turn person to idiot, I think those will fit in very nicely.