Quote:
Originally Posted by TeamZleep
Also, I can't really vouch for the accuracy of the mpg display, but I have noticed this:
These are all my averages, reset before I leave each way.. about 5-7 miles city driving/25-30 miles highway combined on my drive to work one way.
Muffler delete: 27.5 avg.
Muffler delete with the diffuser I just took off: 29mpg avg.
Apexi. N1 with the diffuser in the pictures: 34.7-36.4 avg. mpg.
My driving style doesn't change. I zip around in the city areas, then do 5-10mph over the speed limit with cruise control set. Speeds on the highway are 55-70. I usually do 65-75. I've been logging this new setup since Sunday.
I really think it has to do with the change in area coverage/and angle of the flat portion of the diffuser/number of fins. I think the old setup had too much going on.
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Some of my pacnw guys have sent me text photos of 38+ mpg on the dash.
Your theory about angles and such is correct to the extent that the lower the angle the less downforce created but higher drag reduction and vice versa (to a limit of about 14 degrees.) Eco-modders will build diffusers for drag reduction and try to keep them close to 0 degrees, not generating downforce but reducing the drag drastically. I've thought about doing it on my kid-hauler
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-'13 Subaru BRZ Limited, SWP. (Mods: Driveway Labs full aero, MCA, etc)
-'06 Mitsubishi Eclipse 3.8L, UV blue. (Mods: turbocharged, full suspension, too much to list)
-'13 Town and Country Limited (Mods: too many kids)