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jedi_sol · 12-01-2009, 01:26 AM

In my old kammback thread, I was told the transition should be 10* to keep attached airflow. After building mine, i ended up with 13*, not sure if that is what affected my negative mpg readings.

Also, I was told by MetroMPG that the transition from the top to the side should be rounded, which i haven't figured out yet. Otherwise (correct me if im wrong MetroMPG) it would create vortices (spelling?) in that area.

BTW: my results: On a 100 mile roundtrip drive with cruise control set to 65mph. Ambient temperature both trips 61*F, filled up at 2:30pm both trips. Using the same gas pump.

without kammback = 45mpg
with kammback = 41mpg

*angry face*

BTW2: so jealous how shiny your paint is

12-01-2009, 01:26 AM	#17 (permalink)
jedi_sol Master EcoModder Join Date: Mar 2009 Location: Tustin, CA Posts: 929 2013 STi SOLD - '13 Subaru Impreza WRX STi Subaru Sports Cars Team Turbocharged! 90 day: 26.59 mpg (US) 1996 Geo Metro RETIRED from Ecomodding - '96 Geo Metro Base 90 day: 58.68 mpg (US) Thanks: 368 Thanked 380 Times in 238 Posts	In my old kammback thread, I was told the transition should be 10* to keep attached airflow. After building mine, i ended up with 13, not sure if that is what affected my negative mpg readings. Also, I was told by MetroMPG that the transition from the top to the side should be rounded, which i haven't figured out yet. Otherwise (correct me if im wrong MetroMPG) it would create vortices (spelling?) in that area. BTW: my results: On a 100 mile roundtrip drive with cruise control set to 65mph. Ambient temperature both trips 61F, filled up at 2:30pm both trips. Using the same gas pump. without kammback = 45mpg with kammback = 41mpg angry face BTW2: so jealous how shiny your paint is __________________ See the rest of the Sti project log: http://ecomodder.com/forum/showthrea...log-26612.html Last edited by jedi_sol; 12-01-2009 at 01:37 AM..