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10-24-2004 07:56 PM #1
Blown 350, Better Gas Mileage Possible
Hey guys I am a refuge over from the CobraClub and need some help.
I have a B&M supercharged 350 and am getting horrible gas mileage. On the order of ~5 mpg in town and ~7 mpg on the freeway. Currently I am running 9 pounds of boost on 91 octane stuff, compression is 7.2:1 rear end ration is 2.91 cruising around 2400 rpm at 65
I need to get better gas mileage for the simple fact that am taking longer trips in the car and can't get a fuel cell bigger then 10 gallons to fit in the trunk.
I dropped the boost down to try and get some better numbers (4 psi). In town numbers shot to ~8 mpg and freeway to ~11 mpg.
I still want to drop the boost down some more, but am worried mainly because I can;t find anybosy else doing this. I am afriad most of all if roms that the blower spin at are two low the idle will go all to heck?
Also after talking to Holley, they believe that I can run a 600crf supercharger specific carb down from my 800 double pumper. Anybody know what that will do to the gas mileage.
I know my jetting is right because my wideband is kicking out readings around 13:1 accross the board, but my cruise seams to float around 12:1 which seams a little rich to me.
So any pointers would be great, I need to get at least 15 mpg out of this thing to continue driving it. If I pull the blower and put a more traditional setup on the motor whats a well built 350 putting out about 300hp with a street cam get for mileage. (Cars 2200 pounds)
Ditto on the model kits! My best were lost when the Hobby Shop burned under suspicious circumstances....
How did you get hooked on cars?