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#11
12-31-2011, 03:41 AM
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Build a big motor and turn it slow...
Steve,
As we have discussed before, limiting the 455's rpm @ the mph that you want to cruise at is the best single way to push the mpg into the high teens or low 20s hen used in a 4-5,000 # vehicle. Keeping the cruise rpm south of 2500 works well for my heavy Pontiacs. My 500fhp 4100 TA with 2:73 gears has delivered 17mpg @ 75mph turning around 2300rpm. My 2:93 geared 4600# GP delivers 15 mpg @ 2500/75 mph and my 3:08 geared o/drive equipped 11 second 3960 # GTO delivers 16.5 mpg @ 80 mph/2300 rpm.
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Les Iden ---------------------------- '65 Buick Sport Wagon Custom, 340, T350, 3:23 '66 GTO Post/468, 700R4, 3.31 (Mike's as of 9-16) '68 Grand Prix/455, dual AFBs, T400, 2:93 posi (sold) '72 TA tribute/461, T400, 3.08, (Russ's as of 9-16) '97 Mitsubishi Eclipse Spyder Turbo, Konis, 5 speed '09 Torrent GXP, nav, Sun & Sound pkg., Bilsteins |
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