Tested 1/31/07 - 40 degree ambient temp. Drove very conservatively on secondary highway and got only 8 mpg. Noted K&N A/F meter reading somewhat rich. Specs:
1979 Trans Am, no AC, 3.42 gears, TH-350, 1973 455 w/6X heads (9.25:1), Crane Energizer 272 H10 (454 lift, 1.5 rocker ratio, 216 degree at .050, 160 degree thermostat and blocked heat risers, Edelbrock Performer intake, Q-Jet carb, open shaker hood; stock log-type w/H-pipe, 2.5" duals, Dynomax turbo mufflers, 10W40 oil.
Before changing to 3.42s from 2.41s best was 15-16 mpg. Plan on overdrive - either 200 4R or 700 R4.
Should gas mileage improve by putting in a hotter thermostat?
Can the carb be made to run leaner while cruising, but still put out maximum power at WOT?
Shooting for 18-20 mpg. Is this possible with this combo?
Thanks for your input!
1979 Trans Am, no AC, 3.42 gears, TH-350, 1973 455 w/6X heads (9.25:1), Crane Energizer 272 H10 (454 lift, 1.5 rocker ratio, 216 degree at .050, 160 degree thermostat and blocked heat risers, Edelbrock Performer intake, Q-Jet carb, open shaker hood; stock log-type w/H-pipe, 2.5" duals, Dynomax turbo mufflers, 10W40 oil.
Before changing to 3.42s from 2.41s best was 15-16 mpg. Plan on overdrive - either 200 4R or 700 R4.
Should gas mileage improve by putting in a hotter thermostat?
Can the carb be made to run leaner while cruising, but still put out maximum power at WOT?
Shooting for 18-20 mpg. Is this possible with this combo?
Thanks for your input!
Attachments
-
171.1 KB Views: 388
-
126.4 KB Views: 357