tripower or four barrel
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
I don't know anyone who tunes a Holley 4-bbl carb strictly for economy. They purchase such a carb for performance. And, if it is set up for performance, it won't be in the running for "lowest mpg".... 
....even if you keep your foot out of it.
....even if you keep your foot out of it.
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,212
Likes: 9,350
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
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Dont you tune a carb for best performance on a particular motor? 14.7 A/FR stoichiometric value doesnt change for how you tune. 14.7 at idle, and cruise and 12.5 for WOT. Maybe 13 .5 at idle if your car needs to be richer. ITs how the motor is built that decides how much gas its needs hence the jet changes and idle set screw changes. IF you have a 8.5:1 economy mild cam car its going to be tuned to those same values. The jets are just going to be different than an 11:1 fire breathing monster. The given engine will then have a best mpg for its gearing and driving conditions. You cannot tune a 1150 carb to be an economy fuel miser as well as putiing 500 cfm carb on a 1200 hp dragster. A given engine to run efficiently needs to have optimum air flow for what it can use.
Now you can use a 750 quadrajet and detune it work on a 285 hp 350 and use that same 750 on a 500 hp motor and retune it. Obviously the rods, and jets would be different but the AFR would be the same. But the respective gas mileage given the same driver and the same driving characteristics, the 500hp car would use more fuel because its designed to.
As far as I know Holley makes carbs for fuel economy cars as well as race cars
Now you can use a 750 quadrajet and detune it work on a 285 hp 350 and use that same 750 on a 500 hp motor and retune it. Obviously the rods, and jets would be different but the AFR would be the same. But the respective gas mileage given the same driver and the same driving characteristics, the 500hp car would use more fuel because its designed to.
As far as I know Holley makes carbs for fuel economy cars as well as race cars
Race Director
Joined: Jul 2018
Posts: 10,591
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From: San Antonio, TX/Mahopac, NY
2026 Restomod of the Year Winner
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Four barrel hands down.
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,212
Likes: 9,350
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
...going for the looks.....
