straight pipe = fuel efficiency
03-01-05, 10:57 AM
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straight pipe = fuel efficiency
hey just wondering if anyone can tell me how much fuel mileage i should expect to lose by getting rid of the 3 cats and putting on a straight down pipe to a muffler.
03-01-05, 11:07 AM
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My GXL's freeway cruise went from 22-24mpg to 24-27mpg when I replaced my exhaust. I don't think you'll lose mileage unless the newfound power and noise have you leaving the throttle on the floor all the time. 
03-01-05, 11:22 AM
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You should not loose any gas mileage you shoudl actually get better gas mileage. At least thats what I have noticed on every car I have owned. especially if you drive ont he highway a lot.
03-01-05, 04:03 PM
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Originally Posted by Low Impedance
thanks me having a TII i should loss some for the compensation needed for the boost increase....damn turbo
Last edited by therotaryrocket; 03-01-05 at 04:05 PM.
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03-01-05, 05:04 PM
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Is that thing Turbo?
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i think he might be saying that percent wise the increase in gas mileage on a turbo car might not be as much since adding a free flowing exhuast increases boost and uses more fuel, and boost should be considered cause most people with a turbo car put it in boost at least a little each time they drive it, i mean how couldn't you?
03-01-05, 07:51 PM
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Is that thing Turbo?
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Yes your getting rid of a restriction which means more boost and more boost equals more fuel and more power. If you just lost the restriction and didn't use more fuel you'd be in trouble running that lean. With that said i'm still think it would offer better fuel economy with unrestriced exhuast that without but just not quite the increase one may see on a non turbo car
03-01-05, 08:27 PM
#13
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My mileage has always been between 25-27 mpg with 3 different exhaust setups, the latest being an open system, so I'm in the "not much change" group...
Outside air temps affect my mileage more than anything else, believe it or not...
The car is only driven back & forth to work, 100 miles round trip, so I can get pretty exacting sampling numbers for mileage...Case in point- the last fillup, 11.584 gallons, at 300.8 miles, netted 25.9 mpg...
Outside air temps affect my mileage more than anything else, believe it or not...
The car is only driven back & forth to work, 100 miles round trip, so I can get pretty exacting sampling numbers for mileage...Case in point- the last fillup, 11.584 gallons, at 300.8 miles, netted 25.9 mpg...
