tylerl90

Does forced induction of any kind, increase gas mileage in any way?

67mustang302

Theoretically, yes.You could build a turbo setup that's designed to provide some boost at low rpm/part throttleto increase cylinder pressure at cruise rpm and throttle position, increasing combustion efficiency. In theory it should increase mileage due to better efficiency. Engines have poor efficiency at low rpm and minimal throttle position, so the boost pressure should allow for more complete and rapid combustion.

MU71L4710N

other than some miracle of a design that would cost thousands of dollars to set up the answer is no. you could get nitrous and it wouldnt do anything to your gas mileage until you use it, but the rest are going to burn more gas than your car does right now.

turbo or a blower wont kill gas mileage if you granny it and stay out of boost

its simple numbers

more air = more fuel bieng injected into the cylinders = more power.

Blackhawk

Yes, as long as you don't drive over 3000rpm in any gear.

MU71L4710N

isnt it like 2000 rpm for a roots style? thought they made boost at lower rpm

tylerl90

Thanks.

Note: I was asking this to prove a point. My friend seems to think he's hot s*it and knows everything about cars and made the ignorant statement that "forced induction improves fuel economy by like 5mpg." I laughed at him. Period.

67mustang302

Yeah, roots/screw superchargers depending on the setup, can start boosting around 2,000rpm. But, it's driven by a belt, so cruising at part throttle you're not really making any usable boost, but still taking power to turn the blower. A turbo can be sized such that it starts boosting at the same rpm, or even lower.

And I doubt you'd get a f/i engine to gain 5mpg unless you purpose built it to specifically do just that.

RJW

Lets think about it this way. Long bed, quad cab, heavy duty, 4x4 '06 Ram 2500 with a 6.0L CTD. The Cummins itself weighs over 1kLb. The entire package weighs 6500+. Do you think the same 6L would get the same 22 miles per gallon without the turbo?


I can tell you, mathematics and science show that forced indcution can improve fuel economy. More air may mean more fuel, but an astronomical VE and a properly used set-up will yield great results. It just so happens that most FI systems you have seen or paid much attention to were built with pure power in mind. That 6500lb CTD gets single digits when the boost guage is pegged and the soote is pouring out.

RJW

By the way, I'm not just speaking out of my ****. I don't have any online resources saved on this particular computer, but the book "Maximum Boost" by Corky Bell is a good read if you're interested in knowing a little more about forced induction, specifically in relation to turbochargers.

jEEd

theoritically yes, but if you stomp on it , it wont.