i hope im getting up to speed here but i wanna check, will you get better mileage with exhaust and intake rather than a turbo or does neither help with mileage?
-sry if i sound stupid-

 

Yes, you get better gas mileage with an intake and exhaust as long as you don't drive like a maniac. With the turbo you will get better gas mileage as long as you are not in boost constantly. I'm sure someone will elaborate on all of this later and provide you with more info.

 

No, you usually do not get any mileage improvement out of intake/exhaust mods, because they are designed to improve high load and high rpm power at the cost of everything else.
Turbo, on the other hand, utilizes exhaust gas energy, which would have been wasted otherwise, and thus can help your mileage.

 

wow, i learned something, thats some good to know stuff.

 

I'm not so sure Misha. The added efficiency alone from IHE mods, though small, would show an increase in gas mileage. Not all IHE products are designed to improve top end power. Look at the header market. Most aftermarket headers are designed with long primarys and various inefficiencies (abrupt merging at the collector, nonsequial pairing of the primaries, poor welds, etc.) that make top end gains not plausible. All aftermarket exhausts show better high rpm gains than a header will over stock, but they'll all show gains down low as well since stock exhaust is so horribly inefficient. Intakes are usually designed from high rpm improvement, but from what I've seen normally don't show loses at low rpms either. Anyway, the point is, IHE will increase efficiency throughout the powerband, and therefore increase gas mileage at cruise rpms. Don't expect IHE to extend your torque curve more than a few hundred rpm though.

As for turbos improving gas mileage. The engine doesn't care one way or another what you do with it's exhaust gases. Actually, I would think the turbo itself acts as an impedance if anything to exhaust flow. What improves gas mileage with a turbo is the increased intake air temperature. Hot air atomizes fuel better.

 

first hand experience: adding an exhaust system and intake definitely improved my gas mileage. my travel turned out to be about 60 miles more per tank than before the mods. it varies per car though. that's just how it worked out for me. that's about 36mpg here.

 

my car has 185,000 miles with a turbo and im getting 38-40 mph between my town and the next. no highway

 

I'm quoting myself from another thread:

 

Do you mean to come off as a complete ****head? Or is that just an accident?

 

Not sure what *****head means...