When you are operating under zero boost conditions the turbo is not a
significant restriction.
The slight reduction in mpg under these conditions is more from the fact that
the engine has less static compression than the NA version of the engine than
any restriction the turbine housing imparts.
That being said I have had 4cyl turbo mopars continously since May 85 when I
took delivery of my first turbo Daytona. This car with a 5spd got 26-27 mpg
around town (suburban setting) and 32-33mpg on the hiway at 65-70mph. My next
one was a turbo 2 (an extra 25HP and 50ft-lbs) Shelby Daytona it too got
26-27mpg around town and 31-32mpg on the hiway. I added a MP computer to this
car along with a less restrictive exhaust. The more aggressive timing and
richer mixture cost me about 1 mpg on both ends.
My current turbo car is an 03 PT Cruiser, this is a much more powerful engine
than either of my Daytonas and I have an automatic too. It gets 22-23mpg around
town and about 25-26 on the hiway. Also, agressive driving with this car will
quickly drop the mpg down into the teens. Talking with folks that have NA
automatic PT's the turbo gets the same mileage.
Dave Clement
99 SLT+ CC 4x4
In article <b26be6d905082108544ad60bda@mail.gmail.com>, andy.levy@gmail.com
(Andy Levy) writes:
>
>
> On 8/21/05, Bill Knight <wknight40@comcast.net> wrote:
> >
> > Don't know the actual answer, but my opinion under normal/leisurely driving
> > a turbo should help since it require no power from the engine to increase
> > horsepower and torque. A supercharger on the other hand may help but maybe
> > not as much depending on engine since it requires a direct mechanical
> > connection to the engine.
>
> The turbo will increase the amount of work that is required to expel
> exhaust gasses. You know those MPG gains we get from running
> free-flowing exhausts? Reverse that when you put the turbo impeller
> in the exhaust stream. It's not *as much* of a drag as the
> supercharger, but you cannot get higher pressure in the intake
> manifold at zero cost, unless you have a solar-powered electric
> supercharger.
>
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