Quote:
Originally Posted by 3-Wheeler
Regarding the comment about the intake being a hindrance to fuel economy.
If you are truely driving for the best fuel mileage, with the engine running just past idle, then the intake would not be much of a factor.
On the other hand if you driving 75 mph on the highway and into a head wind, well there's not much that you can do to get good mileage at that rate. (hp= v^3 function)
Jim.
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Not to make too fine a point of it, if for no other reason than, as it turns out, the OP's car has already had the work done by his brother-in-law (and a cat back exhaust, too), it is sometimes amazing how restrictive the stock intake systems are on many vehicles. You would think that the manufacturers would place more emphasis on this area of design because of the potential for fuel economy gains, but it does not often appear to be the case.
My earlier estimation was that a gearing change should get the RPM for a 70 MPH cruise speed down to 2,500 to 2,600 RPM as compared to the reported 3,500 RPM at present. With the planned aero mods the OP may be able to run somewhat fewer RPM, but that is still enough for there to be some benefit to freeing up the intake and exhaust.
On the other hand, it is true that this is not a max horsepower situation.
Cheers