Quote:
Originally Posted by Vman455
I'm curious what we are to make of the efficiency increase with the initial round of aeromods, before the kammback and tail were added. 15% improvement with wheel covers, grill blocks, mirror delete, etc; then the tail did hardly anything. Is it possible Metro just happened to hit a plateau in engine efficiency?
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We're kinda at a point where we'd need a laboratory and an engine map for Metro's car.
We can speculate for ever.The science says we're looking at a BSFC problem.This dates at least to 1934,with the Chrysler DeSoto aerodynamic test mule based upon the Airflow.They are the first to report on the problem.Dr. Gino Sovran of GM Labs and SAE published a paper reflecting on the problem.Ditto Wolf Heinrich Hucho.
Unless the engine can be shifted back to it's original BSFC it doesn't matter how much we reduce rolling resistance or aerodynamic drag.We're gonna be facing this demon."Gear-matching" has historically been the solution to the problem.
Whatever rpm occurs at the original top speed,gear the streamlined car to be at exactly the same rpm at it's new higher top speed.
