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Old 02-06-2013, 08:18 PM   #26 (permalink)
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Join Date: Oct 2012
Location: Warren, Ohio
Posts: 17

Guido - '12 Fiat 500 Pop
90 day: 39.64 mpg (US)

Petey - '98 Porsche Boxster
90 day: 23.91 mpg (US)
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Originally Posted by _MADMIKE_ View Post
Going to try to improve on the improbable.
1987 Oldsmobile Cutlass one of the last of RWD body on frame midsize V8 coupes.
140 odd horsepower of smogged to death goodness pushing ~3500lbs
It may be a hopeless challenge but someones got to try

The good.
Fairly sleek body design, can easily reach triple digit speeds.
The bad.
Whoever thought an electronic carbuerator was a good idea needs their head examined.
The ugly.
Can you believe GM stuck 2.14:1 final drives in these cars. 0-60 with a sun dial, but cruising with traffic and the tach staying well below 2Krpm always gives me a fuzzy feeling.

Original EPA was 17/23, revised is 15/21. Is 18/25 too far off, maybe 20/27.
Lets trim some weight off this piggy and see what she can do.
Should be easy to do. Start with all the easy, free stuff first. Document changes and FE reading per change. Slightly narrower, taller tires with high pressures work wonders. Good tune up and timing the engine for economy, if possible. A carb rebuild (and re-jet if possible), or a smaller carb, or a Holley aftermarket TBI setup that's programmable. better flowing intake, and exhaust.
Even with the clutch fan, there still is a parasitic drag from it.

Lower rolling resistance, less frontal area, and less RPM will be the ticket... always. Good luck! I'm anxious to see the results. I am highly considering buying a 77 GranPrix again.. (after all these years)...Just to see what we can milk out of it FE speaking.
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