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Re: rpm range and fuel efficiency Posted by Saana88 [Email]  (#207)  [Profile/Gallery]
(more from Saana88) on Wed, 31 Jan 2007 15:58:27
In Reply to: rpm range and fuel efficiency, blue saab, Wed, 31 Jan 2007 13:36:52 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Your engine speed is only half of the story. The majority of the rest is engine load, since with the manual you can be at a slow engine speed and still have the gas pedal all the way down. If you're crazy like I am, get a turbo gauge from a junkyard car and install it in your non-turbo. If all is well you'll never go into the boost range, but the vacuum part of the gauge gives you a direct reading of how much load the engine is experiencing.
I'm always surprised how my father's car (those other Swedes) seems to clear 3000 RPM every half mile or so. I guess when you've got 200 horsepower in a heavy box (in its defense it does a great job hauling cargo) you don't care about such things.
I like to believe that the green range on the tachometer was developed for 8 valve engines since 16 valves were only in testing when that tach came on the market. This doesn't apply for 1992-93 900s that got a different instrument graphic.
What kind of mileage are you getting? What year and model 900 do you have? I can give some more specific pointers after that.
, Fri, 2 Feb 2007 21:53:42, Wed, 31 Jan 2007 15:58:27 <-- Viewing This Message
, Wed, 31 Jan 2007 22:15:00
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