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Old 03-07-2006, 09:44 PM
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low vacuem at lower rpm or higher vacuem at higher rpm

driving my volvo around (it has a boost guage) i have noticed that i can have it in a lower gear spinning at about 3000 rpm my little four banger will pull a higher vacuem number than if i let it shift, which puts it at a lower vacuem(more load) but at a lower rpm. unfortunatly i dont have any hard vacuem numbers (volvo's boost guage's dont have numbers) but in theory which would be better for economy?
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Old 03-08-2006, 08:02 AM
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Keep the vacuum as high as possible at all times when in high gear. As far a shifting goes, -again keep the vacuum as high as possible by accelerating slowly but shift as early as possible without lugging the engine, -say as soon as you can maintain ~2/3 of the normal idle vacuum level on the gage after shifting. Without driving your car and watching the gage I can't give you any better advice. Keep out of the boost area!!! Unless you have as much fun occasionally as I do when driving my son's turbo Mitsubishi.
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Old 04-04-2006, 11:20 PM
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Quote:
Originally Posted by muscletruck7379
driving my volvo around (it has a boost guage) i have noticed that i can have it in a lower gear spinning at about 3000 rpm my little four banger will pull a higher vacuem number than if i let it shift, which puts it at a lower vacuem(more load) but at a lower rpm. unfortunatly i dont have any hard vacuem numbers (volvo's boost guage's dont have numbers) but in theory which would be better for economy?
Since your Volvo is boosted, your vacuum readings are not exactly like an average normally aspirated engine. But as a general principle, it is more economical to use a higher gear at a wide throttle opening than a lower gear with a smaller throttle opening at a given speed. That said, once you determine the proper gear for the circumstance, the higher vacuum reading is of course the most economical.
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Old 04-04-2006, 11:20 PM
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