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| Does anybody have vacuum diagrams for a 225 w/EGR? https://slantsix.org/forum/viewtopic.php?t=30208 |
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| Author: | SlantSixDan [ Tue Jun 02, 2009 9:36 pm ] |
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Your sources don't support your assertion. |
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| Author: | emsvitil [ Wed Jun 03, 2009 12:43 am ] |
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BSFC = Brake Specific Fuel Consumption http://www.autospeed.com/cms/A_110216/a ... larArticle Quote: Your sources don't support your assertion.
Really..............first link http://www.autospeed.com/A_110577/hDg34 ... ticle.html "EGR for Fuel Economy Improvements".... mentions my first point.... Can't find source for second point........ |
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| Author: | SlantSixDan [ Wed Jun 03, 2009 8:53 am ] |
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Yes, really. There are some unsupported assertions on a theoretical reduction in pumping loss due to EGR, a pointer (but no reference) to an SAE paper the title of which suggests potential fuel economy improvement by dint of EGR in a turbocharged engine, and then there's a wholly unscientific fuel economy "test" consisting of driving around and varying EGR valve behavior. The latter yields an apparent change from 3.1 to 3.0 litres per 100 km, a 3.3% apparent improvement which may or may not be significant and may or may not actually have happened. Back-to-back drives around on a street route, no matter how carefully one tries to keep everything constant, is not even close to precise enough to discern small fuel economy changes. There are far too many variables when a human's behind the wheel in traffic — definitely more than enough to swing the fuel economy far more than was observed — so assuming the observation is significant and valid and attributing it to a change in the EGR volume is specious and not supportable. There are sound and valid ways of testing ideas like this. Perhaps someone has done it, or will do it. But what you've pointed at just doesn't cut it. |
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