Quote:
Originally Posted by shadrach74
Are you guessing or have you seen data to support this? 18:1 is not really that lean in terms of efficiency ratios. I run a large displacement flat four with a fuel and ignition system far less sophisticated than those in our Porsches at efficiency ratios approaching that level. Some of the new direct injection engines run at 60:1 or more under certain conditions.
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Ummm, not if it's running gasoline. 18:1 is way to lean to be safe for full power applications and would not be making good hp numbers. I suspect the exhaust sensor was fouled. Ultra lean burn on direct injection motors is useful at idle or cruising down hill, not making max power on a dyno.
http://en.wikipedia.org/wiki/Gasoline_direct_injection
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
Last edited by Topless; 09-26-2012 at 06:21 AM.
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Lil Red
2009 Porsche Cayman 2.9L
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