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The Terminator
Exhaust
03 Cobra observation-bad cats-please read.
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<blockquote data-quote="RED '03" data-source="post: 119147" data-attributes="member: 3582"><p>There is no way the A/F ratio is 9:1. If this was intentional these things wouldn't make crap for power. 10:5 or 11:1 is the richest you can run before the power drops off like a rock not to mention the bore wash problem you will have, meaning shot bores and blue smoke out the tail pipe in 10K miles. The reason for running rich is to keep exh valve durability and keep the cats from overheating. Your best ratio is normally around 12:1 for peak numbers as the fuel helps cool the inlet charge vs the stoich setting.</p><p></p><p>Also they program the a/f and spark curves for worst case scenarios... as the engine gets older the carbon deposits increase compression ratio and insulate the combustion chamber so the knock sensitivity goes up with mileage and don't forgot those that deal with high inlet temps. With the blower you guys know what too much spark and too lean will do - preignition.</p><p></p><p>It's been a while but I an trying to remember what I used to know or maybe what I don't.</p></blockquote><p></p>
[QUOTE="RED '03, post: 119147, member: 3582"] There is no way the A/F ratio is 9:1. If this was intentional these things wouldn't make crap for power. 10:5 or 11:1 is the richest you can run before the power drops off like a rock not to mention the bore wash problem you will have, meaning shot bores and blue smoke out the tail pipe in 10K miles. The reason for running rich is to keep exh valve durability and keep the cats from overheating. Your best ratio is normally around 12:1 for peak numbers as the fuel helps cool the inlet charge vs the stoich setting. Also they program the a/f and spark curves for worst case scenarios... as the engine gets older the carbon deposits increase compression ratio and insulate the combustion chamber so the knock sensitivity goes up with mileage and don't forgot those that deal with high inlet temps. With the blower you guys know what too much spark and too lean will do - preignition. It's been a while but I an trying to remember what I used to know or maybe what I don't. [/QUOTE]
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03 Cobra observation-bad cats-please read.
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