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SVTPerformance's Chain of Restaurants
Tuning À la carte
Turning off the temp protection switches
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<blockquote data-quote="decipha" data-source="post: 16708479" data-attributes="member: 74327"><p>Most tuners turn them of cuz they dont understand how they work since they dont have access to all of the controls for it.</p><p></p><p>In short, flange, cat and o2 overheat protection just enrich fuel to cool the exhaust. You can see it as commanding a rich decel after wot or even commanding rich while cruising after a while. You can even hit it at wot when it commands overly enriched fuel as well in some cases.</p><p></p><p>You can kick up the temp at which protection kicks in as well as lean out the enrichment for it too in some commerical software like sct.</p><p></p><p>As long as mbt spark is calculated correctly and the tunes fueling isnt scaled or if the exotherms are scaled to suit then it should infer exhaust temps pretty accurately. </p><p></p><p>Any exhaust changes or modifications that affect spark advance or exhaust flow will alter the calculations. Most tuners just disable them since they dont have access to all the parameters to adjust it correctly and even if they did wouldnt know how to compensate correctly since there arent any models for long tubes and larger pipes, etc... since there are no known models (being that there are no factory long tube options).</p></blockquote><p></p>
[QUOTE="decipha, post: 16708479, member: 74327"] Most tuners turn them of cuz they dont understand how they work since they dont have access to all of the controls for it. In short, flange, cat and o2 overheat protection just enrich fuel to cool the exhaust. You can see it as commanding a rich decel after wot or even commanding rich while cruising after a while. You can even hit it at wot when it commands overly enriched fuel as well in some cases. You can kick up the temp at which protection kicks in as well as lean out the enrichment for it too in some commerical software like sct. As long as mbt spark is calculated correctly and the tunes fueling isnt scaled or if the exotherms are scaled to suit then it should infer exhaust temps pretty accurately. Any exhaust changes or modifications that affect spark advance or exhaust flow will alter the calculations. Most tuners just disable them since they dont have access to all the parameters to adjust it correctly and even if they did wouldnt know how to compensate correctly since there arent any models for long tubes and larger pipes, etc... since there are no known models (being that there are no factory long tube options). [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
Turning off the temp protection switches
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