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SVTPerformance's Chain of Restaurants
Road Side Pub
Epa seeks to prohibit conversion of vehicles into racecars
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<blockquote data-quote="DHG1078" data-source="post: 15193065" data-attributes="member: 65442"><p>There is a bit that goes into it that I don't understand fully, but the basic premise (from what I understand) lies in the timing. Aftermarket tuning moves timing further away from when the exhaust valve opens, which reduces the temperature of the exhaust gas enough by the time it reaches the cats to make a difference in emissions. Retarded timing can actually burn more of the fuel, and late enough in the cycle that the gases are still at a high enough temperature to increase the effectiveness of the cats. The fuel is just burned late enough in the cycle it just doesn't help much hp wise.</p><p></p><p>So if you change the timing, you technically need to have the car approved for emissions.</p></blockquote><p></p>
[QUOTE="DHG1078, post: 15193065, member: 65442"] There is a bit that goes into it that I don't understand fully, but the basic premise (from what I understand) lies in the timing. Aftermarket tuning moves timing further away from when the exhaust valve opens, which reduces the temperature of the exhaust gas enough by the time it reaches the cats to make a difference in emissions. Retarded timing can actually burn more of the fuel, and late enough in the cycle that the gases are still at a high enough temperature to increase the effectiveness of the cats. The fuel is just burned late enough in the cycle it just doesn't help much hp wise. So if you change the timing, you technically need to have the car approved for emissions. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Road Side Pub
Epa seeks to prohibit conversion of vehicles into racecars
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