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SportTrac Discussion
Engine & Drivetrain
Exhaust system backpressure
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<blockquote data-quote="EddieS&#039;04" data-source="post: 965413" data-attributes="member: 61136"><p>Scott, The main cats will control NOX, HC and CO. I cant give the documentation for the trac. My first car With OBD2. Previous cars. OBD 1 without the pre-cats. Got the same readings without them. On the dyno and sniffer. Previous obd 1 fords of mine, had the 3ways with air injection. For example if I order today a dual y-pipe from any other parts store than ford, in texas. They sell you a Non pre-cat, with main cats only. Not CARB approoved, 49 state only.</p><p></p><p></p><p></p><p>I compared my older obd1 test after I done away with pre-cats. The readings were the same. One test on my '94 stang. All my readings were lower. I had the bassani cat-x, with mains only.</p><p></p><p></p><p></p><p>Once the place I go. Had some sort of link up problem with the state. My trac has the rt-ypipe. No pre-cats. They did the dyno sniff. The numbers came in below tolerance. I think it is how well your motor is tuned.</p><p></p><p></p><p></p><p>One more example. A freind had an older lighting with the 351W motor. After going installing long tube headers. He stagered 2 mufflers and dumped at the side. No cats at all. He had it sniffed to see if he needed cats. His numbers came in below tolerance. Go figure..LOL</p></blockquote><p></p>
[QUOTE="EddieS'04, post: 965413, member: 61136"] Scott, The main cats will control NOX, HC and CO. I cant give the documentation for the trac. My first car With OBD2. Previous cars. OBD 1 without the pre-cats. Got the same readings without them. On the dyno and sniffer. Previous obd 1 fords of mine, had the 3ways with air injection. For example if I order today a dual y-pipe from any other parts store than ford, in texas. They sell you a Non pre-cat, with main cats only. Not CARB approoved, 49 state only. I compared my older obd1 test after I done away with pre-cats. The readings were the same. One test on my '94 stang. All my readings were lower. I had the bassani cat-x, with mains only. Once the place I go. Had some sort of link up problem with the state. My trac has the rt-ypipe. No pre-cats. They did the dyno sniff. The numbers came in below tolerance. I think it is how well your motor is tuned. One more example. A freind had an older lighting with the 351W motor. After going installing long tube headers. He stagered 2 mufflers and dumped at the side. No cats at all. He had it sniffed to see if he needed cats. His numbers came in below tolerance. Go figure..LOL [/QUOTE]
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SportTrac Discussion
Engine & Drivetrain
Exhaust system backpressure
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