catty's needed??
#7
its stupid to not run one, lets say you dont care about killing all of us and the planet..... it makes your truck throw engine codes, and doesnt let it run right.... and beside modern cats are hi flow so there is no reason not to run one.... and basically unless it is a purebred racecar, the assumed performance gains really isnt much if any, it might even hurt the performance
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#8
oh yeah, it is federal alw as well, jsut because your state doesnt inspect for it, doesnt mean that you dont have to have one, all cars sold and run on us roads must have them epr DOT
#10
Originally Posted by jimabena74
oh yeah, it is federal alw as well, jsut because your state doesnt inspect for it, doesnt mean that you dont have to have one, all cars sold and run on us roads must have them epr DOT
I know when I put my long tube headers on my Dakota R/T 5.9L and removed the 2 precats and the main cat, it sure liked it. I used an o2 Simulator box to trick the PCM into thinking the cats were their. It generated the correct voltage signal to the pcm thus no codes. I ran a single 3.5" exhaust off the headers and the 5.9L could finally breath. Got me 4 tenths in the 1/4 mile and 4 mph.
I noticed that some people wonder why the Supercharged V-8 Toyotas don't make the power that everyone thinks they should . It's mostly due to all the restrictions in the exhaust... i.e. CATS. High flow or not.... the more restrictions you add, the less power you will make, especially when your trying to force more air in. Putting 3 or 4 cats and a MUFFLER on a V-8 exhaust system is like trying to breath through a straw the rest of your life... you would make a lot of power either...
Last edited by kenandjenn; 09-18-2004 at 01:00 PM.
#11
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I didn't run a cat for years, I thought it was a big power robber, then I got busted on my state inspection, I put a freeflow cat on at $90, no difference and now I'm legal!
#13
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Location: Ashland, Ohio
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the only plus from sawing my catty off is that the old beast takes off a little quicker, but other than that, no difference, good or bad. But, to make all of you happy, I'll put one on. Any suggestions on a nice, quiet exhaust that will let my 3.0L breathe??
#17
Originally Posted by nunsa
I didn't run a cat for years, I thought it was a big power robber, then I got busted on my state inspection, I put a freeflow cat on at $90, no difference and now I'm legal!
Proper Backpressure for your application is the key in any exhaust setup. Big blocks, high h.p. Small blocks, and supercharged/Turbo setups all need to breath.
Gotta think how much power old school engines made though ... LS7, 426 Hemi, 427, etc. They made it with a Carb, pushrods, and 2 valves per cylinder. Very low tech now days
Emissions have really killed the true power any engine can make. Auto Makers have and will continue to have to dig deep to find ways to make power as emissions get tougher and tougher.
When Cats first started being, vehicles only had one.... now some have 3-4 plus a Resonator and muffler.
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