Hi Flow or Stock Cat to restrictive for daily driving
11-02-04, 12:26 PM
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Hi Flow or Stock Cat to restrictive for daily driving
I am gonna weld a cutout into my hi flow cat so when i want to get on it I can, but for daily driving will the high flow cat be too restrictive?
I am runing a 40R kit and etc...
I am runing a 40R kit and etc...
11-02-04, 04:17 PM
#2
I hope not, as I plan to run a high flow cat with my R85 setup, too. I haven't gotten my car back yet to see how it works, though. I would have to think that some cat should flow enough to allow cleaner, quieter motoring without killing the power too badly. I have an N-Tech cat that seemed to flow reasonably well (based on unscientific butt-dyno experiences) when I was running it with the twins before. That is what I am going to try with my new setup. If that is too small, I will try the biggest high flow cat that I can get from Magnaflow or Dynomax or whoever. Or maybe one of those new metal cats that people have been using.
I did see a dyno test in a Mustang magazine where ceramic, metal, and test pipes (in twin 2.5" config for the V8, I think) were compared. The known high-flowing ceramic cats (the ones they chose were known to be good in the Mustang community) and the metal cat were about the same and the test pipe was only a little bit better. I think the difference was something like 10RWHP higher for the test pipe on a 400RWHP car in that case. I don't remember the exact details, but my impression was that you should be able to run a cat without losing a lot of power.
-Max
I did see a dyno test in a Mustang magazine where ceramic, metal, and test pipes (in twin 2.5" config for the V8, I think) were compared. The known high-flowing ceramic cats (the ones they chose were known to be good in the Mustang community) and the metal cat were about the same and the test pipe was only a little bit better. I think the difference was something like 10RWHP higher for the test pipe on a 400RWHP car in that case. I don't remember the exact details, but my impression was that you should be able to run a cat without losing a lot of power.
-Max
11-02-04, 04:24 PM
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What about just for daily driving, it shouldn't affect the car, by leaning it out burning the plugs... I don't car about anything like performance for daily driving...
11-02-04, 04:51 PM
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Get the new metal cats, they do flow better and work better that most ceramic cats. Houston Motorsport Tech. swears by them on their 500+HP Corvettes. Only loosing about 10HP. But then that is 2 cats per engine.
11-02-04, 06:47 PM
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Originally Posted by CCarlisi
It will be too restrictive for daily driving, but fine for the track
I think the dump will do fine for the track
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