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John M
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Test Pipe or CAT???
Just curious if I yank the Cat and replace with Test Pipe, what will I notice??? O2 is disconnected anyway. I have a Dual Out Sport Muffler. Thanks. John
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"I Can't Drive 55!! |
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10-10-2004, 11:07 AM
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Join Date: Sep 2001
Location: Kerrville, Texas
Posts: 1,021
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Mine has a deepre exhaust tone but can't tell if I'm getting any extra hp without dyno. I took it off to lower the temp on that side of the engine. It gets hot down here.
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1987 911 Guards Red Targa, nearing 200,000 miles, lowered, 7's & 8's, 964 grind cams from John Dougherty, A.P.E. Mass Flow Sensor with chip to match, cat bypass, strut brace, dual out muffler. Will consider newer model in 8 years when I turn 75 and then maybe not. 2012 BMW 528i (wife's) 2007 Toyota FJ (rain and off road days) |
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10-10-2004, 11:29 AM
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I think it depends on what you replace the cat with.
You mention a "test pipe" I don't think these provide as much benefit as a euro cat bypass. I have a Fabspeed bypass pipe that is very simliar to the euro bypass. I noticed a little bit more noise and a little bit more power. Would I do it again? Yes. I have a RUF sport single in dual out FWIW. -Jeff nolift911@hotmail.com |
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10-10-2004, 11:30 AM
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Go Speedracer, go!
Join Date: Aug 2002
Location: Indianapolis
Posts: 1,951
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I have a euro premuffler as well. It is hooked up to a Bursch. It drones a little bit between 2500 to 3000 rpms. It is supposed to gain more HP than a test pipe since it is tuned to the exhaust system. I can't really tell though.
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1981 SC ROW Coupe |
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10-10-2004, 11:33 AM
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Location: San Diego, CA
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After a ton of research (on this site), I went with a euro-type cat bypass because it gives the slight backpressure needed to outperform test-pipes in adding horsepower (the testpipes supposedly add none). What I really wanted though was to run a bit cooler and not ruin my cat with my richer than stock fuel mix.
HP? Maybe a touch, but nothing significant. Noise? A *little* deeper and louder Temp? Id guess it runs 10 degrees cooler over the cat. I bought mine on ebay and have seen them there fairly often Cheers! Patrick
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82 911SC Wine Red 94 300ZXTT |
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10-10-2004, 11:49 AM
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Join Date: Mar 2002
Location: lake havasu city az
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If your looking for a test pipe I have one from a 83 SC with about 50 miles on it with O2 bung in it, in the orignal box It belongs to the guy next door $80+ shipping email me if you are interested gregkone@yahoo,com
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65 911/ 301274 sold 66 911 /303509 sold 67 911/ 355032 68 911 softie sold 70 T with s trim |
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10-10-2004, 12:22 PM
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Join Date: Oct 2000
Location: agoura hills, ca 91301
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Quote:
I can't seem to get an answer to this question...." Will richer than stock mix burn the cat? Is this true? Has it been proven?" Thank you all! |
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10-10-2004, 05:55 PM
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Join Date: Jan 2004
Location: Richmond,Va
Posts: 916
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Yes it's proven and a common problem that occured on all types of cars when cat.-converters were first introduced. A rich fuel mix would melt the core together inside the converter. By design the they heat up to burn off some un wanted emmisions.
One example was the 20 year old volvos that used to have a test port that you could unplug to check if it was melted down. I remember unplugging them to see if that would fix a running problem under load or accelerating. I'm sure it was originally designed to hook up a pre and post sniffer for tuning but, it was handy to see if the cat-conv. had melted down.
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Harold 
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10-11-2004, 07:34 AM
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1987 Porsche 911 3.2 Sold 2006
Boxster S
