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Registered
Join Date: Feb 2004
Location: Stoney Creek, Ontario
Posts: 88
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Using Gunson CO Tester
I recently purchased a Gunson CO tester and want to make sure I'm using it properly for testing my 83 911SC. The Cat has been replaced with a by-pass pipe.
JW says the optimum CO should be 3.5. Is this at idle or at a certain RPM. Should the test be done at idle? How about the O2 sensor? Should it be disconnected? Thanks in advance ............................... Randy
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83 911 SC Coupe ''Sunroof Delete'' Are we having fun yet ? |
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10-12-2004, 02:02 PM
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I set mine at 3.5% at idle. I do not run an O2 sensor.
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Walt 82SC 3.0 81SC 3.6 |
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10-12-2004, 02:20 PM
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Virginia Rocks!
Join Date: Oct 2003
Location: Just outside the beltway
Posts: 8,497
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You will also need a 1/4" outer diameter tube to get into the cat bung. I went to Home Depot and found some copper ice maker tubing that worked great.
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Rosewood 1983 911 SC Targa | Black 1990 944 S2 | White 1980 BMW R65 | Past: Crystal 1986 944 na Guards Red is for the Unoriginal
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10-12-2004, 03:49 PM
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Join Date: Feb 2004
Location: Stoney Creek, Ontario
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No need for the extra tube as I replaced the Cat with a by-pass. Readings can be taken directly within the tail pipe.
Randy
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83 911 SC Coupe ''Sunroof Delete'' Are we having fun yet ? |
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10-12-2004, 06:28 PM
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Join Date: May 2003
Location: Manhattan Beach, CA
Posts: 2,350
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Set the CO at about 1.5 to 2.0% before the CAT without the O2 sensor connected
with the RPM at 2000 to 2500. The 3.5% is a little too rich for the SC with CIS injection.
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Have Fun Loren Systems Consulting Automotive Electronics '88 911 3.2 '04 GSXR1000 '01 Ducati 996 '03 BMW BCR - Gone |
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10-12-2004, 11:09 PM
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