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monkeyboy |
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#1
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Senior Member ![]() ![]() ![]() Group: Members Posts: 808 Joined: 8-June 08 From: Los Angeles, Ca Member No.: 9,147 Region Association: None ![]() |
I am installing an AFR meter to help me jet my carbs. Everything on the car is stock but the carbs. Since there really is no collector on the stock exhaust, where should I mount the O2 sensor for a decent reading?
Any suggestions? |
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nathansnathan |
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#2
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Senior Member ![]() ![]() ![]() Group: Members Posts: 1,052 Joined: 31-May 10 From: Laguna Beach, CA Member No.: 11,782 Region Association: None ![]() |
I tried to figure it out and learned a bit from a thread on thesamba, a guy trying the same on his bug.
http://www.thesamba.com/vw/forum/viewtopic...asc&start=0 The best bit QUOTE tzepesh wrote: I would say that correct results can be obtained only by placing the lambda probe after all pipes merge into one. I had some problems with mounting the probe in the exhaust pipe of only one cylinder, because it would have correct reading in only one of the 4 strokes (exhaust stroke). The other 3 strokes would lead to showing a lean condition, because the gas flows towards the muffler and it would cause a void. If the probe is placed after the merged pipes, it will get a continuous flow of exhaust gas, thus a correct reading. -which means my 4 bung idea won't work, I think. The consensus there is to use an extension fitting over the exhaust as that's the only place the 4 have come into 1 that can be accessed, but it needs to be extended to prevent false reading from air being drawn in. The only such thing I could find is one on the bottom of this site http://bugpatch.com/VWToolsCatalog/VWTools...79/Default.aspx but it would be small as it's for a bug. I'f you've got the center exit early tailpipe maybe that would work on its own? |
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