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Old 09-05-2008, 03:45 PM   #1
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Default Olderguy O2 clamp pressure switch adjust

From the instructions:

The pressure switch, if supplied, is set at its' minimum setting(approximately .5 psi) It has an adjustable range to 4 psi.

i am waiting on a AFPR and a Wallbro255 to dump the Vortech and stock FPR. It will take a couple more weeks. In the meantime, due to the IC effectiveness, the Vortech can only supply enough fuel to deliver 11.5 AFR's when I reach 3PSI.

That means while progressing between 0-1-2 psi, I go lean, say 13.5 or higher. This takes only a second in high RPMs, but if I pull from low RPMs its a longer lean tip in and I dont want to take any chances.

So, I took out the vacuum line connecting to the pressure switch and blew into it while idling at 14.7. it takes aprox 4/5 seconds to go from 14.7 to 11.0
What I am thinking is to set it to kick in earlier, just to be safe untill the AFPR arrives.

If I bring the screw outside the casing surface can I set to start working in atmosferic pressure, or 0.5 psi is really the minimum setting as the instructions say?
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Old 09-05-2008, 04:27 PM   #2
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Backing it out a little above the housing will drop it to almost -0-, but it will not go below -0-.

The 4/5 seconds at idle is probably a combination of delay of the ecu reading the low voltage and the air column getting to the O2 sensor.
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Old 09-05-2008, 04:36 PM   #3
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thx Bruce, you mean while driving the clamp will be doing its work faster due to EG reaching the 02 sensor faster?

Last edited by mx5dude69; 09-05-2008 at 04:38 PM. Reason: mistake
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Old 09-05-2008, 05:36 PM   #4
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The clamp won't be working faster, but with a larger volume of exhaust, you will be reading it sooner.
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Old 09-05-2008, 06:32 PM   #5
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thx. not sure if it will help as my main problem is when flooring it at low rpms, but will try it. cant hurt.

thx again
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