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Originally Posted by Howerton Engineering
We have found the same inconsistencies in getting to the click, but the running pressure results seem much more reliable. It should give a running pressure about 160psi(at 100% IDC) with one turn back.
How much is your pressure gauge moving? Try pulling the jet from the car and putting the test jumper on and spraying at 100% as this will hold open the FCM and possibly give you better reading. We usually measure running pressure at the FCM inlet but that shouldn't make a big difference.
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I think the issue is that the pump vibrates when it is on. I should consider moving the gauge to the FCM, but it's all nicely tucked away - I can just look down through the engine bay and read the pressure as it stands... If I turn the pump on at 100% test and then turn the system off from the gauge, I think the pressure should remain constant, correct? Using this method (prior to calibration), I got a reading of 120 psi. I haven't tested yet after fiddling with this set screw. Will report back...