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Message: [QUOTE="Tree Trimmer, post: 1025225, member: 716"] the only thing i will kind of add, is dont check just for pressure or vacuum in the line, and use that to determine if it's flowing. you also need to check for actual flow during your testing. a slight vacuum, while yes its flowing in the correct direction, might not be flowing enough, and raise crank pressure anyways. that is what we found when we were testing for the one we made for our last gasser. we wanted a very slight negative pressure in the case, and we were suprised how slow the response time was in a 1" hose that was 4ft long, and again in a 1/2" hose. and lastly, you need to do your testing at various rpm's as well. while at 5-6k we had our vacuum, at 3k we had zero, neither positive or negative, and at idle/low speed cruising we had a slight pressure. you'll end up playing with hose size, nipple angle, and nipple protrusion into the exhaust to get it right at all rpm's. and in your testing data, you will also need to moniter exhaust pressure POST turbo, where your putting your nipple, as that will also affect your data. this is what we found when we put one in my old 7.3 just throwing that out there [/QUOTE]

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