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SVTPerformance's Chain of Restaurants
The Blower Bistro
Boost loss
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<blockquote data-quote="JGDogg10" data-source="post: 16692076" data-attributes="member: 140380"><p>Well, after tearing shit apart and putting it back together a bunch of times I randomly found what was going on… I thought maybe my blow off valve was getting a greater pressure differential from the psi between the blower and intercooler and what was being fed from the vacuum source off the intake manifold. Just to try and stiffen up the spring for testing I took the blow off valve apart and added two washers under the spring, put it back together and the car would barely make 2 pounds of boost. Frustrated, I took the blow off valve back apart and looked at how it operated inside. The source line comes in through the top, and then feeds two small holes that lead to the diaphragm and the back of the valve. I originally switched my fitting on top of the blow off valve from a banjo bolt to a AN fitting to clean things up, so I thought about switching back to the banjo bolt and when I removed the AN fitting from the top of the blow off valve I saw that it had about an inch of threads going inside the blow off valve. So I screwed the AN fitting back all the way in and blew on that fitting and realized the air was barely getting through the two small holes to the diaphram to hold it down while under boost. I unscrewed the AN fitting all the way up until the bottom of the threads was flush under the blow off valve (not sticking down and inch inside it) and blew on the fitting and a ton of air was going through those two passages onto the diaphram. So I took my fitting and cut off about 3/4 of the threads, popped some Teflon on them and screwed the fitting in. Hooked all the lines back up and just took it for a drive! And sure enough the car is hitting 20+ pounds of boost in 3rd gear!! Car pulls way harder throughout the gears and the supercharger even sounds better while driving.</p><p></p><p>Bottom line, the length of threads on the fitting were restricting air to the blow off valve diaphram, not providing the correct amount of counter pressure to fully shut the valve after about 14-15psi!</p><p></p><p>It’s funny how you sometimes just happen to stumble on the answers to your problems by actually taking three time to LOOK at shit hahaha</p></blockquote><p></p>
[QUOTE="JGDogg10, post: 16692076, member: 140380"] Well, after tearing shit apart and putting it back together a bunch of times I randomly found what was going on… I thought maybe my blow off valve was getting a greater pressure differential from the psi between the blower and intercooler and what was being fed from the vacuum source off the intake manifold. Just to try and stiffen up the spring for testing I took the blow off valve apart and added two washers under the spring, put it back together and the car would barely make 2 pounds of boost. Frustrated, I took the blow off valve back apart and looked at how it operated inside. The source line comes in through the top, and then feeds two small holes that lead to the diaphragm and the back of the valve. I originally switched my fitting on top of the blow off valve from a banjo bolt to a AN fitting to clean things up, so I thought about switching back to the banjo bolt and when I removed the AN fitting from the top of the blow off valve I saw that it had about an inch of threads going inside the blow off valve. So I screwed the AN fitting back all the way in and blew on that fitting and realized the air was barely getting through the two small holes to the diaphram to hold it down while under boost. I unscrewed the AN fitting all the way up until the bottom of the threads was flush under the blow off valve (not sticking down and inch inside it) and blew on the fitting and a ton of air was going through those two passages onto the diaphram. So I took my fitting and cut off about 3/4 of the threads, popped some Teflon on them and screwed the fitting in. Hooked all the lines back up and just took it for a drive! And sure enough the car is hitting 20+ pounds of boost in 3rd gear!! Car pulls way harder throughout the gears and the supercharger even sounds better while driving. Bottom line, the length of threads on the fitting were restricting air to the blow off valve diaphram, not providing the correct amount of counter pressure to fully shut the valve after about 14-15psi! It’s funny how you sometimes just happen to stumble on the answers to your problems by actually taking three time to LOOK at shit hahaha [/QUOTE]
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Boost loss
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