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Boost Issues
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<blockquote data-quote="XP900" data-source="post: 16631636" data-attributes="member: 199546"><p>Update.....</p><p>Still low on boost...</p><p></p><p>Ordered new belt - old one has 10K but looks clean with no dust anyway and no cracks....tight with tensioner (< 10K on both) and 90mm VMP idler on 2.5 pulley - Gen2R</p><p></p><p>At idle I have 18-21 in Hg vac,,,appears normal with no leaking and steady (changes slightly with engine rpm as AC clutches)</p><p>Boost bypass valve had 19 - 21 when I was measuring the line going to it. Tested bypass with Mighty VAC with throttle body removed to see movement.</p><p>I saw it start to open at 5 inches and all the way open at full vac. With no vac it is tightly closed by spring. I had ordered a new boost bypass but wasted my money...spare unit for future. Checked SC oil too - clean and at correct level.</p><p></p><p>Engine heat not a problem....even cold I have lower boost with low temp IATs.</p><p></p><p>So my options are getting really limited. I think boost pressure readings are purely mechanical...meaning I should have close to the same boost readings regardless of any timing issues even if some existed. I don't think my CATS are clogged...only 5K on them and if anything I would think it would up my boost.</p><p></p><p>So if the belt is not slipping, the only other think I can think of is the supercharger itself. I'll change my belt in the morning,,,,Gates racing belt to replace the Gates Micro-V belt on it now. I'll be shocked if it changes anything.</p><p></p><p>Any other ideas??</p><p></p><p></p><p>One more thing....when I turned my engine off (even after running only a few seconds) I hear a WISHHH sound....like air / vacuum from a canister...Is there a vacuum release mechanism that opens up when the engine power is shut?? it sounds like it is coming from the drivers side...possibly the air mechanism near the strut tower......is that for vacuum operated controls in the dash??</p></blockquote><p></p>
[QUOTE="XP900, post: 16631636, member: 199546"] Update..... Still low on boost... Ordered new belt - old one has 10K but looks clean with no dust anyway and no cracks....tight with tensioner (< 10K on both) and 90mm VMP idler on 2.5 pulley - Gen2R At idle I have 18-21 in Hg vac,,,appears normal with no leaking and steady (changes slightly with engine rpm as AC clutches) Boost bypass valve had 19 - 21 when I was measuring the line going to it. Tested bypass with Mighty VAC with throttle body removed to see movement. I saw it start to open at 5 inches and all the way open at full vac. With no vac it is tightly closed by spring. I had ordered a new boost bypass but wasted my money...spare unit for future. Checked SC oil too - clean and at correct level. Engine heat not a problem....even cold I have lower boost with low temp IATs. So my options are getting really limited. I think boost pressure readings are purely mechanical...meaning I should have close to the same boost readings regardless of any timing issues even if some existed. I don't think my CATS are clogged...only 5K on them and if anything I would think it would up my boost. So if the belt is not slipping, the only other think I can think of is the supercharger itself. I'll change my belt in the morning,,,,Gates racing belt to replace the Gates Micro-V belt on it now. I'll be shocked if it changes anything. Any other ideas?? One more thing....when I turned my engine off (even after running only a few seconds) I hear a WISHHH sound....like air / vacuum from a canister...Is there a vacuum release mechanism that opens up when the engine power is shut?? it sounds like it is coming from the drivers side...possibly the air mechanism near the strut tower......is that for vacuum operated controls in the dash?? [/QUOTE]
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