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<blockquote data-quote="402" data-source="post: 15008177" data-attributes="member: 174119"><p>You basically nailed it but haven't put two and two together yet.</p><p>Big Qs car has 8 pound spring in the wastegates. Bottom of the wastegates are referenced to manifold. This is to achieve 8 psi in the manifold regardless of what the turbo is making. What i found so far is just like you said a MAJOR pressure drop through the coldside. When i was commanding the wastegates to make 8 psi in the manifold at 6000 rpm i was seeing 13.5 psi at the turbo cover. A typical street turbo kit will be 2:1 backpressure to boost. That means at 6000 rpm i am roughly 27 psi back pressure at only 6000rpm with 8 psi in the manifold. I have not tested it higher yet but looking at the chart the drop will continue its trend and could possibly be making 15 psi to achieve 8 psi in the manifold. That means is its ONLY 2:1 ratio there is 30 psi of backpressure if not more... NO stock valve springs will support that without losing control and floating.</p><p>Once we see 8psi in the manifold and 8-9 psi at the cover the backpressure will only be 16 psi IF that. Then this car/kit will be making power and wont see the backpressure issues or at least not on a stock engine or until some serious power levels.</p><p></p><p></p><p>This is the dyno chart. Second from the bottom in black is manifold, Bottom is in red...</p><p></p><p>Take that red line and at least double it, that is the current backpressure in the system assuming it's only a 2:1 backpressure to boost. </p><p></p><p><img src="https://flic.kr/p/xtUmYy" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><a href="https://flic.kr/p/xtUmYy" target="_blank">https://flic.kr/p/xtUmYy</a></p><p>[ATTACH]50432[/ATTACH]</p></blockquote><p></p>
[QUOTE="402, post: 15008177, member: 174119"] You basically nailed it but haven't put two and two together yet. Big Qs car has 8 pound spring in the wastegates. Bottom of the wastegates are referenced to manifold. This is to achieve 8 psi in the manifold regardless of what the turbo is making. What i found so far is just like you said a MAJOR pressure drop through the coldside. When i was commanding the wastegates to make 8 psi in the manifold at 6000 rpm i was seeing 13.5 psi at the turbo cover. A typical street turbo kit will be 2:1 backpressure to boost. That means at 6000 rpm i am roughly 27 psi back pressure at only 6000rpm with 8 psi in the manifold. I have not tested it higher yet but looking at the chart the drop will continue its trend and could possibly be making 15 psi to achieve 8 psi in the manifold. That means is its ONLY 2:1 ratio there is 30 psi of backpressure if not more... NO stock valve springs will support that without losing control and floating. Once we see 8psi in the manifold and 8-9 psi at the cover the backpressure will only be 16 psi IF that. Then this car/kit will be making power and wont see the backpressure issues or at least not on a stock engine or until some serious power levels. This is the dyno chart. Second from the bottom in black is manifold, Bottom is in red... Take that red line and at least double it, that is the current backpressure in the system assuming it's only a 2:1 backpressure to boost. [IMG]https://flic.kr/p/xtUmYy[/IMG] [url]https://flic.kr/p/xtUmYy[/url] [ATTACH]50432.vB[/ATTACH] [/QUOTE]
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