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turbo charger, stock or not

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I have a HX35 turbo. when I bought my Banks stinger plus it came with a quick turbo exhaust housing, big head waste gate and promised quiker spool ups. It has delivered on that promise but for the life of me I cannot find any specs on what is differant than stock except for the actuator(set to open around 34psi), and the opening for the waste gate(almost twice as large as stock). So I know I am not stock but cant seem to find any info any where as to what the differance is. I have not called Banks, but was wondering if any of you knew what is differant between it and the stock housing. Banks says it will not work with an HY, just an HX. I was very naive when I bought it and I guess I still am today.

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The HY uses a single main port from the exhaust manifold as in there is no divider. I don't know what the purpose of the divider is as I cut a hole in mine and didn't notice a difference. Anyhow that is probably why it has to be an HX as it has the divider. Though the wastegate setup is also different so maybe that's it. In any case, for quicker spoolup it is probably a smaller housing. An HY uses a 9cm housing which is really small so the relatively large (for that exhaust housing) engine has no problem spooling it up at low engine speeds. The HX uses a 12cm which takes a little more to get it going. If you floor it, the HY lights up maybe 200-300RPM sooner. But that is probably what they did, smaller housing for quick spoolup. As for the big wastegate, the cummins can actually flow more air than that little wastegate (stock turbo) can handle. I could hit 35psi with the wastegate in stock form, no boost elbow, no nothing, it was wide open but the engine had so much flow it could push the turbo beyond the 20psi that the wastegate was designed to cap. Banks surely knew this so they used a bigger wastegate that was sized properly for a cummins that was "turned up".

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