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ITP OVERBOOST KITS vs. "Boost Relief Valves"
...just the facts...
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Some of our competitors have made statements suggesting that regulators don't work well in the Powerstroke MAP Sensor circuit. They recommend the use of a "pop-off" style valve (commonly referred to as a "Boost Relief Valve") instead...some even recommend using more than one "pop-off" valve! The main problem with "pop-off" type valves is that they actually release boost pressure when they open...so by installing a "Boost Relief Valve", you're actually installing a LEAK... why would you want to do that?
It has even been suggested that using a pressure regulator like the one in our "Overboost Eliminator" kit will reduce the boost pressure seen at the MAP Sensor because of the "Cracking Pressure" required to begin operating the regulator. While this may be true of cheap hardware store pressure regulators, our kit uses a very high qualilty regulator that does NOT have this problem!
See the short video below for a demonstration of the operation of our "Overboost Eliminator" kit. The bottom gauge is the supply pressure, the top gauge is the pressure the MAP sensor would see, between the gauges is an ITP "Overboost Eliminator" kit. Note that it doesn't matter if we increase the supply pressure quickly or slowly, the MAP gauge (top) always responds with an identical reading to the supply gauge (except when we exceed the pre-set 22.5psi max setpoint). Also note that the MAP reading remains at the 22.5psi max setpoint until the actual boost reading drops below that pressure, after which the readings are once again identical. This is EXACTLY what you want from an "Overboost Eliminator" type kit!
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A number of our customers have replaced their Relief Valves with our Overboost kit and found improvements in performance. Some of them sent their Relief Valves to us for testing on our setup fixture. The videos below demonstrate how the Relief Valve devices work. Just like above, the bottom gauge represents the boost seen by the engine and the top gauge represents the boost seen by the MAP sensor.
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This video demonstrates the functionality of a "Single Boost Relief Valve". You can see the MAP gauge stopping at about 21-22psi while the other gauge reaches 30psi (this is the desired result)...but what's that noise? You're hearing boost pressure escaping from the relief valve...a leak! Also, notice how the relief valve being open affects the MAP readings as the boost pressures come down...the MAP reading is several psi lower than actual boost until the boost pressure is low enough to allow the relief valve to close.
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In this video, the engine boost pressure is set to 30psi and the "Dual Boost Relief Valves" (2 leaks are better than 1?) held shut manually, both gauges read approximately 30psi. Watch to see what happens when I let go of the Relief Valves...the MAP reading drops to 20psi (which is the desired result and is fine) and the engine boost side drops 5-6psi to about 25psi (this is not good). The sound you hear is both relief valves open and letting pressure escape, which equates to a large leak in the intake system and a less than desireable result.
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In this video, watch as I bring the boost pressure up quickly. The "Dual Boost Relief Valves" open at about 20psi and the MAP sensor nevers sees enough boost to trip the SES light (again, the desired result)...BUT...once the valves open the engine side boost rise is slower and requires more inlet pressure to achieve that same 30psi. Compare the smoothness and quickness of the boost rise in the bottom gauge between this "Dual Boost Relief Valve" video and the ITP Overboost Kit video above. The leak created by having 2 relief valves open is not a small matter.
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With both single and dual "Boost Relief Valves" we noticed similar results. Once the relief valve opens, it takes more supply pressure to maintain the same inlet pressure because of the leak in the system. In both cases, supply pressures of 35-40psi were required in order to reach 30psi on the "engine" gauge in the videos above once the relief valves had opened. A supply pressure of 30psi would result in a max inlet pressure of 25-26psi once the relief valves had opened...no matter how far we opened the inlet regulator. Any way you cut it, installing a "Boost Relief Valve" is the same as installing a LEAK...period.
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DON'T RELIEVE YOUR BOOST PRESSURE...TAKE CONTROL OF IT!!!
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