PSI screw superchargers are manufactured using material processes and materials designed to provide reliable, repeatable and dependable products designed to stand up to the test of time. Our track record of providing consistently reliable and safe superchargers that provide “Mind Blowing Performance” speak for itself. Just like every other manufactured component in the world, PSI Screw Superchargers are manufactured to repeatable geometrically controlled production tolerances. PSI Screw Superchargers also have several specific dimensions thoughtfully engineered to allow for thermal growth / expansion, distortion, ingestion of foreign debris etc. without sustaining metal / metal contact that is severe enough to initiate metal / metal material transfer. Obviously, these scenarios will lead to catastrophic failure of the supercharger.
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Over the years we have found “tightening” the production clearances with different coatings can provide added performance. We have also found in some cases “tighter isn’t always better” and can have a negative effect on the internal working temperatures in the supercharger, either decrease the performance of the supercharger and / or adding heat that can lead to supercharger damage due to thermal expansion and / or metal to metal contact.
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In many cases the addition of coatings (an “overcoated” scenario) adds internal heat that increases the internal working temperature, increases the manifold temperature, therefore increasing the “boost” reading thus requiring additional fuel to offset the added heat. This leads to a misnomer that additional horsepower has been found, due to the increase in measured boost and the added fuel consumption. When coatings are applied properly, evenly and allowed to “run-in” and burnish in most cases the screw supercharger’s overall performance can improve. In the large scope of things this increase is slight and relative to several other variables pertaining to individual applications such as; tune-up (fuel flow and location in the supercharger), supercharger overdrive, beginning supercharger clearances, injector hat configuration, ambient inlet temperature, ambient air quality conditions, etc.
We have also found thru testing that in many applications (temperature & horsepower dependent) our screw superchargers perform as designed without the addition of any coatings and in the “natural” or “raw” state.PSI production superchargers “as manufactured” have been coated with various types of polymer type coatings that have been field tested and have evolved and changed as the technology of coatings have improved. The primary intent of these coatings is to provide corrosion protection. These coatings have been specifically designed to protect the rotors and the integrity of the laminate material used to bond the “male” rotor. Due to the variances in coating material, coating hardness, applied coating thickness, etc., it is absolutely “normal” to have visible areas of “raw metal” exposure. These exposed areas may appear on either or both rotors (Male & Female) as “feathered”, “worn”, “burned through” or “burnished” on the softer production coatings or as a “chipped”, “shattered”, “flaking” or “delaminating” on the harder production coatings.
The extreme loss of coatings early in a supercharger’s life typically indicate either a relatively “tight” production supercharger or a supercharger that has sustained elevated internal temperatures caused from not enough fuel in the supercharger to properly cool and seal the unit thus creating an event of enthalpy that is greater than designed. Neither visible scenario will cause damage to the supercharger, engine or induce issues associated with catastrophic engine failure such as detonation / pre ignition.
We have been made aware of several “myths” circulating in the world pertaining to supercharger coatings. For questions pertaining to specific supercharger coatings please feel free to inquire anytime at techsupport@psisuperchargers.com.
The extreme loss of coatings early in a supercharger’s life typically indicate either a relatively “tight” production supercharger or a supercharger that has sustained elevated internal temperatures caused from not enough fuel in the supercharger to properly cool and seal the unit thus creating an event of enthalpy that is greater than designed. Neither visible scenario will cause damage to the supercharger, engine or induce issues associated with catastrophic engine failure such as detonation / pre ignition.
We have been made aware of several “myths” circulating in the world pertaining to supercharger coatings. For questions pertaining to specific supercharger coatings please feel free to inquire anytime at techsupport@psisuperchargers.com.