If you have a fully ported head and huge cams that will make power till 9000, the. ![]() If you have head-work and cams that stop pulling at 8000 RPM's, it's smart to run the. 48 A/R housing, it might have a power-band of 3000-7000, with the. You can't cross compare different types of housings and wheels, but if you have a typical T3/TO4E 57 trim with a stage 3 exhaust wheel and a. Simply put, on small displacement engines a smaller A/R is better, on large displacement engine a larger A/R is better due to exhaust volume.Ī larger A/R will spool later and provide a higher power band, if your engine is capable of reaching the RPMS it should be used in. With the nozzle off you gain volume, but lose pressure and you can't turn the pinwheel as much. There are issues with the nozzle on the end, you lose volume but gain pressure. Put a nozzle on it an the pinwheel will spin like mad. ![]() With the hose open ended, the pinwheel spins okay. Imagine if you have a garden hose spraying water out at a pinwheel A/R ExplanationA/R is the rated volumetric efficiency of a turbos 2 sections, so to speak.
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