The lower trim comp wheels also tend to come on sooner and more linear, were the higher trim comp wheels tend to come on abruptly (again, just generalizations, as turbine trim, turbine housing A/R and motor port work will effect spool and how it comes on also. The higher the trim (larger variance from inducer to exducer ratio) the quicker it will make boost, and it be happier at higher pressures and lower flow numbers. Higher the trim (closer the inducer and exducer ratio), the more likely the turbo will flow more at lower boost ratios and longer spool up time. Larger exducer the more effient in higher pressure ratios, but hurts overall flow, produces boost quicker for the same given inducer size. Hope this helped anyone looking to know the 'basics'. Also note, even though the T04B 60-1and T04E 60 trim have very close wheel specs, the T04B flows much more, (partly due to the "B" width ). The T3 will NOT flow nowhere near the to4B 60-1 or T04E 60 trim. more on the subject a T3 60 trim is a 1.83" inducer and 2.367' exducer. EXAMPLE: a T04B 60-1 is a 2.34" inducer and 3.00" exducer wheel, a T04E 60 trim is a 2.29" inducer and 2.950" exducer.
#Make turbo spool sooner series
There are trim levels for separate sub families within a series family. does the wheel "induce" air or "exduce" it. = major) but the inducer of a turbine is the major diameter and the exducer would be the minor or smaller dia. For a turbine the minor and major are called the same (small dia = minor, larger dia. exducer of a compressor or turbine wheel.įormula for determining trim: (Minor wheel diameter would be the inducer on a compressor wheel and the exducer would be considered the major diameter. Inducer / ExducerInducer / Exducer and how they affect one another 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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