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Message: <blockquote data-quote="SDF" data-source="post: 3246115" data-attributes="member: 546">simple explanation from Garrett on their method called A/R.whereas IHI, MHI, Holset and Borg Warner measure differently, hence they measure the smallest volute in the housing area and it's usually in "cm". Eg. IHI has P12 = 12cm2 and MHI has a 6 or 8 on the turbine housing it depicts 6cm or 8cm volute area.Holset doesn't measure the trim of a compressor wheel, instead they only look at the width of a compressor wheel, hence the comparison vs a Garrett style (in2 / ex2 x 100 = trim) vs Borgwarner vs IHI vs MHI measurement isn't really fair and the only way is via the manufacturer compressor map chart. (again this is only a guide, if it's been mix-n-matched / hybrid, the compressor map may not be accurate anymore and if the displacement of engine is different, the outcome is gonna be varied as well). Japanese makers are very seclusive and compressor maps are never easy to get, even distributors find it a hassle to obtain one.Turbine wheel trim is variable as well and old skool style of Garrett (o-trim, p-trim, q-trim) are no longer relevant. IHI has a mixed flow trim. Then came cut backs and now Garrett has GT trims. So too many to compare and explain.Products these days work out straight out of the box ! Don't bother with old skool tech of mix-n-match and hybrids, buy a part number and plonk it right in your engine, it'll deliver the HP closest to your desire. As an end user like us all, we just want something that works, unless you have lotsa time and money to R&D.I am glad jin started this thread and hopefully it gets logged and noticed and more importantly it clear up the air over "myths". These explanations and discussion have been around for a long long time in ZTH especially. Guys, keep it coming BUT keep it constructive.</blockquote>

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