Similar spool but way more power! The compressor map is a lot wider then the 8374/9180
Peak efficiency is better on the 9180 @ 77% while the 8474 is @ 75%. Looks like they traded peak efficiency for surge protection. Our motors are big enough so we shouldn’t have to worry about surging.
This past SEMA Borg Warner mentioned they are finally going to release what was past considered "Black Series" with the EFR 8474, 9274 and 9280. The compressor wheels will be anodized black to differentiate between existing EFR Series.
9280 vs. 9180 = Same 91mm Exducer, but 9280 has 74mm Inducer and 9180 has 68mm Inducer.
9274 vs. 9174 = Same 91mm Exducer, but 9274 has 74mm Inducer and 9174 has 68mm Inducer.
8474 vs. 8374 = Same 84mm Exducer, but 8474 has 68mm Inducer and 8374 has 62mm Inducer.
Here are some release notes - some shops are already starting to receive the turbos.
As you are looking at the 9180 below are some overlays.
Compressor Map Comparison - with a few others thrown in for good measure for others that are interested.
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I'm more concerned about spool since at the end of the day it's a big turbo. If the 8474 will spool faster while making the same power then that's what I'll get