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Hi all, There have been all kinds of conversations on and off SAU about single turbo options for RBs (and other engines really) in the current state of the game and while I've not seen any evidence of compressor maps being inaccurate, different manufacturers use different ways to normalise and present the numbers, different cut off points, and different ways of estimating hp from compressor flow which can result in people expecting too much or too little from their turbos. I've decided to semi-roughly translate it all into an even measure and shove what I consider "the most relevant" turbos for most people who would be talking about turbo choices in here, and split the compressor flow potential they have at 20psi, 25psi and 30psi - using "65% compressor efficiency" as a cut off. Those are fairly familiar and reasonable reference points, and as you exceed 65% I view it that it's where the intercooler and hotside are starting to have to carry disproportionately more of the load to keep things happier. This is the "you're pushing it" zone, imho - even if it's not really maxing the turbo out. It seems to be a reasonable way of gauging them on a similar scale if you're going to being matching the turbos for real world performance. It may not be PERFECT but I think it gives enough of an idea of how they may compare, I'm pretty sure all these turbos have hot side options which are pretty close to supporting the exhaust flow needed these days - give or take, but some of the numbers here may explain a few interesting things seen.. Hope it's vaguely interesting reading Turbo 20psi 25psi 30psi GTX3071R 50 52 53 GTX3071R Gen2 51 52 53 EFR7670 53 56 57 S257SX-E 54 57 60 G25 660 55 60 59 GTX3076R 59 61 62 Gen2 GTX3076R 59 61 62 GTW3476R 60 64 67 EFR8374 65 68 69 GTX3582R 70 72 74 Gen2 GTX3582R 70 75 77 EFR9180 74 79 84 GTX3584RS 75 80 84