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Message: [QUOTE="Cr500, post: 578764, member: 9468"] That statement I made was meaning towards a 38r within its normal efficiency range. Etc. but, in my laymen s way of thinking I look at back pressure as a number to tell me how well the overall setup is working. Without knowing everything about your situation, comp inlet temp, outlet temp, comp inlet pressure/ vacuum, outlet pressure, etc it would hard to determine shaft speed, because with just a boost reading you can't plot a line on a map. You can get an idea with boost, but with knowing everything else you can do the equations backwards and get a line plotted. From that you can determine shaft speeds and such. Garrett makes a shaft speed sensor kit. Early ih garrett vgts had them. Actually every 6.0 bearing housing has the provision for it, just not drilled. It requires on those a different bearing collar. Another way to roughly get an idea is with a mass airflow meter of some kind. The 6.0s, 6.4s have them because of the egr mess. If you knew airflow at compressor inlet, basically what it is consuming, and boost, in this case compressor outlet pressure vs manifold, and say you had a maf/ boost reading in 5 psi increments, you could get a line plotted on a map, then from that get a close measurement on not only how that compressor is working on your vehicle, but also shaft rpm. You will see if you need more air, or less, smaller turbine, larger, etc depending on where everything fell. But I would not look at back pressure as a relation to wheel speed. [/QUOTE]

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