On this set up we have had reading of up to 380 degrees at 32 psi. Which seems high but that's 75% adiabatic effecient at 90 degrees ambient. But that's after we inject water. We have never taken the temp without h20 injection. That is why we like to inject water into the impeller, because at 380 degrees the water evaporates and also cools the blower. The intercoolers that we have been using were mac truck 4"radiator cores. Mark Johnsons dad, (Lawrence) made them for us at his radiator shop in 1989. 4x4x16 we were able to cool the temps to 250 degrees. Hope to get a whole lot more of a temp drop (like down to 100) with this new intercooler pictured in this build page.