Bruce Nunnally Posted April 22, 2012 Report Share Posted April 22, 2012 As I planned, today I replaced the heat exchanger for the intercooler on my 2008 Cadillac STS-V. The stock or OEM heat exchanger is a radiator type single pass (one row) heat exchanger. Each drop of water goes past the cool air 1 time. Read more: http://caddyinfo.com/wordpress/?p=12411 No time left for tests today -- hopefully tomorrow. Overall not a difficult job comparatively, although it took me way too long to do because I had not taken off the front end before, so lots of figuring things out as I went, and I tried to avoid taking off the front wheels. You probably can, but need to run the car (for power steering) and turn the wheels to get them out of the way on this side, then that side, to get all the plastic rivets out of the wheel wells. Once I gave up and put the car up I made a lot more progress. Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
BodybyFisher Posted April 22, 2012 Report Share Posted April 22, 2012 Great job Bruce, can't wait to see you measured results Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted April 23, 2012 Author Report Share Posted April 23, 2012 The first chart shows overall trend over time for my normal data capture run. The spikes are 0-60 runs. The X axis is actually the sample time for the scan, which runs from 0-65K so I simply left it off for clarity. The Y axis is IAT2 temps in degrees F. Initial IAT2 trends with the new Intercooler Heat Exchanger appear to be somewhat worse than the OEM intercooler heat exchanger. This is disappointing since tuners have reported improvements with similar heat exchangers. There may be more variables at play here, but my first tests suggest the new HX as installed is not performing better than the OEM HX. Read More: http://caddyinfo.com/wordpress/?p=12452 Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted April 29, 2012 Author Report Share Posted April 29, 2012 What I found today was that the intercooler IAT2 temp never got below 131F, which is worse than the baseline above. Unfortunately, test1 today I fumbled the mouse at the end of the test and lost all the test data by accidentally closing VCM Scanner (doh). The STS-V was heat soaked before the test, starting at 156F for the IAT2, and was able to cool down to 131F and was still dropping slightly on highway runs. But it was not getting to a steady state of under 120F as the OEM did. Read More: Repeating Cadillac STS-V Intercooler HX Tests Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted April 30, 2012 Author Report Share Posted April 30, 2012 Updated graphic -- appears to confirm the IAT2 temps with the new HX in place of the OEM HX are higher. More info added to the article link above. The low yellow and green lines are Jaimie's STS-V with the 45321 HX and a Frozen Boost 101 FMHE in series, with a higher flow aftermarket intercooler coolant pump. Read More: Repeating Cadillac STS-V Intercooler HX Tests Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
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