Compression Ignition Addict
Join Date: Sep 2012
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Bad HG? heres my coolant psi test
OK, I have a 2005 with egr cooler delete and some other stuff that isn't really relevant. I'm currently running the SCT Canned tune Performance and boost hits 22.5 at WOT, although I saw 24psi once.
So I made my backalley coolant psi gauge today after oil and fuel filter change. It was hot already and all pressure was released. I started it up to idle for a while. after 10 minutes of idle, the ect was 180 and I had about 4 psi.
Started driving and did some medium to heavy 0-60's, it took about 4 miles to get to 200 degrees and it went to about 8-10psi in the coolant. then I did two 1/4 mile runs with the gps based drag app. After I did both it was at 14.5psi and 216 degrees ECT. I pulled over and released the pressure out of the cap and turned the engine off for about 2 min.
So started it up, psi back at 0 and ECT to 198 degrees. did another 1/4 mile drag and then drove about 6-8 miles cruising at 65mph now ive got 4psi and temps are right at 200 degrees.
then I do several 0-60s. The PSI gauge goes up about 1.5psi when I stomp it and drops(quicker than going up) 1.5psi as trans shifts up gauge goes up 1.5psi, trans shifts, then psi goes back down. at the end of it its at 8psi.
go for another series of runs and the coolant pressure only when at WOT, or up a little at 50% throttle. It hits 12.5 psi and doesn't go up any higher. I did a few more 0-60's and it might have gone up to 13-13.5psi.
All in all I drove about 40-45 miles for this whole test start to finish.
I have EGR cooler delete so that's not an issue, but my EOT and ECT deltas are hitting 26 degrees cruising at 65mph flat ground.
Im thinking either HGs are bad, or the tune is just so hot its flashboiling coolant in some hot spots. the coolant is Fleetguard ES Compleat OAT its not 50/50, its only about 40/60 or 45/55 because they only sold pre mixed and there was water in the block from flushing.
any insight on whats going on? Thanks
on a bright note, the app says I did a 1/4 mile in 15.33 which I was impressed to see.