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Old 07-21-2013, 04:02 PM
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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.
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Old 07-21-2013, 05:49 PM
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Edit... I missed that you had an egr cooler delete...good luck.
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Old 07-21-2013, 05:52 PM
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Quote:
Originally Posted by ajfrac View Post
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.
Perhaps I am missing something, but those pressures dont seem too bad to me. I recently posted about my coolant pressures (observed yesterday), and I saw pressures as high as 22PSI, and saw some correlation in boost and coolant pressure above a boost of 18PSI. I also have puking as the degas bottle cap is venting around 18 PSI coolant presure.

Are you puking coolant?
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Old 07-21-2013, 05:58 PM
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no, not puking coolant.
I thought I was losing some because it seems to be going down, but if I release the pressure at full temp its right where it was a month ago. a month ago I had to add a quart, I figured it was because it was right after a flush so I assumed it was just air pockets.
if its puking its almost certainly a HG and or EGR cooler that's blown. you should remove egr valve and see if theres moisture in your intake manifold to determine if its egr cooler.
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Old 07-21-2013, 06:06 PM
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Yeah those numbered dont seem bad to me at all
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Old 07-21-2013, 09:52 PM
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Im hoping theyre good. My plan is to do studs "one at a time" if theyre good. It would be such a hassle to take the heads off and id like to avoid that. Anyone else have knowledge on the numbers im seeing? I want to be for sure theyre ok. Thanks to those that already chimed in.
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Old 07-21-2013, 10:04 PM
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https://www.youtube.com/watch?v=IcjE...e_gdata_player




This is a video of one of the tests. Gauge is upside down, outer ring is psi and the first bold tick mark is 10 psi. The little stopper that holds the needle at 0 is actually 2 psi.
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Old 07-22-2013, 02:54 AM
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You do not have a bad head gasket leak if it was you would get pressure and temp increases within seconds and will rise and fall with throttle application.

Remember you are dealing with hot combustion gases of around 600 psi @ 900 degreesF

Since you are running a performance tune even when towing eventually you will lift the heads enough to develope gasket problems.
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Old 07-22-2013, 06:52 AM
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Well my .02 cents is that the system is getting definately getting pressurized, and since you've got an EGR delete, the pressure must be coming from the head area. It's just not too bad yet. Thing is, it's not going to fix itself, it will only get worse right? So You can probably get by for now, but if I were you I'd start saving my $. Don't assume that your heads are re-usable either. They could be cracked. Plan for the worse, hope for the best, right?
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Old 07-22-2013, 02:17 PM
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Would there be a definitive test for a small HG leak? Compression test maybe?
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