Boost exhaust temp???

[Saverio]

I installed the Maretron setup in the spring and I'm trying to figure out if I have issues and if I do which engine is it. The boat runs fine starboard runs a few degrees warmer.

My exhaust temp on starboard is almost doubled. Could I have made an error programming them?

 

[Skybolt]

I do not know the exact EGT's that the 3126 should run at, but to be honest, 432 seems to be almost half of what I would expect and 252 is so low I can't comment.

The first pic of 812 seems about right for that RPM displayed in the second pic, what RPM is the 432 for?

What senders are you using? And what PGN are you looking at to display the EGT's?

 

[my3sons]

Yeah, the 812 is reasonable, the 432 is not. You installed this in the spring and this just started happening? I’m pretty sure your motors are fine and it’s a telemetry issue, if that helps ease your mind any. The egt’s of your motors at cruise should run about 50* cooler than my Cummins and the 812 would be very close to that.

 

[Saverio]

the 432 temp was just when the boost kicked. if I had to guess around 1700. I'm using the Maretron pressure probes. TTmot was a great help when I was setting up

Saverio

 

[my3sons]

Ok, at cruise they run the same +/-? Still seems temp is too low for the boost pressure Unless the temps were climbing fast fast when the picture snapped.

 

[dtfeld]

Something is off. Is this a WOT reading?

I would expect the EGT to read about 1000* F + at 2650 RPM, but it could be higher if you are not reaching full rated RPM (2800+) It takes a about 30 seconds for the temp to stabilize.

I would check that you have the wires tight/clean on the TMP-100, and verify that you are using a Maretron probe on channels T0 and T1 only, that's the only 2 channels chat allow for EGT. Its easy to get them connected to T4 and T5. Also if you are not using the other channels, program channels 2-5 to disable so they wont send data (at least as a troubleshooting step).

Boost numbers look pretty much on target, so probably an EGT instrumentation issue. Worst case, you have bad EGT senders.

I'm assuming the senders are in the stock CAT exhaust location.

 

[Maybe A Dancer]

Been re-doing/upgrading dash and instruments.

I'm a simple man, an old fashioned guy.

Added Veratron electric boost & after some issues, changed out the Veratron pyrometers for old fashioned Hewitt thermocoupler style this past weekend.

420DA with 3126 CATS here, been bringing everything back to baseline the past 18 months so my numbers should hopefully be good.

I'll share my data at various RPM/Speed here when I get her back out on the water.

This weekend gotta get the xmas lights on her, as she's the lead boat in this year's Parade:

www.puntagordaboatparade.com

Last year's video:

punta gorda boat parade 2022 - Google Search

BEST !

RWS

 

[Saverio]

none of my numbers are at WOT. the highest ones are around 2650-2700

 

[Irie308]

How are the temps when you are just sitting at the dock cold? Do they match up?

 

[Maybe A Dancer]

How are the temps when you are just sitting at the dock cold? Do they match up?

about 200 at the dock, even running the RPMs up after warm up.

Will have more to repot in 2 weeks

BEST !

RWS

 

[dtfeld]

All of this data is based on the engines having a WOT at or slightly above 2800 with a clean bottom and loaded as you would normally run. If this isn't base-lined, its going to be tough to tell what you really have going on with the engines, as it wont correlate to the published numbers.

Once you do base line it, you'll get a great set of tools to keep tabs on the health of the engines and the bottom.

 

[ttmott]

EGT operating ranges should come from Caterpillar. There should be a recommended temperature for load condition.
Go through the DSM410 manual starting at page 195 for the TMP100 Configuration. Make sure on the device instance and the correct channels are used. Also as stated above only terminals 1,2,3, and 4 can be used for EGT on the TMP100. EGT probe wire polarity is important when connected to the TMP. If the probe wires needed to be extended the wire must be "K-type" thermocouple wire.

 

[Saverio]

EGT operating ranges should come from Caterpillar. There should be a recommended temperature for load condition.
Go through the DSM410 manual starting at page 195 for the TMP100 Configuration. Make sure on the device instance and the correct channels are used. Also as stated above only terminals 1,2,3, and 4 can be used for EGT on the TMP100. EGT probe wire polarity is important when connected to the TMP. If the probe wires needed to be extended the wire must be "K-type" thermocouple wire.

I didn't have to extend any of the wires. the temp has always been almost cut in half even idling at the dock. I'll check the tmp 100 again

 

[ttmott]

Yes two independent configurations - one for the TMP and one for the DSM. Make sure you configure the TMP first. Probably the most confusing thing about Maretron.