EGT Update

[Jack Owen]

Got the Quadzilla in and working. On power level 4 (add timing) My EGTs have dropped 50 degrees. With the EGT defuel set at 1250 and driving with some restraint I can keep them under 1200 no load. Pulling my trailer on 2 lane roads I shut off the overdrive, run 55 mph at 2150 RPM and my EGTs stay right at 1000. Trailer on the highway I had to rely on my foot and defuel settings. I added an entry level H2O kit. Spray starts at 8 psi and keeps EGTs below 1200. Overall my EGT problem is MUCH better but I still fell like I am missing something?

No boost leaks.

EGT 960 at 74 mph, 1960 RPM, and 2 lbs boost, and 23% load NO TRAILER. Do these numbers look right?

[dripley]

My truck at 74 mph, EGT 650-700, 2250 rpm, 2 or 3 psi of boost, not sure on the load, truck at about 7500 lbs. All on level ground. What size tires are you running? Sounds like that could be part of the problem. The fuels you run might have some bearing on that too but I dont really know. I believe thats been brought up before though. 

[Jack Owen]

The boost pressure is what I wondered about. Thanks!

[CTcummins24V]

unloaded EGTs still seem a bit high 

[dripley]

13 minutes ago, Jack Owen said:

The boost pressure is what I wondered about. Thanks!

Your boost seems fine, but the EGT's are out of whack. I am not sure that mine is that high with 5th wheel on at 65 to 70 just cruising. More like 850 or so.

[Mopar1973Man]

3 hours ago, Jack Owen said:

EGT 960 at 74 mph, 1960 RPM, and 2 lbs boost, and 23% load NO TRAILER

 

No. Even my current setup I run 650-700*F at 80 MPH, and barely 24 to 26% engine load. 

 

 

I suspect it that you running no tuner and got a nasty loss of timing after 20% load so EGT's jump up fast. As you can see I've got 21* of timing during this time and EGT's are lower but ECT is higher because more flame is kept in the cylinder making more power.  

Edited July 22, 2018 by Mopar1973Man

[Jack Owen]

Yep. Addressed all the usual issues. Now looking for that one little thing that might have been missed. Fuel doesnt change anything.

Thanks. Any idea what your boost pressure is? Your RPM are 300 higher than mine. What does the timing icon look like on the quadzilla?

[Mopar1973Man]

1 hour ago, Jack Owen said:

Any idea what your boost pressure is?

 

typically at 80 MPH, it's about 5 PSI with my HX35/40 (60/60/12) turbo.

 

1 hour ago, Jack Owen said:

Your RPM are 300 higher than mine.

 

Dropped the 235's (31-inch) and went to 245's (30-inch) tires which change my final ratio to 3.69 to 1. Reduced the engine load keeping cruise timing longer. Typically my normal cruise speeds range from 45 MPH to 65 MPH. Very rare do I ever see an interstate and travel 80 MPH I might set for 70 MPH.

 

1 hour ago, Jack Owen said:

What does the timing icon look like on the quadzilla?

 

It looks like a little gauge icon on the far right. Thre is like 4 or 5 of them you'll have to fish that out. 

[Jack Owen]

Thank you. Boost psi at cruise?

[Mopar1973Man]

44 minutes ago, Jack Owen said:

Boost psi at cruise?

 

I use my ISSPro gauge being the Quadzilla is inaccurate and Stock MAP sensor is not accurate past about 20 PSI then it skews.

 

55 MPH = 2 PSI

65 MPH = 4 PSI

 

Typically speaking.

[trreed]

Do you have a dragging brake?  Have you looked at the injector nozzle tips? Something is still goofy.

[notlimah]

55 minutes ago, trreed said:

Do you have a dragging brake?  Have you looked at the injector nozzle tips? Something is still goofy.

 

Agreed

 

 

I have bigger injectors then you and can stand on it up a steep hill unloaded and barely crack 1400 just for a second or two. 900-ish cruising is high as others have pointed out.

[Jack Owen]

No dragging. Going to pull an injector and make sure I have the ones I ordered.

[trreed]

Do you have a pin gauge? Without one best you can do is guess the orifice size. I would pull all 6 to be able to check all tips for damage.