Questions to ISX owners

Loaded with what?

 

Ok I see... So what is the story on your mpg's when punch the numbers on a calculator at fillups? I've never seen a digital mpg gauge on anything that was accurate. The CAT display in my truck always reads lower than actual the one in my Ram is higher...

 

I have an 09 ISX. The only problems I had is the EGR cooler went out after 7 months. Seems to be a common problem with the newer engines.

Fuel mileage at 65mph I averaged 6.9 mpg. When I first got it it averaged 6.5 and improved as I broke the engine in.

This last reset on my stats I been running 60 mph for a couple days and I'm at 8.1 mpg. But back to 65 I go

It's the best pulling engine I ever operated with it's low torque cam. 1200 it comes alive on hills while others are downshifting.

 

What about the 15 liter?....I doubt you're going to get more than 7.5 MPG...

 

kind of makes a difference what size gallon you calibrated to--whether it is an imperial gallon or US gallon--makes a big difference

 

I have since changed what I have done with my ISX. Did have the EGR unplugged for around 180,000 miles.

I have since put on a larger intake manifold from PDI. It came with a steel plate that covers the port where the EGR gasses enter the intake. I took off the adaptor that connects to the port, hacked off the extension that fits into the intake manifold with a chop saw, ground the remaining surface flat. I then left the steel plate on the new manifold and connected everything back up, using a little Permatex form a gasket between the adaptor and the steel plate. I then plugged the EGR back in.

Engine runs even better than before. The turbo seems to spool up quicker and the engine response and power are improved. Will need to get it on a dyno to confirm how much. Added bonus: when I had it into Cummins last week, I had them do diagnostics on the EGR system. No problems, no fault codes. Cummins techs could not tell I had blocked off the EGR gasses to the manifold till I pointed it out.

 

And now you are cooking your coolant in the EGR cooler using trapped, compressed exhaust till it start leaking and screw you again.
Nothing wrong with that, some people just have too much time on their hands lol

 

The company runs bulk tankers.

WorkingClassPatriot, your probably right about the 7.5 mpg. I don't figure fuel mileages for the 15 liter as I run the speed limit. So if it is 75 then I run 75.

I don't use the read outs on the dash. They are close but not right on.

 

Not sure this reply to me regarding my putting on the intake and the EGR gas block. If so, then It would beg the question how I would be cooking the coolant since there is no exhaust flow thru the cooler? The exhaust would have not way of progressing into the cooler if any portion of the tube is blocked. Much in the same way that turning on a garden hose, if there is a closed nozzle on the end of it, no water is going to flow thru it. Just the initial exhaust that enters on startup.

Either way, if the exhaust cooler was being overworked, then it would show up on coolant temp gauge. Coolant still running as cool as it did with EGR unplugged which was considerably cooler than with the EGR system open and working like from the factory. Regarding pressure, I have opened up the exhaust and have a turbo boot on the turbo for increased exhaust flow. The risks are not quite the way you describe. The weak link in the EGR system, regarding pressure, is the silicone boot that is between the metal tube and the adaptor on the intake. If pressure was an issue, that boot would blow before any other part of the system. It is in fine shape still.

I do have extra time on my hands when it comes to keeping more of what I earn. Compared to the OEM engine and the modifications I have made, I am keeping a solid $10K net more a year that isn't going out the stack. And all it cost me to do that for all modifications since I have owned the truck is less than $2K. 595,000 miles and original EGR valve, EGR cooler, etc.

Oh well.

 

What kills EGR coolers? The heat kills them, what else?

I'm amazed by how some people change.
Wasn't that you who was the biggest EGR-disconnector of all times quoted even by radio show hosts?
What happened? Don't you think you misleading your cult followers sending them mixed messages? lol