ISX ECM Pittsburgh, Bully Dog, TS MPHD......???

**milskired** · 02.06.2011

Originally Posted by Flying Finn

Deleting the EGR is adding heat to the engine. The cylinder temps will go up creating more NOX. EGR lowers cylinder temps by causing an incomplete burn (so to speak) (less oxygen, so less fuel in mix = lower cylinder temps).

High HP engines run pretty close to the line on fuel/air mix. Disable the EGR and those temps increase. Get them too high and heads will crack, valves will burn, etc. That is where a pyrometer is vital to have. You can make sure the EGT's stay below about 1200*F.

Most high HP engines burn stuff up when the EGR is removed because of a specific issue that is between the steering wheel and the seat.

If you do it on a high HP motor just be advised you need to be a little more careful. You cannot flog the Sugar-Honey-Iced-Tea out of the engine. Else you will be sitting at the side of the road wondering Whiskey Tango Foxtrot?

I guess since these motors have to much computer stuff on them I guess what your saying is true. But in all reality if you have less oxygen going into the motor that means your boost numbers are lower which means the the computer is going to be dumping in more fuel to try and spool the turbo which means your just dumping fuel into your cylinders, raising your EGTs because you have to much fuel and not enough air, and your CPs are also sky high which is what ends up breaking internal things.

Now by deleting your EGR out of the system your coolant temps are going to be lower because your EGR cooler is not going to be hotter then HE!! trying to cool the exhaust gasses before it throws them back into the intake so I'm not sure how taking it out of the system would make the motor run hotter. Also if your Pyrometer is in the exhaust manifold (Pre turbo) your motor should be totally fine running them up to 1300-1350. Most of the threads I have read that somebody has unplugged there EGR, there collant temps have decreased and there MPGs have increased.

**Displaced Yooper** · 02.07.2011

I unplugged the EGR on my ISX 475 about a month ago, and have seen between a .5 to 1.0 mpg increase, and my temps have gone down.
I don't know where this "turn off the EGR and you'll start breaking stuff" info is coming from, but I have seen NO negative results thus far, and have not heard of any from anyone I've spoke to who has done the same to their truck. Not only that, but a tech at a Cummins place (that shall remain nameless to protect the innocent) worked on my truck (simple gasket replacement) had no issues with my having disabled the EGR, and told me that he would do the same to any he would own.

**dieselroarmt875b** · 02.07.2011

Originally Posted by Displaced Yooper

I unplugged the EGR on my ISX 475 about a month ago, and have seen between a .5 to 1.0 mpg increase, and my temps have gone down.
I don't know where this "turn off the EGR and you'll start breaking stuff" info is coming from, but I have seen NO negative results thus far, and have not heard of any from anyone I've spoke to who has done the same to their truck. Not only that, but a tech at a Cummins place (that shall remain nameless to protect the innocent) worked on my truck (simple gasket replacement) had no issues with my having disabled the EGR, and told me that he would do the same to any he would own.

ecm still calculates the air/fuel ratio with the inert gases in count ,substitute them with more air and we mess up the whole combustion process which is a very complex thing with many variables.
its not that critical on low hp isx's so mechanicaly disabling the egr may work but on high hp its different story

**milskired** · 02.07.2011

That would be where you go and get the ECM reprogrammed for a non EGR ISX and put in an EGR delete or a block off plate. That would solve that problem.

When you say high HP what do you consider high? Everybody has there own opinion of that they see as high HP. To me 600 is not high yes that is the bigger ISX but to myself 600 HP is not very high. 800+ to me is the point where I would consider it being a high HP motor.

**GREGG KEMP** · 09.14.2011

I've seen these powerpups increasing mpg by 15% on regular basis on cummins, detroits, and cats if you have any questions, you can call the guys at equipment management solutions. 208-540-1521

**SHC** · 09.14.2011

I've been thinking about getting a Power Pup for my MBN CAT, deff interested in hearing some good reviews as well!!

**raf147** · 09.14.2011

Originally Posted by SHC

I've been thinking about getting a Power Pup for my MBN CAT, deff interested in hearing some good reviews as well!!

Maybe I missed something somewhere but I've never heard of Power Pup? Can someone explain it how it works and if it's any good .. Got C15 mbn, thanks.

**ProduceHauler** · 09.14.2011

Originally Posted by dieselroarmt875b

ecm still calculates the air/fuel ratio with the inert gases in count ,substitute them with more air

bullsxxt. ECM not only is totally capable of measuring amount of exhaust flowing into cylinders... GET THIS.... ECM is using EGR-Valve to send whatever amount it needs to be send into cylinders. People with no clue about engines are responsible for many... many failures. I'd say ignorance killed 85% of dead ISX-es

**Gasienica** · 09.14.2011

Originally Posted by ProduceHauler

bullsxxt. ECM not only is totally capable of measuring amount of exhaust flowing into cylinders... GET THIS.... ECM is using EGR-Valve to send whatever amount it needs to be send into cylinders. People with no clue about engines are responsible for many... many failures. I'd say ignorance killed 85% of dead ISX-es

Job security at the cummins dealer and local mechanics. Lol