Does anyone know if there is a way or if they are planning on offering anything that will allow us to alter the setting on the 3rd injection event? It seems like you could obtain better fuel mileage by doing this and running a cat delete pipe.

 

The amount of fuel injected during the 3rd injection event is insignificant, and won't have a measurable effect on fuel economy.

 

I thought I heard somewhere that Marco tried a 3rd event delete and Smarty lost 100 hp? If thats the case, it must squirt quite a bit of fuel through the 3rd event, or mebbe that's Marco's secret ... create a 3rd event that really is a 3rd event....

 

It is the first injection (pilot injection) they need to get rid of. I know on a John Deere engine you save .2 gal an hour at idle when the pilot injection turns off.

 

The engine is designed to use the third event to develop its rated power and do it within the emissions regs. The 3rd event is part emissions and part power so you can't just "turn it off". Without making other changes all you do mess up the powerband, generated power, etc.

The third event is not a constant event anyway. It only activates when the demand is sensed. Mileage loss is a result of a total design not just one part.

Removing the CAT is not going to gain much if anything at stock power levels as it is a relatively small restriction.

If it had a JD engine that might be true. The pilot injection has little effect on total fuel consumption and is quite probably a bonus for efficiency. The 305 engines do just fine with 2 events.

 

I wonder just what it is that causes the 325 to get less mileage than the 305. It's not the HP difference, I'm talking about the normal use mileage. Just cruising around and using 305 HP or less. Highway, city, etc.

There has been a lot of talk about it being the 3rd event that was the issue, but maybe not. Could be cam timing or injection timing too.

Wetspirit

 

It is a given that 325 will use more fuel than 305, 265, 245, etc if you use the power, and, for the most part our driving style will reflect that. If you got it your gonna use it.

As I said, its the whole design that contributes not just one piece. Retarded injection timing, late exhaust valve timing, extendd valve overlap, and turbo drive pressure consistently higher than boost pressure equals emission engine which will almost always equate to less overall mileage.

It is entirely possible to drive these trucks all day and never have the 3rd event activate. Its contribution is mainly to enhance the power band, and, provide the heat for the CAT to work when the load demands push the engine into higher emissions. Eliminate the need for the previous and you eliminate the event. However, since valve timing and overlap is static there is an EGR effect across the rpm range that will be consistent. Once you start mixing exhaust gas with intake charge air to keep temps under control you start loosing a bit of efficiency due to incomplete combustion.

 

Maybe Marco did delete it and that's why the new HOT version, these guys are seeing like 22mpg!!

 

It did have a JD engine one was a 8.1L the other was their new 9.0 in a 8430 both tractors have fuel consumption gauges that give you Fuel consumption per hour. When the pilot injection turns off Fuel consumption goes down, and the engine sound changes. I believe JD just uses it so the engine warms up faster, not to make big power. The pilot injection on the Cummins is their for noise control and maby some emission control but not for Hot Rod Power!
In 1999 the powerstroke got pilot injection fuel mpg went down
in 2003 Cummins got pilot injection fuel mpg went down. I wonder why

 

Are they seeing 22mpg with the hot version? I have not been keeping up on the smarty. If they are seeing those numbers I will be getting one though.

 

I don't have any complaints with the fuel mileage on my truck. With only around 5000 miles on it right now its getting 18mpg. On its very first tank of fuel it got 16mpg. Its just getting better and better all the time. I always heard of the bad mileage that the earlier 3rd gens were getting but my 07 5.9 has been doing surprisingly great already.