Pre EGR overrated ?

And that is one of the reasons I went with a glider and pre-egr engine. I have 7000 miles on this one, and it is averaging 7.5, pump to pump calculated. The lowest was 6.7 when I was pulling a load of lead, grossed out, with a majority of that run on two lane and very hilly terrain, and a lot of slowdowns for towns and agriculture equipment. The best has been 8.8 with a light load on 4 lanes. Last fill was 8.3 with 32,000 in the box and running a lot of rolling hills.

And some folks say you can't get good mpg from higher hp engines. 500 hp Detroit 60 12.7 with an 18 spd with 2.64 rears, yes, 2.64 rears. Guess my engine never read the trade journals that this wouldn't do well.

 

What you are describing is the main justification (from using real data not TS/CB/Internet chatter). I would suspect you would never have found a used newer truck with the spec's you needed.

Nice numbers.

 

Process at a shop would be no different than "jerry rigging" it. Changing a head lamp is harder on my truck than blocking the EGR and I have the most complicated motor to do it on.

Only way I have found a shop to remove the EGR is for testing purposes. We did that on our Int. and just forgot to return it to have it added.

 

Wow that's good MPG's unfortunately out here in California gliders are basically no good.

It makes total sense what you are saying about getting good MPG on a high horse power engine and the reason why i'm saying that is because i know that with a lower hp engine like mine (400 hp) i need to put my foot down on the throttle longer with a heavy load on a hill to even try to get up to a certain speed that i would obtain easily with a higher hp engine therefore using less throttle on the high hp engine which equals to less fuel consumed

 

Ethan

 

LMFAO - my ####tail just came out my nose.

 

They said let the coal roll.....we didn't know it was gonna do that haha

Ethan

 

What speed are you running? And with those gears it must be a little doggy on the hills?

 

Not at all. I run primarily between 62 and 65 mph. That keeps me in good rpm band, 1400 - 1500 rpm, in 16th gear (direct drive). I down shift far less than when I had a 13 spd tied to 3.42 rears. It even does pretty well even down at 1300-1350 rpm on the two lanes. When I went to spec this out this way, many said it would be "doggy" and that I wouldn't like it. I was relying on advise from Pitts Power and others on what they were doing with trucks spec'd this way. It was a risk, but it played out right. Not really anything I would change. I have pulled gross loads of bulk lead down winding two lanes with good size hills and not had any problem. On the 4 lanes, it just sings along. Just pulled steel coils in 30 mph crosswinds doing hills and it worked fine.

The senior engineer at Eaton was suggesting running a taller rear ratio with direct drive at the 2011 MATS. That is another piece of advise I used. He stated tranny would run far cooler keeping it out of overdrive, and he is right. Tranny barely reaches 150F on a hot day pulling a heavy load in the hills. I know the 18 sounds like overkill, but it is really sweet and I have found some instances where splitting the bottom end under a pull has been worth it. And I have never had a situation where I couldn't start off comfortably. Sure I had to start out in low a couple of times, but most times I start in 1st or 2nd.

And if I was empty, or had a light load on and wanted to step up the pace a little, I could always move on up to 17th and keep the rpms low and run 70+. 18th at 1600 rpm would have me at near 100 mph. Not going to happen.

 

It would be aggravating if you did not have an 18 speed, it's not overkill at all, it's necessary with those tall gears. I would imagine take off is not as quick as say, my 3:70's, but who in their right mind beats on the driveline getting it up to speed in the first place. Just curious if you have ever "opened it up" bobtail or empty out in the middle of nowhere? Not looking for truck stop stories here about 130mph (yeah, yeah, sure they did!!) trucks LoL don't care about that at all, really just curious where your rpms are at say 80mph??? and what gear would you be in rolling that fast?