Driving "blind" on EGTs

[Greg Boardman-RIP]

DP,

You are right in putting on a Dipricol pyro. They are great and very accurate. As for the temps according to rpm's while towing heavy(14,000). I have found that if I can keep it at 2500 rpm's with a full load, My egt's stay at or around 1100*. If I pull real hard they can and do go over the 1250* safe zone. The thing is I am hitting 90 mph by that time and have had to let up so I don't go off the road. One nice thing about our trucks is that if you are pulling uphill WOT and not gaining, you can let off a little bit and egt's drop fast to 900*. In my truck in stock form I could see 1350* give or take 50*. I would recommend to anyone who is willing to work their truck to install an EGT guage fast. Running hard while lugging the motor, by the way 1800 rpms is peak torque, I can build EGT's just like a 12 or 24 valve. Heavy and torque = high egt's. Then nice thing is when you hit 2200 rpm's your egt issues dissapear until you top out at 3200 rpm. s in any gear.



Greg

 

[Sherman]

Originally posted by DPelletier

Sherman,



- Did I say something to indicate that I race my truck, or give a hoot about how fast it will go empty? Towing is my only concern.

- 1600 rpm may be the torque peak, but its much easier to hold speed at the horsepower peak. try it.

- Do you have a pyro. If so, what does it say when you're running at 14,000 lbs @ 70mph? What effect does rpm have?



I've heard the same stuff before too. Cummin's tests these engines at full load, full throttle conditions for days at a time, yadda, yadda. BUT I've also seen dozens of posts where STOCK trucks are producing EGT's at higher RPM's that I wouldn't be comfortable with.

It's your truck, do what you want. I've made my decision; DiPricol pyro from Geno's should arrive any day. It will be installed pre-turbo and I won't tow at over 1250 degrees sustained, period. If it becomes too much of a pain to limit the EGT's with my right foot, then the upgrades start. First will be an AFE, then Banks 4" and if I still have EGT's issues, probably get Piers to "do his thing" with my Turbo.



The key observation here is: 3rd gen trucks generate higher stock EGT's than thier predecessors.



When I read threads like this, I realize why I only want to buy new trucks.



Dave

sorry Dave, didn't mean to pick on you about racing,just been reading too much about bombing the Cummins And you wrongly got caught in the cross fire,what I meant to say was, the lower rpm is better much the same as you have said,I am pulling a 14000# 43' horse trailer at 70 mph at 2200rpm and am getting 10. 5 mpg, I would like to get the rpm down to 1900rpm but don't want to change the rear end so I will have to live with that,the mpg is still good when you consider the weight and windage, any mods must give better mpg I have plenty of power,my truck is box stock now but would consider mpg enhancements only if it gives more power then that is a bonus,I have a few million miles on the road with diesels and also several thosand hours with very large farm tractors so know a little bit about diesels,Why does CATand Detroit with their 60 series recommend 1475&1550 for their engines?

 

[DPelletier]

Sherman,

No problem. I also have been reading too much about drag racing CTD's lately. Nothing wrong with it, just not what I care about. As far as the RPM thing goes, I see what you're saying. At some point there is a balance point between RPM and EGT's, both on the low and high RPM side. If you're running on flat ground or don't need full throttle, I agree lower RPM is better. I think my milage is best at 1,700 RPM or so, BUT if you're talking uphill, full throttle conditions 1,700 will generate higher EGT's than 2,200 - 2,500. It then seems to change again as RPM's get higher with about 2,700 - 2,800 rpm being the max you can go without the EGT's climbing rapidly. As I said, my new DiPricol pyro should be here any day and then I'll be able to take alot of the guesswork out of it.

To me, other than the sheer size of it, the main advantage of the Cummins is the ability to produce power at a lower RPM than the competition.



Cheers

Dave

 

[Sherman]

Originally posted by DPelletier

Sherman,

No problem. I also have been reading too much about drag racing CTD's lately. Nothing wrong with it, just not what I care about. As far as the RPM thing goes, I see what you're saying. At some point there is a balance point between RPM and EGT's, both on the low and high RPM side. If you're running on flat ground or don't need full throttle, I agree lower RPM is better. I think my milage is best at 1,700 RPM or so, BUT if you're talking uphill, full throttle conditions 1,700 will generate higher EGT's than 2,200 - 2,500. It then seems to change again as RPM's get higher with about 2,700 - 2,800 rpm being the max you can go without the EGT's climbing rapidly. As I said, my new DiPricol pyro should be here any day and then I'll be able to take alot of the guesswork out of it.

To me, other than the sheer size of it, the main advantage of the Cummins is the ability to produce power at a lower RPM than the competition.



Cheers

Dave

I hear you Dave,loud and clear,all the way from BC. Most of my pulling is in the great states of Florida,Georgia,Alabama and the Carolinas. Usually the biggest hill is an overpass,now up in BC youa'll have some serious hills,different game,the way I look at it,every 100 rpm costs 1 mpg, loaded ,above 1900rpm with the 6spd and a 4. 10 gear in the rear. For pulling in your mountains a PYRO is manditory. The only time I am on the wood hard is going down on ramps onto Interstate hwys,and then it's yodle time up to at least 70mph. If you come across any economical ways to increase mpg let me know.

 

[DPelletier]

Probably the best way to increase mileage is to haul less cr*p. I can't believe that I'm at 17,800 lbs GCVW with a truck, camper and "utility" trailer, but I am! Just can decide whether to leave behind a kid or two, the wife, the dog or the extra beer! LOL.



Dave

 

[RankRam]

Originally posted by DPelletier

Probably the best way to increase mileage is to haul less cr*p. I can't believe that I'm at 17,800 lbs GCVW with a truck, camper and "utility" trailer, but I am! Just can decide whether to leave behind a kid or two, the wife, the dog or the extra beer! LOL.



Dave

Leave the beer and switch to whiskey! LOL

 

[Sherman]

Originally posted by DPelletier

Probably the best way to increase mileage is to haul less cr*p. I can't believe that I'm at 17,800 lbs GCVW with a truck, camper and "utility" trailer, but I am! Just can decide whether to leave behind a kid or two, the wife, the dog or the extra beer! LOL.



Dave

Don't want to be on your wife's hit list so I am staying out of this one!

 

[DPelletier]

Yeah, you must know her, she can be NASTY!!!:--)

Good news is, she doesn't read these posts!!!



Dave