pyro temps -say it isn't so

[drno]

from my post in accessories you can tell i am not a fan of the x-monitor. having had it installed by a good shop in the post turbo position per instructions i have noticed the following

1- cruising at 45 mph on level groung my guage reads 500-600+

2- yesterday while going to the dealer for an oil change at 2k miles i went approx. 1 and 1/2 miles up a 6% grade at 55mph in overdrive with minimal throttle and low boost and the temps reached almost 900 degrees.

3- i try to idel in my garage after any use but after a few miles of cruise speeds 35-45 mph it still takes a few minutes to get to 350 and i would still be waiting if i were to wait till it hit 300.

obvious questions ---a-nonmal b- something wrong with the guage (would not surprise me) c- exact placement either pre or post turbo greatly affects readings d-other

 

[SRadke]

A and C. Temps sound relatively close but placement (pre or post) will affect your readings. I've never had one post turbo but your readings sound similar to mine pre turbo before my intake, exhaust, and timing mods. These new trucks run hot.



-Scott

 

[RThompson]

So,,, what is the question?

 

[drno]

re read questions are a,b c, and d

 

[NIsaacs]

Temps sound about right to me. Running 55 up a 6% grade in overdrive is lugging the motor. Try the same hill about 65, and see if the temps go down. When you idle for the cool down, be sure and shut off the AC, the extra drag will pull the temps up to about 350-400 deg. After I chug down my driveway, I can cool down to 300 deg. in less than a minute. My pyro's are all post.





"IF IT AIN'T CUMMINS POWERED, IT AIN'T A TRUCK"





"NICK"

 

[drno]

nick,

i may be over estimating the grade (no sign) as there was immediate throttle response, no rpm drop , and no down shifting- all of which make me believe that i was not lugging. however i have to go back via the same roads next week and i will try the hill out of overdrive (i can't risk taking it at 65 as it is a 50mph zone and i just got a $125 high speed driving award for 15 mph over the limit. ) thanks for your input

 

[jcarey]

drno, my temps are about the same as your's. I can get to almost 1100 pre-turbo on some grades, locked up and empty, more often 850-900, though.



Jim

 

[drno]

i guess they just run hot--since i have not bombed my truck i will not worry about it. i wonder how high the temps would have gone had i not put on a free flow muffler and intake

 

[ttreibel]

Don't worry about it you can run 1200 all day long just take 5 minutes and let it cool down before you shut her down.



I would of gone pre-turbo sometimes the best thing to do is burn the instructions that come with the gauges and pick a few brain here on the boards.



I would also add 100-250 degrees to your temps because you are post-turbo.



Last night on the way back from Diesel Thunder I ran 975 degrees all the way up the Vantage hill outside temp was 63 in 5th (OD) on my 03 SO

 

[WStoops]

Hi, I just put a Di Pricol EGT gauge on my 04. 5 and was shocked by the temps. I run around 600 just going down the road at 55 or so. I really launched it up a local road past a ski area. I would say 6 to 7% grade. I got a good head start on the hill up to 65 or so then accellerated to 75 as it started to incline. Temps quickly climbed, foot to the floor, to 1400 as the speed fell to 65 to 70. Even on the flat, a full throttle accelleration, will drive the temps up to 1200 by the time I reach 65. ????????????????By the way, I was empty, just the cap on the bed, 7500 lbs.

 

[drno]

i guess we are all in the same boat-hopefully cummins has built these motors to withstand these temps or we will all be standing on the line that says warranty.

 

[matches]

Knowledge is the key to anything. The temps you guys are refering to are normal. You should read and or search the forums in the older years to find out a lot of info on this, post turbo max is about 950, pre turbo 1250, don't be afraid of the temps, but you need the right info to understand them and how they react to the the right foot pressure, and boost. I could go on and on but you need to do the research to understand yourself.

 

[drno]

i have searched the threads and opinions vary widly. it also appears that the 325/600's not only run hotter but are built to withstand these higher temps.

 

[DLeno]

The alloy piston material itself I don't believe has changed -- and they can change shape in the presence of heat just as readily as the previous engine.

 

[Sarge]

There are differences in the 2nd gen and 3rd gen engines, and are rated for different temps. The third gen pistons have oilers under the pistons to spray oil from the bottom side for cooling. The 3rd gen motors are rated to 1450* egt numbers. This info was recently given at a So Cal TDR rally by John Homes of Carson Dodge, and regular TDR writer. I am on the road at the moment with my 12K fiver, and regularly see 1300* under acceleration, and if on a 6% grade in 5th gear, I hit and hold 1400*. The boost in this senario will sit a 30# until I roll off the throttle. These numbers will pull me up the hill at 55 MPH. I've seen these numbers for 1800 miles on this trip now, and am curently in Colorado, and will be hitting the Rockies when I leave here in a few days. My truck is still stock, and there is no worries.



I highly recommend that if you BOMB, do the whole host of things that go along with that new gadget you put on (more air, modified turbo, exhaust ect) These motors are a marvel just the way they are, but if you just can't resist, just remember the BOMB'ers credo "I AM MY OWN WARRANTY STATION" :-laf Sarge

 

[DLeno]

yes, good clarification Sarge. my comment was intended to answer the question of differences between the 03-04 and the 04. 5 trucks. The 600s run hotter but are not made to take it any more than the previous 03-04 engines are. thats all I meant.

 

[Sarge]

 

[tdecosta]

Doug and Sarge,

Thanks for the good information. After installing SPA dual guage (boost & EGT), I saw EGT's occasionally over 1300 degrees, with 1360 as a peak reading (not pulling, truck is stock). I have personal experience with melting an aluminum piston due to wrong A/F in a modified sports car. I love tuning, and I love power, but I won't be bombing my truck until I have more confidence in the safety of these devices. As has already been noted, these are already awesome powerplants!

 

[DLeno]

yea, you're positioned well tdecosta. The SPA pyrometer is the fastest of them all and will give the most accurate peak temperature reading of any gauge out there for quick acceleration studies. I would be highly interested in more detail data as you learn it -- your totally stock truck and its EGTs.