dunefreak Posted April 19, 2006 Share Posted April 19, 2006 Just curious how high everyone else's exhaust temps get up to when towing. I was suprised how high mine get when pulling Mt Potisi! I decided to back off 5mph and let my motor live a lilttle when the manifold temp got to 1600 degrees! As soon as I backed off a tiny bit the temp dropped to 1400 deg immediately. I am guessing my "after turbo temp" is no more than 1200-1250 degrees. What are your temps and is your pyro gauge reading pre turbo or after? Mine is before the turbo (in the exhaust manifold) therefore my actual turbo temp is gonna be lower than the gauge temp reading. Quote Link to comment Share on other sites More sharing options...
OGP Posted April 19, 2006 Share Posted April 19, 2006 What does Nick say about this Pete? It HAS COMPRESSION RIGHT? Quote Link to comment Share on other sites More sharing options...
EY3BA11 Posted April 19, 2006 Share Posted April 19, 2006 Actually i told pete what i thought and of course i was wrong as usuall but wtf do i know!! im no mechanic i dont know sh*t!! Quote Link to comment Share on other sites More sharing options...
wingnut Posted April 19, 2006 Share Posted April 19, 2006 Pete....No expert but this is mine and my friends experience on this...........Post turbo temps will be roughly 250 to 300 degrees less than manifold temps....my thermocoupler is on the down pipe. From what I was told from autometer and several diesel specialists, the gauges "red"area is designed to read post turbo on the down pipe. My egt's are at 1100-1150 pulling Potisi at 48-52 mph. Still have plenty of pedal left but I don't want to melt anything. If you get the time I would put the coupler on the downpipe. Every gauge kit I've seen(ispro, auto meter and banks) instruct you to mount on the down pipe. This being said, I also took my infrared heat gun and checked the down pipe temp and compared it to what the gauge read and they were very close....just my .02 Quote Link to comment Share on other sites More sharing options...
dunefreak Posted April 19, 2006 Author Share Posted April 19, 2006 Pete....No expert but this is mine and my friends experience on this...........Post turbo temps will be roughly 250 to 300 degrees less than manifold temps....my thermocoupler is on the down pipe. From what I was told from autometer and several diesel specialists, the gauges "red"area is designed to read post turbo on the down pipe. My egt's are at 1100-1150 pulling Potisi at 48-52 mph. Still have plenty of pedal left but I don't want to melt anything. If you get the time I would put the coupler on the downpipe. Every gauge kit I've seen(ispro, auto meter and banks) instruct you to mount on the down pipe. This being said, I also took my infrared heat gun and checked the down pipe temp and compared it to what the gauge read and they were very close....just my .02 It's almost impossible to mount it on the down pipe on a DMax from what I have seen. The down pipe has a heat shield covering the whole pipe out of the turbo and is stuffed behind the motor up against the firewall. I could go farther down, but that is too far away from the turbo to read accurate. :angry: Quote Link to comment Share on other sites More sharing options...
lvnalolife Posted April 19, 2006 Share Posted April 19, 2006 Don't want to start a this spot is better than this spot thread for where to put the thermocoupler. From everything I have read the most accurate reading would be pre-turbo. There are too many variables that can cause different readings for post turbo setups. One could be the intercooler, if it gets somewhat blocked, will cause different readings. I know on fords, and prob all the rest of the diesels that its not the turbo that is as important as the pistons. In the powerstrokes the pistons are aluminum.. see the attached thread I copied from Diesel Stop Website "The International engineers explained it a lot different during a national rally of members of TheDieselStop touring the PSD engine plant in Indianapolis. Don't worry about high egt hurting the turbo. It's made put of steel and can take a lot more heat than the aluminum pistons. If your engine blows up because of high egt, it will be the pistons, not the turbo, tearing things up. The pistons begin to deform at about 1,250 egt. Eventually, the top ring will jump out of the deformed piston, and then you have bits and pieces of the remains of the steel ring punching holes in the top of the deforming (melting) piston, and or pieces of ring getting in the valves and plugging them up. Whatever the exact results, when the piston deforms, your engine is toast. That's why the International engineers insist that if you hot-rod your PSD, then install a pyrometer with the thermocouple (sender) mounted pre-turbo - in the up pipe or the exhaust manifold. Then use 1,250º as your red line. They said you can run all day at 1,200º pre-turbo egt, but stay away from 1,250. A tiny bit of research can confirm this. Look up the melting point of aluminum." I think I will keep mine Pre-Turbo. And Pete, I try to keep mine under the 1250 mark. I think the Duramax is somewhere close to that. I think I read somewehere that about 1300 is the max. Pete check out this site. It has a lot of good info on it..http://www.dieselplace.com :angry: Quote Link to comment Share on other sites More sharing options...
dunefreak Posted April 19, 2006 Author Share Posted April 19, 2006 I think I will keep mine Pre-Turbo. And Pete, I try to keep mine under the 1250 mark. I think the Duramax is somewhere close to that. I think I read somewehere that about 1300 is the max. Pete check out this site. It has a lot of good info on it..http://www.dieselplace.com :angry: JJ, I have been on that site ever since I got my DMax and that's where I have read that 1400-1500 degrees pre-turbo is okay as long as it's not held there for extended periods of time. 1300 degrees is max ok temp if it's after the turbo from what all those diesels guru peeps over there have said. Quote Link to comment Share on other sites More sharing options...
lvnalolife Posted April 19, 2006 Share Posted April 19, 2006 (edited) JJ, I have been on that site ever since I got my DMax and that's where I have read that 1400-1500 degrees pre-turbo is okay as long as it's not held there for extended periods of time. 1300 degrees is max ok temp if it's after the turbo from what all those diesels guru peeps over there have said. Just from reading all the crap I have on mine, the MAX I would go post turbo (if the 1400-1500 is the true max) would be 1000-1100, I have heard that there could be up to a 400 degree difference. But yours is pre-turbo so the 1300 max sounds good. I have hit 1450 once or twice on short bursts but have been told not to hold more than 1250 for any amount of time. I just roll off the pedal a little. Usually I just turn off the OD (tow-haul for you) and let the lower gear pull. It keeps the EGT's down with the higher rpm/less strain. Hey, even Gale Banks (who i think knows his sh*t) tells you to put it in the manifold. All the "true" programmers and builders do the same. On a side note, I was surprised how well the new trailer towed on the way back from Cali. I thought it would really suck with my lift and tire size. I guess the gearing helped a lot. I had no problems cruising up Baker grade at 65-70 and keeping the egts around 1100. I could have went faster, but kept it safe. You know the speed limit is 55 w/ trailers in Cali. We will see when it is fully loaded though! Not looking forward to that! :angry: Edited April 19, 2006 by lvnalolife Quote Link to comment Share on other sites More sharing options...
sanddunesaddict Posted April 19, 2006 Share Posted April 19, 2006 Well i was always told that 1250 is max after the turbo. The egt is hotter...way hotter before the turbo. My truck always was ran on the ragged edge when my father drove it.He kept it at 1225.Our thermocouple is after the turbo. J&S diesel(who did all the hop-ups)and Cummins informed him to keep it under 1250 post turbo. Quote Link to comment Share on other sites More sharing options...
dunefreak Posted April 19, 2006 Author Share Posted April 19, 2006 Usually I just turn off the OD (tow-haul for you) and let the lower gear pull. It keeps the EGT's down with the higher rpm/less strain. I have an OD AND a tow-haul button as well on mine. :angry: I can disable OD and keep it in tow/haul mode. Quote Link to comment Share on other sites More sharing options...
1320 Posted April 20, 2006 Share Posted April 20, 2006 I run a 12 valve cummins. I ve sustained 1300-1350 for 14-16 hrs straight before. I used to keeep it just under 1400 pulling hills. Im pre turbo ib the exhuast manifold. That was when it had twin coumpound turbos and just the stock intercooler. I ran up to 40 psi towing , it will go to 55-60psi. Since then I ve added two more intercoolers, large ones in a custom bumper I made. Now I only see 1250-1300 on the out side, ussually its down around 1050-1150. I pull a 50 ft enclosed trailer 16-20k lbs for the trailer the truck is 7400 lbs. To get 1300 out of it I have to pull pottisi at 65 70 but traffic is ussually in the way. Baker grade it pulls at 70-75 at 1250 or so then creep up to 1350 at the top. It runs better at 1300, since it has just over 200k miles. I still hold boost to under 40-45 most of the time. Quote Link to comment Share on other sites More sharing options...
MCGYVER Posted April 20, 2006 Share Posted April 20, 2006 Just curious how high everyone else's exhaust temps get up to when towing. I was suprised how high mine get when pulling Mt Potisi! :headbang: I decided to back off 5mph and let my motor live a lilttle when the manifold temp got to 1600 degrees! :smiley: As soon as I backed off a tiny bit the temp dropped to 1400 deg immediately. I am guessing my "after turbo temp" is no more than 1200-1250 degrees. What are your temps and is your pyro gauge reading pre turbo or after? Mine is before the turbo (in the exhaust manifold) therefore my actual turbo temp is gonna be lower than the gauge temp reading. Awe heck, run her till she starts to knock and run like p@@p and then just drop it down about 5 mph. Quote Link to comment Share on other sites More sharing options...
dunefreak Posted April 20, 2006 Author Share Posted April 20, 2006 Awe heck, run her till she starts to knock and run like p@@p and then just drop it down about 5 mph. But it DOESN'T knock or like like sh*t no matter how hard I run it! :smiley: :headbang: Quote Link to comment Share on other sites More sharing options...
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