OBS 7.3 intercooling

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    OBS 7.3 intercooling

    Truck details first, 250k mile 97 F350, Alliant reman AD injectors, custom PHP tunes from when I had a buddy in the industry, 17* HPOP, DIY E fuel, 4" inlet AFE filter in the factory spot but no box, 3" downpipe to stock exhaust straight piped.

    With the new trailer and the wheeler I'm grossing 16-17k depending on how much camping shit I shove in. I'm looking at adding a small camper or pop up into this mix so it's only going to get heavier.

    Truck pulls alright, doesn't feel like I'm running out of power too bad but I have to back out to stay at 1200-1250 on basically anything but flat ground, don't get me started on the 10 mile Vantage grade in Washington.

    Sorry for the novel but I try to give as much info as possible. So can I get some details on everyone's intercooler setups? I was considering air/water since I had good results on a previous rig and packaging is easy, I didn't tow heavy with it though. I'm afraid it might heatsoak in this application​​​​​​​

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    #2
    Lots of write ups on sd 7.3/6.0 setups. All in all is a pretty easy deal.

    I was talking with a kid over the weekend, he found a complete kit for $1600.

    I mooched my known shops and suppliers and a buddy for parts, i did it for about $300. The only thing i did different than most was added a 5th boot at the alternator to gain a lil bit of length i just couldnt seem to get.
    :ogre:

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      #3
      Originally posted by total newb View Post
      Lots of write ups on sd 7.3/6.0 setups. All in all is a pretty easy deal.

      I was talking with a kid over the weekend, he found a complete kit for $1600.

      I mooched my known shops and suppliers and a buddy for parts, i did it for about $300. The only thing i did different than most was added a 5th boot at the alternator to gain a lil bit of length i just couldnt seem to get.
      What's your injector/turbo setup and what kind of egt change did you see towing?

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        #4
        I don't think that set up is near as heavy as you think. I was right at 20k with a 4k lb cab over and a full body 4runner on a normal car trailer. These trucks actually aren't *that* heavy, not compared to newer stuff. I think mine is around 6800 depending on fuel (cclb 5 spd F350) I guess it doesn't really matter since we're talking i/c not truck weight


        Here is my install

        https://www.pirate4x4.com/threads/6-...troke.1754809/

        I kinda hacked the pipes together with boots, I recently did these pipes.

        https://www.carsonstaufferdiesel.com...ercooler-pipes.

        It's night and day better, basically went from constantly watching the gauge to flat footing it on most grades.

        I wanted to do a water to air on a 90 dodge with a 12v I had, but it wasn't a row rig, more of a fuck around truck.

        I'm assuming that if you did this, you'd just tap into the engine coolant system? Or would you want to run a dedicated system? I feel like tieing into the engine coolant wouldn't be a great setup, especially on long grades.

        Doing a dedicated cooling system could be a good setup, but I'm not sure I'd want the complexity on a tow rig. You end up mounting a cooler in front of the radiator anyway.

        Maybe do the water to air tied to the coolant than do a water/meth (really just water) set up to cool everything down on long grades? Or just nitrous

        Comment


          #5
          Originally posted by Hyde View Post

          What's your injector/turbo setup and what kind of egt change did you see towing?
          I always see people say things like "200* egt drop"

          I never saw how you could get an exact number on that. I will say the 6.0 ic was a life changer for towing.

          One thing though is that it will create a little more lag.

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            #6
            Originally posted by YotaAtieToo View Post
            I don't think that set up is near as heavy as you think. I was right at 20k with a 4k lb cab over and a full body 4runner on a normal car trailer. These trucks actually aren't *that* heavy, not compared to newer stuff. I think mine is around 6800 depending on fuel (cclb 5 spd F350) I guess it doesn't really matter since we're talking i/c not truck weight
            The truck and trailer both completely empty were 10,600 on Cat scales, the Ranger is pretty chubby and I overpack.

            I'm assuming that if you did this, you'd just tap into the engine coolant system? Or would you want to run a dedicated system? I feel like tieing into the engine coolant wouldn't be a great setup, especially on long grades.
            I did the air/water on a "built" 6.9idi a few years ago with a dedicated cooling system. It did 261hp/525lbft while shredding the clutch at a dyno event. Anyway that truck would never get over 1000 degrees with a small camp trailer but weight was significantly less and I didn't long haul much.
            I'm leaning towards the standard 6.0 setup, wanted to see if anyone has done something outside the box though

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              #7
              Originally posted by Hyde View Post

              I'm leaning towards the standard 6.0 setup, wanted to see if anyone has done something outside the box though
              I love out of the box stuff, but with my tow rig I think the more simple the better. Everything on mine is a factory application except the tubes, but they're steel, so I'm not foreseeing an issue with them.

              What pump would you use? I even looked into a small car water pump that could be mounted and driven off the crank. The good thing about that would be that if it did go out, you could hopefully get one at a normal auto parts store. That and no wiring.

              I honestly can't remember if I found anything that would have worked though.

              Another option would be looking at 6.7 parts, I'm not sure how the system works on them.

              Edit: looks like the 6.7 uses a belt driven pump

              https://pensacoladiesel.com/product/...mp-single-alt/

              If I were to do it, that's what I'd use. $150 isn't even bad compared to some of the good electric pumps I looked at.
              Last edited by YotaAtieToo; 07-08-2020, 11:48 PM.

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                #8


                This is my tow rig and trailer setup, the trailer with jeep and camper is 12k.

                The truck has a set of 150 swamps injectors, banks intercooler, and kc turbo setup. I was able to tow this setup all the way across country and only back out on hills twice in the Rockies.

                In my opinion gearing is going to make a bigger difference than the intercooler, my banks setup only netted me a 200 degree drop MAX on full open pulls. My truck has 4.10 gears, with 3.55 the engine is too low of rpm's to pull considerable weight

                Im assuming your truck is an auto, if thats the case pop it out of overdrive going into a steep hill and ride it out at 2500 rpm.

                the banks intercooler was 1500 if I remember correctly and worth every penny.
                Attached Files

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                  #9
                  Originally posted by LongDong Fab View Post


                  In my opinion gearing is going to make a bigger difference than the intercooler, my banks setup only netted me a 200 degree drop MAX on full open pulls. My truck has 4.10 gears, with 3.55 the engine is too low of rpm's to pull considerable weight
                  Truck is already 4.10, and I have to kick it out of overdrive even on small hills to keep egts in check, 35s on the tow rig probably doesn't help either

                  Comment


                    #10
                    I hate to say it, but you may have some other issue. you shouldn't be robbed for power that much with 35's.

                    What are you seeing for boost numbers?

                    coolant temps ?

                    back pressure sensor operating?

                    up pipes leaking ?

                    what size exhaust housing on the turbo ?

                    Comment


                      #11
                      Originally posted by LongDong Fab View Post
                      I hate to say it, but you may have some other issue. you shouldn't be robbed for power that much with 35's.

                      What are you seeing for boost numbers?
                      Boost is in the lower 30s empty on the hot tune, mid to upper 20s loaded on tow tune

                      coolant temps ?
                      No real coolant temp gauge, oil temp usually around 215-220 towing, highest I've seen it was 230 on the 10 mile Vantage grade so I backed out

                      back pressure sensor operating?
                      Good question, I'll pull it up on the CTS when I drive home tonight

                      up pipes leaking ?
                      A little bit yes, not horribly last time I checked

                      what size exhaust housing on the turbo ?
                      Stock non gated 1.15
                      Truck has pretty good power but has always been egt limited, I can peg the gauge easily on any freeway on ramp empty

                      Comment


                        #12
                        something definitely is going on with your current set up.

                        find out what it is and either fix it or fix it with an upgrade.

                        How's your blowby? Your symptoms is really similar to my truck's original 12v cummins. Power is there but always hot EGT.

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                          #13
                          Why is everyone saying he has an issue?

                          High egts with a non intercooled truck sounds pretty normal to me?

                          Comment


                            #14
                            Originally posted by YotaAtieToo View Post
                            Why is everyone saying he has an issue?

                            High egts with a non intercooled truck sounds pretty normal to me?
                            maybe. but shouldn't peg the egt that easily.

                            Originally posted by Hyde View Post

                            Truck has pretty good power but has always been egt limited, I can peg the gauge easily on any freeway on ramp empty

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                              #15
                              I've always leaned towards it being normal with larger than stock injectors, AA OBS injectors are 90cc, AD Superduty injectors are 130-140ish according to most people

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