Diesel cooling options and ideas

[@californiajeeping]

But if the "upgraded" intercooler provides lower, or more efficient cooling than OE, then it stands to reason that the oil will cool a little more effectively. How much remains to be seen/experimented.

yes but to just add to this….your IAT from the turbo post intercooler will never be below 175 or so even with a massive intercooler. So is a drop from 250 degree down to 175 going to cool anything down? Probably not the air explodes in the engine so it’s not really pulling any btus from the engine coolant or cylinders..

im skeptical air intake temps would affect much. I am willing to try with water methanol at some point.

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[LordEnzo]

yes but to just add to this….your IAT from the turbo post intercooler will never be below 175 or so even with a massive intercooler. So is a drop from 250 degree down to 175 going to cool anything down? Probably not the air explodes in the engine so it’s not really pulling any btus from the engine coolant or cylinders..

im skeptical air intake temps would affect much. I am willing to try with water methanol at some point.

My bad, I meant radiator, not intercooler. Corrected my previous post.

 

[@californiajeeping]

My bad, I meant radiator, not intercooler. Corrected my previous post.

Ok gotcha yes that would definitely help. Think of your coolant system as a reserve. If we can get the starting temp down it will add more capacity when it’s under heavy load.
That ice box radiator is 2 row and all aluminum. I suspect that it would run cooler if you could couple it with a lower thermostat.

 

[M390]

Made a few observations after having 4.56 gears installed. Previously rig had stock 3.73’s on same 35” tires and would pull just fine but did have more of a tendency for EGT and engine oil temps to creep up. I feel the lower ring and pinions help tremendously there being that now I have a bit more mechanical advantage. This is the first real towing trip I’ve made that was about 130 miles round trip from south of Uvalde to the Leakey TX area. Hill country, with plenty of decent ups and downs on the trek. Was running an average speed of 65 mph and my R-Pod 202 I’m guessing weighed in around 5800 lbs with full water tanks, camping gear, E bike, generator and extra fuel. Jeep also had a bed full of gear. Highest oil temp I saw was 252. Prior to the ring and pinion change I’d never pulled it with gear loaded and tanks full and could get oil temps over 260 without pushing it that hard. Not too scientific but what I observed. A lot of folks on here claimed they thought I went way too deep on gears for my tire size but I stand by the decision wholeheartedly especially after some towing time.

 

[LordEnzo]

Made a few observations after having 4.56 gears installed. Previously rig had stock 3.73’s on same 35” tires and would pull just fine but did have more of a tendency for EGT and engine oil temps to creep up. I feel the lower ring and pinions help tremendously there being that now I have a bit more mechanical advantage. This is the first real towing trip I’ve made that was about 130 miles round trip from south of Uvalde to the Leakey TX area. Hill country, with plenty of decent ups and downs on the trek. Was running an average speed of 65 mph and my R-Pod 202 I’m guessing weighed in around 5800 lbs with full water tanks, camping gear, E bike, generator and extra fuel. Jeep also had a bed full of gear. Highest oil temp I saw was 252. Prior to the ring and pinion change I’d never pulled it with gear loaded and tanks full and could get oil temps over 260 without pushing it that hard. Not too scientific but what I observed. A lot of folks on here claimed they thought I went way too deep on gears for my tire size but I stand by the decision wholeheartedly especially after some towing time.

Sound like the gear change put it back to its "normal" efficiency range

 

[M390]

Sound like the gear change put it back to its "normal" efficiency range

My thoughts exactly

 

[Hondo1]

I’ve been running 4.56’s for a year now, they definitely make the towing experience nicer and crawling off road, however around town and on the highway I feel like they are to low and I’m on 37’s. If I were to do it all over again I’d go 4.10’s

 

[M390]

I’ve been running 4.56’s for a year now, they definitely make the towing experience nicer and crawling off road, however around town and on the highway I feel like they are to low and I’m on 37’s. If I were to do it all over again I’d go 4.10’s

My mileage, highway or town, stayed exactly the same with 4.56’s as with 3.73’s on 35” tires. If it helps me to keep my cooling and EGT’s in check I see no downside.

 

[CrazyCooter]

I just swapped to 4.10s this past week and so far unloaded I'm not impressed as expected. Feels slower overall sluggishly grabbing more gears. It pulls 7th and 8th up the hills and the trans seems to run a couple of degrees warmer.

This last rv upgrade pushed the 3.73s over the edge with more wind drag and a couple hundred lb more. Im not expecting any change in coolant 9r oil temps because I already tested the oe 33s and 37s back to back, same load, same road, and simliar temp with almost same results.

I do plan to jump up to 38s next time and I think it will be balanced out.

 

[M390]

I just swapped to 4.10s this past week and so far unloaded I'm not impressed as expected. Feels slower overall sluggishly grabbing more gears. It pulls 7th and 8th up the hills and the trans seems to run a couple of degrees warmer.

This last rv upgrade pushed the 3.73s over the edge with more wind drag and a couple hundred lb more. Im not expecting any change in coolant 9r oil temps because I already tested the oe 33s and 37s back to back, same load, same road, and simliar temp with almost same results.

I do plan to jump up to 38s next time and I think it will be balanced out.

You think it feels slower after going lower with gearing? Did you adjust the computer for the gearing and tire size to address shifting issues? I’ve got a Banks Derringer and Pedal Monster on mine. After switching to 4.56’s I’m seriously considering ditching the Derringer altogether I’m so happy with the acceleration from Pedal Monster and gearing alone.

 

[CrazyCooter]

You think it feels slower after going lower with gearing? Did you adjust the computer for the gearing and tire size to address shifting issues? I’ve got a Banks Derringer and Pedal Monster on mine. After switching to 4.56’s I’m seriously considering ditching the Derringer altogether I’m so happy with the acceleration from Pedal Monster and gearing alone.

Yes I adjusted the tire setting 24k miles ago when I installed them. Gear setting was changed before I road tested following the install.

I feel like the diesel just likes to be loaded up and can't rev fast enough with factory tuning to take advantage of the revs.

 

[The Welsh Griffin]

Would adding a product like this help in conjunction to the other work you are doing.

Apologize if this was already mentioned.

 

[@californiajeeping]

Yes I adjusted the tire setting 24k miles ago when I installed them. Gear setting was changed before I road tested following the install.

I feel like the diesel just likes to be loaded up and can't rev fast enough with factory tuning to take advantage of the revs.

A transmission tune would help you get a lot of torque management I. First and second that’s why the power doesn’t really come on until it loads up in third…

 

[steelponycowboy]

Made a few observations after having 4.56 gears installed. Previously rig had stock 3.73’s on same 35” tires and would pull just fine but did have more of a tendency for EGT and engine oil temps to creep up. I feel the lower ring and pinions help tremendously there being that now I have a bit more mechanical advantage. This is the first real towing trip I’ve made that was about 130 miles round trip from south of Uvalde to the Leakey TX area. Hill country, with plenty of decent ups and downs on the trek. Was running an average speed of 65 mph and my R-Pod 202 I’m guessing weighed in around 5800 lbs with full water tanks, camping gear, E bike, generator and extra fuel. Jeep also had a bed full of gear. Highest oil temp I saw was 252. Prior to the ring and pinion change I’d never pulled it with gear loaded and tanks full and could get oil temps over 260 without pushing it that hard. Not too scientific but what I observed. A lot of folks on here claimed they thought I went way too deep on gears for my tire size but I stand by the decision wholeheartedly especially after some towing time.

Judging by the Squat, you have surpassed the maximum tongue weight, perhaps towing rate. In any case driving with the weight squatting the back like that is not safe by any means.

 

[steelponycowboy]

I finally was able to talk with Bullet Proof Diesel in Mesa AZ. They have engineered a new aluminum radiator for the diesel JT that in testing lowered temps as much as 20%. They are going to mount the prototype in their JTRD and do some real world testing. If all goes well they will start making them and let me know. I'll be the first in line.

Now they gave me a tour of their facility when I first took my Jeep into them. Their products are 1st rate, the manufacturing process is high tech and the best thing is they are made in America. They have a great reputation with the full sized diesel crowd. I know some of you have expressed concerns with Mishimoto and I'm not sure how well I would trust a lot of these sellers on Ebay and Amazon as I've had bad luck, but from what I have heard and seen, Bullet Proof Diesel is the real deal and I will hang in there until they let me know they have the product for us and post it here also

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