Ecodiesel power derating as temps rise?

[CreepyJeepy]

A cold air intake won't really change the temperature of the intake charge after the turbo. I think it might allow a tiny bit more pressure, but it will still be hot.

I agree on the second part.

You might try a water mist in front of the intercooler. I can't see them voiding your warranty over that and it will help.

Reduction of restriction pre turbo reduces turbo strain (some) as well as increases the amount of air reaching the cylinder. High EGT's are a sign of richer air / fuel ratios.

Increasing air in the cylinder reduces the amount of unburned fuel hitting hot exhaust manifolds etc and combusting post cylinder which also helps reduce EGTs. Remember Diesel engines do not operate like a gas engine... In a gas engine you utilize a throttle body to control air into the cylinders, this is different on diesel, the fuel pedal on a diesel modifies settings like fuel rail pressure and injector pulse time. There is no throttle body on most modern diesels.

Diesels need air...

Meth/Water will increase the air charge inside a cylinder as well, by a sizable amount which is why tuners use it to gain 50+ HP 70+torque on the Dodge 1500 eco's, while lowering EGT's.

Spraying the intercoolers / radiators might help a tad, but it becomes a problem to find a spot to carry that much water, plus... Why spray water all over... water and steel = rust. No need to water it down like a plant if it's not going to help a significant amount.

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[foo.c]

Reduction of restriction pre turbo reduces turbo strain (some) as well as increases the amount of air reaching the cylinder. High EGT's are a sign of richer air / fuel ratios.

Increasing air in the cylinder reduces the amount of unburned fuel hitting hot exhaust manifolds etc and combusting post cylinder which also helps reduce EGTs. Remember Diesel engines do not operate like a gas engine... In a gas engine you utilize a throttle body to control air into the cylinders, this is different on diesel, the fuel pedal on a diesel modifies settings like fuel rail pressure and injector pulse time. There is no throttle body on most modern diesels.

Diesels need air...

Meth/Water will increase the air charge inside a cylinder as well, by a sizable amount which is why tuners use it to gain 50+ HP 70+torque on the Dodge 1500 eco's, while lowering EGT's.

Spraying the intercoolers / radiators might help a tad, but it becomes a problem to find a spot to carry that much water, plus... Why spray water all over... water and steel = rust. No need to water it down like a plant if it's not going to help a significant amount.

I know how diesels work, and my 6.7 Cummins did have a throttle body.

As far as the cold air intake, I've never seen it do much on a turbo. Compressing air is always going to heat it. If you've got time to experiment, let us know if you see anything.

You really don't want to spray more water than can evaporate, for some of the reasons above plus you get more bang for the buck with the phase change of the water.

 

[Rubiman]

Has anyone experienced extreme hot air blowing towards your feet. Driver and passenger floor.

 

[steelponycowboy]

Has anyone experienced extreme hot air blowing towards your feet. Driver and passenger floor.

Yes I thought it was my imagination as it would go away just as fast as it happened

 

[CrazyCooter]

Has anyone experienced extreme hot air blowing towards your feet. Driver and passenger floor.

I did notice my feet were warmer while travelling through 125° temps, but switching the HVAC setting to split floor/dash vents seemed to fix that. I assumed it was heat transferring through the firewall/floor? If the heater core is 248°, there will be heat transfer from it regardless.

 

[steelponycowboy]

I did notice my feet were warmer while travelling through 125° temps, but switching the HVAC setting to split floor/dash vents seemed to fix that. I assumed it was heat transferring through the firewall/floor? If the heater core is 248°, there will be heat transfer from it regardless.

For me it was hot air blowing up past the steering wheel and into my face for 30 seconds or so. Outside temps 80 to 105.

 

[CrazyCooter]

For me it was hot air blowing up past the steering wheel and into my face for 30 seconds or so. Outside temps 80 to 105.

I have noticed on longer trips it seems like the compressor shuts off and the hvac switches to outside air for a few seconds with warmer air blowing and then it goes back to normal. Last weekend, my wife asked me why I shut the air off.........when I didn't do anything.

 

[Mr._Bill]

This has been reported on the gas models. When the AC is run for long periods with Recirc on, the computer will open the outside air vent for a short time and then close it again. It seems to happen every 45 minutes.

 

[Rubiman]

This has been reported on the gas models. When the AC is run for long periods with Recirc on, the computer will open the outside air vent for a short time and then close it again. It seems to happen every 45 minutes.

This seems accurate.

 

[Staphylococcus0]

This has been reported on the gas models. When the AC is run for long periods with Recirc on, the computer will open the outside air vent for a short time and then close it again. It seems to happen every 45 minutes.

Interesting. Is this supposed to help with window fogging or some sort of compressor duty cycle?
I've never noticed something like this in my 06 mustang.

 

[ShadowsPapa]

Interesting. Is this supposed to help with window fogging or some sort of compressor duty cycle?
I've never noticed something like this in my 06 mustang.

Likely to prevent evaporator freeze-up.
I've only noticed it on LONG drives in very hot and humid temperatures where the AC runs a lot.
I never noticed it at all until we were coming back from CO and it was hot and humid on that trip. Then after driving a while today I noticed it for a very short time - just seconds - but our dew point was something like 77 or 78 degrees and the temp was 84.

 

[steelponycowboy]

An update here. Visited Bullet Proof Diesel in Mesa, AZ today. Their engineers were under the Jeep, under the hood inspecting the set up, taking measurements and pictures and telling me the 3.0 ED in Wrangler type vehicles is an engineering nightmare, not so with the Ram where there is plenty of room and it is set up a bit differently.

They will be working on a "fix" for the high temps and should have a prototype solution within 30 days to test out on my Jeep. The ideas ranged from a larger radiator to a secondary oil cooler along with other measures. Perhaps methanol injection to cool the incoming air to ceramic coating the headers to cut down heat in addition to cooling the oil better.

The facility is impressive with most of it dedicated to fabricating better than OEM coolers and such. Lots of high tech machinery. I was expecting a simple repair shop and found a huge facility that has great ratings from the diesel truck community.

I have not doubt after spending the time with them this morning that they are up for the challenge and will have a workable solution for me and others shortly.

Will keep everyone posted as to the progress and final recommendations.

 

[ShadowsPapa]

An update here. Visited Bullet Proof Diesel in Mesa, AZ today. Their engineers were under the Jeep, under the hood inspecting the set up, taking measurements and pictures and telling me the 3.0 ED in Wrangler type vehicles is an engineering nightmare, not so with the Ram where there is plenty of room and it is set up a bit differently.

They will be working on a "fix" for the high temps and should have a prototype solution within 30 days to test out on my Jeep. The ideas ranged from a larger radiator to a secondary oil cooler along with other measures. Perhaps methanol injection to cool the incoming air to ceramic coating the headers to cut down heat in addition to cooling the oil better.

The facility is impressive with most of it dedicated to fabricating better than OEM coolers and such. Lots of high tech machinery. I was expecting a simple repair shop and found a huge facility that has great ratings from the diesel truck community.

I have not doubt after spending the time with them this morning that they are up for the challenge and will have a workable solution for me and others shortly.

Will keep everyone posted as to the progress and final recommendations.

I like the proven idea of coating the exhaust up front - keeping heat in the exhaust gases helps. I also like the oil cooling idea.

 

[2kXJ]

An update here. Visited Bullet Proof Diesel in Mesa, AZ today. Their engineers were under the Jeep, under the hood inspecting the set up, taking measurements and pictures and telling me the 3.0 ED in Wrangler type vehicles is an engineering nightmare, not so with the Ram where there is plenty of room and it is set up a bit differently.

They will be working on a "fix" for the high temps and should have a prototype solution within 30 days to test out on my Jeep. The ideas ranged from a larger radiator to a secondary oil cooler along with other measures. Perhaps methanol injection to cool the incoming air to ceramic coating the headers to cut down heat in addition to cooling the oil better.

The facility is impressive with most of it dedicated to fabricating better than OEM coolers and such. Lots of high tech machinery. I was expecting a simple repair shop and found a huge facility that has great ratings from the diesel truck community.

I have not doubt after spending the time with them this morning that they are up for the challenge and will have a workable solution for me and others shortly.

Will keep everyone posted as to the progress and final recommendations.

steel, thank you for doing this, I’m sure I can speak for everyone and say we appreciate it. I don’t have a JTD, but I want one and the cooling issues are casting doubt. I’m down here in Tucson, so anytime we want to go anywhere north or west we’ll be driving through steep grades and high heat. Hopefully these issues get resolved before I’m ready to order.

 

[CrazyCooter]

First long trip out today with the rv. Towed my 17' 3500lb rv with with a dirtbike in the bed about 200 miles through the mountains......Amb temp was 101° in the valley, but as low as 68° once in the mountains.

She derated on EVERY substantial hill but the water temp did not go over 246°, so no limp mode 10mph! I pulled over at every opportunity to let the line of traffic that backed up behind me go by. Pretty embarrassing as I've never had a vehicle that went so slow up a hill with such a small load.

Load pid was 50-51%, so obviously I was only getting 50% power despite my foot was to the floor and trucks were trying to run me over......

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