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Lower Temp Thermostat

jetrinka said:
What about 220 degree coolant and oil temps is bad? Genuinely curious what you have to say.
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Personal preference. Id like to see 200 or below at cruising. 220-230 without a trailer seems awful warm for a motor that hasn't been worked.

In my hellcat there's a huge difference in performance between when my temps are 170-180 and over 200. Timing gets pulled and starts dumping fuel to try to cool things down. In an application like this truck, the longer I can keep it cooler the better off it will be in the long run. Thats not to say I want to keep temps ice cold because you run into over stressing parts that aren't up to operating temps. 190-200 is a nice middle ground with plenty of room to beat on the motor if I need to when pulling a trailer without worrying about temps creeping up. Currently i see 220f coolant and oil temps unloaded which is a bit concerning to me.
 
Im glad this has turned into a pissing match. You guys do what you want with your trucks and I'll do what I want with mine. Like I said above, if you cant point me in the direction of a lower temp thermostat, keep it moving.
 
jetrinka said:
So you have no concrete data other than comparing a naturally aspirated engine to a forced induction engine. Got it.
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Same thing on my 5.7 in my ram I raced. Anything above 200* and it pulled timing. Same thing on my 6.4 in my challenger I raced, pulled timing above 200*. Same thing in my 5.7 in my charger, pulled timing above 200*. I can go on.. do you want me to pour through the 1000+ logs i have on my laptop? Hell, shoot me your email and I'll send you all of them since youre so invested.
 
Rockcrawlindude said:
Nothing. It’s designed to run that temperature that’s why it has a 216° thermostat
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My hellcat, charger, challenger, and ram all were designed with a 200* thermostat and absolutely ran better with a 180* thermostat in pretty much every scenario.
 
trizzle said:
Same thing on my 5.7 in my ram I raced. Anything above 200* and it pulled timing. Same thing on my 6.4 in my challenger I raced, pulled timing above 200*. Same thing in my 5.7 in my charger, pulled timing above 200*. I can go on.. do you want me to pour through the 1000+ logs i have on my laptop? Hell, shoot me your email and I'll send you all of them since youre so invested.
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Well then I'd say that either your race vehicles have hardware that doesn't agree with your tuning, or your tuning sucks, or perhaps both.

As someone posted earlier the thermostat has an internal heater capable of opening the thermostat at a much lower temperature than otherwise when high load conditions exist. I guess I'll throw you a bone - here is some literature straight from Ram.

"THERMOSTAT OPERATION: The Electric Heated thermostat operates as a dual function thermostat. During normal engine conditions the thermostat operates exactly like a typical high temperature thermostat. When the engine reaches approximately 102°C (215.6°F) the wax pellet expands and the thermostat begins to open. The thermostat will be fully open at approximately 115°C (239°F). When engine load is increased and the PCM requires increased engine torque, the PCM energizes the electric heater inside the thermostat which causes the thermostat to start to open at 85°C (185°F). The PCM controls the thermostat heater operation with a High Side Driver (HSD) Control."

It seems that you can have your cake and eat it too.
 
jetrinka said:
Well then I'd say that either your race vehicles have hardware that doesn't agree with your tuning, or your tuning sucks, or perhaps both.

As someone posted earlier the thermostat has an internal heater capable of opening the thermostat at a much lower temperature than otherwise when high load conditions exist. I guess I'll throw you a bone - here is some literature straight from Ram.

"THERMOSTAT OPERATION: The Electric Heated thermostat operates as a dual function thermostat. During normal engine conditions the thermostat operates exactly like a typical high temperature thermostat. When the engine reaches approximately 102°C (215.6°F) the wax pellet expands and the thermostat begins to open. The thermostat will be fully open at approximately 115°C (239°F). When engine load is increased and the PCM requires increased engine torque, the PCM energizes the electric heater inside the thermostat which causes the thermostat to start to open at 85°C (185°F). The PCM controls the thermostat heater operation with a High Side Driver (HSD) Control."

It seems that you can have your cake and eat it too.
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Tuning is spot on unless one of the top tuners in the hemi community with several gen 3 hemi records doesnt know what he's doing and about 60k miles on my current vehicle with several hundred passes in the low 9s at full weight without so much as a hiccup.

Actually useful information though so thank you. Glad to see this forum isnt full of dick measurers (sarcasm).
 
The cooling stack on the HD 6.4 is way over engineered. The temperature is definitely not an issue. Towing 13k up mountain passes in the summer at 65 MPH doesn’t change the temperature from what it is unloaded.
 
trizzle said:
Tuning is spot on unless one of the top tuners in the hemi community with several gen 3 hemi records doesnt know what he's doing and about 60k miles on my current vehicle with several hundred passes in the low 9s at full weight without so much as a hiccup.

Actually useful information though so thank you. Glad to see this forum isnt full of dick measurers (sarcasm).
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Then maybe you should ask your tuner to do the same on your truck that he did on your "Race Cars".
He may have a solution in the tuning for the timing and thermostat opening.

Just a thought
 
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