180 degree thermo for jk - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 7 Old 09-14-2012, 06:27 PM Thread Starter
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180 degree thermo for jk

Does anyone know if the ecu's on the 11 jk's are programmed to run at a certain temp? I'm wanting to pick up a lower temp thermo for my wrangler
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post #2 of 7 Old 09-14-2012, 06:39 PM
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The fan will try to regulate a certain temp. What are you looking to gain by going to a lower temp thermostat? I'd do a search before going too far, there really aren't many actual benefits in doing this on a stock application. Perhaps RIPP can shed some light on that, but I know many Hemi owners are reducing mpg by doing this. Engines also wear less at higher operating temperatures.

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post #3 of 7 Old 09-14-2012, 06:59 PM
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When there is adequate air flow through the grill due to forward movement, the water temp will hover around the thermostat rating, be it 180F or 195F.

With less than adequate air flow through the grill, as in traffic, and off road, the water temp will be between 195F and 215F, as that is what the ECU is programmed to maintain through electric fan cycling.

If you are trying to lower the engine temp off road, a lower temp thermostat won't be what you want.

On my 2008 JK, I removed the electric fan, and installed a mechanical fan and shroud.
The engine hovers around thermostat temp, (195F), on and off road.
The auto transmission's temp is lower on and off road.
Under-hood temps are lower off road, which lowers the intake air temp.

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Last edited by ronjenx; 09-14-2012 at 07:03 PM.
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post #4 of 7 Old 09-15-2012, 12:21 AM
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Id look into a different fan before a thermostat. like Goody said, Newer engines are designed to run at a certain temp range, and switching thermostats might actually hurt your engine more than it will help. Not to mention, if you live in a state (like CA) with strict emissions control, you might have problems with smogging it if its not running in the temp range it was designed to run in. Coolant/engine temp is one of the factors the ECM takes into account for spark advance and fuel flow rates so by changing the temp parameters you can adversely affect fuel economy, performance, etc. Not saying its an absolute guaranteed thing, but its possible. By going to a higher volume fan, it will cycle when the ECM tells it to and cool your engine down quicker when it decides it needs to cool it down and will be more effective in keeping temps down when necessary.

Not sure where you live but I'm in SoCal in the valley (virtually could be considered desert lol) where temps hang around 105+ all summer long. I have a lift with 37's and such and my jeep runs around 200-216 but my temp gauge never moves once it warms up. The fan does cycle on and off but I have yet to see it even try to over heat, even when crawling off road where theres no wind and temps are easily over 100 degrees. Id say if anything get a different fan or get some more ventilation to your engine compartment but idk that id mess with a different thermostat.

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post #5 of 7 Old 09-16-2012, 04:15 PM Thread Starter
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I live in Iowa, but I just installed a winch and lights on the front end which I'm positive are diverting a decent amount of airflow, I noticed while driving my temp was running a little bit higher than normal.
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post #6 of 7 Old 09-16-2012, 04:16 PM Thread Starter
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Ron, how did you go about installing a mechanical, I'd really like to go about installing one on my 11 if I can
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post #7 of 7 Old 09-16-2012, 05:48 PM
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Quote:
Originally Posted by mhill11 View Post
Ron, how did you go about installing a mechanical, I'd really like to go about installing one on my 11 if I can
This thread should get you started:
https://www.jkowners.com/forum/showthread.php?t=76475

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