3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Cooler heater and more engine wear is the only benefit from the 180 thermostat.
If it was a race only vehicle, then colder is better. You need the heat of the stock thermostat to seal the rings at their best and keep the oil from wanting to sludge up.
Not a wise investment on a late model engine with such tight tolerances.
I will contest this, I have had a wideband on my truck at KRC Performance. With CAI and Tuner with a Performance tune on my truck already, the addition of LT headers all worked to lean me out quite a bit. Not CEL lean, but fairly close.
Marty suggested I go to a 180* thermostat to keep the truck in closed loop, in which, the PCM will richen the mixture slightly (just as happens when your truck is warming up.
Worked for me, the change to the cooler thermostat brought me almost up to bone stock, factory A/F ratio.
I have NO numbers with just a CAI and performance tune (both act to lean the mix, one via more air entering the TB, the other by advancing the timing) but since my truck was still not lean enough to produce a CEL with LT headers as well, I don't think you are so lean that you NEED one.
For me, it's a band aide, since the only real way for me to richen the A/F would have been to get a piggyback A/F controller or a custom tune. The $20 thermostat is a much cheaper solution...
that actually makes sense. how would keeping the engine cooler keep it closed loop? that's the opposite of what I would think would happen.
Sorry 'Feej, I were watching the Giant game whilst typing your reply, meant to say that the cooler t-stat would keep from entering closed loop...
I am getting too many logs on the fire, the other day I had guy buy 10 quarts of fluid for his diffs. I told him the rear took about 4.75 Qts and the front slightly less. Of course I meant to say pints... lol........................
Last edited by HammerZ71; 11-22-2009 at 06:37 PM..
thanks guys I know there is a little bit of a debate over this. With the predator tuner and the CAI do you think my truck is really running lean at all? I would think the predator would add fuel to make the correct ratio, am I wrong on that? Thanks again.
If you fit a 180 in the depths of Winter........be prepared for very cold feet and some codes to be thrown.
I did this in the UK when temps were like 2-5 deg C and although it did add a "little pep" It hurt my mileage 2-3mpg and my heater was sooooo cold!
Not worth it in my case.
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Many guys who've done the cooler thermostat thing in northern climates routinely switch back to the regular one for winter. That was a standard thing way back when I was a mere child growing up in upstate NY back in the 80s...
To add to this thread, since you are running the DSP on a 93 tune, adding the 180* T-Stat may richen it up to much. After adding LT's on mine with the DSP on the 91 tune, contrary to what I have read about adding headers with a tuner I am running rich. After searching around on a few different sites, I am not the only one who is running rich after installing my LT's with a DSP, while others running the same headers with a superchips are running lean.
It's pretty much a guessing game unless you have a wide-band or a shop to go to. I have the luxury of being only about 5 miles from one of the highest regarded Mopar performance shops there is for the half of the year or so that I'm in florida.
I'd not be messing with ANY mod to adjust A/F ratios unless I knew exactly where it was to start with...
Last edited by HammerZ71; 11-23-2009 at 02:14 PM..