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Originally Posted by RavenTai
So your gauge has been reading low since the mod correct? If you are maxing out at 181f that would fit, the gauge is suppose to center around 189 and this seams to be a pretty good center for most of us, yours seams to be running a bit cooler.
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The truck has been running this way since the mod, the gauge vs. ECU readings have also been consistent.
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Originally Posted by RavenTai
Thermosat Specs per the FSM
Valve opening temperature: 80 – 84°C (176 – 183°F)
Valve lift: 10 mm (0.39 in.) or more at 95°C (203°F)
Depends on how you look at it, it is suppose to crack open at about 179.6 I do not think that if yours was opening at 179 it would only be at 181 by the time it got to the end of the head (where the sensors are) I think your thermostat may be opening early probably not a big deal and maybe not worth futzing over, close enough and on the good side.
Have you replaced your thermostat yet? Was it OEM?
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I completely flushed my cooling system (back and forward, maybe sideways too) and replaced thermostat, fan clutch, couple of hoses, and filled with distilled/toyota red some 2000 miles ago, and had a quick partial drain/refill when I r&r'd the PHH a couple weeks ago.
I would not be surprised that I am running at the cool temp I am, but it does seem that my gauge position is lower by ~10F at the same actual temp as other modders. So I think the gauge is accurate, but my range is 140 (pegged cold) to prolly 234 (pegged hot) by extrapolation. Accurate enough for me, but an interesting variation nonetheless!
Either way, I'm VERY HAPPY with this mod, thanks to all who contributed!