That's pretty cool (pun intended), but the $56 is kinda hard to swallow for a t-stat.

Nice to know there is the high heat option and it actually does work.

Josh

 

You're one of the lucky few that see those kind of temps with the Ford t-stat. Alot of us have had problems with them 1) maintaining temps at anything above 188 and 2) they seem to weaken with age. I don't know if it's the thermostats themselves or something else causing it.

I know, I will be doing an oil cooler replacement sometime in the future....however, something I noticed today....I normally have consistant 12-14 deltas on similar drives but has always cooled down quickly when exiting the highway. Today I averaged 8-11, which makes absolutely no sense. ( it did hit 14 once, but quickly dropped down) More drive time will tell if that's a fluke or not.

 

My truck would only get to 186-188 ect on highway cruising in the summer heat...I feel a diesel should run closer to 200. Personal preference on my part.

 

LOL, I wish I only paid $56....like an idiot, I got excited after Bismic found the things, and ordered directly from Mishimoto.....but, with a lifetime warranty, it may be a deal at $56. Who knows....time will tell.

 

Makes sense. I need to log my stuff again and watch. I haven't for a couple months now. Last I knew I was running around 194 ECT and 199 EOT.

 

I put in a new Ford stat and it's back to the same olde crap as I had,so I will be doing this mod. I want a 12 mile heat up not a 20

 

Is it a fail safe t-stat? Sorry if it was mentioned....

 

That's a very good question.... can anyone tell by looking at the pics? I'll contact Mishimoto and ask.

EDIT: I've left message with Mishimoto, I will update about the failsafe when I hear back from them.

EDIT #2: Mishimoto says the t-stat will fail open.....meaning you would see cooler temps, not overheat.

 

That's exactly what I thought a few months ago when I replaced mine. 186 just like everybody else...that just doesn't seem like enough.

I wanted to change the t-stat twice anyway.

 

"Fail Safe" is a product by Motorad. It simply has a clip that locks the stat open when/if the vehicle overheats. I've had a couple of these and changed out a few more, they are junk. They fail early and often without any overheating. Any thermostat can fail open if it gets a chunk of crud in in or the spring breaks and it will fail closed if the wax in the center part gets cooked or leaks out from corrosion. There is no thermostat available that I'm aware of that will push it's self open if it fails in the closed position.

I have this 200° thermostat and a Misho radiator on order. I don't expect any issues with the PID's but I'll let ya know if it does anything weird. Just hoping it fits right..

 

Interesting, I guess I ASSumed that the Motorcraft t-stat in our trucks failed in the open position causing the low temps we typically see. Not the case?

 

It might be more common for it to fail in the open position. When mine failed it wouldn't get over 120.

 

Maybe the metallurgy of the spring is designed to weaken over many thermal cycles in an effort to increase the odds of the thermostat being replaced before it fails, but there is nothing about that plan in any sales literature I've ever seen. (It seems like they design a lot of stuff to fail at a certain point these days- from car parts to toasters)

 

So is the consensus that 200* ECT is optimal at 65-70mph? Or there abouts? That's what I've been seeing on my '06. I don't know what thermostat I have, but I definitely run hotter than 186-192 at highway speeds. My temp spreads are always 4-9 at that ECT.

 

You're good in my opinion.