When do these trucks go into closed loop...I thought it was like 137*f or something like that?

I always used 160* stats in my older vehicles with no problems in New Jersey winters...I'm curious to see how often my efans operate with my 160 stat this winter

 

depends on the air temperature. at 0C (32F) for example, it will go into closed loop at around 60C which is 140F. at 10C and up, it will go into closed loop around 50C or 122F.

 

I thought warmer temps meant better gas mileage. You said yourself 195 is used for emissions, which should be lower when you're getting better mileage??

 

Are you serious? WTF did you put in your cheerios this morning? I live in NY and run a 160 therm, and ran it last winter for the first time -

Here's what I found -

1 - Your gas mileage goes to **** during the winter.
2 - The cab takes longer to heat up, and does not get as warm. Sometimes during races, and on the way to races, I found -28 degree weather, and had cold feet the whole time....
3 - In the summer it kicks *** - better gas mileage and performance gains. I just got 425 miles on 1 tank of gas on a road trip.

 

Oh yeah - and during the winter - no performance gains - mine WILL be coming out in the fall.

 

It looks lilke your problem is really the hypertech program that you use Mine did the same thing until Nelson Performance tuned it out!! Like I said, we have long and hard winters here as well!!! This whole eastcoast does especially down here in Balt/Wash. NO vehicle is going to take to the amount of things that you have, named in your signature, properly unless they are tuned in for it. Look at my sig you have about the same amount of stuff and like I said I HAD similar problems!!

 

Check my new thread -

 

warmer temps equal detonation. the higher temps just cause the fuel to keep burning not only throughout the combustion cycle (ok, maybe a little better mileage but not much) and through the exhaust.

like i said earlier, go to the happy medium and get a 180. it will drop your temps a bit and still give you the best of both worlds.

 

FWIW, I've been noticing that everyone's gas mileage seems to be going to **** in the winter for about the last 5 years ever since the C.A.R.B. has the colder climates using winter blend fuel...our customers come to the shop complaining about it all of the time.

I've always had great heat with 160* stats in the past, and it comes up super quick since the coolant is flowing through the heater core sooner. It may be a different story this winter with this truck since the stat seems to have a bit of a different design to it to make it a 160* than the one's I've used in my small block Chevy's of the past. I noticed when I was installing it that it was "spring loaded"...seems to rest on the housing keeping it partially opened...kinda like the BB mod. (my stat's an SLP...not sure if the other 160's out there are the same)

BTW, where in NY are ya? upstate?

 

I loose 1-2 mpg every winter due to reformulated fuel usage here in winter. If I go back to my mileage log, I can tell you the date they changed it at my primary station (or at least the date I first got RFG in my tank). Goes right back up in the spring.