I was wondering what the stock thermostat is at? I would guess 200 thanx:SNSign: I have seen many people go to a 180 degree! How do you know what temperature is a good one??
What Degree Thermostat in 4.6???
- Thread starter joshheat25
- Start date
The stock t-stat is "teh win." It's 192 or 195.. can't recall which.
In any case, anything lower doesn't allow the engine to reach operating temperature, and regardless of old schoolers who refuse to accept reality, today's engines make their power and run more efficiently at higher temperatures.
Running a 160 or 180 t-stat was a trick from the carb days.
With today's PCM's, and computer strategies that are dependent on proper operating temperature, it makes little or no sense to go cooler.
In any case, anything lower doesn't allow the engine to reach operating temperature, and regardless of old schoolers who refuse to accept reality, today's engines make their power and run more efficiently at higher temperatures.
Running a 160 or 180 t-stat was a trick from the carb days.
With today's PCM's, and computer strategies that are dependent on proper operating temperature, it makes little or no sense to go cooler.
menasci
Member
menasci
Member
Dark Knight GT
I can't get it up......ok that didn't sound right.
I run a 180* thermostat without any issues. Been that way for around 1 1/2 years now. If you get a cooler thermostat, be sure to program the ECU for the fan to come on sooner, as this will keep operating temperatures down a touch.
1LowGT
New Member
it allows a fatter fuel trim is why,it wont add a hundred horse but it helps especially with aluminum heads higher heat helps emissions which i dont care about.
jstreet0204
Active Member
The idea behind running a cooler thermostat is to let the engine run cooler. Here are some things to consider when lowering the ECT.
1) A cooler engine is less prone to detonation.
2) The EEC will add timing for a lower ect. (In the stock EEC stategy for my 99, the difference between a 180* ECT, and a 192* ECT is about 8 degrees of advance.)
3) In the EEC the fans are set as follows. (these need to be lowered to match the new tstat temp with a tune)
high speed fan on 228*
high speed fan off 224*
low speed fan on 208*
low speed fan off 206*
4) The EEC will not switch to its base fuel table until it reaches 180*, and will instead depend on the startup a/f table which is richer. This is not the same as switching to closed loop, since the EEC will still go into closed loop before it reaches operating temp.
IMO, I wouldn't recommend going any lower than 180*
1) A cooler engine is less prone to detonation.
2) The EEC will add timing for a lower ect. (In the stock EEC stategy for my 99, the difference between a 180* ECT, and a 192* ECT is about 8 degrees of advance.)
3) In the EEC the fans are set as follows. (these need to be lowered to match the new tstat temp with a tune)
high speed fan on 228*
high speed fan off 224*
low speed fan on 208*
low speed fan off 206*
4) The EEC will not switch to its base fuel table until it reaches 180*, and will instead depend on the startup a/f table which is richer. This is not the same as switching to closed loop, since the EEC will still go into closed loop before it reaches operating temp.
IMO, I wouldn't recommend going any lower than 180*
03ghoststang
Well-Known Member
yea definitely need some dyno proof! lol I get the Idea behind it! I guess the only way to see if it would help is if you dyno'd with the stock one then dyno'd with the 180
jstreet0204
Active Member
joshheat25 said:
You aren't going to see power from the tstat it self. The improvement comes from being able to add more timing.
KronicRacer
Member
jstreet0204 said:
^^exactly 160 is no good on stock applications its more for forced induction applications. stick with 180* like everyone else has said. ever since mine was installed it runs great.
H8IT4U
New Member
