Hi Guys!! So the combination of fans coming on sooner ( not sure the temp to reprogram) and the 160 stat cruising at 45mph or more does it work to keep temp around 180. The ECM starts pulling timing at 190* that’s what I would like to stop. Thank you!

 

You would need a Tech II to reprogram the fan starts etc.

 

Agreed! I’m sure someone out there has done this mode and want to know
If there are any negative ramifications and if in fact 180 is achieved?

 

190? I thought it pulled timing at about 212, also thought the worse culprit was the IAT pulling timing at only 86 degrees ? I could be wrong ...

 

Well at least that what I read, 190 starts pulling timing. Hopefully someone can verify this. I could be wrong as well.

 

Where did u hear this lol.

It's your ITA temps that you need to worry about more ...

But to answer your questions I have the 160 degree thermostat and have modified my fan speeds ....most the time my car runs at 185 - 190 but will climb up to 220 in hot weather and traffic , nothing will stop this ....unless you put in a better radiator ..I did the mod as i just did not like my car hitting 230 in traffic ...and it cools down real fast once you start moving ...
Dave

 

Did u find someone with a tech 11. I read it in here CF

 

Can someone tell me at what temperature our engines begin to pull timing?

 

190 I have read but maybe someone who really knows will chime in. But that would mean I have never driven with full timing!

 

I don't understand your question ??

if you are talking about adjusting the fans speed and the temp that they turn on ... I changed them in the Tune with my Diablo . I don't think the TECH II can adjust fan speeds as it it's a diagnostic tool . I have a TECH ll , I will check but I am pretty sure you have to do it in the Tune

Dave

 

The ECM does not pull timming at 190 , hell if that was the case then everybody who has a vette is running around with pulled timing ... the factory thermostat is a 190.......

the ECM pulls timing when the IAT's rise above 85

Dave

 

I ran the 160* stat and during Winter here in sunny California the water temp was usually below 180*.

I found this to be too cool and put in a 180* stat.

Now i see 189*-194* usually but I have 4:10 differential gears and remember the water pump runs off rpms and I am about 300 rpms higher than stock. Gear selection will of course control the range. I can keep the coolant at 189* if i drop a gear and run higher rpms.

 

Exactly my point!! IAT’s rise above 85???

 

ECM will start to pull timing when:

1. The Intake air temperature reaches 86*F.

2. The Engine Coolant temperature reaches 212*F

When running a 160* thermostat, the fan setting must be adjusted. If you know someone who is knowledgeable with HPtuners software, they can do if for you. However, you have to pay a license fee to make changes on a tune file. No fee is required to just view the tune file.

The 160 T-stat will start coolant to flow sooner, which initially helps to keep coolant temps down. However, once the T-stat is fully open and coolant temps reach a certain point in city driving, it will not matter what T-stat you have. At that point, it is more important drawing cooler air through the radiator and/or increasing the radiators cooling capacity.

 

Good Clarification Mike .... I have never seen my logs pull timing when over 212 so that's new to me

I have seen the pull when the IAT's were hot ...

OP if you don't know anyone with HP tuners or don't want to pay for a tune, a DIABLO ITUNE will allow you to log and adjust the parameters you are looking to adjust plus many more . I like the ability to make my own fine adjustments and not depend on someone else or have to re dyno tune

If you are not going to do any crazy mods , maybe just headers & CAI , a diablo can be good investment .

You can get mail order custom tunes, make adjustments to many parameters yourself and data log but for anything more than the above mentioned mods , sell the DIALBO for almost what you paid for it and get a DYNO tune . its also safer for someone like me that does not KNOW the many adjustments in HP tuners that could get me in trouble

Its like tuning with training wheels lol lol

you can pick them up here on the forums for $200 to $250 and resell it for the same price when you are done

just my two cents ....

Dave

 

Thanks Dave!!

 

How about we use the information supplied in the service manuals rather than just guessing or hearsay.
From my '08 service manual:

The cooling fan duty cycle starts when coolant temps are 204 F and reaches high limit at 235 F. The fan is at 10% duty cycle at low speed and 90% at high speed and can be adjusted in 10% increments.

It also starts when the AC pressure equals 160 psi and is at high speed after 360 psi

At oil temps of 302 F or above the fan will run at full speed.

At transmission temps of 270 F or above, the fan will run at full speed.

When the engine is shut off and the last readings of coolant temps is greater than 235 F or AC pressure greater than 249 psi the fan will run at 50%. If the coolant drops below 230 F and the AC pressure drops below 241 psi the fan will shut off. The fan will also shut off in 2 minutes regardless of coolant temp.

The DIC will display COOLANT OVER TEMP when the temp is over 256 F. The IPC will also light the CHECK GAGES lamp and a chime will sound.
If the coolant temp exceeds 270 F for more than 10 seconds it activates a type A code (P1258) and disables half the cylinders by shutting off fuel. (aka limp mode)

There is no place I find that indicates timing will be affected by coolant temps.

The stock OEM stat is 186 F. It's designed along with the radiator capacity and water pump to remove approximately 1/3rd of the heat created.

 

Thanks HOXXOH , I did not think the ECM pulled timing on water temp .......

Dave

 

I would worry about my engine oil and tranny oil temp (Auto) getting up to operating temperature.

 

oil and trans. get up to temp fine , I was worried also but its fine ...Now remember I am down south where its warm , don't think I would have changed the thermostats if I lived up north

Dave