Topic: Engine Parameter Information.

[NCChuck]

Been meaning to ask this...Through various devices we are blessed with a lot of engine information but...sometimes we do not know or understanding what we see.
OIL TEMP: My car normally has an oil temp of 194 to 200 degrees F. What is the normal range for the oil temp? Anyone know? NOTE: FYI. When beginning with a cold engine when you reach what is a normal coolant temp for you Your oil is around 5 to 10 minutes from reaching it's operating temp.
COOLANT TEMP: My coolant temp normally stays around 194 to 198 degrees F. What is the normal coolant range?
AIR FUEL RATIO: Does anyone know what the normal AFR is?
LTFT. (Long Term Fuel Trim.) During the winters colder temps my LTFT was normally between between 0.0 and -3.0. Now with temps running in upper 80's and low 90's I find my LTFT mostly settles around 3.5 to -4.6 and is mostly around the mid -4.0's. It seems to me that during colder weather the trim would be higher instead of lower as is the case. Can someone explain this for me?
Thanks foe any info provided.
Chuck

[G8TR]

Your normal coolant range should run 194 to 198*. Living in Florida mine runs the same and most I have talked to seem to agree. Welcome to the forum. 

[Critterman]

The 2.0 is direct injection and runs a leaner A/F than a normal injected car.  I am not sure of the exact number.

I have not seen a pid to read oil temp, but I really haven't looked for one.  I would guess within 20 degrees on the water temp+-

Anything above 185 and below 220 on water temp can be normal depending on conditions and load.

The computer is constantly adjusting the fuel trims both long term and short term, I wouldn't worry about what you are currently seing.

[lil goat]

I believe you meant parameters, not perimeter and Critter is correct your temps all fall in the normal range, the AFR is very lean on the GXP, up into the 14's stock. Almost all the tuners won't go that lean, "it's just not natural" I am pushing Lyndon to go leaner, he did on my latest tune, runs very well but he is no where near as lean as stock.

[spicy3480]

Goat...I was seeing around 14.5 AFR on my Aeroforce Gauge.  It varies, but I saw it around that number a few times.

[lil goat]

You are reading actual AFR, that is very different from commanded AFR, actual is a result of conditions and can often be no where near commanded. If you were to actually tune the car on a dyno with the time, first thing you would do is read actual AFR and adjust the Volumetric Efficiency to make it equal to the commanded AFR. They are usually close on most cars, not so much on bikes where I learned how to tune. Lyndon sets the commanded AFR.

[Sol Asylum]

I can't say what "normal" oil temps on our cars tend to be.  My experience on air cooled engines ie aircraft engines with regard to oil temp has been this:  Usually manufactures recommend that oil temps be above 212F because if there happens to be any moisture present in the oil it will boil off and max oil temp tends to be around 230F for these engines.  Of course on an air cooled engine oil serves more of a cooling purpose in addition to lubrication then you will see on a water cooled engine.  Also aircraft engines tend to run much heavier weight oils.  Again this is just what I have experienced with air cooled aircraft engines.

What you are seeing with oil temperature lagging your coolant temps is normal oil is not as good a thermal conductor as water which means it will take longer to heat up and cool down then water.  You can also see this if you have an oil pressure gauge.  Your oil pressure will be higher when you first start the car and then will drop once the engine has warmed up.  This has to do with how the oil is changing viscosity which is directly related to the oil temp.

[spicy3480]

I'll have to look at my gauge for that one, as it reads commanded AFR also.

[1LILNDN]

I have an Oil pressure gauge and when I first start up its around85-100 .once its warmed to normal its about 25.water is about 194 f

[lil goat]

I'll have to look at my gauge for that one, as it reads commanded AFR also.

That's pretty cool if it does, I didn't think it would be able to read the Bosch ECM, that is a table Lyndon sets. Actual is read from the O2 sensors. If you can look at both at the same time it might be very useful info.

[SolNut]

That's pretty cool if it does, I didn't think it would be able to read the Bosch ECM, that is a table Lyndon sets. Actual is read from the O2 sensors. If you can look at both at the same time it might be very useful info.

My DashHawk II shows Both, think I have it on Screen #4 (+/-). Also Coolant and Oil Temps on #6, I think.

Temps run within 10 F of each other, usually ~189 F (Normal Driving)[Saw Water @ 206 and Oil @ 204 on TOTD], AFR changes proportionally to the Angle of the Right Hand, Floor Mounted Input Device.  

Steve