Speed density vs VE, '88 electronics, thoughts..

[lookin]

My 95 3.0 doesn't have a charge temp sensor at the plenum, and I was wondering why they don't put them in anymore.

Does anyone know, what sensor information is used in it's place, if any? Or does anyone know what sort of changes they made to the SBEC, so they could make such a change in sensor configuration?

My 95 3.0 also has a separate sensor, next to the coolant temp sensor, that tells the fan when to turn on. I think that one is a Lower Intake Temp Sensor, because it doesn't go into the coolant like the coolant temp sensor.

So does the ECU extrapolate, based on those two sensor readings along with 02 sensor readings, to figure out the same sort of info it used to get directly from the Charge Temp Sensor? What advantages or disadvantages does the newer sensor configuration have?

[lookin]

Would someone please be kind and answer my above question?

Thanks

[Ondonti]

Im not sure what you mean when you are talking about those two sensors......

There are two coolant temp sensors. Both touch the coolant.

-The big one talks to your ECU and controls the fan etc.

-The small sensor is what runs the coolant temp gauge in your instrument cluster.

[lookin]

Oh. Yeah that's right. I completely spaced that.


What about the charge temp sensor part of my question?

[lookin]

Thanks very much for cluing me about the coolant temp sensors Ondonti.

[DustyR/T]

If equipted, the charge temp sensor just fed the ECM information about density (temperature) of the air which helped adjust air/fuel on one more fine scale. The 3.0's either did or didn't have them. Most did not before 96 because 96 was the year OBD-II arrived along with all the other cooky sensors everyone compains about today to keep vehicles running well.

Quote:

Originally Posted by lookin My 95 3.0 doesn't have a charge temp sensor at the plenum, and I was wondering why they don't put them in anymore. Does anyone know, what sensor information is used in it's place, if any? Or does anyone know what sort of changes they made to the SBEC, so they could make such a change in sensor configuration? My 95 3.0 also has a separate sensor, next to the coolant temp sensor, that tells the fan when to turn on. I think that one is a Lower Intake Temp Sensor, because it doesn't go into the coolant like the coolant temp sensor. So does the ECU extrapolate, based on those two sensor readings along with 02 sensor readings, to figure out the same sort of info it used to get directly from the Charge Temp Sensor? What advantages or disadvantages does the newer sensor configuration have?

[lookin]

Quote:

Originally Posted by DustyR/T If equipted, the charge temp sensor just fed the ECM information about density (temperature) of the air which helped adjust air/fuel on one more fine scale. The 3.0's either did or didn't have them. Most did not before 96 because 96 was the year OBD-II arrived along with all the other cooky sensors everyone compains about today to keep vehicles running well.

Thanks Dusty. I figured as much. I was wondering if the ECM uses an average of other sensors data, to accomplish the same purpose, when the charge temp sensor was not included?

I was also wondering if the ECU on my 95 3.0 may still have connector pins, for the old charge temp sensor on the harness, and if it would do any good to try and modify the current going to it with a resistor or something?

I gather that the ECU would learn to compensate for that also though. The performance increase I get, from the 'B&M command flow' unit I installed, only lasts about a day. The higher fp makes a real difference for a short time though. I wish I could figure out how to easily get around that. If I now understand this thread though, so do all of you guys, and I am asking about this stuff just to make sure. All of this is obviously still as clear as mud to me.

One more incredibly stupid question:

Is it called the ECU in my 95 3.0 instead of the SBEC? Or is that a whole nother thang or what?

Thanks for your answers Dusty.

[c2xejk]

ECU = Engine Control Unit. It is a generic name for an engine controller.
SBEC = Single Board Engine Controller.
SBEC II = 2nd generation Single Board Engine Controller.
SMEC = Single Module Engine Controller.
PCM = Powertrain Control Module. (Engine and transmission controller)
TCM = Transmission Control Module.
ECM = Engine Control Module.

[lookin]

sigh

[c2xejk]

If you go to a junk yard/parts store and ask for an "SBEC" the guy will likely just stare blankly back at you. If you ask for an "ECM"/"ECU"/"Engine Control Module", the guy most likely start typing.

[lookin]

Ok. Thanks Ed.