How much timing does the EEC-IV add?

slvr302 · Sep 26, 2004

How much timing does the EEC-IV add? I know I have seen this posted before but couldn't find the info when I searched.

90mustangGT · Sep 26, 2004

TTT

slvr302 said:
How much timing does the EEC-IV add? I know I have seen this posted before but couldn't find the info when I searched.

Good question. I'd like to know. I belive that a chip or computer tune can effect the parameters, but what I would like to know is there a curve or does it advance the timing so far until a certian RPM and stop or does it just keep advancing timing as the rpm rises?

HISSIN50 · Sep 27, 2004

i too would be interested in tables if there are any. the amount of timing will depend - there are tables for open loop/part throttle operation. then the WOT tables. then the cruise tables with EGR (lots of extra timing). and so on. the amount of timing also depends upon the ECT temps being relayed. i often think it is more variable than not (not really at all like mech advance mechanisms, but ever fluid and changing).

giddyup306 · Sep 27, 2004

I think under WOT conditions it raises timing to around 30* BTDC. Not 100% though.

HISSIN50 · Sep 27, 2004

giddyup306 said:
I think under WOT conditions it raises timing to around 30* BTDC. Not 100% though.

that sounds about right. do you think it dials in more for a full flow of EGR gasses?

giddyup306 · Sep 27, 2004

HISSIN50 said:
that sounds about right. do you think it dials in more for a full flow of EGR gasses?

Don't know if this helps or not.

The PFE sensor, through its internal electronic circuitry, provides an analog voltage signal to the PCM that the PCM can compare to values on its lookup table and determine EGR flow. The PFE differs from the EVP monitors only EGR opening. The EVP leaves the PCM to assume there is no carbon buildup or other restriction hampering EGR flow. While this may be true for newer engines, it is rarely the case for those in service for any length of time. The PCM uses PFE info to fine tune its controll of EGR valve opening, more accurately controll a/f mixture and modify ignition timing.

Make any sence?

89CopCoupe · Sep 27, 2004

Never seen it in verifiable writing, but according to the math (from articles) the EEC adds about 20* onto initial at wot.

HISSIN50 · Sep 27, 2004

giddyup306 said:
Don't know if this helps or not.

The PFE sensor, through its internal electronic circuitry, provides an analog voltage signal to the PCM that the PCM can compare to values on its lookup table and determine EGR flow. The PFE differs from the EVP monitors only EGR opening. The EVP leaves the PCM to assume there is no carbon buildup or other restriction hampering EGR flow. While this may be true for newer engines, it is rarely the case for those in service for any length of time. The PCM uses PFE info to fine tune its controll of EGR valve opening, more accurately controll a/f mixture and modify ignition timing.

Make any sence?

that is a nice synopsis and makes sense, though that is more about the function of the system. basically (in my crude simplistic thinking) the PFE system is one component that tells the EVR how much EGR gasses to introduce (not unlike feedback from an O2 with regard to fuel trim).

all of this is interesting stuff.

nito88stang · Sep 27, 2004

Go To http://www.tweecer.com/downloads.htm

Download the program and the .bin files for the 'puter you're running. You can look at all the stock parameter and curves if youre really interested.

The software is free and lets you get a real in depth look at the EEC's innner workings

tmoss · Sep 27, 2004

Just remember when you look at those tables that the timing shown is total timing and asumes a 10* initial base setting. Most of us wind up at ~14-18* intital which is ~32-36* total timing.

slvr302 · Sep 27, 2004

what do you use to open up the file? They are a .BIN

tmoss · Sep 27, 2004

You use the program Cal Edit and one of the source files is a drop down that lets you switch to a .bin file which you then choose from thje bin files you downloaded.

How much timing does the EEC-IV add?

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