ELECTRONIC BOOST LOGGING FOR 1st GEN ECU
Just a short FAQ on an easy mod for adding a boost signal for anyone using either the MMCd or Shiver's SW on a 1G ECU. The mod takes advantage of an unused EGRT sensor on all of the Federal ECU's.
Many thanks to Jeff Lucius for putting the bug in my ear on an earlier post about an "unused input."
8/10/04 Thanks to RDMelton for pulling together additional instructions / pics on a web page.
http://rdmelton.autoeducation.com/ca.../boostlog.html
FAQ
EGRT ECU input is just a 0-5 VDC input signal on the ECU. ECU doesn't care whether it is a boost signal, wideband O2, oil pressure or fuel sensor. MMCd and Mirage Datalogger have sensor configurations to correctly scale either the 2.5 or 3.0 BAR MAP sensors.
For those of you running PocketLogger, ask them to get on the ball and provide user scaling options for the EGRT input.
WIRING
Only 3 wires to get boost logging working. +5V, Ground and signal.
Note: EGRT input has 10K ohm resistor to +4.5V to provide excitation for the EGRT sensor. This is why the logger will show raw data of ~229 counts or 90% of full scale before you connect anything to it. (If your connect the EGRT signal to EGRT ground the count will go to zero.) THe 10K pullup resistor does not have any negative effect on the accuracy of the MAP sensor.
MAP - HARNESS 3SI Updated color codes from RDMellon - Thanks!
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+5V - TPS Connector (Green/Yellow)
Ground - EGTR Connector (A22 - Black)
Signal - EGTR Connector (A22 - Light Green/Black)
A-22 Connector is located near the injector resistor module - may be taped up with some other wires.
MAP - HARNESS DSM (DSM info from QuasiMondo - Thanks!)
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+5V - TPS Connector (green/red)
Ground - EGTR Connector (green/black)
Signal - EGTR Connector (blue/yellow )
GM SENSOR INFO (provided by Jeff Lucius)
The GM 3-bar MAP sensor is available from MSD Ignition. Search google for MSD2313 or MSD-2313. The store below sells it for $49.70
http://www.aquamist.co.uk/sl/plist/p...6/806-666.html
You'll also need a socket/harness connector. Conduct Tite (PN 85146) sells some that are a close match or that may need only a little bit of knife work to make the correct notch for the key on the sensor connector. See middle pic and red rectangle in the web page below for where notch needs to be added.
http://www.tognottisautoworld.com/se...UCT_ID=MSD2313
http://www.hondata.com/3barinstall.html
Better GM Map Connector - Thanks to Fakepower
AC delco Part #PT1035 .... here are some pics of the cable.
http://www.3si.org/forum/attachment....chmentid=41842
http://www.3si.org/forum/attachment....chmentid=41843
ALTERNATE SOURCE for GM SENSOR (Provided by TurboBob)
www.gmpartsdirect.com
Sensor part number 12223861
Connector # 15305891
AUTOMETER BOOST GAGE
If you have an AutoMeter Boost gage you already have a GM 3.0 BAR MAP sensor installed. All you have to do is connect the signal wire from the MAP sensor to the EGRT input on A22. (Only connect the signal line, not the ground.)
MOTOROLLA MPX4250AP MAP SENSOR
You can also use a Motorolla MPX4250AP 2.5 BAR sensor but you will have to either solder or find a suitable connector for the small leads and provide some mechanical protection for the sensor. (Consider using a .100" connector for easy attachment / service.)
PINOUT
PIN1 - Vout (Signal) Note: Pin 1 has notch on pin
PIN2 - GND
PIN3 - +5V
PIN4 - NC
PIN5 - NC
PIN6 - NC
ORDERING INFO
http://rocky.digikey.com/WebLib/Moto...A%20SERIES.pdf
Exact part number is MPX4250AP-ND. It is available for under $20 directly from DigiKey.
HISTORY
Boost signal on ECU-EGR input for logging
MMCd V1.6F posted 3/17/04
http://www.3si.org/forum/attachment....chmentid=35334
More MMCd info / Latest versions
MMCd New Features
Clint