DIY_EFI Digest Wednesday, December 1 1999 Volume 04 : Number 669 In this issue: Basic electronic stuff Haltech data logging question? Sunbird wiring Grand Prix Turbo wiring diagrams See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Wed, 1 Dec 1999 07:17:40 -0500 From: "Posea, David G, SITS" Subject: Basic electronic stuff Some of you may remember I am working on a boost retard device based on a PIC controller for the Ford DIS ignition. I found a good trigger circuit that goes to logic 1 when the EEC grounds the trigger wire for a coil. My question is how do I handle the "open" state on the output side of the controller? This is the negative side of the coil. If I attach it to an output pin out on the PIC, won't I be feeding Vbat (+13V)into that same pin from the coil side? Can I just set the output pin high until time to fire the coil, then ground it? Or do I need to use the output as the input to a transistor to switch the negative coil wire to ground? Something seems wrong here, and I'm not sure what it is. I'm a programmer by trade with limited electronic knowlegde. Thanks in advance for any help. David Posea ------------------------------ Date: Wed, 1 Dec 1999 10:50:00 EST From: A70Duster@xxx.com Subject: Haltech data logging question? I have a Haltech F3 series on a Chevy engine. Works fine but I'm trying to view the saved data with the data logging feature. I believed the data is saved in a binary format, and I'm trying to get it into an Excel type of program. Any help converting the file?? Thanks Mike ------------------------------ Date: Wed, 01 Dec 1999 12:15:35 -0600 From: steve ravet Subject: Sunbird wiring > > Date: Tue, 30 Nov 1999 22:19:58 -0700 > From: cwagner@xxx.net > Subject: Sunbird wiring > > Does anyone have a wiring diagram for a 2.0 Sunbird using the > 7749? Need it for a conversion. Also, does anyone have a list of > where the data tables are located on the chip? You're in luck, I just uploaded this yesterday from Bruce. Sent a note to GMECM I think, which is the better place to ask. Anyway, go to the diy_efi WWW page, (efi332.eng.ohio-state.edu/diy_efi), click on ftp site index, then scroll to the bottom for schematics. As I understand it, this sunbird ECM is the same as syty, in which all tables are known. There's even a shareware program for it for editing bins. check www.syty.org or something like that. - --steve - -- Steve Ravet steve.ravet@xxx.com Advanced Risc Machines, Inc. www.arm.com ------------------------------ Date: Wed, 1 Dec 1999 12:08:26 -0700 From: cwagner@xxx.net Subject: Grand Prix Turbo wiring diagrams I earlier wrote about needing wiring diagrams for the Sunbird. I goofed, I found them on the ftp area. What I needed were from a 89 or 90 turbo Grand Prix. I understand that the computer used is a 7727 which is the sane as the 7730. Does anyone know where the wires go on a 730 computer. I don't have a 727 but I do have a 730. ------------------------------ End of DIY_EFI Digest V4 #669 ***************************** To subscribe to DIY_EFI-Digest, send the command: subscribe diy_efi-digest in the body of a message to "Majordomo@xxx. A non-digest (direct mail) version of this list is also available; to subscribe to that instead, replace "diy_efi-digest" in the command above with "diy_efi".