DIY_EFI Digest Monday, April 3 2000 Volume 05 : Number 134 In this issue: Re: data logger files - software to read them Fw: MSD sellin Crap Still See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Sun, 2 Apr 2000 14:26:04 -0500 From: "alexpeper" Subject: Re: data logger files - software to read them I am not sure about obd1 but GM obd2 uses manufactured defined data packet numbers not memory address, offset or parameter number to request data. All models and years have different or same request numbers, yet report back the same data and scaling. Thus if you made a request for data item 0812 rpm you would get water temp for one car and mph for another. You would need specfic data request tables for each car, or GM could be using a decryption formula based on model and year. This does not seem to be easiest way espically for the scan tool. Ford request values apply the same to all years and models, thus if you request rpm for one car you will also get rpm for another. I have also heard that GM does same with some maunfactured defined trouble code numbers. where the same number will have different definitions for different year and or models. Alex Date: Fri, 31 Mar 2000 09:56:50 -0600 (CST) From: Roger Heflin Subject: Re: data logger files - software to read them The GM data encoding is not in any way shape or form and encryption. It is simply a encoding of what data bits are what. Encryption denotes someone attempting to make the data hard to deal with, I don't believe they did that, I believe the just encoded the data the easiest and quickest way. Their scalings are based on what ranges the sensors have and how many bits they have to encode the data in. THey also have limited space for the error flags, so to make the messages all be the same, they would need to have more bytes in the data stream (alot of which are unused) and would have less frames per second. Roger - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Sun, 2 Apr 2000 19:38:54 -0400 From: "nacelp" Subject: Fw: MSD sellin Crap Still Forwarded from another list EFI related in that you need an ignition sytsem to run most EFIs Grumpy > Spent almost $80 for a set of dam plug wires. The dumb ba$tards that sell > this $hit, can't be bothered to include the right crimper. I'm pi$$ed, with > getting expensive crap from these a$$holes. Makes about three times I > bought their stuff, and never does it work as claimed. $hit, ya can't even > put it together (ed note. properly), with what they supply. Well, back to using my old STINGER > PLUG WIRE CRIMPER, poor thing is like 30 years old, customer has to supply > hammer to use effectively. I fell like neandethal (?) beating plug wires > together. MSD Terminals so short you can hardly hold them in place to beat > together. > Beats me how these jerks stay in business. > I hate it, I hate it, I hate, spending good money, for CRAP. > I should have stuck to the Crane's like I wanted. > *##( )($#()@# )#($#)(ing MSD > Bruce - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ End of DIY_EFI Digest V5 #134 ***************************** 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".