DIY_EFI Digest Monday, 28 September 1998 Volume 03 : Number 444 In this issue: Re: Inlet manifold runner length Re: Inlet manifold runner length Re: Courses Ida Demo Re: D-jet, 68HC11 disassembler Re: questions on gm 1226867 DJU TBI system Re: D-jet, 68HC11 disassembler Re: diy_disassembler What is this chip 68HC25? See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- From: ChrisBourk@xxx.com Date: Mon, 28 Sep 1998 00:36:40 EDT Subject: Re: Inlet manifold runner length In a message dated 98-09-27 19:56:51 EDT, you write: << Hi All I am in the process of making a custom EFI inlet manifold for a straight six. I will be using a common plenum and a single throttle body or possible two throttle bodies not sure yet. Can anyone tell me the correct way of calculation the inlet runner length. >> Depends on where you want the power, long, power down low. Short, power upper RPM Christopher ------------------------------ From: ChrisBourk@xxx.com Date: Mon, 28 Sep 1998 00:46:53 EDT Subject: Re: Inlet manifold runner length In a message dated 98-09-27 21:44:04 EDT, you write: << Thanks Bruce But this doesn't help me. I have a program called ENGINE ANALYSER that will tell me the runner length for whatever application or tell me HP/Tor for different runner lengths but my question is where exactly to I measure the runner length. valve to plenum or valve to throttle body ???? >> Valve to plenum Christopher ------------------------------ From: Shannen Durphey Date: Sun, 27 Sep 1998 23:01:40 -0600 Subject: Re: Courses I've had some experiences with the Snap-On courses. They can be good, but it depends on the instructor. It's really hit or miss. I don't know what kind of situation you're in, but I think it's possible for non GM technicians to attend GM training classes. I'm very sure that they were training guys from the Air Force base here, and maybe Burlington Northern Railroad also. The 3 day SET class and the two day EFI class should give you a good (although specialized) base. Shannen Martin Powlette wrote: > > I came across a Snap-On page with training courses in all kind of areas > like EFI and scope reading etc etc they cost like 76.00 and some 152.00, > four and eight hour programs. My electronics needs some major tuning up > and I am not up to speed on the latest tech. Are these classes any good > or can someone suggest something else??? > I would really like some opinions as I would have to travel up to the US > to attend the prog. and can't stand wasting my time or money. Please > advice. I really wouldn't mind a > prog. at least a few weeks or more EFI, ABS, Scan tools ........... > > Martin ------------------------------ From: Alain Toussaint Date: Mon, 28 Sep 1998 01:28:32 -0400 Subject: Ida Demo >If anyone else has had the problems I have getting a copy of Ida >Demo from Datarescue, I got one that I'll forward you >It's 11 meg., and takes me an hour to download/send, so holler >if you can't get there from where your at. >Oh, and that 11 is zipped. >Cheers >Bruce Bruce,forward me the request the ida demo,i can download and forward it in 3 minutes or less,dont put up with a (quite painfull) 1 hour download. - -- alaint@xxx.org <--work now but it's temporary,this address will change when i'll put my second server online (it need a hard disk). alaint@xxx.ca <--always worked and will continue to work,this address will be relegated to backup duty when my server will be up. ------------------------------ From: wrm@xxx.za (Wouter de Waal) Date: Mon, 28 Sep 1998 08:02:31 +0200 Subject: Re: D-jet, 68HC11 disassembler Hi all r.e. Bosch D-jet: See http://users.iafrica.com/w/wr/wrm/d-jet.html for the list as published in the Bosch Fuel Injection Systems 1970-1979 Shop Manual. Includes 1976-79 Caddy and 71-75 Mercedes. r.e. 68hc11: >Incorrect. The every 6809 instruction is in the 68HC11, with the same binary >opcode. Not so. *Most* of the 6809 instructions are at the same place (i.e. opcodes match) but quite a few are not. So a 6809 disassembler will give you an idea of what's going on, but that's all. >Another comment: to the person that could only find a simulator for the >68HC11, the simulator has a disassembler in it and will work just find to >disassemble to code, it just takes a few (10-20) more keystrokes to get >the job done, but it works quite well. Blech! :-) Put in about 6 hours over the weekend, my disassembler is working. In Linux (DJGPP/DOS soon). For some strange reason Borland C wouldn't compile mem = (unsigned char *)malloc(65536) (grin - I know, it's DOS, not BC :-) >Go look on > >http://www.datarescue.com Hey, Orin, you know me, I'm cheep :-) Anyway, with my disassembler I can customise it if I want to... Wouter ------------------------------ From: Shannen Durphey Date: Mon, 28 Sep 1998 00:16:02 -0600 Subject: Re: questions on gm 1226867 DJU TBI system Stowe, Ted-SEA wrote: > > hi. > > I am slowly moving to put this gm 4 cyl 2.0 L tbi system on my 77 mgb. it is > out of a 85 Pontiac sunbird. > > I am trying to ascertain if I should worry about the following info. > I'd appreciate any advice. > > the EPROM/calpak I have thinks that it will be in a 2.0 tbi, non-closed > loop, no AC, 3 speed auto thm 125 automatic, with a 3:18:1 final drive. > > this is a 4 speed manual 1.8 litre, (no ac), 3.909 final drive. > should I worry about getting a different calpak and EPROM ? maybe something > with a manual trans ? > > how would I figure out what my calpak and EPROM choices are ? > GM dealership should be able to help. The closest match I can find is 85 cavalier/sunbird, 2.0l, 4spd trans, 3.32 final drive. Chip part no is 1228360. > I see that a mempak is used in later ECU models, is this some kind of > consideration? > > also I need to get an external fuel pump, in the required psi range. does > anyone have any good suggestions ? I know that the jetronic-d in the Porsche > 914 would work and is a vaguely similar size. I think it put out 20+ psi. > most of the pumps I see are internal pumps which I can't use. > Ran a GM TBI vehicle in for a "rescue" the other day. Called parts store, gave them required pressure range, they gave me an inline pump. This was a "pulse" type pump, and I'm told that won't work, but it did. > oh minor detail, the air cleaner, it appears that with my downdraft > manifold, I will be very close to the top of the hood already, so I have to > come up with some sort of plumbing that goes off to the side, and adds as > little height as possible. > does anyone have any thoughts about this ? I need to use something that has > an air filter, etc. Old Jeeps, maybe some other 1940's or early 50's vintage vehicles had that type of stuff. Back in the days when the valves were in the block. Maybe get creative with a K&N type and some ductwork. The really serious swappers spend many hours walking through wrecking yards looking for the right parts. Shannen > thanks a lot, and thanks a lot for all of the excellent prior help. I would > not of got his far without it. > > Ted Stowe ------------------------------ From: Orin Eman Date: Sun, 27 Sep 1998 23:46:22 -0700 (PDT) Subject: Re: D-jet, 68HC11 disassembler > >Go look on > > > >http://www.datarescue.com > Hey, Orin, you know me, I'm cheep :-) Oh, I wasn't really telling you to go look, just the list in general ;) > Anyway, with my disassembler I can customise it if I want to... I actually have source to a HD6303 disassembler to which I have done some customising. IDA blows it away though - it's IDA's ability to name variables etc. on the fly that I like. With my other disassembler, I need to change a definition file, then run it for every change I make. I actually changed the old disassembler to output an input file for IDA from it's definition file! I actually wrote an assembler/disassembler for the SC/MP as a college project - around 1980 I believe... Orin. ------------------------------ From: wrm@xxx.za (Wouter de Waal) Date: Mon, 28 Sep 1998 08:36:40 +0200 Subject: Re: diy_disassembler Hi Ludis & all >simple disassembler for an 8 bit CPU is easy to write. Yup, I used the table method for the HC11. Four tables, the base one and 3 extended ones (The third one only has 4 instructions, I dunno why they didn't put all the extended instructions in one page. Must have been easier to code the logic this way) Now, the 68000 disassembler I wrote, that was much more fun. Too many instructions and modes for a table, so you have to look at the way the instructions are encoded. (Quite consequently for the 68K). I used a table of OR and AND values to get to the instruction (MOVE, JUMP or whatever) and then coded the stuff to extract the source, destination, mode, whatnot. There's probably a better/easier way. >The disassemblies on my web pages were produced with this "sed" method. You're a braver man than I am :-) The code that I'm looking at disassembles nicely, the data and the code are separated. Sometimes they mix code and data and that doesn't disassemble well. Then you need a disassembler that follows the execution thread, and walks around data areas. Now, what I need are the hardware specs for the 808 box. In other words, where in memory do they map the input and output ports. Ludis, I know you know, but I can understand that you might not want to tell us... but if you would, please? ------------------------------ From: "Ross Myers" Date: Mon, 28 Sep 1998 18:25:17 +1000 Subject: What is this chip 68HC25? I know the HC24 is a port expansion unit, but what is a HC25?. I've check the Motorola web site but no luck. Bye Ross Myers ------------------------------ End of DIY_EFI Digest V3 #444 ***************************** 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".