DIY_EFI Digest Tuesday, 7 May 1996 Volume 01 : Number 132 In this issue: Bosch ECU Schematic for 1981 BMW 528i 67f687 Re: Variable cam timing Re: Bosch ECU Schematic for 1981 BMW 528i Re: L-jetronic info Re: 67f687 re: Re: Variable cam timing Re: Variable cam timing Re[3]: Variable cam timing Re: L-jetronic info Reply to: Re[3]: Variable cam timing 8748 add'l injector controller design Re: 8748 add'l injector controller design RE: 8748 add'l injector controller design See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- From: glide@xxx.net (Michael Glidewell) Date: Mon, 6 May 1996 07:11:01 -0400 Subject: Bosch ECU Schematic for 1981 BMW 528i Anyone know where I can get a schematic for the Bosch ECU for 1981 BMW 528i. Its an L-jetronic. Anyone know of any mods to this that could improve it? - -------------------------------------------------- Michael Glidewell, Ann & Alesia Boston, MA 528i KE1CP glide@xxx.net - -------------------------------------------------- ------------------------------ From: Jeffrey.Giberstein@xxx.EDU (Jeffrey Giberstein) Date: 06 May 96 07:26:50 EDT Subject: 67f687 Apologies if you've received this twice. To those of you who are familiar with it, does anyone have an extra SSI 67f687 engine management chip? We've blown a couple and SSI is on backorder. Will pay cash. Thanks, Jeff Giberstein Dartmouth Formula Racing ------------------------------ From: ehernan3@xxx.com (Edward Hernandez (R)) Date: Mon, 6 May 1996 09:38:55 +0500 Subject: Re: Variable cam timing - ----- Begin Included Message ----- "what about a synchro-type system where the amount of slip between the driving motor (driven from the crank) and the drivenmotor (connected to the timing chain / cam gear itself) can be varied, giving a variable cam timing technique? it could be extended into having different timing for intake & exhaust, for dohc engines. The motors I thought of using would be some sort of induction motor, to eliminate the use of brushes." Ooh, you're so close.........hint: you don't need the motor;) ------------------------------ From: WERNER_HAUSSMANN@xxx.com Date: Mon, 6 May 96 08:50:18 -0600 Subject: Re: Bosch ECU Schematic for 1981 BMW 528i Michael, This is from Joeri de Haas Take a look at http://proffa.cc.tut.fi/~k124775/ which is the homepage of a Finish Alfa Romeo nut. He has done his part of research on the early L-jetronic. Werner ______________________________ Reply Separator _________________________________ Subject: Bosch ECU Schematic for 1981 BMW 528i Author: Non-HP-owner-diy-efi (owner-diy_efi@xxx.edu) at HP-ColSprings,mimegw2 Date: 5/6/96 6:11 AM Anyone know where I can get a schematic for the Bosch ECU for 1981 BMW 528i. Its an L-jetronic. Anyone know of any mods to this that could improve it? - -------------------------------------------------- Michael Glidewell, Ann & Alesia Boston, MA 528i KE1CP glide@xxx.net - -------------------------------------------------- ------------------------------ From: WERNER_HAUSSMANN@xxx.com Date: Mon, 6 May 96 08:46:08 -0600 Subject: Re: L-jetronic info There is a converter available that will make the Air Mass meter look like an Air flap meter. I can't remember where I saw that, but I'll try to find out. Werner ______________________________ Reply Separator _________________________________ Subject: Re: L-jetronic info I currently have a 85 SVO Mustang, which is modified a great deal, the problem I am now facing is the air volume meter, which is a Bosch unit. Has anyone ever converted one of these engines to run a mass airmeter which would increase the air flow to the engine. Other people have done it in the past, but does anyone have any ideas or inforamtion. >Troy ------------------------------ From: Sandy Date: Mon, 06 May 1996 09:13:46 -0700 Subject: Re: 67f687 I sent the samples that I had out, but I can't remember to whom. Maybe John G? Sandy At 12:19 AM 5/6/96 EDT, you wrote: >To those of you who are familiar with it, does anyone have an extra SSI 67f687 >engine management chip? We've blown a couple and SSI is supposedly on >backorder -- have to race Formula SAE in one week. Please help, will pay cash. > >Thanks, > >Jeff Giberstein >Dartmouth Formula Racing > ------------------------------ From: SRavet@xxx.com Date: Mon, 6 May 96 12:41:14 CDT Subject: re: Re: Variable cam timing ehernan3@xxx.com (Edward Hernandez (R)) Wrote: | | | ----- Begin Included Message ----- | "what about a synchro-type system where the amount of slip between the | driving motor (driven from the crank) and the drivenmotor (connected to the | timing chain / cam gear itself) can be varied, giving a variable cam timing | technique? it could be extended into having different timing for intake & | exhaust, for dohc engines. The motors I thought of using would be some sort | of induction motor, to eliminate the use of brushes." | | Ooh, you're so close.........hint: you don't need the motor;) | Come on Ed, don't tease us like that. I remember a mechanical type described in Motor Trend a while back. The chain end of the camshaft was threaded, and the sprocket screwed onto the thread. There was an oil driven piston that pressed against the sprocket. As the piston moved the sprocket back and forth, it caused the camshaft to be advanced or retarded via the threads. It was a very coarse thread. - --steve Steve Ravet sravet@xxx.com Baby you're a genius when it comes to cooking up some chili sauce... ------------------------------ From: Darrell Norquay Date: Mon, 6 May 96 12:25:39 MDT Subject: Re: Variable cam timing > technique? it could be extended into having different timing for intake & > exhaust, for dohc engines. The motors I thought of using would be some sort > of induction motor, to eliminate the use of brushes." > > Ooh, you're so close.........hint: you don't need the motor;) > Ed: Sounds like you guys are cookin sumpin' up over there at Ford... regards dn - -- - ----------------------------------------------------------------- Darrell A. Norquay Internet: dn@xxx.ca Datalog Technology Inc. Voice: (403) 243-2220 Calgary, Alberta, Canada Fax: (403) 243-2872 "Absolutum Obsoletum" - If it works, it's obsolete - ----------------------------------------------------------------- ------------------------------ From: jfaubion@xxx.mil (jfaubion) Date: Mon, 06 May 96 17:10:43 cdt Subject: Re[3]: Variable cam timing >ehernan3@xxx.com (Edward Hernandez (R)) Wrote: | >I remember a mechanical type described in Motor Trend a while back. The >chain end of the camshaft was threaded, and the sprocket screwed onto the >thread. There was an oil driven piston that pressed against the sprocket. >As the piston moved the sprocket back and forth, it caused the camshaft to >be advanced or retarded via the threads. It was a very coarse thread. This would change only the timing, not the shape of the lobe. Controlling the lift and duration of the valve would change the performance much more dramatically. Why not use a solenoid valve to bleed off pressure from hydraulic lifters? The cam could be ground much more radical and the computer could easily bleed off the difference. My real preference would be solenoid actuation of the valves but I believe that to be a few years away. Does anyone know of any projects doing this? John Faubion jfaubion@xxx.mil ------------------------------ From: "James V. Pearl/QSI" Date: 6 May 96 18:22:36 EDT Subject: Re: L-jetronic info This has already been done and has been spoken about recently on the FORDnatics list. Speak to Mike Wesley - mwesley @xxx. He developed the kit and it's currently being sold.. jvp@xxx.com You said: I currently have a 85 SVO Mustang, which is modified a great deal, the problem I am now facing is the air volume meter, which is a Bosch unit. Has anyone ever converted one of these engines to run a mass airmeter which would increase the air flow to the engine. Other people have done it in the past, but does anyone have any ideas or inforamtion. >Troy At 09:58 AM 5/3/96 +0200, you wrote: >Werner, > >I am not sure if you have got an early or a late L-jetronic, but take a look >at http://proffa.cc.tut.fi/~k124775/ which is the hompage of a Finish Alfa >Romeo nut. He has done his part of research on the early L-jetronic. > ------------------------------ From: RABBITT_Andrew@xxx.au Date: Tue, 7 May 1996 08:54:48 est Subject: Reply to: Re[3]: Variable cam timing infinitely variable cam phasing and duration has already been acheived by Austin-Rover in the UK on their K-series 1.8L engine fitted to the new MGF. This uses a mechanism which controls the speed fluctuation of the cam such that the speed of the cam during which the valve is lifted determines the cam duration and likewise when the valve is seated the cam phasing can be controlled. A hydraulic bleed system would have a significant BSFC penalty and I'd be interested in how an electrical synchronous drive could guarantee the correct cam phasing, especially during start-up Andrew Rabbitt oecar1@xxx.au From: jfaubion@xxx.mil:smtp Date: ## 05/06/96 17:10 ## >ehernan3@xxx.com (Edward Hernandez (R)) Wrote: | >I remember a mechanical type described in Motor Trend a while back. The >chain end of the camshaft was threaded, and the sprocket screwed onto the >thread. There was an oil driven piston that pressed against the sprocket. >As the piston moved the sprocket back and forth, it caused the camshaft to >be advanced or retarded via the threads. It was a very coarse thread. This would change only the timing, not the shape of the lobe. Controlling the lift and duration of the valve would change the performance much more dramatically. Why not use a solenoid valve to bleed off pressure from hydraulic lifters? The cam could be ground much more radical and the computer could easily bleed ------------------------------ From: cmorris@xxx.com (Charles) Date: Mon, 6 May 1996 19:53:47 -0700 Subject: 8748 add'l injector controller design I have completed the breadboard of my 8748 controller which drives two 60 lb/hr injectors (using MC3484 peak/hold drivers). It works great in my BMW 745i (factory intercooled turbo, 7-8 psi). I am now running 16-17 psi boost with no detonation - in fact, I think my fuel map is a little too rich! (no oxygen sensor). I have laid out the artwork for a two-sided PC board using Eagle 2.6, but have not had it fabricated yet (the first two boards are the expensive ones - about $250-300 ;) It's not a very flexible design (map is stored in EPROM), but it _is_ simple, with a low component count, and the software is only about 100 bytes long (plus the 256 byte map). The only expensive item (other than the PC board ;) is the 0-30 psig pressure sensor with 0.5-4.5 volt output - cost me $43 from OMEGA. Anyway, if anyone's interested I can post a ZIP file with the schematic and the artwork (printable on a HP laser printer). It's only about 60Kb compressed. Usual disclaimers about blowing up CPU's and engines at your own risk, etc. Next revision is to add a multiplexer to the A/D input (from the pressure sensor) so that an oxygen sensor may be used for closed-loop control. - -Charles ------------------------------ From: thoffman@xxx.net (Tim Hoffman) Date: Tue, 07 May 1996 05:45:21 GMT Subject: Re: 8748 add'l injector controller design On Mon, 6 May 1996 19:53:47 -0700, you wrote: > Anyway, if anyone's interested I can post a ZIP file with the >schematic and the artwork (printable on a HP laser printer). It's only >about 60Kb compressed. Usual disclaimers about blowing up CPU's >and engines at your own risk, etc. > Next revision is to add a multiplexer to the A/D input (from the >pressure sensor) so that an oxygen sensor may be used for closed-loop >control. >-Charles > > I'm interested! How difficult would it be to extend your current design to 4 injectors? Tim Please Note New Address: thoffman@xxx.net ------------------------------ From: Krister Wikstrom Date: Tue, 7 May 1996 11:42:10 +0200 Subject: RE: 8748 add'l injector controller design - ------ =_NextPart_000_01BB3C0A.3AAB6070 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit - ---------- From: Charles Subject: 8748 add'l injector controller design > Anyway, if anyone's interested I can post a ZIP file with the >schematic and the artwork (printable on a HP laser printer). It's only I'm very interested, possible to get the source code also? Krister Wikstrom kwi@xxx.fi - ------ =_NextPart_000_01BB3C0A.3AAB6070 Content-Type: application/ms-tnef Content-Transfer-Encoding: base64 eJ8+IgsJAQaQCAAEAAAAAAABAAEAAQeQBgAIAAAA5AQAAAAAAADoAAEIgAcAGAAAAElQTS5NaWNy b3NvZnQgTWFpbC5Ob3RlADEIAQ2ABAACAAAAAgACAAEEkAYAZAEAAAEAAAAMAAAAAwAAMAIAAAAL AA8OAAAAAAIB/w8BAAAAYwAAAAAAAACBKx+kvqMQGZ1uAN0BD1QCAAAAAGRpeV9lZmlAY291bG9t Yi5lbmcub2hpby1zdGF0ZS5lZHUAU01UUABkaXlfZWZpQGNvdWxvbWIuZW5nLm9oaW8tc3RhdGUu ZWR1AAAeAAIwAQAAAAUAAABTTVRQAAAAAB4AAzABAAAAIwAAAGRpeV9lZmlAY291bG9tYi5lbmcu b2hpby1zdGF0ZS5lZHUAAAMAFQwBAAAAAwD+DwYAAAAeAAEwAQAAACUAAAAnZGl5X2VmaUBjb3Vs b21iLmVuZy5vaGlvLXN0YXRlLmVkdScAAAAAAgELMAEAAAAoAAAAU01UUDpESVlfRUZJQENPVUxP TUIuRU5HLk9ISU8tU1RBVEUuRURVAAMAADkAAAAACwBAOgEAAAACAfYPAQAAAAQAAAAAAAAC2k0B BIABACoAAABSRTogODc0OCBhZGQnbCBpbmplY3RvciBjb250cm9sbGVyIGRlc2lnbgAkDgEFgAMA DgAAAMwHBQAHAAsAKgAKAAIAIAEBIIADAA4AAADMBwUABwALACcAHQACADABAQmAAQAhAAAANDI2 QjMzNDREN0E3Q0YxMUExMEQwMDAwNEIzMjNGQ0YADQcBA5AGAJADAAAUAAAACwAjAAAAAAADACYA AAAAAAsAKQAAAAAAAwAuAAAAAAADADYAAAAAAEAAOQDQokx2+Tu7AR4AcAABAAAAKgAAAFJFOiA4 NzQ4IGFkZCdsIGluamVjdG9yIGNvbnRyb2xsZXIgZGVzaWduAAAAAgFxAAEAAAAWAAAAAbs7+XY6 RDNrSafXEc+hDQAASzI/zwAAHgAeDAEAAAAFAAAAU01UUAAAAAAeAB8MAQAAABEAAABrd2lAbWFt bWEuaWNsLmZpAAAAAAMABhB8CeafAwAHEPUAAAAeAAgQAQAAAGUAAAAtLS0tLS0tLS0tRlJPTTpD SEFSTEVTU1VCSkVDVDo4NzQ4QURETElOSkVDVE9SQ09OVFJPTExFUkRFU0lHTkFOWVdBWSxJRkFO WU9ORVNJTlRFUkVTVEVESUNBTlBPU1RBWklQAAAAAAIBCRABAAAA8QEAAO0BAADHAwAATFpGdSjs ZC//AAoBDwIVAqQD5AXrAoMAUBMDVAIAY2gKwHNldO4yBgAGwwKDMgPGBxMCg7ozEw19CoAIzwnZ OxX/eDI1NQKACoENsQtgbuBnMTAzNQr7EvIMARpjAEAgCoUKi2xpMQQ4MALRaS0xNDTPDfAM0BzD C1kxNgqgA2D2dAWQBUAtHucKhx2bDDB1HmZGA2E6H+4eZgyCIDpDEcFsB5AfjyCdU3UcYmoeoSHP Its4NzTAOCBhZGQnAyALgN8mQgWxBaACMANgbCPgBcAzDbAAkGduGu8b8zM2vx1nFCIMAR5mJB0a OT4sTwMehDDCQW55d2F5OiwpAGYooDEgAiBlJy8EIAuAHpAWAHMekGQgZkkpkAORcG8ysCigILBa SVAgHJAj4CAD8Ph0aCA0gDRALb8uzyy+xwTwNMAAwHRpYzGxMuATNLIKwHR3BbBrICi/HmAyUQGg NDECIDOhSDPwnwtgEfAFwDnDBJApLjLw5nQyIQIgbHkrHywoGjQPG0w1fzDDMvAnbSB2/wSQPGAy WDFwM2EAkDoiKWCsIGcSADSjcwhhYzRA1wWgDbAooGxDYD8qvD6VHTDCSwUQMrEFwFdpa1cysANh RVlrA/BAAMBt5QDALjiAbC4ckD6VFSECAElgAAAAAwAQEAAAAAADABEQAAAAAEAABzDwdIMW+Tu7 AUAACDDwdIMW+Tu7AR4APQABAAAABQAAAFJFOiAAAAAAAwANNP03AACw8Q== - ------ =_NextPart_000_01BB3C0A.3AAB6070-- ------------------------------ End of DIY_EFI Digest V1 #132 ***************************** 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".