DIY_EFI Digest Sunday, 12 May 1996 Volume 01 : Number 137 In this issue: Re: additional injector See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- From: talltom Date: Sun, 12 May 1996 00:45:03 -0700 (PDT) Subject: Re: additional injector > >From: michael glidewell >Date: Thu, 09 May 1996 09:29:50 -0400 >Subject: Re: 8748 add'l injector controller design > >At 07:53 PM 5/6/96 -0700, you wrote: >> >> 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 Well we happen to have a 81 M745 laying around here too, and it does have a o2 sensor. Anyhow I'd be interested in seeing anything showing exactly what you've done. ------------------------------ End of DIY_EFI Digest V1 #137 ***************************** 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".