DIY_EFI Digest Thursday, 24 October 1996 Volume 01 : Number 323 In this issue: We're clever people Re: 5 terminal HEI module Re: We're clever people Re: pop quiz Bosch O2 Sensor See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- From: brewer@xxx.com (John Brewer) Date: Wed, 23 Oct 1996 07:53:57 -0500 Subject: We're clever people Daniel, you write >As I say, we're clever people. We can build act-alikes that fool >inspectors. (And perhaps it will be illegal, I don't care) Not a very "clever" thing to say on an open line in this day-and-age. "Any man who would trade liberty for security deserves neither." - Ben Franklin ------------------------------ From: Mark Eidson Date: Wed, 23 Oct 1996 08:46:14 -0700 Subject: Re: 5 terminal HEI module Has anybody tried to use the teeth on the flywheel or flexplate as a timing source? me At 08:35 AM 10/23/96, you wrote: > > Thanks John, > > With the 5-pin module essentially breaking the pick-up to coil driver > connection, this would be ideal for replacing the esc module with an > aftermarket ecu for the timing. Just need to modify the pick-up wheel > I think (need to examine the ecu instruction manual to see what is > suggested). > > Do you know how processed the pick-up signal is when it goes to the > esc module ? and do you know what signal the esc module uses to drive > the coil driver in the ignition module ? > > I'd hate to start to try and fit a big tooth wheel and pick-up as well > as coil driver to connect the ignition side of my ecu, if I can simply > use a 5-pin module (and maybe some filtering) to do the job. > > Dan dzorde@xxx.au > > >______________________________ Reply Separator _________________________________ >Subject: 5 terminal HEI module >Author: diy_efi@xxx.edu at INTERNET >Date: 10/21/96 9:25 PM > > >dzorde asks about the function of the 5 terminal HEI module. This was an >early control system for knock control only. The distributor (dizzy?) still >had centrifugal weights and a vacuum advance. The positive line of the two >wire pickup coil is sent to an ESC controller, instead of going right to the >HEI module as in the 4 terminal variety. If the ESC controller is not >detecting any knock input it simply allows the pickup coil signal to return >to the module and fire the coil. If it does detect knock, it DELAYS the >return of the pickup coil signal for a time equal to the numbers of degrees >of retard it commands, based on a lookup table in the ESC controller. The 5th >terminal is simply used as the line to return the pickup coil signal on. It >was an early, rather crude method of knock retard, but was perceived as a >great accomplishment at the time. I make this assumption based on the size of >the "ESC" emblem they used to put on the tailgate of trucks equipped with >this system. When I am doing a repair on these systems, most customers allow >me to just loop the positive pickup coil wire back into the module and throw >the ESC controller away! > > John Spears >Speartech Fuel Injection Systems > > > *************************************************************************** * Mark Eidson Voice: (602)752-6513 * * Staff Design Engineer Fax: (602)752-6000 * * Manager System Integration and * * Verification E-Mail: mark.eidson@xxx.com * * VLSI Technology, Inc. * * 8375 South River Parkway * * M/S 265 * * Tempe, Arizona 85284 * *************************************************************************** ------------------------------ From: Daniel Ridge Date: Wed, 23 Oct 1996 12:10:56 -0400 (EDT) Subject: Re: We're clever people John, On Wed, 23 Oct 1996, John Brewer wrote: > >inspectors. (And perhaps it will be illegal, I don't care) > Not a very "clever" thing to say on an open line in this day-and-age. I can personally assure you that I can write whatever I wish here and the people who check my emissions still won't know me from a hole in the wall. I seriously doubt that the powers that be have the free time to be reading, the drive space to be storing, or the spare cycles to be later sifting through my email. It's like license plates. Despite the fact that we have to put them prominently on our cars, we can still drive around and expect to remain reasonably anonymous -- because there are so many of us. I have license plates on all of my cars, and I don't feel like my privacy is being invaded by The Man. - -Dan ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\___/~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Daniel Ridge | USRA CESDIS Research Minion, Beowulf Project | Code 930.5 email: newt@xxx. W274 tel: 301-286-3062 | Goddard Space Flight Center fax: 301-286-1777 | Greenbelt, MD. 20771 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\_|_/~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ http://cesdis.gsfc.nasa.gov/people/newt ------------------------------ From: "George M. Dailey" Date: Wed, 23 Oct 1996 20:20:56 -0500 (CDT) Subject: Re: pop quiz At 08:12 PM 10/22/96 MST, you wrote: >For 10 points; > >I have a GM 350 suburban with a bad cylinder. I also have a spare 305 engine. >How much trouble will it be to run the 305 while I rebuild the 350? THe burb >is a 1989 TBI with a map sensor. > >Dan Furgason > This should be as easy as it gets. Vance mentioned about the center manifold bolt holes so I won't go there. I'm not sure that there is a difference between 350 & 305 TBI injectors. If it is, it's minimal. This will probally be ECM 1227747. As far as the electronics go, I THINK the ECM is smart enough to compensate for the cubic inch displacement difference in closed loop. A simple EPROM swap would guarantee trouble free operation (~$50.00 dealer). If you don't want to wrestle with the manifold problem, simply make an adapter for the exiesting 305 manifold. I did, and it worked great for me. Remember the exhaust manifold o2 sensor. All manifolds were not cast equally. Some won't have the fitting others will have one head bolt that won't line up. All in all this type of swap is as simple as it gets. If you use the exiesting 350 prom, let us know how it worked out. GMD ------------------------------ From: Doug Robson Date: Thu, 24 Oct 1996 13:47:43 +1000 Subject: Bosch O2 Sensor Message-ID: <32530062.7298@xxx.au> Date: Thu, 03 Oct 1996 09:53:06 +1000 From: Doug Robson Reply-To: doug@xxx.au X-Mailer: Mozilla 3.0Gold (Win95; I) MIME-Version: 1.0 To: diy_efi@xxx.edu Subject: Bosch O2 Sensor Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit - -- HI all who knows wether the WideBand ( .6 to 1.2 i think ) 4 wire Heatd O2 Bosch sensor is used by all people including MOtec and wetther The Autronic specified one ( which they dont tell me who makes it ) are the same . The Only variable i see can be the return voltage?? |===============================================================| | When I die, | | I want to go in my sleep, like my grandfather, | | not screaming like the passengers in his car. | |---------------------------------------------------------------| | Doug Robson (H) mailto:doug@xxx.au | | (W) mailto:Doug.Robson@xxx.com | | Sydney, Australia http://www.cia.com.au/doug | |---------------------------------------------------------------| | Club Car Racing Register of NSW | Thank God | | 1992/93 Under 2 litre State Champion | for | | http://www.cia.com.au/doug/ccrrnsw.html | Gravity | |===============================================================| ------------------------------ End of DIY_EFI Digest V1 #323 ***************************** To subscribe to DIY_EFI-Digest, send the command: subscribe diy_efi-digest in the body of a message to "Majordomo@xxx. 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