DIY_EFI Digest Sunday, September 19 1999 Volume 04 : Number 533 In this issue: Intake port bondo; was digest TPS fuel enrichment strategy. How implement rate of change Re: electric boost Re: DIY_EFI Digest V4 #530 chksum opel omega 2.0 16v Re: DIY_EFI Digest V4 #531 See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Sat, 18 Sep 1999 18:20:46 EDT From: ECMnut@xxx.com Subject: Intake port bondo; was digest Hi Chris, May be more expensive, but I've had great luck with Moroso "A&B Epoxy".. Summit has it for $20 something.. Comes in two big sticks about 8 inches long each. Mix equal parts and shape like clay. Use it in intake ports of heads as wel as in intakes. shapes easy.. Grinds easier.. Don't use it on exhaust side.. 8-) Could get ugly. MV > > I am thinking maybe J-B Weld, in case lots, or polyester resin. Any > and all suggestions and warnings would be appreciated! ------------------------------ Date: Sat, 18 Sep 1999 21:42:57 EDT From: PHXSYS@xxx.com Subject: TPS fuel enrichment strategy. How implement rate of change I have a project where I want to provide some additional fuel. I need some help with a TPS rate of change (ROC) function. How does GM EFI calculate the rate of change on the TPS? What is the TPS strategy for adding fuel? What conditions activate the TPS fuel enrichment? I have written some code reads the TPS in a timing loop. it accumulates the difference between increasing values, the result is a 0-255 value. Does anyone know what GM's TPS sample rate is for calculating ROC? My main concern is the timing of the whole procedure. If I detect rapid throttle advance, can I ...? 1. Add a percentange of fuel (calculation directly proportional rate of change value) 2. Engage a sustain period also based on TPS rate of change (ROC) value ...without re-sampling the TPS ROC value during the enrichment period. This means that the TPS would not be sampled again until the sustain period is finished. I am trying to keep it simple. Can you see any serious problems with this strategy? Thanks in advance ------------------------------ Date: Sun, 19 Sep 1999 01:12:36 +0000 From: "Alex C. Peper" Subject: Re: electric boost Use only for a few secs. during accell. then charge when cruising, regenerative braking. ultra capcitors and or thermoelectric. Alex > > We've all (or many of us) heard/read about the "electric superchargers" > that have been marketed recently, these are devices which connect to the > intake and blow in air - but they are electric powered. They typically > run for short bursts of time to provide just a little extra grunt when > needed, and usually on naturally aspirated engines, especially diesels. > > Well, has anyone thought of doing this *right*? Install additional > alternator capacity to support running the unit consistently. Put in an > intercooler, etc. to support higher boost levels, like a real turbo. > > Such a system has the following advantages: > > 1) More fuel efficient than a supercharger > > 2) Very little turbo lag > > 3) Very precise and simple control of boost (electronic control system can > directly vary impeller speed to control boost) > 3.5) Knock sensor system can now reduce boost as a way of preventing > detonation! Oh happy day. > > 4) No parasitic drag when not in operation; relatively little even under > boost > > 5) Can build boost on the line even with manual transmission, for drag > racing, or at low RPM, for road courses/autocross > > 6) Easy to install. No need to fuss with the exhaust. > > I can think of the following disadvantages: > > 1) Current electric superchargers may not have sufficient duty cycle > and/or airflow. > > 2) Alternator drag/battery drain may be more than I expect. > > 3) No kits available for this. Do it all yourself. Need an ECU that can > understand what's going on. > > 4) No one else is doing it, so there must be some obvious problem that I > haven't thought of. > > Alex C Peper http://www.obd-2.com ------------------------------ Date: Sun, 19 Sep 1999 07:31:27 +0100 From: "Rich Mauruschat" Subject: Re: DIY_EFI Digest V4 #530 >DIY_EFI Digest Friday, September 17 1999 Volume 04 : Number 530 >Date: Fri, 17 Sep 1999 13:41:52 +0200 >From: Nic van der Walt >Subject: Newbie questions #438-443 > >Jo > >I'm designing the parts I'll have manufactured for my bike's >EFI manifold and have been wondering about a couple of things. >Is there a standard form factor for injectors that I can base >the design on? Can I for example design for a Bosch injector >and then be able to swap injectors around until I get a type >that works well? Anyone have any dimensioned drawing they are >willing to share? I have a scale drawing of the Bosch pattern (o-ring both ends) injector in Autocad .dwg format which I produced whilst doing something similar to yourself. It isn't dimensioned, but I guess I could add some critical dimensions and output in a different format if neccessary. >What is a reasonable minimum on time for an injector? The injector >will have to flow around 3.5l/h at WOT. How do I go about actually >buying something? Any brand to look out for? What is a good fuel >pressure to work at? If you haven't already, have a look at http://www.vectorbd.com/peugeot/bosch.html There is a whole heap of useful links there relating to Bosch stuff, including lists of injector data (includes other types, Lucas, Nippon etc). >The bike currently has four carbs. I have been considering using the carbs >as is, closing of all the ports and mounting the injector basically opposite >of where the main jet used to be. This makes the mechanical side of things >very >simple and cheap, but places the injector at a right angle to the air flow. >Will this affect anything? I think it's generally considered a bad thing to inject across the airflow path like this, there is a tendency to chuck fuel at the port walls which then condenses; this is much worse an effect at low speeds obviously. The Group B Rover Metro 6R4 (V6 quad cam, lots of rpm) used just this arrangement, that obviously worked OK, produced good power. They were not concerned about low speed behaviour or fuel consumption or emmissions. The carbies don't suffer the same problem of course, as the airflow draws fuel off the main jet in the direction of flow. >Thanks >Nic. hope this helps, let me know on the injector drawing. Rich M ------------------------------ Date: Sat, 18 Sep 1999 15:04:14 +0200 From: "TT" Subject: chksum opel omega 2.0 16v This is a multi-part message in MIME format. - ------=_NextPart_000_0064_01BF01E7.11F7F840 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable please request information of eprom of opel omega 2000 16v 5wk9071 with = chksum c3e8 of siemens regard chksum and table of ignition and injection many thanks giuseppe italy - ------=_NextPart_000_0064_01BF01E7.11F7F840 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
please request information of eprom of = opel omega=20 2000 16v 5wk9071 with chksum c3e8 of siemens regard chksum and table of = ignition=20 and injection
many thanks giuseppe=20 italy
- ------=_NextPart_000_0064_01BF01E7.11F7F840-- ------------------------------ Date: Sun, 19 Sep 1999 01:12:36 -0700 (PDT) From: Tristan Dresch Subject: Re: DIY_EFI Digest V4 #531 Hello folks, I'm new to this list and before I waste anyone's time, is there any recomended books I could purchase that would educate me about EFI systems. I have read the books in the local book stores but they are not technical enough. I was looking for very technical data on EFI. I have a XR4ti which uses a '89 Ford EEC-IV which will be my focus. Also, I desire to run the same system on a '70 Spitfire and would like to learn all the information that will allow me to fine tune these systems. Thank you for your time, Cris ------------------------------ End of DIY_EFI Digest V4 #533 ***************************** 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".