DIY_EFI Digest Sunday, March 5 2000 Volume 05 : Number 084 In this issue: Rheostat for flow bench weber-marelli ecu in an Alltrac Flow rates on injectors 2.8 & 3.1 engines Data-logging Knock sensor interface See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Sat, 4 Mar 2000 16:34:12 -0700 From: "Andrew Hunter" Subject: Rheostat for flow bench The injector flow bench article on the website shows the wiring diagram and says to use the following: 100ohm, 20w rheostats for the injector controls 20ohm, 20w rheostat for the fuel pump The parts list says something different. 100ohm, 12.5w rheostats for the injector controls 20ohm, 25w rheostats for the fuel pump. Can someone tell me which ones are correct? Thanks, Andrew - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Sun, 5 Mar 2000 11:42:33 +0800 From: Adrian Broughton Subject: weber-marelli ecu in an Alltrac Hi Max, > I want to put a weber-marelli ecu (from a Lancia Integrale) in my Toyota > Celica Alltrac. woohooo.. a fellow Alltrac owner. What model? I have a 1990 ST185 Alltrac (well, they are called GT-Four's here in Australia). > The problem is that the sensors for the phase are different. > Has anyone tried to disassemble the eprom from the weber-marelli ecu? > I have, obviously, the pointers to the ignition/iniection/boost map, but > modify the code is not so simple.... Are you a member of the GT4 mailing list? I would *strongly* recommend any Alltrac/GT-Four owner to become a member of this list, it has been by far the best resource for my GT-Four, and the guys (and girls) on the list are extremely helpful. Check out: http://www.onelist.com/group/gt4 You should be able to search and browse through the message archives there as well. Its a pretty busy list, sometimes up to 100 posts a day. There are numerous people on there running non-standard ECU's, although most of them are of the "normal" aftermarket variety (ie G-Force, Wolf3D, Motec, Autronic, etc). Some of the guys are running around the 500hp mark in these cars which is pretty good for a 2.0 4-cyl Turbo. I would be interested to know how you go with the Lancia ECU.. I have no experience with these at all so I can't really help you, although I am in the process of designing a "piggyback" system to the stock ECU to allow data-logging, FCD, AFC, and water injection control, turbo-timer, remapping sensors, etc.. etc.. Details of this project will be up on my website in the next couple of days. I am very interested in this kind of stuff for these cars, but as I'm sure you know it is hard to find people who know much about them. Good luck with the project, and I might talk to you on the GT4 list as well. Cheers, Adrian ___________________________________ Adrian Broughton 1990 Celica GT-Four, 1974 VW Kombi, 1967 Holden HR Fremantle, Western Australia gtfour@xxx.au/~gtfour/ ___________________________________ - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Sun, 5 Mar 2000 02:23:54 -0600 From: "Dan Plaskett" Subject: Flow rates on injectors 2.8 & 3.1 engines Does anyone know the flow rates for the injectors used on the 2.8 and 3.1 liter GM engines? Thanks. Dan Plaskett - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Sun, 5 Mar 100 17:02:01 +0800 (WST) From: Bernd Felsche Subject: Data-logging Adrian Broughton writes: >I would be interested to know how you go with the Lancia ECU.. I have no >experience with these at all so I can't really help you, although I am in >the process of designing a "piggyback" system to the stock ECU to allow >data-logging, FCD, AFC, and water injection control, turbo-timer, remapping That's what I'm in the process of doing as well (on a different scale) - - it's not yet on the white-board. If I can find the right connectors, it'll plug between the current ECU (VW Digifant II) and the engine harness, with a few other bits going off to cooling fan thermoswitches, road-speed sensor and airconditioner pressure switches as well. You can never have too much data! Planning on using an Atmel AT90S/L8535 for the data acquisition and then piping out the data using the SPI - either to a FLASH or another processor. Problem is; about 40 bytes of data per frame and one frame per 180 degrees of crank. The number of clock cycles available at 6000 rpm is rather small (I need at least 1280 SPI clocks to do the 24-bit address / 8-bit data transfer directly) and the data storage required for a reasonable operating cycle of 10 minutes is estimated to fill 2MB. OTOH, I also want a limited amount of display happening so a companion processor, which simply receives the frames for display/logging might be an advantage, also serving as a "control head" in the cockpit to trigger logging and maybe to adjust logging parameters (specifically scaling) on the fly. The companion processor could do some "compaction" as a significant amount of data doesn't change significantly for every frame (e.g. coolant and air temperatures). It would also serve as a convenient point from where I could download the logged data via a serial link - perhaps "replay" in the control head, or even flash a new program into the data acquisition processor. >sensors, etc.. etc.. Details of this project will be up on my website in >the next couple of days. Don't be afraid to let us know when it's ready. >Good luck with the project, and I might talk to you on the GT4 list as >well. >Adrian Broughton >1990 Celica GT-Four, 1974 VW Kombi, 1967 Holden HR >Fremantle, Western Australia Just up the road from me. - -- Real Name: Bernd Felsche Email: bernie@xxx.au http://www.perth.dialix.com.au/~bernie - Private HP - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Sun, 5 Mar 100 17:53:32 +0800 (WST) From: Bernd Felsche Subject: Knock sensor interface As part of the data-acquisition system I'm designing, I need to interface to the knock sensor. Having browsed the diy_efi web site and found the Intersil HIP9010, I downloaded and read the data sheet and AN9770 application note. Comparatively-speaking; I'm none the wiser. :-( How do I determine the significant background and knock sensor frequency bandwidths? Should I just "suck it and see" based on "guesstimates"? Any pointers to relevant resources would be welcome. - -- Real Name: Bernd Felsche Email: nospam.bernie@xxx.au http://www.perth.dialix.com.au/~bernie - Private HP - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ End of DIY_EFI Digest V5 #84 **************************** 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".