DIY_EFI Digest Thursday, February 24 2000 Volume 05 : Number 073 In this issue: Daewoo ECU wiring online Re: DIY-EFI%20References Re: Daewoo ECU wiring online EFI newbiee ideas, few questions. Re: EFI newbiee ideas, few questions. See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Wed, 23 Feb 2000 16:13:26 +0200 From: wrm@xxx.za (Wouter de Waal) Subject: Daewoo ECU wiring online Hi all I finally found the wiring diagram for the Daewoo Cielo 1500 4 cyl. Some of you might remember, I was asking questions about this thing some time ago. Someone said that it's a standard '808 ECU, someone else differed. I ripped the EPROM, it's in a blue carrier labelled labelled DELCO BWJT 0723, but the code inside is totally different from the '165 or '808 code I've seen. Tables are similar, 3 bytes before the table etc. I've compared the wiring diagram to 89-165v8MAF and V8wire, those two are similar but quite different from what I have. So, I still don't know what kind of a box this is. The engine is GM, BTW. I've put the pinouts at http://www.retro.co.za/daewoo-ecm-wiring.html for those of you that are interested. I'll probably scan it in when I get a chance too. Wouter - ---------------------------------------------------------------------------- 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: Thu, 24 Feb 2000 07:58:17 +0800 From: dzorde@xxx.com Subject: Re: DIY-EFI%20References Just a guess, but what about Automatic Exhaust Gas System (EGR system) ? On a different note, has anybody read anything about a new chip that has been developed by Daimler-Chrystler. They claim its a neural chip that optimises ignition firing based on combustion pressure ? Dan dzorde@xxx.com Date: Tue, 22 Feb 2000 19:45:04 EST From: JClark318i@xxx.com Subject: DIY-EFI%20References Hello what does the letter AEGS means, I have a 94 BMW 318is and I keep getting a code 1245 which talks about the intervention AEGS Thanks jclark318i@xxx.com - ---------------------------------------------------------------------------- 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: Wed, 23 Feb 2000 16:28:00 -0800 From: Ludis Langens Subject: Re: Daewoo ECU wiring online Wouter de Waal wrote: > > I ripped the EPROM, it's in a blue carrier labelled labelled > DELCO BWJT 0723, but the code inside is totally different > from the '165 or '808 code I've seen. By blue carrier, do you mean a brown or black bottom with a blue cover and the EPROM and two other small chips inside? Upload the binary to diy-efi/incoming, someone may recognize the code. - -- Ludis Langens ludis (at) cruzers (dot) com Mac, Fiero, & engine controller goodies: http://www.cruzers.com/~ludis/ - ---------------------------------------------------------------------------- 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: Wed, 23 Feb 2000 18:51:38 -0800 From: "Toby Atwater" Subject: EFI newbiee ideas, few questions. I just discovered this list a few days ago and I am reading everything I can. Fascinating stuff. Just got a few questions and "what ifs" First off my project is to "convert" a 1969 Austin Healey Sprite (1275 cc inline 4) to Throttle Port Injection. I would hopefully keep my carbs and just use them as throttle bodies and fabricate a piece that would fit between the carb body and the manifold with the injector. X2 for both carbs. I'm still in the research stage BTW. As I understand it, fuel injection lets you keep the fuel ratio to a perfect 14.7 mixture throughout the RPM band. The injectors know how much they are injecting therefore the only other variable is knowing how much air is going into the engine. As I understand it, there are 3 ways to do this. 1) A "mass air flow" sensor that somehow measures the amount (and pressure) of air coming into the engine and then in turn lets the ECU know and the ECU calculates how much fuel the injectors need to inject. 2) An o2 sensor down the exhaust pipe inorder to tell the ECU how much more, or less fuel in needs too inject on the next stroke to maintain the exhaust o2 levels low therefore indirectly keeping the ratio correct to a 14.7 3) A throttle position sensor that just tells the ECU to inject more (pedal to the metal) or less (idle) fuel into the system. This last choice seems to be the "dumbest" method of doing it. It also depends on some kind of variable in the ECU to know how much air is going into the engine for a certain throttle position. So my question is, as I understand it, modern cars have all 3? is this just to be redundant and to MAKE SURE the mix is correct? Couldn't I just get by with some sort of mass air flow sensor (#1). If I would ever supercharge in the future, or I took the car too a higher altitude, I wouldn't have to touch anything (just make sure the injectors are big enough to be able to inject that much more fuel for SuperCharging.) Thanks for your help. Let me know if my logic is no good either. Toby Atwater Santa Barbara, CA 1971 Toyota Land Cruiser 1969 Austin Healey Sprite. - ---------------------------------------------------------------------------- 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: Wed, 23 Feb 2000 22:10:56 -0500 From: "nacelp" Subject: Re: EFI newbiee ideas, few questions. > First off my project is to "convert" a 1969 Austin Healey Sprite (1275 cc > inline 4) to Throttle Port Injection. I would hopefully keep my carbs and > just use them as throttle bodies and fabricate a piece that would fit > between the carb body and the manifold with the injector. X2 for both carbs. > I'm still in the research stage BTW. Don't forget about the TPS, that can be time consuming to design to get it fail proof. Throttle Posistion Sensor. > As I understand it, fuel injection lets you keep the fuel ratio to a perfect > 14.7 mixture throughout the RPM band. Not all the time. Idle cruise, yes. But it averages 14.7, it goes rich and lean for the cat converter. WOT (wide open throottle) is richer. The injectors know how much they are > injecting therefore the only other variable is knowing how much air is going > into the engine. As I understand it, there are 3 ways to do this. > 1) A "mass air flow" sensor that somehow measures the amount (and pressure) > of air coming into the engine and then in turn lets the ECU know and the ECU > calculates how much fuel the injectors need to inject. Two basic common strategies, MAF Mass Air Flow, where the air volume inhaled is measured directly, and MAP Manifold Absolute Pressure, where the ecm calculates the amount of air the engine is using,, know rpm/intake vac (short descreption). Other less common ones available, but I'm assuming you want to use any existing oem ecm.. > 2) An o2 sensor down the exhaust pipe inorder to tell the ECU how much more, > or less fuel in needs too inject on the next stroke to maintain the exhaust > o2 levels low therefore indirectly keeping the ratio correct to a 14.7 Just for fine tuning really. > 3) A throttle position sensor that just tells the ECU to inject more (pedal > to the metal) or less (idle) fuel into the system. This last choice seems to > be the "dumbest" method of doing it. It also depends on some kind of > variable in the ECU to know how much air is going into the engine for a > certain throttle position. There is a strategy for just using TPS, and RPM. > So my question is, as I understand it, modern cars have all 3? To have a closed loop system (which is about mandatory), uses the O2 sensor, to meet todays emission standards you about have to have this. I think if you follow up with more reading about TBI, and TPI, some light will dawn (lots of ink to read here). is this just > to be redundant and to MAKE SURE the mix is correct? Couldn't I just get by > with some sort of mass air flow sensor (#1). That is what some systems use. If I would ever supercharge in > the future, or I took the car too a higher altitude, I wouldn't have to > touch anything (just make sure the injectors are big enough to be able to > inject that much more fuel for SuperCharging.) There is only a certain range you can work with. Sizing injectors, and S/C all take lots of prior research to get good results Grumpy > > Thanks for your help. Let me know if my logic is no good either. > > Toby Atwater > Santa Barbara, CA > 1971 Toyota Land Cruiser > 1969 Austin Healey Sprite. > > -------------------------------------------------------------------------- - -- > 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 > - ---------------------------------------------------------------------------- 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 #73 **************************** 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".