DIY_EFI Digest Friday, October 8 1999 Volume 04 : Number 568 In this issue: Re: DIY_EFI Digest V4 #567 Re: DIY_EFI Digest V4 #567 RE: How completcated does Efi HAVE to be? Not that complicated! Re: DIY_EFI Digest V4 #567 Re: HTML posts See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Fri, 08 Oct 1999 06:56:55 -0400 From: Frederic Breitwieser Subject: Re: DIY_EFI Digest V4 #567 > Surely it doesn't have to be *that* accurate? Why not use the coil? 2 per > Rev should be enough, you only need speed not accurate position? If you live in 70 degree weather year round, you can get away with crank/cam position and Throttle position only, and use a simple trigger to fire injectors and/or DIS systems. A group of us fooled around with a 555 timer on a mailing list called "simpleefi", and some of the folks started to build it. Not sure what is up. This of course doesn't compensate for barometric or temperature changes. Shove a 0-5V MAF in the system and you will get some of this control. The problem with all this "simple" stuff is that there are so many things that will affect your engine's performance, two sensors and a MAF isn't going to cut it if you want mileage and performance and acceleration all year round. I agree that its not specifically necessary to have 32-bit digital electronics to achieve this, however with the technology getting smaller, faster and more reliable every day, its certainly becoming easier to use. - -- Frederic Breitwieser Xephic Technology 769 Sylvan Ave #9 Bridgeport CT 06606 Tele: (203) 372-2707 Fax: (603) 372-1147 Web: http://xephic.dynip.com/ ------------------------------ Date: 09 Oct 99 00:04:15 +1200 From: "Tom Parker" Subject: Re: DIY_EFI Digest V4 #567 DIY_EFI Digest wrote: >Date: Sun, 07 Nov 1999 19:40:45 +0100 >From: Ade + Lamb Chop >Subject: RE: How completcated does Efi HAVE to be? >At 05:00 06/10/99 -0400, you wrote: >> >>I vaguely think that you only need a throttle position sensor and a map >sensor >>to do a reasonable job of EFI. However, you WILL need the crankshaft >>position sensor, which means you need the flywheel, transfer case and the >>actual sensor. >Surely it doesn't have to be *that* accurate? Why not use the coil? 2 per >Rev should be enough, you only need speed not accurate position? If you want to do ignition from the computer, then you need to know rather accuratly. If you are going to leave the distributor, then yes, using the coil would work. Now, are you guys on the digest, or is it just me. I remember a few months ago the server got constapated and we were all switched onto the digest. I had to resign for a while, and now I'm back, but on the digest still, is everyone digesting? - -- Tom Parker - parkert@xxx.nz - http://www.geocities.com/MotorCity/Track/8381/ ------------------------------ Date: Fri, 08 Oct 1999 09:40:33 -0700 From: Will McGonegal Subject: RE: How completcated does Efi HAVE to be? Not that complicated! >>to do a reasonable job of EFI. However, you WILL need the crankshaft position >>sensor, which means you need the flywheel, transfer case and the actual >>sensor. >Surely it doesn't have to be *that* accurate? Why not use the coil? 2 per >Rev should be enough, you only need speed not accurate position? >Ade I'd agree, you DON'T need the crankshaft position sensor (flywheel, transfer case and the actual sensor). An input from the spark ignition will sufice (distributor? surely that's already on the engine). That's all you need to get speed. You can use timers to delay injector firings after the spark triger, if you MUST get complicated. How can I get one of those cheapy Mini injection systems in Canada?! Will McGonegal Project Engineer/Dynamometer Developer Emissions Research and Measurment Division Environment Canada ------------------------------ Date: Fri, 8 Oct 1999 12:03:07 -0400 (EDT) From: William T Wilson Subject: Re: DIY_EFI Digest V4 #567 On Fri, 8 Oct 1999, DIY_EFI Digest wrote: > >sensor, which means you need the flywheel, transfer case and the actual > >sensor. > > Surely it doesn't have to be *that* accurate? Why not use the coil? 2 per > Rev should be enough, you only need speed not accurate position? No, it does. You have to have a very good accuracy (I think the minimum is 6 "steps" per revolution) because otherwise the system will get confused when the engine changes speed quickly. ------------------------------ Date: Fri, 8 Oct 1999 10:28:16 -0700 (PDT) From: Orin Eman Subject: Re: HTML posts > Could everyone please set thier email clients to send plain text. > HTML is for websites. > I hope I'm not the only one who feels this way. You aren't. It's pretty unreadable to my client. Keep it to plain text please. Orin, list admin. ------------------------------ End of DIY_EFI Digest V4 #568 ***************************** 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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