DIY_EFI Digest Friday, 8 November 1996 Volume 01 : Number 339 In this issue: Dr. Dobbs Journal - TPU article Re: Need a 15lb/hr injector...hmmm. Big block Chevy Manifold Re[2]: Need a 15lb/hr injector...hmmm. Re: Need help with Mazda EFI. Holden Astra Problem Re: 2 stroke injection experiences? Re: Need help with Mazda EFI. re: Holden Astra Problem re: 2 stroke injection experiences? 332 system Re: Holden Astra Problem 332 again See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- From: Jody Shapiro Date: Thu, 7 Nov 1996 20:20:24 -0500 (EST) Subject: Dr. Dobbs Journal - TPU article There's an article in the 12/96 issue of Dr. Dobbs Journal titled "Inside Motorola's TPU" by Richard Soja. He discusses the TPU in detail, engine management systems, and working with the MC68332. DDJ has a web site at http://www.ddj.com but they have the November issue online, not the December one. The author's email address is: Soja_Richard_LOCAL_at_DEVTOOLS@xxx.com Perhaps he might be interested in joining the EFI332 list... :) - -Jody ------------------------------ From: "John Faubion" Date: Thu, 7 Nov 1996 19:45:54 -0600 Subject: Re: Need a 15lb/hr injector...hmmm. > For a little larger, try the Mustang 5.0l (19lb) Chevy 305 tpi (22lb) GM 350 > tpi (24lb) Mustang SVO turbo (35lb). Well David I'm not sure where you got your figures but the TPI 305 injectors are 17.88 lb/hr and the TPI 350 are 20.73 lb/hr. At least those using the Lucas injectors from the factory. Maybe the Bosch injectors are different. In addition the Lucas injectors in the Ford 1.6L are rated at 13.98 lb/hr. ------------------------------ From: "John Faubion" Date: Thu, 7 Nov 1996 20:04:45 -0600 Subject: Big block Chevy Manifold Hello everyone! I need another big block Chevy oval port single plane intake. Some examples that would work are the Holley Street Dominator, Edlebrock Torker 2-O, old Edlebrock Tarantula. I have an Torker 2-O that I just modified for injectors and now have a second engine I want to EFI. This new engine is 408 inches. Like the current project I'm planning on using a #730 ECM. For this one I'll use an aftermarket CalPak programmed for a 408" small block. This one is going to go into my 1970 Corvette for a while so I'll need to find a fairly short manifold like the Street Dominator. Any one know of one for sale? ------------------------------ From: dzorde@xxx.au Date: Fri, 08 Nov 96 11:04:07 Subject: Re[2]: Need a 15lb/hr injector...hmmm. As far as I know the Bosch injectors are 19lb/hr for 305 and 22lb/hr for 350, although I may be wrong. Dan dzorde@xxx.au ______________________________ Reply Separator _________________________________ Subject: Re: Need a 15lb/hr injector...hmmm. Author: diy_efi@xxx.edu at INTERNET Date: 11/8/96 10:55 AM > For a little larger, try the Mustang 5.0l (19lb) Chevy 305 tpi (22lb) GM 350 > tpi (24lb) Mustang SVO turbo (35lb). Well David I'm not sure where you got your figures but the TPI 305 injectors are 17.88 lb/hr and the TPI 350 are 20.73 lb/hr. At least those using the Lucas injectors from the factory. Maybe the Bosch injectors are different. In addition the Lucas injectors in the Ford 1.6L are rated at 13.98 lb/hr. ------------------------------ From: Fred Miranda Date: Thu, 7 Nov 1996 19:06:16 -0800 Subject: Re: Need help with Mazda EFI. Fouled/flooded plugs may not fire a timing light. Either change them or try setting a plug(still connected) on the engine and watch for spark. >Yeah, I strapped the timing light onto each of the three coils to check for >spark and didn't get any on any of the coils. All of the switching >transistors for firing the injectors are run by T304 on the board (that >Toshiba Japan IC I asked about), and I checked the transistors last night >(sort of) and it appears that they are ok. That pretty much only leaves the >IC that drives them. ------------------------------ From: dzorde@xxx.au Date: Fri, 08 Nov 96 11:47:27 Subject: Holden Astra Problem Does anyone know anything about Holden Astra SLE 1989's, a friend at work has a problem with it. Don't know if there are any US, etc versions of this car but hopefully someone in OZ has an answer. Essentially the problem is that whilst cruizing the car dies when you try to accelerate. When you restart, the car idles until you again try to accelerate, then it dies again. It has finally got to the stage when it doesn't even idle. I think its a MAF system. Anyone got any ideas ? Dan dzorde@xxx.au ------------------------------ From: "John Faubion" Date: Thu, 7 Nov 1996 22:04:27 -0600 Subject: Re: 2 stroke injection experiences? > Anyone on the list have experience of single or multi cylinder 2 stroke > injection form a practical point of view? I have been considering this for my race kart. Since I'm portly (for kart racing!) at 210 lb., the only real problems are: 1) finding an injector that is small enough and 2) the weight penalty of the ECM and battery to power the system 3) at 14,000 plus RPM the time to fire an injector is only ~4 ms That last one is probably the killer. Four milliseconds is beyond the current limits of injector technology. The smallest injectors I've found are 13.8 lb./hr and an 18hp 100cc kart engine would only need about 8.5 lb./hr. So using a electric pump for a motorcycle at around 15 psi would flow about right. This may not allow the injector to flow properly which may add more problems than a Walbro. Even if we did find the right size injector and could fire it fast enough, we would still need an ECM ( Date: Thu, 07 Nov 1996 23:11:01 -0500 Subject: Re: Need help with Mazda EFI. At 19:06 11/7/96 -0800, you wrote: >Fouled/flooded plugs may not fire a timing light. >Either change them or try setting a plug(still connected) on the engine and >watch for spark. The plugs are fine. Not only do they have only about 2000 miles on them, and I rarely drive at less than full power so deposits get burned off, but I've checked them to see if they are relatively clean, and I also kinda discount the idea that all four would die at once. I also tried slightly disconnecting the wires one at a time to see if the coil would arc to the wire (which I saw it do once when I didn't get one of the trailing wire on correctly) and it wouldn't even do that. I am quite sure that the ignition circuitry is dead, so I'm going to get another computer to try, and see if I can fix my old one in my spare time just to learn more about it. Anyway, thanks for all the suggestions folks, and I'll be sure to post a good detailed message if I ever manage to fix the old one. FWIW, if you have one of these cars and are having an idle control problem, take a look at T801 on the main board, it eventually degrades from the heat and then idle load compensation no longer functions correctly. Justin "Tuck" Cordesman SOLID BRASS-> I've been set on fire for Sally Field, Gone fast with a girl named Bo... Let the Ass Kicking Commence. ------------------------------ From: RABBITT_Andrew@xxx.au Date: Fri, 8 Nov 1996 13:05:14 est Subject: re: Holden Astra Problem >Does anyone know anything about Holden Astra SLE 1989's, a friend at >work has a problem with it. >Essentially the problem is that whilst cruizing the car dies when you >try to accelerate. When you restart, the car idles until you again >try to accelerate, then it dies again. It has finally got to the >stage when it doesn't even idle. >Anyone got any ideas ? Check fuel pressure, it could be that your fuel pump is on the way out, has poor electrical connections or something similar. ------------------------------ From: RABBITT_Andrew@xxx.au Date: Fri, 8 Nov 1996 13:17:28 est Subject: re: 2 stroke injection experiences? >Anyone on the list have experience of single or multi cylinder 2 >stroke injection form a practical point of view? we do fuel injected 2-s here for a living, DI though! >Problems that arise on the theoretical level are passing an oil / >fuel mix (viscosity?) through a standard injector most EFI 2-strokes use a separate oil pump (mostly Mikuni), injecting the oil upstream of the inlet reeds. Check out the EFI outboards for some ideas. >and monitoring an oily exhaust with a lamda sensor. a two stroke will have an apparently lean exhaust due to scavenging losses. Even if the inlet charge is 14.7, the exhaust will have a high oxygen content due to the 20+% scavenging losses out the exhaust, therefore a conventional switching type EGO will not be much use to you. >Finally,where to inject,on both rotary valved and reed valved >engines? Not real sure here, but I think normally just down stream of the throttle blade. You may be able to reduce scavenging losses by timing the injection into the transfer ports, but without a heap of development it could be a bit hit-and-miss. (note that lower losses means better fuel consumption, means less fuel mass for the same race. Could (partially) overcome any weight penalty.) Andrew Rabbitt Orbital Engine Company (but the opinions are mine) ------------------------------ From: "P. Buijs QCL" Date: Fri, 8 Nov 96 09:02:21 CET Subject: 332 system In-Reply-To: note of 96-11-08 01:37 official name : cim.cim.swin.edu.au ip : 136.186.9.15 alias: www.cim.swin.edu.au cheers, paul End of Message ------------------------------ From: peter paul fenske Date: Fri, 08 Nov 1996 00:03:10 -0800 Subject: Re: Holden Astra Problem At 11:47 AM 11/8/96, you wrote: > > > Does anyone know anything about Holden Astra SLE 1989's, a friend at > work has a problem with it. > > Don't know if there are any US, etc versions of this car but hopefully > someone in OZ has an answer. > > Essentially the problem is that whilst cruizing the car dies when you > try to accelerate. When you restart, the car idles until you again > try to accelerate, then it dies again. It has finally got to the > stage when it doesn't even idle. > > I think its a MAF system. > > Anyone got any ideas ? > > Dan dzorde@xxx.au > Hi Dan to test the MAF one usually taps it and sees if a fault can be generated. In most north american GMs disconnecting the MAF will put the car into backup and then it will run. Ie if it runs with the MAF disconnected then the MAF or its relays is at fault. GL: peter ------------------------------ From: Mark Pitts Date: Fri, 8 Nov 1996 09:45:10 -0000 Subject: 332 again Sorry guys, I just cant access the efi332 system, if sombody has the = files, could you please mail them to saxon@xxx.org Thanks Mark or if ya can remember the alternate sight the holds it, let me know, or = if you would like me to put another copy on keg.zymurgy.org, also let me = know (but I can only do that if I can get the files!) Mark ------------------------------ End of DIY_EFI Digest V1 #339 ***************************** 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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