DIY_EFI Digest Thursday, 9 May 1996 Volume 01 : Number 134 In this issue: Variable cam timing again re: Variable cam timing again FPGA/CPLD software Re: Injector controller (attached) re: Variable cam timing again Re: Injector controller (attached) Re: Injector controller (attached) Re: Injector controller (attached) someone willing to sell cs453 inj drivers Re: Injector controller (attached) Re: someone willing to sell cs453 inj drivers search See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- From: Bruno! Date: Thu, 9 May 1996 02:32:24 +1000 (EST) Subject: Variable cam timing again Hi everyone, Thanks for your ideas on this topic. A couple of you pointed out that duration at high rpm would be a limiting factor to the overall performance. So what I thought about was again with the synchro idea - the phase of the two would be controlled by computer, what could happen is that if the cam duration is set to be optimised in the low rpw range, when it goes into the higher rpm range, the valve opening time could be extended by altering the amount of slip in the two motors. what essentially happens here is that the cam gear is not spinning at a constant speed, rather varying sinusoidally. Relative to the speed of the crank, if the cam gear is rotating slower, the valve is opened for longer. when the valve is supposed to be closed, the motors controlling the cams could then speed them up, setting the timing straight again. There would not be a sudden jump from one engine mode (such as selecting from two cam profiles mechanically, such as in a vtec type system), i.e. the sinusoidal control could come on gradually. Bruno. (u933234@xxx.au) "A sewer rat might taste like pumpkin pie, but I wouldn't know cos I don't eat the filthy muthaf***a" ------------------------------ From: SRavet@xxx.com Date: Wed, 8 May 96 14:21:48 CDT Subject: re: Variable cam timing again Bruno! Wrote: | | Hi everyone, | | Thanks for your ideas on this topic. A couple of you pointed out that | duration at high rpm would be a limiting factor to the overall | performance. | | So what I thought about was again with the synchro idea - the phase of the | two would be controlled by computer, what could happen is that if the cam | duration is set to be optimised in the low rpw range, when it goes into | the higher rpm range, the valve opening time could be extended by altering | the amount of slip in the two motors. what essentially happens here is | that the cam gear is not spinning at a constant speed, rather varying | sinusoidally. Relative to the speed of the crank, if the cam gear is | rotating slower, the valve is opened for longer. when the valve is | supposed to be closed, the motors controlling the cams could then speed | them up, setting the timing straight again. | | There would not be a sudden jump from one engine mode (such as selecting | from two cam profiles mechanically, such as in a vtec type system), i.e. the | sinusoidal control could come on gradually. But the cam can't turn slower than the crank, at least not for very long, unless it turns faster later on to make up the difference. Or were you suggesting that it speeds up and slows down during each revolution. That could work. Other wise it gets later and later until the valves are opening/closing at the totally wrong times. As someone else mentioned, these schemes just modify cam timing. The real gains would be being able to control overlap, etc. I don't see how you could get that kind of control while using a cam shaft. Ed, are you going to say anything else about this, or are you going to let your remark just lie there???? :-) | | Bruno. (u933234@xxx.au) | | "A sewer rat might taste like pumpkin pie, but I wouldn't know cos I | don't eat the filthy muthaf***a" | | Steve Ravet sravet@xxx.com Baby you're a genius when it comes to cooking up some chili sauce... ------------------------------ From: SRavet@xxx.com Date: Wed, 8 May 96 15:18:08 CDT Subject: FPGA/CPLD software I posted a note last week about the Lattice and Cypress PLD software. I am this close ----> <----- to buying the Cypress VHDL compiler, when I get it I'll tell everyone what I think of it. Someone had questioned whether the Cypress $99 software included FPGA support, I have the answer to that. Right now there are two packages. CY3121 (Warp2) for PLDs and CPLDs, includes vhdl compiler, functional simulator, etc. It costs $99. CY3120 (Warp2+) is similar, but has the place and route stuff to do FPGAs. It costs $995. Real Soon Now (May 17) the new version of Warp 2 comes out (4.0), which includes PLDs, CPLDs, and FPGAs, except it won't do timing analysis on FPGAs. It has timing models that other tools can use, but it won't do the analysis itself. This will be available for $99. It's strictly VHDL, which means no schematic capture, etc. Steve Ravet sravet@xxx.com Baby you're a genius when it comes to cooking up some chili sauce... ------------------------------ From: cmorris@xxx.com (Charles) Date: Wed, 8 May 1996 15:00:14 -0700 Subject: Re: Injector controller (attached) You wrote: > Hi, > Can this be decoded as I do not have MIME compatable tools, > Email : dchannon@xxx.au What exactly does this mean? All you need is a copy of PKUNZIP (shareware). Can someone help out David? The unzipped file is almost 2 Mb...inefficient plotting software, I guess, but that's too long to send! - -Charles ------------------------------ From: Daniel Ridge Date: Wed, 8 May 1996 18:41:40 -0400 (EDT) Subject: re: Variable cam timing again Hi everyone! > to control overlap, etc. I don't see how you could get that kind of > control while using a cam shaft. I don't expect that you can have this kind of control with a camshaft. I have a Lampredi designed 4cyl SOHC in my '77 Fiat. The cam is in a seperate casting above the head and acts directly on the tappets. I have oft wondered whether the cam might be replaced altogether with 8 computer driven hydraulic solenoids. Arbitrary valve timing schedules would become available. ______________________________________________________________________ Daniel Ridge | USRA CESDIS Technical Specialist | Code 930.5 email: newt@xxx. W274 tel: 301-286-4403 | Goddard Space Flight Center fax: 301-286-1777 | Greenbelt, MD. 20771 _____________________________________|________________________________ ------------------------------ From: James C Patterson Date: Wed, 8 May 1996 16:21:27 -0700 (PDT) Subject: Re: Injector controller (attached) On Wed, 8 May 1996, Charles wrote: > > You wrote: > > Hi, > > Can this be decoded as I do not have MIME compatable tools, > > Email : dchannon@xxx.au > > What exactly does this mean? All you need is a copy of PKUNZIP > (shareware). Can someone help out David? The unzipped file is almost 2 > Mb...inefficient plotting software, I guess, but that's too long to > send! He may be need a mail program which can handle MIME attachments and decode them back to their original format (zip in this case). This is typically handled by the mail program but there are also programs which can decode a saved file if your mailer does not support MIME format. Check a shareware/freeware site for the applicable operating system. James Patterson james@xxx.edu ------------------------------ From: Daniel Ridge Date: Wed, 8 May 1996 19:57:20 -0400 (EDT) Subject: Re: Injector controller (attached) > > Can this be decoded as I do not have MIME compatable tools, > > Email : dchannon@xxx.au > > What exactly does this mean? All you need is a copy of PKUNZIP > (shareware). Can someone help out David? The unzipped file is almost 2 > Mb...inefficient plotting software, I guess, but that's too long to > send! Hi! The files are available from: ftp://efi332.eng.ohio-state.edu \ /pub/diy_efi/reader_contributions/inj_controller_cmorris@xxx.com just ftp them. ______________________________________________________________________ Daniel Ridge | USRA CESDIS Technical Specialist | Code 930.5 email: newt@xxx. W274 tel: 301-286-4403 | Goddard Space Flight Center fax: 301-286-1777 | Greenbelt, MD. 20771 _____________________________________|________________________________ ------------------------------ From: David Channon Date: Thu, 9 May 1996 11:13:15 +1000 (EST) Subject: Re: Injector controller (attached) > > > You wrote: > > Hi, > > Can this be decoded as I do not have MIME compatable tools, > > Email : dchannon@xxx.au > > What exactly does this mean? All you need is a copy of PKUNZIP The file in on the ftp archive is the mesage you have sent with the zip file encoded using MIME tools rather than say Unix uuencode, My mail handler does not have MIME capability so I cannot extract the zip file. If the zip file was uploaded to the archive then I can handle it from there. So could someoe email the uuenocded zip file to me (My spool can handle up to 10MB) or better would be upload the zip file to the archive. > (shareware). Can someone help out David? The unzipped file is almost 2 > Mb...inefficient plotting software, I guess, but that's too long to > send! Thanks David. - -- - ----------------------------------------------------------------- David Channon .-_|\ Department of Computer Science / \ The University of Newcastle \.--._/ NSW, 2308, AUSTRALIA v Email : dchannon@xxx.au URL : http://wwwcs.newcastle.edu.au/Research/VMRG/dchannon.html - ----------------------------------------------------------------- "Beware of bugs in the above code; I have only proved it correct, not tried it." -- Donald E. Knuth ------------------------------ From: pantera@xxx.com (David Doddek) Date: Wed, 8 May 1996 23:48:33 -0500 Subject: someone willing to sell cs453 inj drivers I have recently went into production of my first EFI system and I am using the Cherry 4/1 amp part (cs453). I would be willing to sell them to the net EFI people in small quantities since I have plenty at the moment. Let me know if there is any interest. If you want some send $6.25 each plus 6.25% tax if in Illinois and $2.00 shipping to: SGD Electronics 2902 N Sangamon Rd Decatur Il 62521 Hope this is of some help. By the way, my efi system is only $345 if any one is interested in that. I don't want this to sound like an advertisement, but am just trying to fill a need that has been requested. David J. Doddek |pantera@xxx.com Owner SGD Electronics & Development Engr for Caterpillar |h 309 685-7965 Formula SAE Team Sidewinder 94-95 |w 309 578-2931 89 T-bird SC, 69 Fairlane w/SGD EFI |fx 217 428-4686 74 Pantera w/Electromitive Tec-II Twin turbos and Nitros | Hey, If you are going to go fast, go REEEAAL FAST. | ------------------------------ From: John S Gwynne Date: Thu, 09 May 96 01:09:48 -0400 Subject: Re: Injector controller (attached) - -------- In message <199605090113.LAA27468@xxx.au> , you write: | The file in on the ftp archive is the mesage you have sent with the | zip file encoded using MIME tools rather than say Unix uuencode, | My mail handler does not have MIME capability so I cannot extract | the zip file. If the zip file was uploaded to the archive then | I can handle it from there. So could someoe email the uuenocded | zip file to me (My spool can handle up to 10MB) or better would be | upload the zip file to the archive. I've unpack the zip file from the original posting and have also placed that on the ftp site. There are a lot of packages that unpack MIME, it would be worth your time to download one. | *.TOP - top layer | *.BOT - bottom layer | *.SSC - silkscreen | *.PRN - printable schematic | (the above are formatted for HP Laser Jet printers) "formatted for HP Laser Jet printers"... I can't wait to pipe a 528K file to /dev/plp... I bet I end up with a stack of paper with one or two characters on each page :). Is there a viewer that will display this? John S Gwynne Gwynne.1@xxx.edu _______________________________________________________________________________ T h e O h i o - S t a t e U n i v e r s i t y ElectroScience Laboratory, 1320 Kinnear Road, Columbus, Ohio 43212, USA Telephone: (614) 292-7981 * Fax: (614) 292-7297 - ------------------------------------------------------------------------------- ------------------------------ From: cal@xxx.com (Cal Smith) Date: Wed, 8 May 1996 23:56:09 -0600 Subject: Re: someone willing to sell cs453 inj drivers David, What are the specs on your EFI system? What sensors does it utilize? How is it programmed? Needless to say, I'm interested. :-) Cal Smith ------------------------------ From: hunter Date: Wed, 08 May 1996 23:50:31 -0700 Subject: search Has anyone heard of a company called "Simple Digital Systems" I was in search of a way to contact them, phone number, address etc. Thanks Steve ------------------------------ End of DIY_EFI Digest V1 #134 ***************************** 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".