DIY_EFI Digest Tuesday, February 8 2000 Volume 05 : Number 056 In this issue: RE: Measuring EGT on all cylinders? RE: DIY_EFI Digest V5 #55 Test RE: ECU7 PCB layout Re: Measuring EGT on all cylinders? Fuel Pressure with Holley Injectors sans cams [none] See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Mon, 07 Feb 2000 05:01:10 -0800 From: Carl Summers Subject: RE: Measuring EGT on all cylinders? Hi Jorgen, There is a company called Hereaus that makes a robust sensor although it is not K-type if that is what your electronics are set up for...it is a RTD device...I don't have their URL or phone number handy....Steve Gorkowski on this list is very familiar with this product and I hope he jumps in and posts it...ttyl - -Carl Summers - -----Original Message----- From: owner-diy_efi@xxx.org]On Behalf Of Jörgen Karlsson Sent: Sunday, February 06, 2000 2:36 PM To: DIY_EFI Mailinglist Subject: Measuring EGT on all cylinders? Hi I am planning to run a EGT probe for every cylinder. The only experience I have with small fast probes near the ports is from a dragraced V8. The probes sometimes burnt up and left with the exhaust flow, not a problem for them, their engine was not turbocharged, mine is... Can anyonne recommend a good probe that is robust and fast. Jörgen Karlsson Gothenburg, Sweden. - ---------------------------------------------------------------------------- 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 ------------------------------ Date: Mon, 7 Feb 2000 09:45:34 -0500 From: "Flanagan, Stephen CECOM RDEC STCD" Subject: RE: DIY_EFI Digest V5 #55 Date: Sun, 6 Feb 2000 23:35:34 +0100 From: =?iso-8859-1?Q?J=F6rgen_Karlsson?= Subject: Measuring EGT on all cylinders? Hi I am planning to run a EGT probe for every cylinder. The only experience I have with small fast probes near the ports is from a dragraced V8. The probes sometimes burnt up and left with the exhaust flow, not a problem for them, their engine was not turbocharged, mine is... Can anyonne recommend a good probe that is robust and fast. Jorgen Karlsson Gothenburg, Sweden. - - - ---------------------------------------------------------------------------- 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, 6 Feb 2000 16:35:57 -0700 From: bearbvd@xxx.net (Greg Hermann) Subject: Re: Measuring EGT on all cylinders? >Hi >I am planning to run a EGT probe for every cylinder. The only experience I >have with small fast probes near the ports is from a dragraced V8. The >probes sometimes burnt up and left with the exhaust flow, not a problem for >them, their engine was not turbocharged, mine is... Can anyonne recommend a >good probe that is robust and fast. > >Jorgen Karlsson >Gothenburg, Sweden. Barry Grant Fuel Systems, Dalhonega, Georgia, USA Greg > I have used the Corsa EGT sensors (they make the data recorder) on a 1600 HP turbo (Ford 302) and have seen temps as high as 1850 F, only had one failure during the whole first season using them, and Corsa sent a replacement for free. Try www.corsa-inst.com good luck steve - ---------------------------------------------------------------------------- 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: Mon, 07 Feb 2000 09:02:59 -0800 From: garwillis@xxx.com (Garfield Willis) Subject: Test traffic suddenly disappeared, so do I have a problem, or ... Gar - ---------------------------------------------------------------------------- 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: Mon, 7 Feb 2000 10:02:46 -0800 From: "Al Lipper" Subject: RE: ECU7 PCB layout Dominic, You have some good questions. First, the gerber files specify the width of each trace and pad as an aperture. This means that the outlines you are getting is a result of some setting in the gerber viewer you are using, and not in the file itself (I tried the file with two other viewers and traces were filled). Next, there are a number of errors on the PC board. First, look at the new schematic for changes to the optoisolator circuits, fuel pump driver, stepper motor enable and the orientation of the DB-25 connector (P-2). Next, there is an erroneous short between two traces going to the driver transistor for injector #1 (Q1, I believe). This trace should be eliminated. Next, on the CPU board, there is a problem with the RD and WR lines being connected together and run as a single trace to the support chips. The schematic is correct, but OrCAD did something unusual when it created the netlist, so these were incorrectly indicated as a single circuit. Also, the holes for the inter-board connector (P1) are slightly small. Otherwise, the boards are overall correct. BTW, all of the ground signals do get connected together at one point. Also, I am using an 18" ribbon cable between the boards with no problem. Over the next month or so, we'll be revising them. In the meantime, these corrections should take care of most major issues. BTW, I have a pair of them running relatively well at the moment. Good luck. Al - -----Original Message----- From: Dominic Baker [mailto:dombaker@xxx.uk] Sent: Saturday, February 05, 2000 12:42 PM To: efi@xxx.org Subject: Al Lipper ECU7 Dear Al, I mailed u a couple of weeks ago about sending the ECU7 pcb etching traces in an alternative format, well that is no longer a problem There is a great Free Gerber viewer, with complete printing, saving and editing facilities on the Lavenir web site, the viewer is called "Viewmate6.1" if you want to pass that on to anyone else. Anyway I am ready to make the boards up at university, I had a word with the head of electronics but unfortunately he is not prepaired to make up any number of these boards, but he will do a one off for me, I asked him because I saw you were having trouble with the small batch prices. I have but a couple of problems, One is that ECU7B(injector controller board) Top view the pads are fine, but the traces are double outlined instead of filled, the viewer I have cannot change this back, but I can edit them by hand as there are not too many of them. Before I do this, are there any newer later updates to the schematics/PCB boards I should know about before I commit to these boards being made? This board also has a problem around the fuse and the two relays, which is quite confusing. Being as I am redrawing the traces this is a grey area that needs clearing up. The other question I have is about the earths. There are many of these and several types eg, GND,DGND, ChassisGND etc. I have all the drawings including the component overlay(silkscreen) on transparancy so I can look through the boards to trace the paths to check for any errors. A lot of the earths are clustered together with a track, but nothing joins these to the actual GND. Do the two boards have to piggy back a short distance apart with pins joining the earths batween the two boards? Or do all the GND's have to be connected to say a metal box which is earthed to the chassis? Or even Connect a wire between all like earths, then connect that to the chassis? I apologise for this long and teadious email but If I can clear these small problems up then I can start making the ECU7 efi, straight away. Your help would be kindly appreaciated Yours hopefully Dom Baker Thanks - ---------------------------------------------------------------------------- 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: Mon, 07 Feb 2000 13:25:39 +0000 From: Ade + Lamb Chop Subject: Re: Measuring EGT on all cylinders? At 23:35 06/02/00 +0100, Jörgen Karlsson wrote: >Hi >I am planning to run a EGT probe for every cylinder. The only experience I >have with small fast probes near the ports is from a dragraced V8. The >probes sometimes burnt up and left with the exhaust flow, not a problem for >them, their engine was not turbocharged, mine is... Can anyonne recommend a >good probe that is robust and fast. One of the thermocouple will do the job. They are available for all temperature ranges... Ade - ---------------------------------------------------------------------------- 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: Mon, 7 Feb 2000 22:31:00 -0600 From: "Shane Buss" Subject: Fuel Pressure with Holley Injectors I'm running very lean with 65# injectors on my holley 670cfm tbi unit... Im running about 16psi with the stock fuel pump... How high can i effectively turn up the pressure? I heard with the chrysler injectors holley uses above 17-20psi could cause problems... How high is the stock fuel pump good for also.. Thanks, Shane - ---------------------------------------------------------------------------- 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: Tue, 08 Feb 2000 01:00:24 -0800 From: jefg@xxx.net Subject: sans cams I'm delurking to pass this on, I'm a bit behind on the digests so hopefully this isn't a repeat. This has been around for a while, and is very intriguing. Now, drive this will stepper motors and you can adjust just about all the cam variables (opening, durration, overlap) with your CPU on the fly. http://www.coatesengine.com/ BTW, I've heard from various sources that this may be one of those deals where business management style may kill this idea even if the technical challenges do not. You'll notice an overt lack of real detail. - -- - ----------------------------------------------------------------------- Jeff jefg@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: Tue, 08 Feb 2000 07:34:25 EST From: "Bill Hoffman" Subject: [none] Did you ever find the information you were looking for on the 882 heads? I have them on my Corvette and was trying to find the same information. I would greatly appreciate it if you could share any information that you have. Thanks, Bill ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.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 ------------------------------ End of DIY_EFI Digest V5 #56 **************************** 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".