DIY_EFI Digest Tuesday, February 29 2000 Volume 05 : Number 078 In this issue: Wire up an "A/F gage" w/o effecting existing control system? misc math spreadsheet Re: Wire up an "A/F gage" w/o effecting existing control system? cheap data aq system Re: Wire up an "A/F gage" w/o effecting existing control system? Re: cheap data aq system Another newbie and his project Re: cheap data aq system Re: Another newbie and his project Re: cheap data aq system Re: Wire up an "A/F gage" w/o effecting existing control system? Re: New files on FTP site See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Mon, 28 Feb 2000 09:11:19 -0500 From: Aribert_Neumann@xxx.ca Subject: Wire up an "A/F gage" w/o effecting existing control system? I asked this question a while back as part of a larger series of questions but did not get a response. Can I hook up a cheapie "A/F gage" like a Cyberdyne brand by simply splicing into the wire from my O2 sensor or will the A/F gage degrade the signal from the O2 sensor to such an extent that I need to use an A / B switch to switch the O2 signal between the A/F gage and the ECU? FWIW, I am using a Bosch Motronic M1.5 engine management system (originally on a 2.0L GME engine) grafted onto a 2.3L Isuzu engine. - ---------------------------------------------------------------------------- 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, 28 Feb 2000 09:28:30 -0600 From: steve ravet Subject: misc math spreadsheet Jason Haines sent me a miscellaneous math spreadsheet which is on the ftp site in incoming, miscmath.xls. It does hp/torque/kw conversions, and has a bunch of conversion constants, and physical constants for various fuels. - --steve - -- Steve Ravet steve.ravet@xxx.com ARM,Inc. www.arm.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: Mon, 28 Feb 2000 11:35:25 From: Bob Tom Subject: Re: Wire up an "A/F gage" w/o effecting existing control system? At 09:11 AM 2/28/00 -0500, you wrote: >I asked this question a while back as part of a larger series of questions but >did not get a response. Can I hook up a cheapie "A/F gage" like a Cyberdyne >brand by simply splicing into the wire from my O2 sensor or will the A/F gage >degrade the signal from the O2 sensor to such an extent that I need to use an A >/ B switch to switch the O2 signal between the A/F gage and the ECU? FWIW, I >am using a Bosch Motronic M1.5 engine management system (originally on a 2.0L >GME engine) grafted onto a 2.3L Isuzu engine. For what it's worth, I'm using a digital one from Intellitronix on my Dakota and I tapped into the wires up in the engine bay just before the computer. Everything seems to be operating normally. Bob. Southern Ontario, Canada. 97 Dakota CC Sport,5.2L,3.55SG, auto.,4x2: best 14.917s, 90.78mph 85 Shelby Intercooled Turbo Charger,2.2L,5-spd man. 78 B100 Dodge van, '69 340-4bbl 70 Challenger,383-4bbl,slap-stik auto.,3.23SG,hemi orange,46,700 orig.mi. - ---------------------------------------------------------------------------- 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, 28 Feb 2000 13:04:54 -0500 From: "Braman Wing" Subject: cheap data aq system This is a multi-part message in MIME format. - ------=_NextPart_000_0012_01BF81EC.67E9BE20 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Someone posted a message a couple of days ago about looking for a = schematic for a cheap data aq system. I have found a schematic for a 11 = channel, 8-bit D-A system with a parallel port interface. It is based on = the Motorola MC145050. I got a 486 laptop on Ebay for $50, and the parts = were about $20. I am hoping to start prototyping it this week. Since I = have very little electronics experience, I expect it to be a challenge, = to say the least. however, if it works it will be great, since it is = very simple and cheap to build. If anyone is interested, please email me = and I will send the schematic and parts list. It would be great to have = someone else working on it who knows what they are doing! I have a = feeling the design can be improved upon, but I want to at least get it = working before I start messing with it too much. If there is any = interest and the thing is successful, I might try to have some PC boards = made up and do a group buy for the lists.=20 Braman - ------=_NextPart_000_0012_01BF81EC.67E9BE20 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Someone posted a message a couple of = days ago about=20 looking for a schematic for a cheap data aq system. I have found a = schematic for=20 a 11 channel, 8-bit D-A system with a parallel port interface. It is = based on=20 the Motorola MC145050. I got a 486 laptop on Ebay for $50, and the parts = were=20 about $20. I am hoping to start prototyping it this week. Since I have = very=20 little electronics experience, I expect it to be a challenge, to = say the=20 least. however, if it works it will be great, since it is very simple = and cheap=20 to build. If anyone is interested, please email me and I will send the = schematic=20 and parts list. It would be great to have someone else working on it who = knows=20 what they are doing! I have a feeling the design can be improved upon, = but I=20 want to at least get it working before I start messing with it too much. = If=20 there is any interest and the thing is successful, I might try to have = some PC=20 boards made up and do a group buy for the lists.
 
Braman
 
 
- ------=_NextPart_000_0012_01BF81EC.67E9BE20-- - ---------------------------------------------------------------------------- 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, 28 Feb 2000 12:26:07 -0600 From: MysticZ Subject: Re: Wire up an "A/F gage" w/o effecting existing control system? Aribert_Neumann@xxx.ca wrote: > > I asked this question a while back as part of a larger series of questions but > did not get a response. Can I hook up a cheapie "A/F gage" like a Cyberdyne > brand by simply splicing into the wire from my O2 sensor or will the A/F gage > degrade the signal from the O2 sensor to such an extent that I need to use an A > / B switch to switch the O2 signal between the A/F gage and the ECU? FWIW, I > am using a Bosch Motronic M1.5 engine management system (originally on a 2.0L > GME engine) grafted onto a 2.3L Isuzu engine. I've never heard of it causing any problems on LT1 Camaros and Firebirds, myself. And if you want a real cheapie, I have the schematics for an A/F guage around here somewhere. - -- Steve 97 Chevy Camaro Z28, Mystic teal, A4, not stock 90 Kawasaki EX500A4, black, M6, not even CLOSE to stock! lt1_z28@xxx.net/~lt1_z28 Aluminum, steel, carbon fiber, titanium, and two cast iron balls. McMillan Motorsports- http://www.mmsbikes.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: Mon, 28 Feb 2000 13:22:29 -0500 From: "Charles Brooks" Subject: Re: cheap data aq system How about posting it to the FTP site under a file name like cheap_daq or something similar? Try to find a book on operational amplifiers (op-amps) and a handful of of 741 op-amps for signal conditioning and isolation. They're very cheap, easy to work with and have gain up to around 10k or so for use with thermocouples and the like. You'll still have to do the linearization via software but it's a BIG help in improving the resolution for low level signals. Watch for ground loops, and try to use a well regulated power supply. Both of those have bit me in the kiester before :) Charles Brooks Mid-Atlantic Speed Shop http://www.massmotorsports.com - ---------- Original Message ---------------------------------- From: "Braman Wing" Date: Mon, 28 Feb 2000 13:04:54 -0500 >Someone posted a message a couple of days ago about looking for a schematic for a cheap data aq system. I have found a schematic for a 11 channel, 8-bit D-A system with a parallel port interface. It is based on the Motorola MC145050. I got a 486 laptop on Ebay for $50, and the parts were about $20. I am hoping to start prototyping it this week. Since I have very little electronics experience, I expect it to be a challenge, to say the least. however, if it works it will be great, since it is very simple and cheap to build. If anyone is interested, please email me and I will send the schematic and parts list. It would be great to have someone else working on it who knows what they are doing! I have a feeling the design can be improved upon, but I want to at least get it working before I start messing with it too much. If there is any interest and the thing is successful, I might try to have some PC boards made up and do a group buy for the lists. > >Braman > > > > >---------------------------------------------------------------------------- >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, 28 Feb 2000 12:46:16 -0600 From: MysticZ Subject: Another newbie and his project I've been lurking for a while seeing what the group was like and decided to open my mouth now. I'm slowly working on a fuel injection system for my 90 model Kawasaki EX500. I'm planning to use a TBI batch fire type system. The engine is a 2 cylinder 500cc parallel twin with a 180 degree firing order and dual carbs. Unless I come up with a new plan I'm going to use throttle position and RPM to look up entries on the fuel map. I also plan on adding some programming to boost fuel when the throttle is opened rapidly. I'd also like to use a higher than normal fuel pressure to help atomize the fuel at higher RPM since the redline is 11,000. That's also the reason for TBI instead of multi-port. I considered using a computer from the smallest 4 cylinder I can find (Geo Storm or similar) with dual injectors per cyl. Unfortunately the O2 sensor setup will be a compromise as the header is over 50% of the entire length of the exhaust and if I put the sensor in the collector it won't get hot enough to work. - -- Steve 97 Chevy Camaro Z28, Mystic teal, A4, not stock 90 Kawasaki EX500A4, black, M6, not even CLOSE to stock! lt1_z28@xxx.net/~lt1_z28 Aluminum, steel, carbon fiber, titanium, and two cast iron balls. McMillan Motorsports- http://www.mmsbikes.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: Mon, 28 Feb 2000 13:49:49 -0600 From: "Christian J. Knudstrup" Subject: Re: cheap data aq system This is a multi-part message in MIME format. - ------=_NextPart_000_0141_01BF81F2.AE6AB240 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I like how this might work. I already have two laptops to use one is an = old 286 and my current Pentium 200 which I hope is soon to be replaced = with a new PIII500. I would use the 286 as that should be sufficient. = Let me know what you find. Christian ----- Original Message -----=20 From: Braman Wing=20 To: diy_efi@xxx.org=20 Sent: Monday, February 28, 2000 12:04 PM Subject: cheap data aq system Someone posted a message a couple of days ago about looking for a = schematic for a cheap data aq system. I have found a schematic for a 11 = channel, 8-bit D-A system with a parallel port interface. It is based on = the Motorola MC145050. I got a 486 laptop on Ebay for $50, and the parts = were about $20. I am hoping to start prototyping it this week. Since I = have very little electronics experience, I expect it to be a challenge, = to say the least. however, if it works it will be great, since it is = very simple and cheap to build. If anyone is interested, please email me = and I will send the schematic and parts list. It would be great to have = someone else working on it who knows what they are doing! I have a = feeling the design can be improved upon, but I want to at least get it = working before I start messing with it too much. If there is any = interest and the thing is successful, I might try to have some PC boards = made up and do a group buy for the lists.=20 Braman - ------=_NextPart_000_0141_01BF81F2.AE6AB240 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I like how this might work.  I = already have=20 two laptops to use one is an old 286 and my current Pentium 200 which I = hope is=20 soon to be replaced with a new PIII500.  I would use the 286 as = that should=20 be sufficient.  Let me know what you find.
 
Christian
----- Original Message -----
From:=20 Braman = Wing=20
To:
Sent: Monday, February 28, 2000 = 12:04=20 PM
Subject: cheap data aq = system

Someone posted a message a couple of = days ago=20 about looking for a schematic for a cheap data aq system. I have found = a=20 schematic for a 11 channel, 8-bit D-A system with a parallel port = interface.=20 It is based on the Motorola MC145050. I got a 486 laptop on Ebay for = $50, and=20 the parts were about $20. I am hoping to start prototyping it this = week. Since=20 I have very little electronics experience, I expect it to be a = challenge,=20 to say the least. however, if it works it will be great, since it is = very=20 simple and cheap to build. If anyone is interested, please email me = and I will=20 send the schematic and parts list. It would be great to have someone = else=20 working on it who knows what they are doing! I have a feeling the = design can=20 be improved upon, but I want to at least get it working before I start = messing=20 with it too much. If there is any interest and the thing is = successful, I=20 might try to have some PC boards made up and do a group buy for the = lists.=20
 
Braman
 
 
- ------=_NextPart_000_0141_01BF81F2.AE6AB240-- - ---------------------------------------------------------------------------- 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, 28 Feb 2000 21:50:03 -0600 From: steve ravet Subject: Re: Another newbie and his project MysticZ wrote: > > I've been lurking for a while seeing what the group was like and decided > to open my mouth now. > > I'm slowly working on a fuel injection system for my 90 model Kawasaki > EX500. I'm planning to use a TBI batch fire type system. The engine is a > 2 cylinder 500cc parallel twin with a 180 degree firing order and dual > carbs. Unless I come up with a new plan I'm going to use throttle > position and RPM to look up entries on the fuel map. I also plan on > adding some programming to boost fuel when the throttle is opened > rapidly. I'd also like to use a higher than normal fuel pressure to help > atomize the fuel at higher RPM since the redline is 11,000. That's also > the reason for TBI instead of multi-port. I considered using a computer > from the smallest 4 cylinder I can find (Geo Storm or similar) with dual > injectors per cyl. Unfortunately the O2 sensor setup will be a > compromise as the header is over 50% of the entire length of the exhaust > and if I put the sensor in the collector it won't get hot enough to > work. Steve, I haven't seen any comments yet so I'll throw out a couple. First, use a heater O2 sensor and you don't have to worry about how far it is from the manifold. OBD-II cars have one after the cat and it works fine. You mention an alpha-N strategy (TPS vs RPM), and also a GM ecm. AFAIK there are no GM ECMs that use this strategy. I also think your upper RPM limit might be a problem for a car ECM. - -- Steve Ravet steve.ravet@xxx.com ARM,Inc. www.arm.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: Mon, 28 Feb 2000 21:33:37 -0800 (PST) From: Orin Subject: Re: cheap data aq system [Charset iso-8859-1 unsupported, filtering to ASCII...] > Someone posted a message a couple of days ago about looking for a schematic for a cheap data aq system. I have found a schematic for a 11 channel, 8-bit D-A system with a parallel port interface. It is based on the Motorola MC145050. I got a 486 laptop on Ebay for $50, and the parts were about $20. I am hoping to start prototyping it this week. Since I have very little electronics experience, I expect it to be a challenge, to say the least. however, if it works it will be great, since it is very simple and cheap to build. If anyone is interested, please email me and I will send the schematic and parts list. It would be great to have someone else working on it who knows what they are doing! I have a feeling the design can be improved upon, but I want to at least get it working before I start messing with it too much. If there is any interest and the thing is successful, I might try to have some PC boards made up and do a group buy for the lists. One problem with the '050 and its brother, the '051 is they hate more than 5V on the analog inputs. It causes errors in readings on all channels. Unfortunately, a simple resistor and zener isn't sufficient to cure this. What kind of protection is on the inputs in the schematic you found? Orin. - ---------------------------------------------------------------------------- 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, 29 Feb 2000 01:45:50 EST From: My57brd@xxx.com Subject: Re: Wire up an "A/F gage" w/o effecting existing control system? I am new to this site. Ihave a 57 tbird w a 96 camero LT1 motor and trans. Iused the stock eng wire loom.Removed all smog releted parts and wires. Also didn't use any of body control module or wiring. Hooked up Dakota inst panel, same cruise control, disk front brakes , firebird tilt column . Any one interested in the do's and don'ts I would be glad to give what ever info I can. I have one problem, my MIL lite comes on once in a while indicating low volts at bank 2 sensor 1 and 2 . Also a mas trouble code when I accelerate fast at all most any speed. No cat converts but installed O2 sensors in front of new turbo mufflers. The others are installed in manifold (stock). Any info would be welcomed MY57BIRD. Thankx - ---------------------------------------------------------------------------- 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, 29 Feb 2000 22:44:30 +1100 From: Peter Gargano Subject: Re: New files on FTP site Shannen, this info (you posted to DIY_EFI) is fantastic... Is there similar GM information available on the "Fast Start" DIS/DFI system? ftp://ftp.diy-efi.org/incoming/lt5dis_01.zip 1067389 Feb 28 01:14 ftp://ftp.diy-efi.org/incoming/lt5dis_01.zip 925458 Feb 28 01:09 Shannen Durphey wrote: > > Pictures of 93 LT5 DIS unit. 2 .zip files, about 2 meg total. If > you're interested in 8 cyl DIS, this might be good to see. > Shannen Thanks again, Peter Gargano - ---------------------------------------------------------------------------- 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 #78 **************************** 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".