DIY_EFI Digest Tuesday, 19 August 1997 Volume 02 : Number 280 In this issue: 80c535 (8051 Software) Re: TPI Questions Re: 80c535 (8051 Software) O2 sensor thread Re: O2 sensor thread RE: O2 sensor thread Re: O2 sensor thread Re: O2 sensor thread Re: O2 sensor thread Re: O2 sensor thread See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- From: dusher@xxx.com Date: Mon, 18 Aug 1997 11:38:59 BST Subject: 80c535 (8051 Software) Hi All, Does any know where i can get some Efi software for 80c535/8051 OR any that works on a PC!, If you could E-mail me "direct" at dave@xxx. bye Dave - -- ------------------------------ From: dzorde@xxx.com (dzorde) Date: Mon, 18 Aug 1997 06:33:54 -0700 (PDT) Subject: Re: TPI Questions George, 6 deg is not bad on 87 octane, on leaded (96 octane) I can't run anymore than 3 deg (allowing for small safety margin) without the engine starting to ping (well, sound like a machine gun). With the avgas (BP100) I can safely run 6 deg. Mind you I'm not using the standard ecu, so there's no knock sensing or retard facility, hence it's critical that I leave a safety margin as well. However, I had come to the conclusion the pinging was mainly due to the extremely high compression the engine has (between 220psi and 240psi per cylinder). In fact, I can run 10 deg static if I don't load the engine heavily, ie. stay below 2500rpm in all gears. Which is fine for city driving (less than 80kph), but you can't put your foot down at all. Dan dzorde@xxx.au >Hi Dan, what were you able to set the timing too without getting excessive >detonation? I could only getabout 6 degrees with my egr plugged. > >GMD > > >At 06:10 AM 8/12/97 -0700, you wrote: >>I'm lost, for a performance engine, do you want egr or not ? When I built >>my tpi 350, I pulled the egr valve and stuck a blanking plate over the hole >>instead, oh, I also put the little metal plates in the manifold gaskets >>where the egr is meant to breathe through. Was this a mistake (I don't care >>about economy, only power)? >> >>Dan dzorde@xxx.com >>>> Thanks for the help. >>>> >>>> This P/N thing is confusing. I have the JTR book (and a bunch others) >>>and >>>> most say not to ground this pin. >>>> If I remember correctly something to do with idle and deceleration. >>>Should >>>> I be concerned???? >>>> I think a lot of this is tied to an automatic transmission, not manual. >>>Is >>>> this true? >>> >>>I left mine open..sortta. I'm using Aluminum Corvette heads that do not >>>have the internal EGR passages in combination with a '86 VIN "F" TPI >>>manifold. >>> >>>The EGR valve is still present and connected, but doesn't actually do >>>anything since there isn't a supply of exhaust gas to the valve. >>> >>>Grounding the EGR feedback wire will set off the SES light (it simulates >>>the EGR being stuck in the open position) >>> >>>Leaving it disconnected will also occasionally set off the SES light (there >>>are a few cases where the ECM will command the EGR to actuate, then look to >>>see what happened.) Fortunately, temps down here are high enough that this >>>doesn't happen often. (been about 4 months since the last time the code >>>went off) It will also clear itself within a few minutes of driving. >>> >>>Someday I'll have an EGR flange welded to one of the exhaust headers to >>>supply external EGR.. but it's a low priority. >>> >>>Curt Martin (cmartin@xxx.com) >>>Ormond Beach, FL >>>http://www.america.com/~cmartin >>>'87 350 TPI Camaro.. (used to be a 2.8L V6 :) >>> >> >> >> >George M. Dailey >gmd@xxx.com > > ------------------------------ From: Land Shark Date: Mon, 18 Aug 1997 09:20:12 -0600 Subject: Re: 80c535 (8051 Software) At 11:38 AM 8/18/97 BST, you wrote: >Hi All, Does any know where i can get some Efi software for 80c535/8051 OR any that works on a PC!, If you could E-mail me "direct" at dave@xxx. bye Dave Yeah.. try Robert Bosch GmBH... *grin* The 80C535/515 was used for the majority of their Motronic EFI units from 1988-1991 Jim ------------------------------ From: "Bob Huish" Date: Mon, 18 Aug 1997 08:46:32 -0800 Subject: O2 sensor thread The welder installed my O2 sensor adaptor but buggered up the first couple of threads. I will re-tap as soon a someone can tell me what size tape to use......Help Bob Cuda-65 - Angels Camp, Calif. cudabob@xxx.com http://www.goldrush.com/~rhuish/ ------------------------------ From: Michael Manry Date: Mon, 18 Aug 1997 09:49:00 -0700 (PDT) Subject: Re: O2 sensor thread The thread is 18 x 1.5 mm. I had to go to a tool & die shop to find a tap and it was $32.00. Hope it Helps Mike M. On Mon, 18 Aug 1997, Bob Huish wrote: > The welder installed my O2 sensor adaptor but buggered up the > first couple of threads. I will re-tap as soon a someone can tell me > what size tape to use......Help > Bob Cuda-65 - Angels Camp, Calif. > cudabob@xxx.com > http://www.goldrush.com/~rhuish/ > ------------------------------ From: James Boughton Date: Mon, 18 Aug 1997 13:16:20 -0400 Subject: RE: O2 sensor thread I assume you meant tap and not tape? Anyhow, the O2 sensor thread is an M18x1.5 thread. Jim Boughton boughton@xxx.net - ---------- From: Bob Huish[SMTP:rhuish@xxx.com] Sent: Monday, August 18, 1997 12:46 PM To: diy_efi@xxx.edu Subject: O2 sensor thread The welder installed my O2 sensor adaptor but buggered up the first couple of threads. I will re-tap as soon a someone can tell me what size tape to use......Help Bob Cuda-65 - Angels Camp, Calif. cudabob@xxx.com http://www.goldrush.com/~rhuish/ ------------------------------ From: George Najarian Date: Mon, 18 Aug 1997 10:29:01 -0700 Subject: Re: O2 sensor thread Spark plugs have the same thread/pitch. You can use a spark plug thread tap, which should cost much less. At 09:49 AM 8/18/97 -0700, Michael Manry wrote: >The thread is 18 x 1.5 mm. I had to go to a tool & die shop to find a tap >and it was $32.00. >Hope it Helps > >Mike M. > >On Mon, 18 Aug 1997, Bob Huish wrote: > >> The welder installed my O2 sensor adaptor but buggered up the >> first couple of threads. I will re-tap as soon a someone can tell me >> what size tape to use......Help >> Bob Cuda-65 - Angels Camp, Calif. >> cudabob@xxx.com >> http://www.goldrush.com/~rhuish/ >> > > George Najarian | '95 Ford Mustang GTS Cobra (14.07/100.81) najay@xxx.0/92) http://www.najay.com/ Team.Net (Solo II E/SP) Najay Engineering - Custom EEC reprogramming service available. ------------------------------ From: Tom Cloud Date: Mon, 18 Aug 1997 13:18:21 -0500 Subject: Re: O2 sensor thread >The welder installed my O2 sensor adaptor but buggered up the >first couple of threads. I will re-tap as soon a someone can tell me same as old-style 18 mm spark plugs -- use a plug tap or take an old plug and make a tap out of it -- taper the first couple of threads so it'll fit into the bung easier. Then cut a notch (look at a tap or re-threader)) with some relief on the forward (CW) side. The metal on the plug isn't hardened like a "real" tap, so you won't be able to use it more than once or twice, but you can make re-threading taps out of existing items fairly easy this way. When grinding the first few threads, don't use a grinder or file as they leave a burr and will make it more difficult to get the "tap" started -- use a belt or disc sander. If you must use a grinder, you'll probably have to take a jeweler's file or a "threading" file to clean up the threads (Sears used to sell the "threading" file -- it's a file with teeth cut on the standard thread pitches .... come to think of it, it's cut in tpi so it's not metric ... oh, well) Tom Cloud The gene pool could use a little chlorine !! ------------------------------ From: Ken Mayer Date: Mon, 18 Aug 1997 17:41:51 -0400 (EDT) Subject: Re: O2 sensor thread [snip] > the "tap" started -- use a belt or disc sander. If you must > use a grinder, you'll probably have to take a jeweler's file > or a "threading" file to clean up the threads (Sears used > to sell the "threading" file -- it's a file with teeth cut > on the standard thread pitches .... come to think of it, it's > cut in tpi so it's not metric ... oh, well) Thread files are available in metric and sae sizes. My local auto parts store has them on the "KD" display board. I've seen them in other brands too. Each file is a square cross-section and has 8 different pitch thread sizes. It just takes a steady hand to use them correctly. Ken :-) ------------------------------ From: Doug Robson Date: Tue, 19 Aug 1997 12:44:16 +1000 Subject: Re: O2 sensor thread usually 18 x 1.5 mm At 08:46 AM 8/18/97 -0800, you wrote: >The welder installed my O2 sensor adaptor but buggered up the >first couple of threads. I will re-tap as soon a someone can tell me >what size tape to use......Help >Bob Cuda-65 - Angels Camp, Calif. >cudabob@xxx.com >http://www.goldrush.com/~rhuish/ > > Mail me at mailto:doug@xxx.au <---------------- - - - - - - - -> or visit http://www.cia.com.au/doug or maybe take yourself to http://www.clubcars.org.au | When I die I want to go peacefully like my Grandfather not Screaming like the passengers in his car ------------------------------ End of DIY_EFI Digest V2 #280 ***************************** 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".