DIY_EFI Digest Monday, 9 June 1997 Volume 02 : Number 195 In this issue: Re: 02 sensor mounting Re: vacuum with blower Diy_Efi for '49-53 Ford Flathead Re: Nissan 300 ZX RE: vacuum with blower RE: hc11 Efi Code See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- From: dzorde@xxx.com (dzorde) Date: Sun, 8 Jun 1997 06:21:13 -0700 (PDT) Subject: Re: 02 sensor mounting Sure you can weld on it, you just need the old arc welder (or stick welder), you can't use a mig or bronze. Dan dzorde@xxx.com > >Thanks to everyone who replied on my O2 sensor mounting problem. >I like the anti-fouler idea, I think I might try that. > Removed other part > >Greg Woods >gwoods@xxx.com >austin, tx > > >----------geoboundary-- > ------------------------------ From: jpearl@xxx.com Date: Sun, 8 Jun 1997 13:56:03 -0400 Subject: Re: vacuum with blower >> someone please tell me how a turbo/super-charged system >> gets vacuum for the vac-assisted brakes and other vac- >> operated accessories ? Is the vacuum that is produced >> during idle and decel stored and used? My knowledge >> of SC and TC systems is limited. >There is a check valve in the brake booster to prevent pressure from entering the booster on many cars. Under boost >you loose all effects of the brake booster as there is no vacuum to draw from. Unless you drive with your foot on the >brake at full boost, you are not likely to ever experience this. As soon as you let off the gas pedal, you have >instant vacuum to power your brake booster. My $.02 - my car has NO such "checkvalve" and no special considerations were made concerning boost and it's effect on the brakes. It's a Twin Turbo 5.0 (was actually) and I too wondered abut the effects I'd receive under boost. Simply put - the pedal pushed BACK at me when under boost and braking! Most of the boosted cars out there probably don't have this problem (say a Vortech car) but with a turbo I could place my fot on the brakes (hard) and floor it and get enough boost for the pedal to rise despite my foot being jammed against it. Was rather disconcerting but since I seldom did this (datalogging my DFI) it was never an issue. As others noted, when you want brakes you don't often have your foot on the gas! (grin) Was kind of interesting to get up to about 25-30 mph with my foot hard on the brakes and have the tires begin to spin as I came up on boost! jvp@xxx.com ------------------------------ From: "Robert G. Stewart" Date: Sun, 8 Jun 1997 21:01:16 -0400 Subject: Diy_Efi for '49-53 Ford Flathead Hello Fellow Gearheads!! I'm thinking of starting a project in the future (only limited by time & $$$$ - the usual stuff!). I plan on using a Ford Flathead of the '49-53 vintage for a nostalgia type street rod type vehicle. Too stick with the 50's look I plan on using dial throttle body injections pods on a intake manafold designed for 2 2 brl carbs. I am familiar with the GM cross fire injection system of the early eighties - and plan on using this set-up and compter as a start, only I plan to use the injection pods from two 1.8 L Pontiac Sunbirds instead of the throttle bodies off of the cross fire injection as it was intended for a 5.0L V-8, and my displacement is approx 3.9L. I would use all other sensors and the dist. in this tranfer. I also have access to an OCD scan tool. What do you guys think of the feasibility???? Please email me back, and/or add me to your list of subscribers. I have a degree in electronics, work as a mechanical designer, and grew up around my dad's auto repair shop - so I can talk your language as well as handle the tools. Thanks Bob Stewart rstewart@xxx.com ------------------------------ From: Frank Swygert Date: Sun, 08 Jun 1997 21:13:19 -0400 Subject: Re: Nissan 300 ZX Orin Eman wrote: > > > The 63xxx processors are Hitachi manufactured clones of Motorola 68xxx > > parts. > I have an Excel spreadsheet for the opcodes of the 6303. I was under the > impression that it isn't the same as the 6803 and has some extra instructions > too. > > Orin. Okay, I know for sure about the 6809. It is possible that Hitachi got permission to add the extra instructions and registers to the 6303, or it could be the same as the 6309... "undocumented but there", and UNSUPPORTED by Motorola or Hitachi... officially. Where did you get the opcodes? If you got them from an official source (Moto or Hitachi), then there was obviously some agreement between the companies. All I can say is that the 63xx series is supposed to be 100% compatible with the 68xx series. The 6309, for instance, has a "compatible mode", which is active when the processor is first powered up, and a "native" mode, which must be selected through a special instruction. I'm a hardware man, not a programmer, but I can find the info if someone needs it. ------------------------------ From: Geoff Watts Date: Mon, 9 Jun 1997 09:27:01 -0000 Subject: RE: vacuum with blower What if you got a stuck throttle? - i'd go and put some 1-way valves in geoff - -----Original Message----- From: jpearl@xxx.com] Sent: Sunday, June 08, 1997 5:56 PM To: diy_efi@xxx.edu Subject: Re: vacuum with blower >There is a check valve in the brake booster to prevent pressure from entering the booster on many cars. Under boost >you loose all effects of the brake booster as there is no vacuum to draw from. Unless you drive with your foot on the >brake at full boost, you are not likely to ever experience this. As soon as you let off the gas pedal, you have >instant vacuum to power your brake booster. My $.02 - my car has NO such "checkvalve" and no special considerations were made concerning boost and it's effect on the brakes. ------------------------------ From: Kevin Timmerman Date: Mon, 9 Jun 1997 00:55:51 -0400 Subject: RE: hc11 Efi Code I have hex files and disassembly of a few HC11 EFI systems available at http://www.macatawa.org/~opossum/digifant/index.htm . They are based on the 68HC11A1 and 68HC11G5 parts. The first file listed has some commenting, some commented routines are: Table lookup - 1D and 2D, simple and interpolated Stroke time to RPM index conversion Interrupt driven EEPROM writing Linear / log conversion Fault code stuff On Friday, May 30, 1997 9:17 AM, mike costa [SMTP:mcosta@xxx.com] wrote: > Hello All, > > I'm new to the list, but I'm working on an efi computer project for a > friend of mine's four banger and i'm looking for some sample hc11 code. > Whether it be a manufacture's commented code from a hacked ecu or > someone's code from a personal project. Any help would be appreciated. > Thanks > > Mike Costa ------------------------------ End of DIY_EFI Digest V2 #195 ***************************** 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".