[Gmecm] Adjusting 7730/$8D for larger cam

[Jay Vessels]

Hi there!

A heated 3-wire sensor (i.e. AFS-74) looks to the ECM like a single-wire 
part so no worries there.  You supply switched 12V and ground for the 
heater.  The signal wire connects to the ECM just like the single-wire 
one.  The heater is always powered with the ignition key on, so there's 
no worries about having to control the heater with the ECM.  I powered 
mine from the same circuit that powers my ignition coil, for instance. 
The heater isn't polarized, so it doesn't matter which wire is power and 
which is ground.

My local GM dealer had both the sensor and a pigtail harness for the 
3-wire plug in stock, so it was a quick, easy addition.

Jay Vessels
1982 Chevrolet S-10 Sport, 2.8V6 TBI
1984 Chevrolet S-10 Blazer Sport, 2.8V6 (TBI pending)

Clair Davis wrote:
> With regards to going to a heated (3+ wires) O2, is it simply a matter of
> running a power wire and ground wire, or is a 7730 capable of running one
> already?
> 
> Clair
> 
> 
> ----- Original Message ----- 
> From: "JohnsHome" <JohnsHome at wideopenwest.com>
> To: <gmecm at diy-efi.org>
> Sent: Saturday, February 03, 2007 3:59 PM
> Subject: RE: [Gmecm] Adjusting 7730/$8D for larger cam
> 
> 
>> Clair and Bill,
>> I'm up to around bin#75 myself :)  (many sub-versions of 0-F too for use
>> with the 16 switcher)
>> Don't forget you can copy the "****.log" file that TP makes each time you
>> change the bin.
>> Do a "save as.." first, then make the changes you want to try.
>> If you just make changes and then do "save as.." to make a new file and
> keep
>> the old one intact,
>> You won't get a log file.
>> Keep those with your versions and it will help to see what you did
> before...
>> Eventually when you have to start over (and you will, Its inevitable)
>> history can get you on the right path again.
>> you shouldn't need to rename your XDF unless you make a "definition" adder
>> or change that you want to be sure you use the most up to date file.
>> Too many files can be problematic too with multiple computers, but rev
>> numbers will help keep your sanity.
>> John
>>
>>> -----Original Message-----
>>> From: Bill Shaw [mailto:b.shaw at comcast.net]
>>> Sent: Saturday, February 03, 2007 9:38 AM
>>> To: gmecm at diy-efi.org
>>> Subject: Re: [Gmecm] Adjusting 7730/$8D for larger cam
>>>
>>>
>>> Hi Clair,
>>>
>>> Congrats on getting it running.  I save into a new file every time I
>>> save,  keeping a copy of every one I burn,  as well as a text file
>>> describing each and every single change in each version.  I'm up to
>>> mybbzb69.bin at the moment,  will probably go through a bunch more with
>>> the new engine.  Disk space is cheap.
>>>
>>> Bill
>>> 928s 5 sp. Vortech/749
>>>
>>> Clair Davis wrote:
>>>> John,
>>>> Question regarding the O2 constants you mentioned...
>>>>
>>>> In the Constants/Scalars section, I've got:
>>>> 0.60V at 496 (Idle O2 Rich/Lean Threshold Fast)
>>>> 0.60V at 497 (Idle O2 Rich/Lean Slow Zero Error Upper)
>>>> 0.56V at 498 (Idle O2 Rich/Lean Slow Zero Error Lower)
>>>>
>>>> Are you saying to knock them all down by 0.04 - to 0.54, 0.54,
>>> and 0.52?  I
>>>> haven't done that yet, but I can before I burn again.  I bumped the
> idle
>>>> spark advance at 800rpm up to 24.96* from 20.04* in the Closed
>>> Throttle vs.
>>>> RPM table.  That's the same as the 1200rpm point, not a big
>>> bump, and this
>>>> engine likes idle advance.
>>>>
>>>> With some luck, I'll get to try this out tomorrow, and see what
>>> the BLM's
>>>> look like as well.
>>>>
>>>> On a semi-related note, what are some thoughts on saving
>>> versions of bins to
>>>> help track progress?  I've got very few changes at this point,
>>> so I've been
>>>> keeping essentially a single file so far.  I can see how I'll
>>> need multiple
>>>> files in the very near future, and I'd like to keep up with
>>> what has been
>>>> changed.  I'm thinking date-stamp-type file names, but that can get
>>>> ungainly, and the XDF would have to be changed at the same
>>> time.  Maybe no
>>>> biggie, if I keep the date stamp in a directory name.  There
>>> must be some
>>>> tidier ways, though.
>>>>
>>>> Thanks again,
>>>>
>>>> Clair
>>>>
>>>
>>>
>> _______________________________________________
>> Gmecm mailing list
>> Gmecm at diy-efi.org
>> Subscribe: http://lists.diy-efi.org/mailman/listinfo/gmecm
>> Main WWW page: http://www.diy-efi.org/gmecm
>>
> 
> 
> _______________________________________________
> Gmecm mailing list
> Gmecm at diy-efi.org
> Subscribe: http://lists.diy-efi.org/mailman/listinfo/gmecm
> Main WWW page: http://www.diy-efi.org/gmecm
> 
> 
>