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Recap of the SAI circuit

Old 09-15-2011, 02:27 AM
  #46  
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Despite being responsible for every problem in every early CS, Lewis is great. Take that PCNA!
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Old 09-15-2011, 02:31 AM
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"does this enables us to physically remove the SAI system from our cars, including the OBDII ones,"

No! All it does is fool/mis-represent what the O2 sensors 'see' when the
SAI air pump turns 'on', i.e. It basically indicates that an adequate amount
of air is reaching the O2 sensors during a cold start-up.
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Old 09-15-2011, 02:52 AM
  #48  
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Originally Posted by Lorenfb View Post
No! All it does is fool/mis-represent what the O2 sensors 'see' when the SAI air pump turns 'on', i.e. It basically indicates that an adequate amount of air is reaching the O2 sensors during a cold start-up.
Why does that mean we can't remove the SAI pump and system from our cars? What am I not understanding here?
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Old 09-15-2011, 02:58 AM
  #49  
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Count me in for one! Thanks Lewis. I think I still have an old Heathkit voltmeter from about 1970 that my brother built.
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Old 09-15-2011, 03:18 AM
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Wherever the "formal" list ends up for sign up, I'm on it. Never know when one may need one.

Thank you Lewis!
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Old 09-15-2011, 03:31 AM
  #51  
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Originally Posted by Lorenfb View Post
"does this enables us to physically remove the SAI system from our cars, including the OBDII ones,"

No! All it does is fool/mis-represent what the O2 sensors 'see' when the
SAI air pump turns 'on', i.e. It basically indicates that an adequate amount
of air is reaching the O2 sensors during a cold start-up.
I don't see why not. My pump is disconnected. The SAI pump relay is still in place to show a load across the relay. I agree this is not a complete OBDII bypass, just the SAI portion.
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Old 09-15-2011, 03:38 AM
  #52  
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Originally Posted by ltc View Post

So, this weekend should be schematic capture, library work and PCB layout.

I will source all the components from DigiKey and the PCB from Advanced Circuits, so there will be full visibility into the parts cost.
This is awesome Lewis! Thanks for taking this to the next level.
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Old 09-15-2011, 10:21 AM
  #53  
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Please put me down for 1 ea. assembled and 1 ea. kit. TIA! You da man!

p.s.: Still have my Heathkit strobe light and CO meter (analog...nowhere near accurate enough for today's cars.) Built many kits when I was a teenager.

Last edited by NC TRACKRAT; 09-15-2011 at 06:11 PM.
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Old 09-15-2011, 10:56 AM
  #54  
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Great post and Rennlist spirit! I don't have any SAI issues, but I will also like to sign up for one please!
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Old 09-15-2011, 10:58 AM
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What happened with Post #1 that Flying_low posted with the schematics and pictures? I could see it yesterday but it has dissapeared now...
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Old 09-15-2011, 01:12 PM
  #56  
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Originally Posted by cabrio993 View Post
What happened with Post #1 that Flying_low posted with the schematics and pictures? I could see it yesterday but it has dissapeared now...
That's weird. If it doesn't re-appear I'll create a web page on my server for the details.
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Old 09-15-2011, 01:14 PM
  #57  
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Originally Posted by cabrio993 View Post
What happened with Post #1 that Flying_low posted with the schematics and pictures? I could see it yesterday but it has dissapeared now...
Originally Posted by flying_low View Post
That's weird. If it doesn't re-appear I'll create a web page on my server for the details.
We made a small error and moved the posts in the DIY section.
I will try to fix it now.
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Old 09-15-2011, 01:16 PM
  #58  
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Ok fixed.
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Old 09-15-2011, 01:28 PM
  #59  
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I would like one too.
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Old 09-15-2011, 01:52 PM
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"Why does that mean we can't remove the SAI pump and system from our cars?"

Yes, you could remove just the pump, but why? When you remove system
components, it no longer looks stock, i.e. A possible future sale or an
overly committed emissions inspector/tester.
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