James42

And the purpose of the circuit is?

User 122821

Post #3. Basically tricks the ECU to see the O2 readings the ECU is expecting during the SAI cycle.
https://rennlist.com/forums/8853890-post3.html

User 122821

Yes, only one ground wire is required. I grounded mine to the chassis instead of the O2 sensor.

I'm running one cable with 2 twisted shielded wires to the other side. I ran it along the engine brace so it was only about 36 inches long.

jimbo3

There are six leads [ground (or is it power?) at 30 amp fuse(?), trigger at 87 post on relay, 4 O2 sensors (somewhere in some connectors?)] with two of the sensor leads going to the other side of the engine compartment? Wasn't picking up on that in the OP pictures. Seemed like there are 4 leads- ground (power?), trigger, and two to the sensor connectors immediately adjacent to fuse box.

Guess I'll to wait to receive one of these babies before becoming completely and hopelessly baffled about installing it...

Yes, I am an electrical dunce.

ilko

Got the package today Lewis, you're an electrical genius! The check is in the mail.

Thanks also to flying_low for putting this together.

Really appreciate what you guys have done!

Mercedesben

Can I get one with an enclosure for my dad's 96. I took it for a drive on Sunday and the cel popped on.
I'm glad I own a 95.
Thanks
Ben

NC TRACKRAT

Ditto to Lewis and Flying_Low! The amount of potential aggrevation and labor you guys have saved us is phenominal! Lewis, "The check is in the mail!"

Aircooled Dave

^^^^What he said. Amazing group of people on here. The check is in the mail!

mpgandco

Lewis
I also got mine in the mail and thanks to you and Flying Low.Flying Low is the one that orginally posted schematic of which Lewis made the circuit board from.

Here is my take on wiring of circuit board.There are 2 terminals on one side,being Blue and Gray.The other side has 8 terminals.4 being Black and other 4 are optional grey grounds.Flying Low or anybody else correct me if this is not correct.

1--- Hook Blue up to Sai Relay terminal

2--Hook Grey up to a good ground

3--- Hook 2 Black wires from other side of circuit board to the 2 Black wires on 02 Connection ,Drivers side.

4-- Hook other 2 Black wires from circuit box to the passenger side Black 02 sensor connection via a 36 inch shielded cable

Is this correct or do the other 4 grey terminals need to be grounded?Any input appreciated for us that are Electrically challenged

ltc

Each of the 4 two terminal blocks on the right side of the PCB has a single O2 sensor connection and an optional GND connection.

All 5 of the GND terminals (1each per the 4 mentioned above plus the one on the left side of the board) are identical. They are all the same connection on the PCB. Hooking up to one is the same as hooking up to another one.

You can run a single GND connection or you can run multiple GND connections. It depends on your O2 cable wiring choice. I designed it to support multiple types and wire gauges.
Also, since I didn't know how/where/in what orientation the board willbe mounted in and what type/size cable is used, I did not drill the plastic enclosures.

The board is a simple implementation of the schematic shown on post #1 of this thread. It can be hooked up exactly as flying_low did, or you can adapt your own wiring choice.

mpgandco

So Lewis if I understand you correctly,if I ground Grey wire on 2 terminal side of PCB the other 4 grounds on the other side of PCB will be automatically grounded?This would be ideal as you won't have to run any extra wires.Is this correct?

ltc

Yes. All 5 GND connections on the board (1 on left, 4 on right) are electrically connected to each other by the copper on the back side of the PCB.

There can be argument made for running twisted pair to each O2 sensor rather than just a single wire, as a twisted pair will have better noise immunity than a single wire.
Again, I designed the PCB to accommodate either choice.

As flying_low has demonstrated, a single wire to each O2 sensor works.

911Dave

I have a question regarding susceptibility to electrical interference with unshielded stranded copper wiring. All other things being equal, would a larger gauge be more or less susceptible to electrical interference than a smaller gauge? Or would there be no difference?

Ash

Moving this list to a new page to track easier

Added: added LAT, Mercedesben, scphelps1, aerocrosby, rbeggs to second round list.

This list for the first round of boards is now closed. I've started a Waiting/Back-up list below for those that missed this first run.

Quick reminders:
1) unless otherwise noted, it's assumed you are asking for an assembled unit.
2) enclosures are optional - feel free to update/ Post a reply/ PM and I'll update the list if you are looking for an enclosure.

Payment Info posted by Lewis (from post #147):
Once assembled, I will start sending PM's so folks can provide me their shipping addresses. Inside the package will be the unit, a hardcopy of the schematic, a hardcopy of the PCB layout and a return address envelope. When you get the unit and everything is OK, just use the envelope to send payment. I am a trusting person when it comes to RL members, so I have no problem sending out the units prior to receiving payment.

1. vincer77 - 1
2. Rick Lee - 1
3. Aircooled Dave - 1
4. michaelh993 - 2
5. tonypai - 1 + enclosure
6. fullbooker - 1 + enclosure
7. NP993 - 1 + enclosure
8. flying low - 4
9. ilko - 1 + enclosure
10. 600RR - 2 + 1 enclosure only
11. Shahrams - 2 + enclosures
12. bw993 - 1
13. tbil - 1 + enclosure
14. Teddy2 - 1 + enclosure
15. Ash - 1 + enclosure
16. 993BillW - 1 + enclosure
17. Dan V - 1 kit
18. efong - 1 + enclosure
19. AW21 - 2 + enclosures
20. NC TRACKRAT - 1 assembled + 1 kit + 2 enclosures
21. cabrio993 - 1
22. Paul M - 1 + enclosure
23. tropheus - 2 + enclosures
24. C4SJOHN - 2 + enclosures
25. MDamen - 1
26. TheBen - 1
27. JPS - 1
28. air993 - 1 + enclosure
29. alpinadvl - 1 + enclosure
30. rsa964 - 1
31. cdmdriver - 1
32. Jeff96-993 - 1 + enclosure
33. Kaefer - 2 + enclosures
34. SimonM_98 - 1
35. CarreraX - 2 + enclosures
36. skypig - 1 + enclosure
37. Don't lift - 1 + enclosure
38. 2ndof2 - 1
39. Richard W - 1 assembled + 1 kit + 1 enclosure
40. Amfab - 1 + enclosure
41. M Fig - 2
42. e3photo - 1
43. 911Dave - 1
44. kraftsman - 1 + enclosure
45. PNogC2S - 1
46. CAHRERA - 1
47. slapshot - 1 + enclosure
48. bpras@msn.com - 2
49. Blue TTop - 2 + enclosures
50. rdevany - 1 kit + 1 enclosure
51. earossi - 1 + enclosure
52. sdrake - 1
53. cmat - 1 kit + enclosure
54. Teddy2 - 1 + enclosure
55. jaguarandi - 1 + enclosure
56. Biggdawg - 2 + enclosures
57. mike cap - 1 + enclosure
58. deekay911 - 1 + enclosure
59. helmet993 - 1 + enclosure
60. ppressle - 1 kit
61. southsong - 1 + enclosure
62. V33 - 2 + enclosures
63. nels415 - 1 + enclosure
64. vr416v - 1 + enclosure
65. Don Plumley - 1
66. Matt Lane -1 + enclosure
67. Jim W - 1 + enclosure
68. TxnBluDvl - 2 + enclosures
69. mpgandco - 2 + enclosures
70. GRINBOB - 1 kit + 1 enclosure
71. beagling - 1 + enclosure
72. Jscanavan - 2 kits + 2 enclosures
73. Richard Lee - 1 + enclosure
74. dbog - 1 + enclosure
75. bootman30 - 1
76. 77'3.6vram - 3 + enclosures

Backup/Waiting/2nd Round List

1. DryFly - 1 + enclosure
2. ESL - 1 + enclosure
3. timothymoffat - 2 + enclosures
4. suffi - 1 kit
5. tom97c4s - 2 + enclosures
6. lizSter - 1 + enclosure
7. SCMomentum - 2 + enclosures
8. elfefan - 1 + enclosure
9. deadeye - 2 + enclosures
10. FisterD - 4 + enclosures
11. rc16 - 2 + enclosures
12. tbrom - 1 + enclosure - Please Confirm
13. jimbo3 - 2 + enclosures
14. skl2 - 2 + enclosures
15. mikej - 2 + enclosures
16. GC96 - 1 + enclosure
17. Cincy_Ron - 1 kit + enclosure
18. coreseller - 1 + enclosure
19. boostid - 1 + enclosure
20. GD993C4 - 1 + enclosure
21. Howdy993 - 1 + enclosure
22. Mike J - 1 + enclosure
23. 996Carrera - 1 + enclosure
24. markc123 - 2 + enclosures
25. LAT - 2 + enclosures
26. Mercedesben - 1 + enclosure
27. scphelps1 - 1+ enclosure
28. aerocrosby - 2 + enclosures
29. rbeggs - 1 + enclosure

Ash

Just got back home from a business trip to find the package waiting. Thanks again Lewis...check is going out tomorrow first thing.

Much gratitude to your wife for helping out...it's a lot of work.

Cheers!