Another TPS Option for 90-93MT: TPS4185 - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 08-29-2015, 02:45 AM   #21
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Ok, so hopefully if someone else is going to do this internal mod they read far enough to see that I screwed up and mislabeled the original picture leading Brainack to give the wrong wiring instructions.





Here are the correct labels and wiring to work with the stock harness. This time I actually double checked the outputs with the multimeter and verified against the info Brainack quoted.
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Another TPS Option for 90-93MT:  TPS4185-80-image_063ae89d55dcaca4d35cf817b3e72ba8b54a65e0.jpg  
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Old 08-29-2015, 08:05 AM   #22
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:P
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Old 09-17-2015, 03:31 PM   #23
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This is awesome. Thank you!
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Old 05-23-2016, 10:37 AM   #24
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My apologies for bringing this thread back from the dead, just curious if the OEM 90-93 engine harness TPS connector can be re-pinned to function correctly without the need to cut open the TPS and solder inside of it. I am thinking just swap wire position 1 and 2 and be done with it on the TPS connector.

Anyone know if this will work?
Thanks!
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Old 05-23-2016, 12:00 PM   #25
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Quote:
Originally Posted by Rasta420 View Post
My apologies for bringing this thread back from the dead, just curious if the OEM 90-93 engine harness TPS connector can be re-pinned to function correctly without the need to cut open the TPS and solder inside of it. I am thinking just swap wire position 1 and 2 and be done with it on the TPS connector.

Anyone know if this will work?
Thanks!
That's the way a normally sane person would do it. The reason I went through the trouble of rewiring it was so it was fully reversible every 2 years when I have to take it in and get it smogged.

Between this, the intercooler, bigger injectors, etc., the list of things to switch out every 2 years is getting longer!
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Old 05-23-2016, 06:08 PM   #26
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Thanks!

Searching now to see if anyone has a how to for de-pinning that connector, not having much luck yet...

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Old 05-23-2016, 06:36 PM   #27
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As much as I hate altering the OEM harness, I just cut and swapped the two wires in the harness. Bit of solder and shrink wrap and everything is happy.
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Old 05-24-2016, 12:12 AM   #28
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Quote:
Originally Posted by hornetball View Post
As much as I hate altering the OEM harness, I just cut and swapped the two wires in the harness. Bit of solder and shrink wrap and everything is happy.
^ No more invasive than depinning the connector and probably a lot faster and easier if you are going to permanently alter things.
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Old 05-25-2016, 09:47 AM   #29
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As a follow up, I ended up trying for about two hours with jewelers screwdrivers to de-pin the TPS connector, couldn't get it to budge, I just cut 1 &2 and soldered them together and put on some shrink wrap tubing, wrapped in 3M electrical tape, plugged it in , for the base plate I used flat aluminum and a few small flat head washers stacked on top of each other to act as bushings between the TPS and the base plate, with a small bolt/lock washer and nut combination to hold it in place. works flawlessly.

Duralast Part Number TPS4185 - $53.99

It took about 30 minutes excluding the failed attempt at DE-pining the connector.
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Old 08-22-2016, 07:16 PM   #30
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Sorry to bring this back from the dead but I wanted to mention I recently used a TPS4158 on my '91. I did the internal mod. Dremeled the top off and resoldered the pins to match the Miata harness and hot glued the top back on. I previously had a TPS201 and in my experience, this is significantly less noisy.
Wells TPS4185 internal mod

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