1.6 TPS mod - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 03-11-2008, 10:33 AM   #1
Newb
Thread Starter
 
Join Date: Sep 2007
Posts: 34
Total Cats: 0
Default 1.6 TPS mod

I've found the bmw throttle position sensor but it didn't have a connector with it. I'll be trying to find a connector for it today at a local salvage yard but in the case that I don't I was wondering if it was possible to connect a 93 auto tps sensor to a 93 5 speed throttle body. I'm assuming it's not a direct swap and that I'd have to drill into the 5 speed throttle body or replace the whole thing with an automatic throttle body. Just wondering though.
racerx is offline   Reply With Quote
Old 03-11-2008, 11:38 AM   #2
Junior Member
 
Join Date: Jan 2007
Posts: 188
Total Cats: 0
Default

richard_ha is offline   Reply With Quote
Old 03-11-2008, 12:19 PM   #3
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

I started to mess with a variable tps transplant. I have a tps from a 95 KL V6 626 which would bolt up using a large O-ring as a spacer since the bolt holes line up, but the damn thing rotates the wrong way. That said, the last gen protege appears to have the same TPS but it rotates the other way - so that might be a cheap alternative. The only thing that would need to be resolved is the "keying" of the tps to the TB shaft.
m2cupcar is offline   Reply With Quote
Old 03-11-2008, 03:12 PM   #4
Junior Member
iTrader: (9)
 
Join Date: Apr 2007
Location: Hanover, MA
Posts: 237
Total Cats: 0
Default

A little off topic but I was at the junk yard the other day and found a 323 with an automatic. The throttle body looked a lot like the automatic miata one except it had a smaller throttle plate. Has anyone tried removing the throttle shaft from the 323 and putting it in a miata throttle body? Then just reuse the miata throttle plate and bolt on the TPS. Would this work?
Pseudosport is offline   Reply With Quote
Old 03-11-2008, 09:03 PM   #5
Newb
 
Join Date: Dec 2007
Location: UK
Posts: 23
Total Cats: 0
Default

I've also got the BMW TPS without the connector on it. Being a bit creative with crimped connectors, I was able to attach electric wires which I plan on connecting to the stock harness (using flat crimped connectors).

I doesn't look perfect, but the connections feel sturdy... It's also possible to solder wires as an alternative
Eiffel is offline   Reply With Quote
Old 03-12-2008, 09:53 PM   #6
Newb
Thread Starter
 
Join Date: Sep 2007
Posts: 34
Total Cats: 0
Default

I've thought about doing that too, but how do you know which pins are which? I know in another thread their labeled by pin number but there aren't any numbers on the unit that I have.
racerx is offline   Reply With Quote
Old 03-12-2008, 11:19 PM   #7
Elite Member
iTrader: (5)
 
Atlanta93LE's Avatar
 
Join Date: Sep 2006
Location: Marietta, GA
Posts: 2,198
Total Cats: 1
Default

Pin 1-black wire-5volt in
Pin 2-shielded wire-ground
Pin 3-yellow wire-signal out
Pin 4-ground
Pin 5-WOT switch
Pin 6-Closed switch

See diagram below for pin locations relative to center "T"

Code:
 6 1
5 T 2
 4 3
Ben, feel free to add [code] tags around the diagram in your post in the MS FAQ sticky to clarify the diagram
Atlanta93LE is offline   Reply With Quote
Old 03-13-2008, 04:23 AM   #8
Newb
Thread Starter
 
Join Date: Sep 2007
Posts: 34
Total Cats: 0
Default

OK, that makes perfect sense. the post I was looking at from Ben was a little different. Also I've actually been searching all over the forum for this as well, I know that the stock sensor on my car has a red wire, a green wire, and a black-light green wire. I've only seen write-ups on here for other tps sensors that have those colors for wires. Which pin goes to which wire exactly?
racerx is offline   Reply With Quote
Old 03-13-2008, 04:48 AM   #9
Newb
Thread Starter
 
Join Date: Sep 2007
Posts: 34
Total Cats: 0
Default

I'm guessing that the red wire goes to pin 1, the black wire goes to pin 2, and the black-light green wire goes to pin 3. Would this be correct? I don't have the wiring diagrams here so it's just a guess.
racerx is offline   Reply With Quote
Old 03-13-2008, 09:11 AM   #10
Elite Member
iTrader: (5)
 
Atlanta93LE's Avatar
 
Join Date: Sep 2006
Location: Marietta, GA
Posts: 2,198
Total Cats: 1
Default

I can't remember the colors on the stock wires. You can take a look at the wiring diagrams here, but I don't remember anything being non-intuitive.
Atlanta93LE is offline   Reply With Quote
Old 03-13-2008, 09:59 AM   #11
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

Has anybody tried the TB from an auto Protege LX, Escort GT or Tracer LTS? They all have variable TPS, the TB looks exactly the same (all BP engines) and they're dirt cheap. I was going this route but apparently the 1.6 MkII link doesn't use variable tps input.
m2cupcar is offline   Reply With Quote
Old 03-13-2008, 10:31 AM   #12
Elite Member
iTrader: (5)
 
Atlanta93LE's Avatar
 
Join Date: Sep 2006
Location: Marietta, GA
Posts: 2,198
Total Cats: 1
Default

Quote:
Originally Posted by m2cupcar View Post
Has anybody tried the TB from an auto Protege LX, Escort GT or Tracer LTS? They all have variable TPS, the TB looks exactly the same (all BP engines) and they're dirt cheap. I was going this route but apparently the 1.6 MkII link doesn't use variable tps input.
I was looking into this option before I did my bmw tps doo-dad, but never could get a straight answer about whether they were a variable TPS or not. It ended up being easier to order the bmw tps than it was to find time to get to the scrap yard.
Atlanta93LE is offline   Reply With Quote
Old 03-13-2008, 01:21 PM   #13
Supporting Vendor
 
Matt Cramer's Avatar
 
Join Date: Sep 2006
Posts: 2,264
Total Cats: 51
Default

Quote:
Originally Posted by Atlanta93LE View Post
I was looking into this option before I did my bmw tps doo-dad, but never could get a straight answer about whether they were a variable TPS or not.
They are.
Matt Cramer is offline   Reply With Quote
Old 03-13-2008, 08:21 PM   #14
Newb
 
Join Date: Dec 2007
Location: UK
Posts: 23
Total Cats: 0
Default

Quote:
Originally Posted by racerx View Post
I'm guessing that the red wire goes to pin 1, the black wire goes to pin 2, and the black-light green wire goes to pin 3. Would this be correct? I don't have the wiring diagrams here so it's just a guess.
This is how I wired mine... so it must be correct
Eiffel is offline   Reply With Quote
Old 03-13-2008, 11:09 PM   #15
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

Yep - protege guy in the MS forum is using an auto protege LX TB and variable tps. The only thing that "appears" different are which way the "tubes" are pointing - nothing the right hose couldn't fix. For <$40 for the complete TB, it seems to be a good solution.
m2cupcar is offline   Reply With Quote
Old 03-17-2008, 01:14 PM   #16
Newb
Thread Starter
 
Join Date: Sep 2007
Posts: 34
Total Cats: 0
Default

Got the megasquirt/tps sensor installed. The bmw tps sensor was truly a direct swap. I juryrigged some sockets for pins 1-3 and took off the old sensor and put the new one on and screwed the little bolts back in. Red wire to pin #1, black-lime wire to pin #2, and Lime-white wire to pin #3. Megasquirt still needs adjusting though, but tps works perfectly.
racerx is offline   Reply With Quote
Old 03-17-2008, 04:07 PM   #17
Senior Member
iTrader: (1)
 
miataspeed1point6's Avatar
 
Join Date: Feb 2006
Location: Detroit
Posts: 1,235
Total Cats: 0
Default

So any auto BP car (escort gt, protoge etc.) has a easy swap variable one? Thats good news, my local u-pull-it has hundereds of those cars.
miataspeed1point6 is offline   Reply With Quote
Old 03-17-2008, 04:38 PM   #18
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

no. Auto BPs have an entire TB with TPS that is believed to be swappable. I don't think anybody has tried it. But there are several on car-part.com for <$40 for the entire assembly (TB, TPS and IAC).
m2cupcar is offline   Reply With Quote
Old 03-18-2008, 09:12 PM   #19
Senior Member
iTrader: (1)
 
miataspeed1point6's Avatar
 
Join Date: Feb 2006
Location: Detroit
Posts: 1,235
Total Cats: 0
Default

Sometime this week or next week I plan to go to the u-pull-it. What should I look for?

-Pulling counter clockwise and backward
-Correct bolt pattern
-Connection to TB plate

Anything else? Should I check the whole TB or just the sensor? Should be easy enough to check.
miataspeed1point6 is offline   Reply With Quote
Old 03-20-2008, 10:52 PM   #20
Senior Member
 
Join Date: Dec 2004
Location: Brisbane, Australia
Posts: 1,272
Total Cats: 32
Default

I'd try a bit harder to find the Bimmer one. Speaking from experience, it makes things so simple.
timk is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1994 Spec Miata Race Car SM/SM2/SSM For Sale Quinn Cars for sale/trade 6 10-23-2016 08:58 AM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 PM
VR6 to Miata Swap ScrapinMX5 Meet and Greet 8 09-28-2015 02:04 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 12:28 AM.