Variable TPS - 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 05-02-2013, 08:33 AM   #1
Senior Member
Thread Starter
 
Join Date: Nov 2007
Location: Belgium
Posts: 940
Total Cats: 59
Default Variable TPS

I needed to install one the other day, so I collected some info on the subject and put it online on my site.

Variable TPS | Frank's Westfield MX5 Variable TPS | & Megasquirt site
WestfieldMX5 is offline   Reply With Quote
Old 05-02-2013, 01:00 PM   #2
Senior Member
 
Join Date: Mar 2006
Location: Schwarzenberg, Germany
Posts: 1,497
Total Cats: 81
Default

Nice as usual... I even gave you a positive prop...
Zaphod is offline   Reply With Quote
Old 05-02-2013, 01:02 PM   #3
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,908
Total Cats: 1,793
Default

good info; thanks!
Braineack is offline   Reply With Quote
Old 05-02-2013, 01:05 PM   #4
Senior Member
Thread Starter
 
Join Date: Nov 2007
Location: Belgium
Posts: 940
Total Cats: 59
Default

Quote:
Originally Posted by Zaphod View Post
Nice as usual... I even gave you a positive prop...
I actually LOLed
WestfieldMX5 is offline   Reply With Quote
Old 05-02-2013, 03:06 PM   #5
Senior Member
iTrader: (6)
 
Join Date: Aug 2009
Location: Charlotte, NC
Posts: 924
Total Cats: 16
Default

The #2 bmw was pnp (with fun bracketry, pnp wiring wise) on my install. It had to face backwards, towards the firewall to fit and rotate properly, and I believe that the voltage signal was reversed because of this. But it worked ok without switching any wires and such. Mine got some weird noise when it was cold outside, Im not sure what caused that issue.

Last edited by Gryff; 05-02-2013 at 03:20 PM.
Gryff is offline   Reply With Quote
Old 05-02-2013, 04:00 PM   #6
Senior Member
Thread Starter
 
Join Date: Nov 2007
Location: Belgium
Posts: 940
Total Cats: 59
Default

By 'voltage signal was reversed', do you mean that your tps is indicating backwards? 100% with no throttle and vice versa?
WestfieldMX5 is offline   Reply With Quote
Old 05-03-2013, 11:20 AM   #7
Senior Member
iTrader: (6)
 
Join Date: Aug 2009
Location: Charlotte, NC
Posts: 924
Total Cats: 16
Default

Quote:
Originally Posted by WestfieldMX5 View Post
By 'voltage signal was reversed', do you mean that your tps is indicating backwards? 100% with no throttle and vice versa?
yes.
Gryff is offline   Reply With Quote
Old 05-03-2013, 01:36 PM   #8
Senior Member
Thread Starter
 
Join Date: Nov 2007
Location: Belgium
Posts: 940
Total Cats: 59
Default

thx, I'll add that the wires need swapping then.
Out of curiousity, how does MS react to a reversed tps, since you didn't swap the wires?
WestfieldMX5 is offline   Reply With Quote
Old 05-03-2013, 02:01 PM   #9
Junior Member
iTrader: (1)
 
Join Date: May 2009
Location: TN
Posts: 328
Total Cats: 4
Default

Good info! I have been looking for another tps to replace my Wells unit, and the Vishay/Wabash tps in your writeup looks perfect.

Does anyone know a source in the U.S. for the Vishay tps? I have checked the digikey, mouser, and farnell part catalogs.
southernmx5 is offline   Reply With Quote
Old 05-03-2013, 02:08 PM   #10
Senior Member
Thread Starter
 
Join Date: Nov 2007
Location: Belgium
Posts: 940
Total Cats: 59
Default

I bought mine from RS components. Don't know if they operate in the US as well though.
WestfieldMX5 is offline   Reply With Quote
Old 05-03-2013, 03:12 PM   #11
Junior Member
iTrader: (2)
 
Join Date: Jun 2012
Location: Sherwood, AR
Posts: 105
Total Cats: 0
Default

I did a 91 tps conversion this week with a tps201. It works but I'm already worried that if I stomp the throttle hard enough a few times it's going to shave that tooth off. I'm gonna try to hunt down the vishay one I think, looks like a better way to go. Thanks for the info, good stuff.
Red91 is offline   Reply With Quote
Old 05-05-2013, 05:58 PM   #12
Junior Member
iTrader: (1)
 
Join Date: May 2009
Location: TN
Posts: 328
Total Cats: 4
Default

RS-components has a U.S. distributor named Allied Electronics. After some searching I found the Vishay/Wabash tps only by the part number 971-0002. It is not listed by either manufacturer name nor with a picture.

Search results for "971-0002" - Allied Electronics
southernmx5 is offline   Reply With Quote
Old 05-06-2013, 12:13 AM   #13
Senior Member
iTrader: (6)
 
Join Date: Aug 2009
Location: Charlotte, NC
Posts: 924
Total Cats: 16
Default

Quote:
Originally Posted by WestfieldMX5 View Post
thx, I'll add that the wires need swapping then.
Out of curiousity, how does MS react to a reversed tps, since you didn't swap the wires?
MS threw a short pissy fit iirc, but once it was calibrated it worked fine. Only thing to note, if you disconnect it, you may have fuel cut due to flood clear mode during cranking.
Gryff is offline   Reply With Quote
Old 05-06-2013, 06:12 AM   #14
Senior Member
 
Join Date: Dec 2004
Location: Brisbane, Australia
Posts: 1,272
Total Cats: 32
Default

I used #1 which was plug and play fit (wiring excepted) and I pulled it from some early-mid nineties 5 series auto.
timk is offline   Reply With Quote
Old 05-06-2013, 09:13 AM   #15
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,908
Total Cats: 1,793
Default

Quote:
Originally Posted by Red91 View Post
I did a 91 tps conversion this week with a tps201. It works but I'm already worried that if I stomp the throttle hard enough a few times it's going to shave that tooth off. I'm gonna try to hunt down the vishay one I think, looks like a better way to go. Thanks for the info, good stuff.
fill that spot with epoxy?

good luck finding the vishay.
Braineack is offline   Reply With Quote
Old 05-17-2013, 04:21 PM   #16
Junior Member
iTrader: (2)
 
Join Date: Jun 2012
Location: Sherwood, AR
Posts: 105
Total Cats: 0
Default

Quote:
Originally Posted by Braineack View Post
fill that spot with epoxy?

good luck finding the vishay.
I didn't ever find a vishay w/o ordering from the UK. Yeah I filled in the space with liquid nails. Works fine so far.
Red91 is offline   Reply With Quote
Old 05-18-2013, 02:57 AM   #17
Junior Member
iTrader: (1)
 
Join Date: May 2009
Location: TN
Posts: 328
Total Cats: 4
Default

Check the link I posted above. The Vishay tps part number #971-0002 is available from Allied Electronics which is the U.S. distributor for the R.S. Components (where Frank found it). The part numbers are the same and the price is the same at 60 usd on both websites, but the Allied site lacks a picture of the tps in their catalog.

R.S. Components Vishay tps link: http://uk.rs-online.com/web/p/precis...633D4E4F4E4526

Last edited by southernmx5; 05-18-2013 at 03:42 AM.
southernmx5 is offline   Reply With Quote
Old 05-19-2013, 02:01 AM   #18
Junior Member
iTrader: (1)
 
Join Date: May 2009
Location: TN
Posts: 328
Total Cats: 4
Default

Nevermind. Allied changed the availability of the tps to out of stock since I posted that link.
southernmx5 is offline   Reply With Quote
Old 05-19-2013, 07:54 AM   #19
Senior Member
Thread Starter
 
Join Date: Nov 2007
Location: Belgium
Posts: 940
Total Cats: 59
Default

They probably sold a bunch of them in the last couple of weeks
WestfieldMX5 is offline   Reply With Quote
Old 06-14-2013, 05:28 PM   #20
Senior Member
Thread Starter
 
Join Date: Nov 2007
Location: Belgium
Posts: 940
Total Cats: 59
Default

If anyone has found other vtps that work, please add the info here.
WestfieldMX5 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
My solution for Oiltemp and Oilpressure input into Megasuirt (MS3) Zaphod MEGAsquirt 41 01-24-2016 01:25 PM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 PM
Time to start learning and play with tuning The Gleas MEGAsquirt 3 10-01-2015 10:30 AM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM
BMW TPS / P&P TPS for Megasquirt albumleaf WTB 0 09-10-2015 10:28 AM


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 01:05 PM.