Stimulator polarity - 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 10-20-2010, 10:35 PM   #1
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Sep 2010
Location: Australia
Posts: 168
Total Cats: 10
Default Stimulator polarity

Hey guys,

Have searched - here, google, MS Extra, etc - can't find an answer.

All I need to know is the polarity of the Megasquirt stimulator. Brain has built me a DIYPNP. I can't use the 110v Stim sold by DIY because in Australia we use 240v mains power. I don't want to use a 240v ==> 110v inverter - I've had one catch fire before, not fun. Besides, they are ******* expensive and a 12v DC transformer for 240v is <$10 in Australia.

So someone, anyone, can you tell me whether the (+) is on the inside or outside of the plug on your Stimpower? I do not want to **** this up and burn out something in my new MS.
zossy1 is offline   Reply With Quote
Old 10-21-2010, 12:32 AM   #2
Junior Member
 
kday's Avatar
 
Join Date: Aug 2008
Location: Boston
Posts: 223
Total Cats: 0
Default

Assuming you have an ohmmeter, just measure between a ground pin on the ECU connector and the inside and outside of the power jack on the stim. Whichever shows you zero ohms is where the negative side of the wall wart should be.
kday is offline   Reply With Quote
Old 10-21-2010, 12:51 AM   #3
Newb
 
Join Date: Feb 2009
Location: Brisbane, Australia
Posts: 31
Total Cats: 0
Default

Which stim are you using? If it's a Jimstim, here is the page you are looking for:

http://jbperf.com/JimStim/JimStim_v1...bly.html#ready

If it's that other stim DIY sells, it's likely to be the same, but check it via a multimeter as above.
Kain is offline   Reply With Quote
Old 10-21-2010, 12:56 AM   #4
Senior Member
iTrader: (14)
 
Join Date: Aug 2008
Location: Tinley Park, IL
Posts: 1,488
Total Cats: 0
Default

The stim has a connector to hook up wires to marked + and -, yes? It at least has a spot for one. Follow the traces on the back of the board from the positive one to the plug. It should lead to the center pin. At least if it's a V2.21 stim it should.
lordrigamus is offline   Reply With Quote
Old 10-21-2010, 10:21 AM   #5
Senior Member
 
Join Date: Nov 2007
Location: Belgium
Posts: 939
Total Cats: 59
Default

center pin is positive, outside is negative. The one you linked should be fine, provided the diameter of the plug is correct.
WestfieldMX5 is offline   Reply With Quote
Old 10-21-2010, 10:29 AM   #6
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Sep 2010
Location: Australia
Posts: 168
Total Cats: 10
Default

This is good stuff, but I should clarify - I only really need the stimpower - basically, I need a 240v version of this:

http://www.diyautotune.com/catalog/m...ply-p-168.html

My ohmmeter is on the slow boat to Australia along with most of the rest of my tools and other shizz. No big deal though, can't really do much of anything else until it all arrives. I just wanted to play around with the MS in the meantime, get a feel for TS and the settings.
zossy1 is offline   Reply With Quote
Old 10-21-2010, 10:30 AM   #7
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Sep 2010
Location: Australia
Posts: 168
Total Cats: 10
Default

Quote:
Originally Posted by f_devocht View Post
center pin is positive, outside is negative. The one you linked should be fine, provided the diameter of the plug is correct.
Win! Many thanks.
zossy1 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
MegaSquirt Stimulator Pseudosport Miata parts for sale/trade 4 09-09-2010 02:38 PM
Want To Rent: Megasquirt Stimulator hotspoons WTB 2 04-21-2010 03:59 PM
WTB MegaSquirt Stimulator drbogg WTB 0 03-27-2009 12:29 AM
MegaSquirt Stimulator Board v2.2 Braineack Miata parts for sale/trade 5 03-24-2009 05:18 PM
Under 20? Savington Insert BS here 46 05-11-2008 11:18 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 04:26 AM.