Call me a Volunteer, but MS-ing an Automatic? - 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 10-20-2012, 09:54 AM   #1
Elite Member
Thread Starter
iTrader: (12)
 
GeneSplicer's Avatar
 
Join Date: Sep 2009
Location: Birmingham, AL
Posts: 2,006
Total Cats: 147
Default Call me a Volunteer, but MS-ing an Automatic?

Why? Because I can - or would at least want too... I've actually been enjoying the daily in Auto trim - I'm just getting old.

Anyway, I bought Pdetxa's 99-00 PNP off him when his poor car was totalled - I have everything to do a manual swap, but wanted to try the auto first. The issue I see is controlling the transmission shift points. If it's not possible, with out great lengths of electronic mastery (any all all), then I'll just have to go ahead with the manual swap - or use the stock ecu with a piggyback.

I was just curious how the auto would hold up/behave under boost - and when it blows chunks, swap the manual stuff in.

Haven't really seen anyone turbo an Auto - anyone? Searched but found fail...
GeneSplicer is offline   Reply With Quote
Old 10-20-2012, 11:03 AM   #2
Elite Member
Thread Starter
iTrader: (12)
 
GeneSplicer's Avatar
 
Join Date: Sep 2009
Location: Birmingham, AL
Posts: 2,006
Total Cats: 147
Default

LOL at title change...

Found this from Joe Perez back in the day from M.net:

Quote:
Hmmmm.

The only electrical connection between the ECU and the A/T controller is a single wire at position 2Z on the ECU, but the factory manual is giving me no help at all on what the function of that wire is.

I think my recommendation for a parallel build stands. Leave the stock ECU in place to handle the A/T, A/C, ISC, etc., and let the MS run spark and fuel. This process is reasonably well-documented here: How to make and install your own Diy MegaSquirt - Miata Turbo Forum - It's the Cat's Meow

Essentially, you'd cut the two lines driving the injectors (2U, 2V) and the two lines driving the ignition (1H, 1G) and run these to the MS. You'll also splice into the lines for power, TPS, CLT and CAS, and run these also to the MS.


You can save some time (at the cost of some money) by ordering an ECU extension harness from Boomslang, rather than piecing together your own: http://www.boomslang.us/extension.htm


Anybody know what kind of torque a stock A/T can handle? I'm thinking particularly of a shift under boost.

Is Pen_2 still rocking an Auto? - He called me a bad word and doesn't like me - maybe it's about the unicorns on his wall


Glitters (Brain) - want to build a piggy back harness for me like you built in the quoted thread link?
GeneSplicer is offline   Reply With Quote
Old 10-20-2012, 11:11 AM   #3
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,876
Total Cats: 1,790
Default

i think it sends a ground to the unit with key on.
Braineack is online now   Reply With Quote
Old 10-20-2012, 11:12 AM   #4
Elite Member
Thread Starter
iTrader: (12)
 
GeneSplicer's Avatar
 
Join Date: Sep 2009
Location: Birmingham, AL
Posts: 2,006
Total Cats: 147
Default

GeneSplicer is offline   Reply With Quote
Old 10-20-2012, 11:29 AM   #5
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,876
Total Cats: 1,790
Default

i mean i dunno. there's like 2 references to 2Z. it says 0v when key on, and if ever vb the ECU is bad. but who knows if it's a signal of sorts.
Braineack is online now   Reply With Quote
Old 01-19-2013, 07:39 PM   #6
Elite Member
iTrader: (4)
 
Pen2_the_penguin's Avatar
 
Join Date: Dec 2009
Location: Reno, NV
Posts: 3,690
Total Cats: 97
Default

I didnt even see this thread before I got a sext message from genesplicer...


...to answer the question for everyone here. Yes, I ran an automatic with a MSPNP just fine @ 15psi, until my partout for cash. It ran just fine with no issues with the transmission. The automatic has a separate control module for the transmission itself.

It is okay to plug in and tune a MS just fine without needing a piggyback.

<3
Pen2_the_penguin is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Need help - Stock Balancer and Fastforward overlay pulleys Frank_and_Beans Supercharger Discussion 13 09-12-2016 09:17 PM
LucaCarMods's Boosted Dutch Miata Build! LucaCarMods Build Threads 11 02-14-2016 07:13 AM
Auto Engine into Manual Car Wino General Miata Chat 0 09-23-2015 09:35 PM
Interpreting Deatchwerks Dead Times from Battery Wizard compuw22c MEGAsquirt 0 09-14-2015 07:08 PM
WTB: Nardi wood parts mdkimbal WTB 0 09-06-2015 10:39 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 10:00 AM.