MS + stock ECU; anybody else done it this way? - 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 07-30-2008, 11:43 AM   #1
Newb
Thread Starter
 
Join Date: Jan 2007
Posts: 21
Total Cats: 0
Default MS + stock ECU; anybody else done it this way?

Hey everyone,
My friend John and I just got his car turbocharged. We were forced to run just over 10 psi right off the bat because of the wastegate, and it could not have gone any better!

I got a little creative with the way I wired in the MS, and am wondering how many others did it this way. We left the stock ECU in place as we progressively replaced its functions with MS. Basically the MS is simply spliced into the two trigger wires, leaving the stock ECU seeing that the engine is running. The output wires from the stock ECU to the injectors and ignition driver are simply cut, and the components re-wired into MS. We added a GM coolant temp sensor to Megasquirt, and left the stock one in place. The fuel pump it activated through the relay board, since the stock ECU only turns it on with the AFM flap open (oh, and thats simply unplugged).

What this gives us is full fuel + spark control through MegaSquirt, but leaves the stock ECU controlling the idle valve and fans. As we started out using the MS for fuel only with the stock ECU controlling spark, this was a very natural progression and allows us to switch these remaining functions over to MS later on down the road.

Who's done it this way?


Note most of that rats nest is due to us having two widebands wired in temporarily. Innovates can be a pain to set up!
Gavin is offline   Reply With Quote
Old 07-30-2008, 12:17 PM   #2
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,317
Total Cats: 1,914
Default

Congrats. You've just accomplished what we call a parallel install here- MS doing spark + fuel, ECU doing idle and other things.

Opinions are largely divided on this setup- not in terms of functionality but from the standpoint of ease of installation and tuning. But it appears you've gotten yourself up and running, and that's what counts.
Joe Perez is offline   Reply With Quote
Old 07-30-2008, 12:28 PM   #3
Elite Member
iTrader: (9)
 
Saml01's Avatar
 
Join Date: Jul 2007
Location: NYC
Posts: 5,730
Total Cats: 2
Default

^ its the easiest, nothing to be divided on. Less futzing around with idle valve settings and getting AC to run.

I'm more curious how he got the over the rad pipes to work. 2 inch pipes?

I also like the home depot sink drain coupler on the cold side, very inventive.
Saml01 is offline   Reply With Quote
Old 07-30-2008, 12:29 PM   #4
Junior Member
 
Join Date: Oct 2007
Location: AC, NJ
Posts: 346
Total Cats: 0
Default

I think a lot of people have done it this way. It allows us OBDII people to return codes so we can pass inspection, while having MS handle spark and fuel for turbo use.

PS: Smart move moving things over one at a time. Much easier to troubleshoot if you run into a problem. I am amazed some people buy an EMS and turbo and slap it all on at once, and when something goes wrong, they have no clue.
compy is offline   Reply With Quote
Old 07-30-2008, 12:33 PM   #5
Newb
Thread Starter
 
Join Date: Jan 2007
Posts: 21
Total Cats: 0
Default

Thanks guys. I knew it had been done for sure, just not sure if it was done exactly the way I did it.

2" pipes fit easily if you cut a bit of the reinforcement out of the very front of the hood. Home Depot couplers are temporary, but yes, highly functional!
Gavin is offline   Reply With Quote
Old 07-30-2008, 12:41 PM   #6
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,838
Total Cats: 1,787
Default

what's the big mess of relays behind the intake manifold?


...click the link in my sig to see how most of us do parallel installs.
Braineack is offline   Reply With Quote
Old 07-30-2008, 12:45 PM   #7
Newb
Thread Starter
 
Join Date: Jan 2007
Posts: 21
Total Cats: 0
Default

Standard MS relay board. Simplifies the hell out of everything. Just the fuel pump relay and main MS relay. Its actually not near as messy as it looks in this pic since we pulled everything apart and were too excited by it running so well to put it back.
Gavin is offline   Reply With Quote
Old 08-01-2008, 06:44 PM   #8
Senior Member
iTrader: (2)
 
Join Date: Jun 2006
Location: Springfield, NJ
Posts: 670
Total Cats: 0
Default

Gavin, that's the same way mine is configured. Read about it here: https://www.miataturbo.net/forum/sho...ght=put+ms+msm.
evank is offline   Reply With Quote
Old 08-01-2008, 08:09 PM   #9
Elite Member
iTrader: (12)
 
Join Date: Aug 2006
Location: Central-ish VA
Posts: 4,449
Total Cats: 16
Default

I want to be the first one to welcome you to the Internet.

Welcome.
neogenesis2004 is offline   Reply With Quote
Old 08-10-2008, 06:21 AM   #10
Junior Member
iTrader: (6)
 
Join Date: Aug 2008
Location: New Zealand
Posts: 250
Total Cats: 3
Default

Great post, has answered a lot questions for myself!!

Cheers
ogwazza is offline   Reply With Quote
Old 08-10-2008, 02:56 PM   #11
Guest
iTrader: (6)
 
Join Date: Sep 2007
Location: Vaughan, On, Canada
Posts: 1,092
Total Cats: 0
Default

Same way mine is setup also
M-Tuned is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Raleigh: Fiberglass headlight scope, 1.6L ECU, AFM, Hardtop latches, more bigmackloud Miata parts for sale/trade 13 09-22-2017 01:34 PM
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 57 07-19-2017 05:11 PM
WTB MP62 (Hotside) (NB2) Rick02R WTB 3 01-03-2016 08:18 PM
Expected intake temps on the track? tazswing Race Prep 20 10-03-2015 12:04 PM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 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 12:37 PM.