Stock ECU Fan mod "backup"? - 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 03-25-2009, 10:00 PM   #1
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Oct 2006
Location: Cincinnati, OH
Posts: 375
Total Cats: 0
Default Stock ECU Fan mod "backup"?

Am I correct in assuming that when wired in parallel via boomslang with the stock ECU fan wire staying connected along with the Megasquirt signal wire, that the stock ECU will provide a failsafe fan turn-on at stock temps if anything in MS goes awry?

I'm also jumpering 1J to 1R for dual fans per this thread.
StankCheeze is offline   Reply With Quote
Old 03-25-2009, 10:11 PM   #2
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,899
Total Cats: 1,792
Default

correct.
Braineack is offline   Reply With Quote
Old 03-26-2009, 12:22 AM   #3
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Oct 2006
Location: Cincinnati, OH
Posts: 375
Total Cats: 0
Default

Sexy.
StankCheeze is offline   Reply With Quote
Old 03-26-2009, 08:00 AM   #4
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Delicious and Moist.
Posts: 26,327
Total Cats: 1,926
Default

Be aware that, assuming this is in your '92, the cooling fan is not controlled by the stock ECU, but rather by the thermoswitch on top of the thermostat housing. The ECU wasn't given control of the primary cooling fan until '94. In the '90-'93 application, the ECU turns on the fans only when A/C is on.
Joe Perez is offline   Reply With Quote
Old 03-26-2009, 10:31 AM   #5
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,899
Total Cats: 1,792
Default

this also means that if the thermoswitch is grounded, the fans are on, even if MS doesn't tell them to.
Braineack is offline   Reply With Quote
Old 03-26-2009, 01:12 PM   #6
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Oct 2006
Location: Cincinnati, OH
Posts: 375
Total Cats: 0
Default

Yeah, it looks like it'll still work, as brain said, but thanks for the correct info.

After looking at the diagrams a little more closely, jumpering 1J (AC relay) to 1R (fan) at the ECU connector might energize the compressor clutch, though, when the fans kick on. Should I confine the dual fans wiring to the engine compartment if I still have AC installed?
StankCheeze is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 59 12-15-2017 09:00 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 04:26 AM.