ECUs and Tuning Discuss Engine Management, Tuning, & Programming

Do i need to run my coil on plug on switched power?

Thread Tools
 
Search this Thread
 
Old 01-20-2015, 10:08 PM
  #1  
Newb
Thread Starter
 
dannymo's Avatar
 
Join Date: Sep 2014
Location: Santa Cruz
Posts: 32
Total Cats: 0
Default Do i need to run my coil on plug on switched power?

Do i need to run my coil on plug on switched power? running from my megasquirt and wondering if the 12v power need to be a switched power feed.
dannymo is offline  
Old 01-21-2015, 09:29 AM
  #2  
Supporting Vendor
 
Matt Cramer's Avatar
 
Join Date: Sep 2006
Posts: 2,332
Total Cats: 67
Default

Switched is definitely better.
__________________
Matt Cramer
www.diyautotune.com
Matt Cramer is offline  
Old 01-21-2015, 11:35 AM
  #3  
Elite Member
 
JasonC SBB's Avatar
 
Join Date: Jul 2005
Posts: 6,420
Total Cats: 84
Default

If you run it on always-on 12V, there's a possibility that the coil drivers will "phantom power" the ECU through the coil outputs, leading to unpredictable behaviour.

Additionally, the circuitry of the coil packs will drain your battery.
JasonC SBB is offline  
Old 01-21-2015, 01:47 PM
  #4  
Newb
Thread Starter
 
dannymo's Avatar
 
Join Date: Sep 2014
Location: Santa Cruz
Posts: 32
Total Cats: 0
Default

I figured it was a bad idea, but was not quite sure. Thank you for your help
dannymo is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
tazswing
Race Prep
9
10-01-2015 12:33 AM
zephyrusaurai
Meet and Greet
2
09-28-2015 10:59 PM
btabor
ECUs and Tuning
10
09-28-2015 05:33 PM
ihiryu
General Miata Chat
9
09-28-2015 10:22 AM



Quick Reply: Do i need to run my coil on plug on switched power?



All times are GMT -4. The time now is 05:25 PM.