Notices
Conversions & Hybrids LSX Engines in Non-LSX Vehicles
Sponsored by:
Sponsored by:

LS boat conversion

 
Old 06-17-2019, 06:44 PM
  #1  
Teching In
Thread Starter
 
Join Date: Sep 2009
Location: Tennessee
Posts: 7
Likes: 0
Received 0 Likes on 0 Posts
Default LS boat conversion

In process of swapping an LS into a sterndrive boat. Got most of the preliminary stuff sorted, but still have one unresolved item. The boat has a Mercruiser Alpha One Gen 2 outdrive and had a carb 4.3L originally. That setup uses an interruptor switch on the shift linkage to cut power to the ignition coil while the gears engage from neutral to forward or reverse. How in the world can I replicate this on the multi coil ignition system? I donít want to turn the engine/ECU/main power off, just blip the ignition signal to the coils. Assume I will have a pull out 5.3L with full factory harness. Any ideas?
sheajeanes is offline  
Old 06-17-2019, 06:54 PM
  #2  
TECH Fanatic
 
Join Date: Oct 2016
Location: PDX-OR-USA
Posts: 1,230
Likes: 0
Received 4 Likes on 4 Posts
Default

You could maybe interrupt the power to the injectors with a good relay. Assuming your just looking for a blip that should do it without excessive drama.. Check a LS wiring diagram but I believe its 1 or 2 fused connections to the injectors that then get grounded by the ECU to trigger them. Other option is to get a tuner to set up something that would cut your idle air way down while the switch is closed, kinda like the trigger for the AC..
pdxmotorhead is offline  
Old 06-18-2019, 07:51 AM
  #3  
TECH Fanatic
 
1964SS's Avatar
 
Join Date: Aug 2012
Location: Mesa, Arizona
Posts: 1,295
Received 3 Likes on 3 Posts
Default

As motorhead said you could still cut the power. Even to the coils. All 8 coils either share a common hot or hot wire for each bank.
1964SS is offline  
Old 06-18-2019, 10:13 AM
  #4  
cam
TECH Junkie
iTrader: (9)
 
Join Date: Apr 2004
Location: in the garage
Posts: 3,200
Likes: 0
Received 0 Likes on 0 Posts
Default

Yup. Each side is powered by a single fuse. No reason at all you couldn't place an interupter in there before those feeds but I think you could probably tune it to be tame enough to allow smooth shifting. Consult a reputable tuner and work with what they suggest is a good route to ensuring your end result performs as expected.
cam is offline  

Thread Tools
Search this Thread

About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: