Donate to the MX-3.com Forums
View unanswered posts | View active topics It is currently November 18 2019, 7:40 PM



Reply to topic  [ 13 posts ] 
 Installing my megasquirt 
Author Message
Senior Member

Joined: June 19 2004, 2:01 AM
Posts: 6451
Location: El Paso Tx U.S
Reply with quote
Post Installing my megasquirt
So I will be installing it from shadowme's 6th bulk buy. I just have a few questions and maybe simple to you .

What "Cut wire at ECU, splice to Injector." So I cut the wire that goes straight to ecu and leave nothing there? and then run that wire to the injector? or cut wire and leave it connected to ecu but at the same time to the injectors?


ALso what is the benefit of using the stock ecu with megasquirt and using megasquirt as standalone as it has two options?

Tap to ECU harness means that I make a cut and solder the wire to it right?

I need help 8nderstanding this.. so it wants me to CUT aka SNIP? My wires? When I am done the ECU will not have the wires going to it?(if i keep ecu)


1.10. Fuel Injectors
Installation: You have to snip all six Fuel Injector wires going to your factory ECU regardless of whether or not you are keeping the ECU. What you want to do is join them into TWO groups; one front bank cylinder with two rear bank cylinders in group ONE, then the remaining three cylinders in group TWO. Be sure you strip the wire back far, 1” or more, and carefully join al three wires in each group because it is critical you get a good connection here. I solder all my fuel injector wires to make sure the connections are good, then shrink-wrap or seal them with electrical tape. A missing injector can cost you a piston!! How the injectors work is simple: Each injector has two wires: one is 12v power directly from the ignition relay/battery: the other is the wire that goes into Megasquirt, it is activated when Megasquirt switches the wire to GROUND. Basically, Megasquirt is turning on and off the ground circuit to the injectors rapidly, and each time an injector is grounded it fires until it is ungrounded. It is critical not to have shorted wires, etc and a good idea to test each injector wire out at the fuel injectors for continuity into the Megasquirt wiring harness, using a voltmeter.


Injector Bank 1 Red 11, 12, 13 (C246) Cut wire at ECU, splice to Injector.

Injector Bank 2 Black 24, 25, 26 (C246) Cut wire at ECU, splice to Injector.

_________________
-hec

MX-3 w/ curved neck millenia klde, boosted @ 5 psi. /bov and wastegate are good!/ nitto drag radial/ gutted interior/ millenia red top injectors, vortech fmu/aem wideband/ all bolts ons/ Car put together 100% by me. Mechanic? who needs a mechanic? ew.. real men work on their own cars!


October 09 2011, 3:45 PM
Profile WWW
Regular Member
User avatar

Joined: July 26 2006, 3:54 PM
Posts: 1458
Location: Belfast -Northern Ireland
Reply with quote
Post Re: Installing my megasquirt
Benefits... hmm not a massive lot IMO. Do you use air con? Piggyback if you do. You'll also lose idle air control going standalone, unless you bother to sort it out. I started piggy back then went standalone, it was just tidier and easier to wire tuck.

Ok cut the injector wires at the ecu (well a few inches back so you could revert if you needed to). I used 6 pin connectors at first so I could easily return the wiring to the standard ecu. So now you have 6 wires. You need to group them into 2 sets as described. So now you have 2 sets of 3 wires. Each set of 3 is soldered into one of the injector output wires of the MS harness. If it's the same as mine then it's the grey sheathed wire with a red and black wire inside. They're thicker than the rest of them. This mean your stock ECU should now have no connections to the injectors, otherwise MS and ECU would be sending signals!
So the path is MEGASQUIRT>BLACK & RED WIRES>STOCK HARNESS WIRES>ENGINE BAY>INJECTORS

_________________
AZ-3 1498cc Turbo! EVO 8 turbo and manifold, 5 stud swap, SSR Type C, DIYPNP seq Megasquirt
Mx-3 2.5 V6 Turbo 291 BHP 251 lbft @ 8psi - Retired due to rust and back at uni
View Worklog
Image


October 09 2011, 5:19 PM
Profile WWW
Senior Member

Joined: June 19 2004, 2:01 AM
Posts: 6451
Location: El Paso Tx U.S
Reply with quote
Post Re: Installing my megasquirt
Sweeeeeeet! Thats just what I was looking for. I was confused as to why there are two sets of red and black but like you mentioned these are in a gray sleeve so those go to injectors. Awesome! :D Thanks!

I dont have an ac but it seems that for starters, piggyback seems the easier route.

_________________
-hec

MX-3 w/ curved neck millenia klde, boosted @ 5 psi. /bov and wastegate are good!/ nitto drag radial/ gutted interior/ millenia red top injectors, vortech fmu/aem wideband/ all bolts ons/ Car put together 100% by me. Mechanic? who needs a mechanic? ew.. real men work on their own cars!


October 09 2011, 5:56 PM
Profile WWW
Regular Member
User avatar

Joined: July 26 2006, 3:54 PM
Posts: 1458
Location: Belfast -Northern Ireland
Reply with quote
Post Re: Installing my megasquirt
No problem, good luck with the install! Let me know if you have anymore problems and I'll do my best to help :)

_________________
AZ-3 1498cc Turbo! EVO 8 turbo and manifold, 5 stud swap, SSR Type C, DIYPNP seq Megasquirt
Mx-3 2.5 V6 Turbo 291 BHP 251 lbft @ 8psi - Retired due to rust and back at uni
View Worklog
Image


October 09 2011, 6:11 PM
Profile WWW
Regular Member
User avatar

Joined: April 03 2006, 9:48 AM
Posts: 1632
Location: Netherlands
Reply with quote
Post Re: Installing my megasquirt
That is correct.

Also don't forget to cut the disti wire towards the ECU.

I've created a table in Excel that will indicate wiring to the ecu from a standard Pre facelift v6 Mx3.
You can PB me your email and I'll share it. (or if somebody knows how I can share it online i'll post it there)?

_________________
Just another Mx3 freak :)

Feedback topic: Click

Worklog
Worklog click


October 10 2011, 5:19 AM
Profile WWW
Senior Member

Joined: June 19 2004, 2:01 AM
Posts: 6451
Location: El Paso Tx U.S
Reply with quote
Post Re: Installing my megasquirt
Ok so disregard the last spam..

anyways ok I am close. Now the MS instructions call the ECU pin outs by NUMBER. Example PIN1 is black and goes to ground.

Yet on the ECU the pin outs are labeled 1U 1s 1q and so on. Not in a numerical order. any tips?

_________________
-hec

MX-3 w/ curved neck millenia klde, boosted @ 5 psi. /bov and wastegate are good!/ nitto drag radial/ gutted interior/ millenia red top injectors, vortech fmu/aem wideband/ all bolts ons/ Car put together 100% by me. Mechanic? who needs a mechanic? ew.. real men work on their own cars!


October 15 2011, 9:55 PM
Profile WWW
Senior Member

Joined: June 19 2004, 2:01 AM
Posts: 6451
Location: El Paso Tx U.S
Reply with quote
Post Re: Installing my megasquirt
I get it!! So last question I PROMISE. I think..

TAP into ecu means get the wire cut into it and join a wire to megasquirt while staying on the ecu at same time?

_________________
-hec

MX-3 w/ curved neck millenia klde, boosted @ 5 psi. /bov and wastegate are good!/ nitto drag radial/ gutted interior/ millenia red top injectors, vortech fmu/aem wideband/ all bolts ons/ Car put together 100% by me. Mechanic? who needs a mechanic? ew.. real men work on their own cars!


October 15 2011, 10:24 PM
Profile WWW
Regular Member
User avatar

Joined: April 03 2006, 9:48 AM
Posts: 1632
Location: Netherlands
Reply with quote
Post Re: Installing my megasquirt
Correct.

_________________
Just another Mx3 freak :)

Feedback topic: Click

Worklog
Worklog click


October 17 2011, 3:39 AM
Profile WWW
Regular Member
User avatar

Joined: November 10 2008, 2:10 PM
Posts: 223
Location: el PASO Texas
Reply with quote
Post Re: Installing my megasquirt
hows it coming along hec

_________________
1992 gs k8ze . 4 inch tip 2.5 cat , cold air intake ,corksport front and rear stut bars home made upper pillar bar , prosport gauges,megan racing 4 pts harnest, 10,000 K HID's , ksport suspension ,


October 17 2011, 4:49 PM
Profile YIM
Senior Member

Joined: June 19 2004, 2:01 AM
Posts: 6451
Location: El Paso Tx U.S
Reply with quote
Post Re: Installing my megasquirt
Guys I need some final help as far as wiring goes. Its all done except two wires.


PINK which is for launch control. It reads "Wire to clutch pedal. Ground to activate"

Switchable tables reads "Ground to activate"


Almost there!

_________________
-hec

MX-3 w/ curved neck millenia klde, boosted @ 5 psi. /bov and wastegate are good!/ nitto drag radial/ gutted interior/ millenia red top injectors, vortech fmu/aem wideband/ all bolts ons/ Car put together 100% by me. Mechanic? who needs a mechanic? ew.. real men work on their own cars!


October 22 2011, 8:59 PM
Profile WWW
Regular Member
User avatar

Joined: July 26 2006, 3:54 PM
Posts: 1458
Location: Belfast -Northern Ireland
Reply with quote
Post Re: Installing my megasquirt
You don't need switchable tables unless you're running n2o

Launch control you tap into the switch above the clutch pedal. It took a bit of experimenting to get the right one for me.

_________________
AZ-3 1498cc Turbo! EVO 8 turbo and manifold, 5 stud swap, SSR Type C, DIYPNP seq Megasquirt
Mx-3 2.5 V6 Turbo 291 BHP 251 lbft @ 8psi - Retired due to rust and back at uni
View Worklog
Image


October 23 2011, 5:00 PM
Profile WWW
Regular Member
User avatar

Joined: April 03 2006, 9:48 AM
Posts: 1632
Location: Netherlands
Reply with quote
Post Re: Installing my megasquirt
Did the table I've send help you ?

_________________
Just another Mx3 freak :)

Feedback topic: Click

Worklog
Worklog click


October 26 2011, 3:35 AM
Profile WWW
Senior Member

Joined: June 19 2004, 2:01 AM
Posts: 6451
Location: El Paso Tx U.S
Reply with quote
Post Re: Installing my megasquirt
Install was a failure, reverted back to stock wiring. Check my post in the v6 tech section for weak spark.

_________________
-hec

MX-3 w/ curved neck millenia klde, boosted @ 5 psi. /bov and wastegate are good!/ nitto drag radial/ gutted interior/ millenia red top injectors, vortech fmu/aem wideband/ all bolts ons/ Car put together 100% by me. Mechanic? who needs a mechanic? ew.. real men work on their own cars!


November 28 2011, 6:53 AM
Profile WWW
Display posts from previous:  Sort by  
Reply to topic   [ 13 posts ] 

Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
cron
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group.