megasquirt wiring question

[92_2_fast]

So for anyone who is using a mega squirt, how difficult is it to wire in. Currently I am running a safc and had no problems wiring it in. I would evn feel fine with a haltec, but I don't know anything about the m.s.. Does it use the factory wiring harness, do you have to make your own harness, do you use the stock ecu??? I have more q's but Ill just wait till some one responds.

[Tazman2]

*looks around for mikeflys1*

[silverchris]

If you know what you are doing and have read here you can probably do it. It doesn't look that hard. But I have not done it yet.

[Maz1.8T]

Pretty straight forward ... It was my first wiring and it worked great ...

Follow that:

[92_2_fast]

OMG that is what I have been looking for!!! Thank you SOOOOOOO much.

[mikeflys1]

*looks around for mikeflys1*

I used the stock harness but you can also buy a harness kit and use that. You can totally replace your stock ecu with it as long as you do the ignition mods too (very easy).

[mikeflys1]

Wiring using the stock harness.........(using MSD box and a wbo2)


Grounds: Black/Light Green, Black/Orange, Black/Blue (Signal Return)
Switched 12v: White/Red
Coolant Temp: Blue/White
Air Temp: Red/Black
TPS: Red/White?
Tach Signal: White (DO NOT use the Yellow/Blue wire or it will only fire cyl #1)
Spark Output: Green/White (Run to MSD Box)
Fuel Pump Relay: Light Gray
Injectors: #1 Yellow
#2 Yellow/Black
#3 Grey/Red
#4 Grey/Yellow (might be green/red and green/yellow i forget......You can tell the injector wires though cause they are thicker than the rest....like 14 gauge or so)
5V Reference: Light Gray/Red



Then you have to splice in an air temp sensor into the vaf wiring......Cut the Green/White wire at the ignition module under the coil and run it into the msd box. Run the msd tach wire to the yellow/blue coil wire. I used the stock coolant temp sensor instead of the gm one too.

btw this is all from my egt.....i would definately check the wires to make sure they're the same.

[92_2_fast]

I really appriciate your help! So if you use the stock harness can you piggy back the ecu or do you replace it. Do you get good off boost mid boost and full boost fuel managment? What was the total cost to do it? The Mallory ignition box you used, was it a btm type thing? In the diagram above, it shows the injectors sharing wires. Is that really how you did it or did you seperate them as I would think it should be? How do you rewire for a map sensor?

[bcrx7]

it's pretty easy to wire it up, Under 20 wires. I got the stock ignition working with the MegaSquirt Extra software as well without any modifications to the ignition system. Pretty easy. I think I will do a write up on what color should connect where on the stock ECU to megasquirt.

[Lex]

how difficult was it to tune the MS properly?

[OCD-SPEED]

thats the beauty of it lex, no tuning as far as i know. It all runs off your 02 sensor.

[Gro Harlem]

but how do you get it running initially? the MS is a program-urself system so how does it know what fuel maps & ignition maps to use? Is tehre some kind of auto-detect software that can detect the stock ecu's maps?

Thats the thing i'm worried about. I've been considering installing a MS on my KLZE


What ab out the distributor? someone told me u have to use coil packs, can't use a disty, but i dunno.

And lastly, what about the interior stuff? don't you still have to retain the stock ECU so it runs the interior-related crap like A/C, CC, PS and stuff?

[redfox]

i have also been concidering the MS....if you do decide to get 1 let me know and ill grab 1 and we can meet up somewhere and fumble around with it together

[D323]

subscrizle.


someone should do a how-to

[Lex]

I am guessing you need a wideband O2 sensor for it to tune itself ...