megasquirt (fuel only) wiring ...

[ForceFed Wraith]

Couple questions about wiring in the megasquirt ...

1) Do you want to keep a constant 12V supply to megasquirt or do you want to run it off the ignition switch.
2) If I run megasquirt off the ignition switch, will it get power during start-up (since all other circuits are switched off during this phase)?

http://www.megasquirt.info/manual/mwire.htm#exwire

- From this link, I dont completely understand the wiring for the fuel injectors ... what do the blue and red wires do? (I'm guessing the reds are the power wires and the blue are trigger wires for the injectors?)

- For those who have done this, why use those 2A and 5A fuses everywhere?

Any additional insights on this, and turbododge success stories? Any help on this will be appreciated since I'm a kind of a rookie at EMS's.

Also, is anyone running the EDIS-4 on a turbododge? that will be my future project.

[ForceFed Wraith]

only one view? I guess megasquirt isn't that popular with TDs.

ttt.

[Runner]

Not too much help here, as I've never even heard of this megasquirt business, but I can tell you about power: not all circuits shut off with the ign sw in the "start" position. How else would the car start? Again, I know nothing, but I would imagine you'd want it to shut off when the car is off, unless there's some sort of memory that needs to be kept.

Circuit J2, (dark blue) that can be found at various devices, (mostly your solenoids, not sensors as they are powered off the computer) would be a good candidate for 12v with the key in the 'on' and 'start' positions.

[SuddenImpactMS]

I know a couple people here in Windsor that have installed it but never in a TD. I have thought about it but its just so much simpler to give Cindy a call and not worry about a thing.

[JoshCP]

Um if you need a pic of my um wiring for my megasquirt I'll send it and um you need to add the spark feature lol. Trust me you'll find out the hard way when it wont run till you plug all the old stuff back in .

[JoshCP]

The computer wont work just the spark on our cars. Becouse you need to use the hall sensor for spark also I can show you how I made it work too becouse I had to make the trigger adjustable between the cap and base easy fix too. But you need a non turboed trigure wheel the window tends to mess things up there agan learned from exp. Too bad all I had time to do was tun for startup and not much on driving it yet well driving alot yet.

[Una]

I put MS in my '83 Shelby Charger. Non turbo. I used the 1 piece turbo manifold. Really a nice setup, runs like a champ, gets 40mpg on the freeway easily.. (go figure tho, it's got a lower drag co-efficient than a Honda insight..) Anyways, yes, the dark blue wires under the hood tend to be ignition power. I think I sourced it at the coil itself. I got the ignition trigger for the MS from the back of the instrument cluster. Nice clean signal there. Feel free to email me if you need more help.

[JoshCP]

Una Ever wana put the programable spark on it. It works nice . I have it both working and running I just dont have time to drive and I hate nb tunning so unpredictable. I grafted it all in to replace the stock computer. Tack doesnt work but I got spedomiter to and all other guages. I heard the stock comp had the tack decoder in it so I guess I was screwed there but I think its a clean install for now. Lights and all work pluss I also converted it to a 5spd 2.5 T2 stuff.

[JoshCP]

Oh and for any one that say the alt wont work easy fix is buy an old stand alone regulator the alts never changed it was the regulators home that changed . that works now too wich is also why I had to run spark with it also.

[Una]

The Shelby Charger's spark control computer uses the knock sensor. That reason alone was enough reason for me to leave it in there. Megasquirt can't use a knock sensor. Not to mention it's sooo much easier to tune a car when you only have the fuel to deal with, thinking about trying to tune fuel AND spark at the SAME TIME just makes my stomach turn.

[Una]

Oh yeah.. Pictures:
http://pg.photos.yahoo.com/ph/megasq...rted/my_photos

[ForceFed Wraith]

Thanks for the replies guys. I'll be getting my unit very soon ...2 - 3 weeks. I'll definitely bother you with a lot of questions :-)

[igotaneed4speed]

Quote:

Originally Posted by Una The Shelby Charger's spark control computer uses the knock sensor. That reason alone was enough reason for me to leave it in there. Megasquirt can't use a knock sensor. Not to mention it's sooo much easier to tune a car when you only have the fuel to deal with, thinking about trying to tune fuel AND spark at the SAME TIME just makes my stomach turn.

yea it sux i got the haltech and its doesnt have any self learn features. You have to tune for fuel and timing curves and then deal with temp vairance imputs from the coolant, egt's and air temp sensor's ...

its a pain in the A**

[Una]

Quote:

Originally Posted by igotaneed4speed yea it sux i got the haltech and its doesnt have any self learn features. You have to tune for fuel and timing curves and then deal with temp vairance imputs from the coolant, egt's and air temp sensor's ... its a pain in the A**

Eeek.. Yeah, the fuel programming with MS was brainless. It was good enough to drive one right out of the box, and using datalogging, it was able to tune itself after a couple drives. Another drive with a friend driving while I adjusted things myself, and I got the flat spots out of the curve and I haven't touched it since. Hardest part was the cold start enrichments, which I never bothered to fix. It's a finicky ***** to start sometimes, but maybe I'll get back to it and fix that when I care enough to. I sold the car to my friend, and he hasn't asked me to fix it yet.

[JoshCP]

So the flat spots had to be taken out manually I needed to know that.