Just as the title states. me and seth (wizkiddrummer) are arguing about it right now. he says that you dont need your ECU if you are running megasquirt. is this true??
Ya, I've searched some more and as I understand it, it's exactly what i thought.
But we'll see what the experts say.
-Seth
I think that sequential injection will soon be an option on megasquirt. You can remove your ECU, but it will create MUCH more work than you have now.
Shifted wrote:You still need your ECU to drive your instrument cluster and automatic transmission if you have one. The MS will also not read your cam position sensor so you will be running in batch fire all the time.
So, say you had a manual tranny, ran your own gauge cluster of like autometer, and ran MSD DIS 2 then you could run without your ECU???
-Seth
O, ok.
It would just be batch fire and then if you wanted sequential then it would be good to use the DIS-II???
-Seth
Oops, I knew that, lol.
I thought there was a thing you could buy that would pick up the cam signal. I thought it was made by MSD, maybe not.
-Seth
I think trying to run MS as a standalone is far over your head, it really isnt simple, lots of rewiring, its just a huge headache.
lol - if I really wanted to run MS I could make it happen.
We we're just having an argument over whether it is a complete standalone. We decided that we we're both right in a way.
-Seth
MS can do either batch fire or bank fire. (3 and 3 in my case, or 2 and 2 on the 4cyl). But yeah like Shifted said above, and I ran into this myself. You need the factory PCM in order to operate the instrument cluster. I even, just for grins... hooked the VSS up directly to the input wire going into the C100 connector for the speedometer. And at about 30mph you see the gauge has gone all the way over to 115, flipped over and started counting up to about 60 again. So it's going to tell you about 170mph higher than actual speed.
On another note, Megasquirt only does fuel. MS-II is needed to have control over timing.
Quote:
We we're just having an argument over whether it is a complete standalone. We decided that we we're both right in a way
I agree with that. Megasquirt and Megasquirt-II are a complete standalone system, but it just depends on what it's application is. In the J-body, i guess you could say it isnt. At the same time, it's not really a piggyback system, because it's not relying on the stock PCM for any controls that are part of it's own operation.
OK......theres some information that is a little off throughout this entire post.
Shifted wrote:You still need your ECU to drive your instrument cluster and automatic transmission if you have one. The MS will also not read your cam position sensor so you will be running in batch fire all the time.
YES
shifted wrote:It won't be on the MS, its on the new one they are doing, based off of the relay board or something.
Fst Cavy is right on this one....sequential will be an option shorty on the MS....might not make it into the new MSnS-II code but it will be coming along as more people start using the MS for higher end stuff. The router board would/will make a great add-on to the MS-II but it looks like it is pulling away into a more competitive full-standalone system rather than an ad-on to the MS.
SHOoff wrote:On another note, Megasquirt only does fuel. MS-II is needed to have control over timing.
MS-I with the extra code can run ignition, as well as the MS-II native and extra code.
SHOoff wrote:Megasquirt and Megasquirt-II are a complete standalone system, but it just depends on what it's application is. In the J-body, i guess you could say it isnt. At the same time, it's not really a piggyback system, because it's not relying on the stock PCM for any controls that are part of it's own operation.
This is probably the best way to explain that.
As some what of a strange note here. For some strange reason, if your take out your stock ECU on the 95-99 cars. When you turn on the headlights, your left turn signal light on the dash turns on. It's really weird
I have verified that MS I with Msns-E code can be used as a full stand alone in pre-OBD11 cars with manual trans. Im running a 95, my factory ECM is on a shelf in the garage. The guage cluster works fine, as all of the instuments have there own sending units in the car and never worked from the ECM anyways. *EXCEPT* I did have to jump a wire for the Tach on the Factory ECM harness, and the speedo does not work without the Factory ECU hooked up. This is becuase the ECU has some signal filters that take the raw signal from the VSS, condition it to a usable signal, and then it goes to the cluster. Im working on duplicating that portion of the ECU, so my speedo will work correctly without the ECU in the car. Other than the speedo, full stand alone capable in pre obd2 5 speed cars!!!
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