What do I need for megasquirt
CaptainJosh - 29/9/07 at 08:02 PM
If i want to run megasquirt on my car for fuel AND ignition, what do I need to buy?
That is other than:
+ Megasquirt II v3 ECU with relay board
+ TPS
+ MAP sensor
+ Wideband O2 sensor
+ Injectors, rail etc.
+ Throttle bodies
I am confused as to how the spark setup is supposed to work, i hear alot about the ford edis and such, but I hear all this can be done onboard?
The engine I am using was originally fuel injected but ran on a distributer if that helps.
To be honest, its all very confusing, but i write computer programs for a living, so the software side really isn't going to be a problem.
I just need to know what else im going to need, especially for the spark 
Cheers in advance
-Josh
p.s. Im sure this has been posted a million times before, but i couldn't find what i was looking for, sorry.
[Edited on 29/9/07 by CaptainJosh]
coozer - 29/9/07 at 08:06 PM
Depends which engine but an Edis module coil pack and some sort of crank position trigger from a zetec engined Ford will be required.
Every thing you mention above deals with the fueling only....
[Edited on 29/9/07 by coozer]
MkIndy7 - 29/9/07 at 08:10 PM
A toothed wheel
Crank Position Sencor
Coil pack
The toothed wheel is ligned up relative to top dead centre on the Crank pulley.
The CPS reads this and passes it either straight to the MS or via the Ford EDIS unit depending on the version of MS you get.
This then looks up in its map what advace it should give relative to MAP or TPS Vs RPM and then feeds this advance signal back to the EIDS or straight
to the coil pack (if no EDIS).
The only reason some people see to have EDIS with the current versions of MS is that it can run in "limp home" should there be a fault..
although if there is such a fault with the MS unit then fueling side isin't likely to work either!
CaptainJosh - 29/9/07 at 10:18 PM
Cheers for the quick replies guys, its cleared it all up 
Thanks again!
Chippy - 29/9/07 at 10:53 PM
Hi, think that V3 applies to Megasquirt 1, and not 11, or is that just a typo? Cheers Ray
martyn_16v - 30/9/07 at 09:20 AM
v2.2 / v3 is the version of the mainboard hardware, and then MS1 / MS2 is the version of the processor (and then on top of that there's all the
different firmware releases/version for each processor stream). Complication is the price of progress, apparently 
What engine is it you're trying to squirt? There's so many users out there now the chances are someone's done it before you and so may
have some useful advice, and some are more straightforward than others
MikeRJ - 30/9/07 at 11:05 PM
quote:
Originally posted by CaptainJosh
If i want to run megasquirt on my car for fuel AND ignition, what do I need to buy?
That is other than:
+ Megasquirt II v3 ECU with relay board
+ TPS
+ MAP sensor
+ Wideband O2 sensor
+ Injectors, rail etc.
+ Throttle bodies
I am confused as to how the spark setup is supposed to work, i hear alot about the ford edis and such, but I hear all this can be done onboard?
There are two common methods you can use for spark: the Ford EDIS igntion system can be driven by the Megasquirt. The EDIS is an igntion computer and
coil driver that does all the hard work of driving an ingition coil, e.g. dwell, time/angle conversion, high current drivers etc. The MS just tells
the EDIS unit how much advance to set, the EDIS does the rest itself.
Alternatively the MS usint can do all the work using on board coil drivers. the V3 comes with provision for one coil driver on the board, which is
suitable for cars with a single coil and distributor. If you wish to run a distributorless system you can add another coil driver (or more depending
on no. of cylinders) but they have to be hard wired into the PCB as there is no provision made for more than one in the original design.
The EDIS has the advantage of using a well proven, automotive quality unit, which also keeps igntion currents out of the MS ECU, reducing the
possibility of interference. The downside is extra wiring, another module to mount etc. Having the coil drivers built into the MS ECU results in a
neater solution, less wiring etc.
[Edited on 30/9/07 by MikeRJ]
CaptainJosh - 1/10/07 at 08:45 AM
I think i will go with using the ford EDIS then, after doing some more reading up, it seems to be the most straightforward way of doing it- extra
wiring in the engine bay isn't a problem, and quickly solved with a few cable ties and some heat shrink
Cheers guys, you've been loads of help
-Josh
CaptainJosh - 1/10/07 at 09:30 PM
One last question-
If you run the ford edis, can you take into acount RPM in your fuel map? i.e. use the rpm signal from the edis to effect something otherthan ignition?
MikeRJ - 1/10/07 at 10:25 PM
quote:
Originally posted by CaptainJosh
One last question-
If you run the ford edis, can you take into acount RPM in your fuel map? i.e. use the rpm signal from the edis to effect something otherthan ignition?
I've not used this setup but as far as I know the PIP output from the EDIS is wired into the crank sensor input of the megasquirt so it derives
all it's timing information from the EDIS output.
chriscook - 2/10/07 at 08:36 PM
This is correct. Depending on your tacho you may also be able to use one of the EDIS pins (CTO) to drive your tacho.
quote:
Originally posted by MikeRJ
I've not used this setup but as far as I know the PIP output from the EDIS is wired into the crank sensor input of the megasquirt so it derives
all it's timing information from the EDIS output.