installing megasquirt 2 v3 help with wiring etc

[TamTom]

Need some advice on installing my megasquirt on my m42 is!
I am finding it hard to understand the type of ignition system the is has, am i right in assuming the IS has 4 independant coils?
How would this be installed in the megasquirt wiring system.
do i have an edis system i really am baffled!
anyone know where i can get a wiring schematic or diagram for the m42 engine ecu loom?

[StuBeeDoo]

Does the M42 not have 2x twin coil packs?

[GeoffBob]

I am finding it hard to understand the type of ignition system the is has

4-cylinder wasted-spark.

You will need two outputs from your MS to fire each of the twin-coils. Wasted spark works by firing your plugs at both the top of the compression and exhaust strokes (so one spark is effectively wasted). This way one twin-coil can be used to fire two cylinders. It also means that your MS doesn't need to know the exact stroke that each cylinder is on - each and every TDC gets a spark regardless. This removes the necessity for a cam position sensor (only a crank sensor is required to implement a wasted-spark ignition) which is convenient.

I know nothing about MS but if it doesn't include two ignitor circuits (to power the two coils) then you will need to purchase two ignitor circuits and trigger them from two logic outputs from the MS.

[chips]

The M42 has 4 independant coils.

I'll be watching this thread though, hoping to go MS myself in the future.

[GeoffBob]

The M42 has 4 independant coils.

I'll be watching this thread though, hoping to go MS myself in the future.

Sincerest apologies, you are quite right. The M42 includes a variable reluctance sensor adjacent to the cam sprockets. Using this signal the stock management can distinguish between TDC compression and TDC exhaust stroke.

The stock ignition system is, therefore, 4-cylinder sequential (on independent coils) rather than 4-cylinder wasted-spark.

Apologies once again.

EDIT: Tam, come to think of it you could implement a sequential or wasted-spark type ignition depending upon the complexity of the task that you want to tackle. Wasted spark would be the easiest since you would only need to interface the crank sensor to your MS. You would also only need two outputs to drive two twin-coils. Alternatively, if you can interface both signals from the cam and crank sensors to your MS then you can run a fully sequential ignition, but you will require four outputs from your MS for this.

[TamTom]

is there any benefit in running sequencial spark?
also if i want to run wasted spark for simplicity would i just take the output from the drivers on my megasquirt ecu and send a spark signal to 1-3 and 4-2 i understand how wasted spark works its just understanding how coilpacks work.
Is there a signal wire to say spark and a ground? also will the driver be ok to power the two coils the instructions say each deiver can handle 7.5 amps load!

[Alburglar]

Where can I get a copy of the MS instructions? I have just bought exactly this version MS, built into a stock M42 ecu case with stock plug socket, but want to understand it a bit better before I fit it and attempt a base map.

[chu346]

Where can I get a copy of the MS instructions? I have just bought exactly this version MS, built into a stock M42 ecu case with stock plug socket, but want to understand it a bit better before I fit it and attempt a base map.

http://www.megamanual.com/mtabcon.htm#ms2

[Gunni]

is there any benefit in running sequencial spark?

No.

[JdmFanBoy]

Clearly your out of your depth, you should of payed more attention in college. you have ruined a good car mate. Also VR6's are slow for a V6. Shoulda bought something jap. much love.

[Alburglar]

NICE!
...and constructive.

[JdmFanBoy]

I'm his mate Did it for a laugh in college today

[Alburglar]

ahh. Good. LOL.

[TamTom]

his name is the JDM pervert and he got fingered when he was younger!!!!! LOL

[TamTom]

Where can I get a copy of the MS instructions? I have just bought exactly this version MS, built into a stock M42 ecu case with stock plug socket, but want to understand it a bit better before I fit it and attempt a base map.

how did you manage to get one already wired to a m42 plug

[tim_s]

The M42 has 4 independant coils.

I'll be watching this thread though, hoping to go MS myself in the future.

Sincerest apologies, you are quite right. The M42 includes a variable reluctance sensor adjacent to the cam sprockets. Using this signal the stock management can distinguish between TDC compression and TDC exhaust stroke.

The stock ignition system is, therefore, 4-cylinder sequential (on independent coils) rather than 4-cylinder wasted-spark.

Apologies once again.

EDIT: Tam, come to think of it you could implement a sequential or wasted-spark type ignition depending upon the complexity of the task that you want to tackle. Wasted spark would be the easiest since you would only need to interface the crank sensor to your MS. You would also only need two outputs to drive two twin-coils. Alternatively, if you can interface both signals from the cam and crank sensors to your MS then you can run a fully sequential ignition, but you will require four outputs from your MS for this.

I've done both approaches mentioned here, although there's no reason to change the IS coilpack if running WS, just run 4 coil drivers. The above could be a bit misleading if you take it to mean you can run 2 outputs to run the existing coilpack, this is not the case.
WS works just fine, sequential took me a while to figure out and had to build a second VR conditioning circuit for ms, the cam sensor is a VR on the m42, hall effect on the m44 iirc.
Another option to consider is just using an edis module, that's the easiest method and potentially (imo) the most reliable. I've had an MS blow all its VB921s on a motorway run and never got to the bottom of why (no current or thermal protection :S), never used the fairchilds, found the bosches ran hot, but produced a good spark with low dwell... I've had good success in m42s on ms1 extra, ms2 extra betas and release 1 i think, not played with anything more recent.

On MS instructions, you need to get onto the megasquirt forums and do some serious learning before continuing with this!

[Alburglar]

Where can I get a copy of the MS instructions? I have just bought exactly this version MS, built into a stock M42 ecu case with stock plug socket, but want to understand it a bit better before I fit it and attempt a base map.

how did you manage to get one already wired to a m42 plug

bought it on ebay. I had to trace back some connections as one was broken, but sorted now.

[TamTom]

was this a listing for the 55 pin ecu or the actual 88pin is 175 ecu?
I am very surprised to see an m42 plug in megasquirt.
Would have saved me a lot of time with wiring etc

[Alburglar]

88pin
http://www.e30zone.net/modules.php?name ... highlight=