Cylinder numbering?

On my 348 the cylinders are numbered as such:

Front of car
---------------
| (8) | | (4) |
| (7) | | (3) |
| (6) | | (2) |
| (5) | | (1) |
---------------
Rear of car

If you were to lay the coils down with the plugs laying facing up they order is:

for bank 1-4 (right side looking in from the rear)
1,2
4,3
^
wiring loom connector

for bank 5-8 (left side looking in from the rear)
7,8
6,5
^
wiring loom connector

I don't know for sure if it's the same for a 355, but it could be. Hope this helps?

 

I do think that, even on a 348, the numbering is the following:

Front of car
---------------
| (8) | | (1) |
| (7) | | (2) |
| (6) | | (3) |
| (5) | | (4) |
---------------
Rear of car

With a " 1 - 5 - 3 - 7 - 4 - 8 - 2 - 6 " firing order, it balances the firings left/right but also front/rear.

 

Hi Johan

I followed the coil-on-plug conversion thread even before I took delivery of my 355. I was very interested on it but have always been concerned by the need to connect 2 coils together whatever it is in serie or in parallel. Depending on the balancing of the coils it may works well or ... not so well.
I do prefer your AEM solution and, starting with the 8 cylinders diagram, I think the only change you have to implement is to connect together, on each side, the white and yellow wires then the green and violet wires. So you have only 4 inputs to connect to the Motronic, triggering the coils in a wasted spark mode and in such a way that the coils which are fired simultaneously do not share the same capacitor.
Also, I think that it would be better to use two 4-channels modules because they can be installed exactly where are the original coils, minimizing the harness work.
One thing which is not clear in their documentation, is the capability of the system to fire an engine in the wasted-spark mode at 8600 RPM. Indeed, each coil and each capacitor are triggered 2 times more per cycle, so as often as on an engine at 17200 RPM in normal mode (single spark per cycle). That seems to exceed their 14000 RPM limit.

 

OH CRAP!!!

You are totally correct! Thanks for catching that Eric, and for correcting my mistake.

I'll go sit in the corner now with a dunce hat on. LOL!
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That is the direction I'm going, once I actually start this project.

 

Friend of mine is a certified AEM tech and dealer. If you think we can somehow sneak this to you under the radar, I can have him check prices.

 

You are now the honorary "Sparky" of the Stooges. Plugzit, you are relieved.

 

lol...that pic is hilarious.

 

No problem, I need a pair too so I'll see if I can get a quantity discount

It may not be until Monday due to the holiday weekend until I talk to him.

 

Havind read their documentation, I am not really sure anymore that the original coil area is the best place. It is written that the system does not like the engine bay environment, and we all know how it is around a 355 engine. OE coils are above the headers, any piece of electronics will have a very hard time there. The extreme rear corners of the car are probably better, but not as good as close to the motronic. Harness work from the rear corners is still easy, from the motronic it is much more demanding and I don't know if the length of the wires between the module and the coils would be acceptable.

 

I'll be at the dyno with the 355 tomorrow, should have a price on the AEM box.

 

Sorry, I am just getting on to this "box" issue.
What is AEM? Is that an alternative to MSD?
And, if so, what makes one better than the other? Thanks