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upgrade from distributor ignition to coil on plug

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Hi,

i want to upgrade my ignition system to coil on plug. My ecu has outputs with internal power stages.

So i think i could use coils with or without transistors.

But somehow i need advice. Which are the pros and cons weather i use coils with or without transistors?

Somehow i don't want to drive so much current throug my ecu and want to keep it cool...........so now i think that using coils with transistors would be the better solution.

Maybe someone can explan more and give me more background knowledge.

Thx

Which goal are you aiming to achieve with this upgrade to COP? Is it all about the ECU temperature?

Presumably the reason who there was no reply on your post so far is due to the lack of precise information about the current engine management system, the ECU's make and type (also presumably OEM) and the meaning behind the question regarding the "transistors" for / in the coils is unclear. I assume you are referring to coils with integrated ignitors. If you word your question more precisely there will most likely be useful feedback on it.

German Comment:

<

Welches Ziel beabsichtigst Du mit diesem Umbau zu erreichen? Geht es lediglich um die Steuergeraetetemperatur?

Wahrscheinlich liegt der Grund weshalb bis anhin niemand auf Deine Frage geantwortet hat darin, dass Du in Deiner ersten Nachricht zu wenig konkrete Angaben ueber das Motorsteuergeraet, dessen Herkunft (Serie vermutlich?) und die Frage bezueglich der Zuendspulen schwierig zu interpretieren ist. Ich nehme an, Du meinst damit Spulen mit intergriertem Zuendschaltgeraet. Wenn Du Deine Frage praeziser formulierst, so bin ich zuversichtlich, dass Du auch entsprechendes Echo erhaelst.>

Thx Dynodom,

first of all yes sure you are right.....but english is not my mother tongue. Also all the technical words.............in germany there sadly are not so much resources where i could information from.

So my target is to upgrade my ignition system(its an m20 bmw engine). I already did an upgrade from single coil distributor ignition to wasted spark. But the wasted spark has with my ecu (ecumaster emu) some disadvantages. I can't set variable injection angle for example and have to squirt twice per engine cycle. This is because ecu don't know if engine is in power or exhaust cycle.

So now i will ad an cam sensor and want to switch to COP simultanously to have full sequential ignition and injection and have the possibility to define the injection angle with one table depending to rpm and load.

To make the right decision i asked about the coils.........should i use some with or without integrated ignitors and whats are the differences advantages or disadvantages.

Also when someone has some resourcces where i can get information from it would help.

Thx

Hi there bmwmaster, I am certain you will get useful replies on this now. The message is understandable. There are many people who's mother tongue is not English including myself.

I have found that the posters here are very helpful and it doesn't matter if we make linguistic mistakes as long as the message comes across.

I already did an upgrade from single coil distributor ignition to wasted spark. But the wasted spark has with my ecu (ecumaster emu) some disadvantages. I can't set variable injection angle for example and have to squirt twice per engine cycle. This is because ecu don't know if engine is in power or exhaust cycle.

Do you know that you do not need to fire the injectors in batch fire whilst using wasted spark? You can fire the spark in an empty cylinder

In reality, either option will work well for you. I normally prefer could with built in igniter modules as this means I don't have the complexity of wiring an external igniter. If your ECU can directly drive a cool that requires external igniters then it makes no real difference. I'd be looking more at what coils are available for a reasonable cost, and which are going to be easiest to fit and make your decision based on this.

One point that probably isn't relevant to you but I'll mention anyway, is that you can't use a CDI ignition with internal igniter coils. These require a dumb coil with no built in igniter.

Thx for support..........I think you are right. I use coils with internal igniters and make it as simple as possible.

"Do you know that you do not need to fire the injectors in batch fire whilst using wasted spark? You can fire the spark in an empty cylinder"

Yes im running the injectors in full sequential mode now. The disadvantage in my actuall setup without cam sensor is that i can't set a proper timing when the injection happens. ECU doesn't know if it is in combustion or exhaust stroke. So instead of injecting in complete wrong time window, i set it up to inject twice! In this mode at least one injection is right.

In high rpm this doesn't matter much but in idle and low load and rpm it could be better with camsensor and right injction timing.

<< ECU doesn't know if it is in combustion or exhaust stroke. So instead of injecting in complete wrong time window, i set it up to inject twice! In this mode at least one injection is right. >>

This is not critical. The injector sprays on the back of the valve, or directly into the cylinder on the intake stroke, or both of it. Just make sure the mixture is correct. Moving the injector end angle back and forth may or may not give better idle quality and a small amount of torque change in reality the changes are to be expected fairly small.