Coilpack Replacement

[ErOR]

Hello

The time has come for me to replace the coilpacks on the 25de. I'm not keen on spending big bucks on genuine ones and the aftermarket are still quite a bit.

I'm curious if a waste spark system would work well on a stock 25de as that's my cheapest option. Obviously the car is still on stock ECU and the dwell time won't change, what happens to the spark in this situation? Is this a route I could go down?

The car will see track days and a turbo at some stage.

Just after some advice, cheers

[zoomzoom]

If you can't change the dwell through some aftermarket ECU solution, then best to stick with a stock replacement. OEM, splitfire, whatever.

I assume youre looking at ECUs if you're turbocharging the vehicle? If so then you could try an LS2 coilpack conversion. Even then splitfires make an easy drop in solution, depending on how much boost you want to run.

[Ben C34]

In my neo with less than 15 psi boost and ls coils they were fine at stock dwell . sorting the dwell fixed the spark issue at higher boost.

For an na Ls coils will be fine on stock boost. (Get it. No boost. Whatever, stock dwell and stock boost is fine, therefore stock dwell and no boost won't misfire ,)

[blind_elk]

Correct me if I'm wrong, but you can't have a waste spark ignition on a stock ECU. The ECU fires the spark, and it fires them one at a time, not in pairs.

[Ben C34]

Correct me if I'm wrong, but you can't have a waste spark ignition on a stock ECU. The ECU fires the spark, and it fires them one at a time, not in pairs.

You are wrong. It can be done. It's not the best option though. There's a guide somewhere in the net.

[ErOR]

Thanks for replies guys, I was afraid I'd have to fork out big but looks like Splifires it is.

I'm not changing ECU until I turbo the car which is down the line.

The issue with wasted spark on stock is not the firing signal (just a matter of wiring the pairs), but the dwell time. Would the spark be weaker by about half as it's proving spark for two cylinders?

[zoomzoom]

What kind of "wasted spark" are you talking about? If you have a single ignition output driving 2 coilpacks, like OEM or splitfires, then there is no degradation of the spark, it simply means that each coilpack is firing twice as often (one spark being "wasted" on the exhaust stroke)

One caveat would seem to be the difference in duty cycle between wasted and fully sequential ignition, especially when you start increasing dwell. Then there could be an argument about additional heat and the negative effects on the coil.

I run splitfires in wasted spark configuration, with 2ms of dwell. Although its perfectly fine on 13psi of boost, longevity of the coils is something on my mind. (hence keeping the dwell time down)