DDK - Die Deutschen Klassiker

Hello All, so I’m running a twinplug setup Perma Tune in my 914.
The other week I was getting a bad miss fire and was hard to find the problem as it ticked over fine but under load you could feel it missing.
So I was thinking of adding 2 isolating switches to each 3 pin box. So I could just turn off the top or bottom. The boxes are not fixed in the easiest place too just pull off the connectors.
Anyone else done this ? If so is it just a simple case of adding a switch in between the ignition live wire before it reaches the box?

Your thoughts please
Best regards Mark.

There was this on the Pelican Forum some time ago..........which had updates from Permatune themselves and how bad earths can cause issues, may be worth a read if any help?
Ian


http://forums.pelicanparts.com/porsche- ... ion-4.html

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Only just seen your question Mark.

I've used dash-mounted (Bosch) pull switches to isolate the ignition circuits on each of the twin-plug engined cars I've owned.

The last one was my 904 replica in which I utilised 2 x MSD boxes & 2 x ignition coils - the dash switches being wired in the feed from the ignition switch to each coil.

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Lightweight_911 wrote:.

Only just seen your question Mark.

I've used dash-mounted (Bosch) pull switches to isolate the ignition circuits on each of the twin-plug engined cars I've owned.

The last one was my 904 replica in which I utilised 2 x MSD boxes & 2 x ignition coils - the dash switches being wired in the feed from the ignition switch to each coil.

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Thanks Andy,
Yes I contacted Perma Tune who were very helpful and fast to respond.
So a couple of switches are ordered and they recommend to put a diode in-line between the cdi boxes and the dizzy.

Many thanks
Mark.