Swapping to VAG TFSi COP coils

[Sprocket]

Need some advice on retrofitting to VAG TFSi coils.

I currently use Denso inductive coils from a Honda CBR1000 but not sure how well these will work under boost without over driving them. I originally had severe misfire when running 50hp shot of nitrous (on a 110hp motor) that I never really got to the bottom of before the engine expired. The coils came into question not generating a fat enough spark, and it's still a concern, so, perhaps time for an upgrade.

The real question here ..... How can I drive them? I already use the stepper driver for the IAC valve and I have a full compliment of 8 IGBT's. I don't really want to have to remove any if I really really don't have to. Could I invert the output and use a pull up to 12v, if I only power the coils (as I already do) and the 12v pull up from the main relay which is already only activated on RPM above 100rpm? I appreciate the IGTB is 'normally open' whe the V3 is powered down and the 12v pull up would want to drive the coil which is a BAD thing.

All opinions valued :)

Sprox

[Sprocket]

OK then........ :(

Looks like i'm modifying a new box for logic level. Any easy advice on that while i trawl throught the Wiki?

[gunni]

Simply remove the transistor and bridge the output and signal to the transistor.

You can also use a optical driver stage, i.e when you turn the transistor on it it turns on a LED inside a chip, the chip activates a photosensor which outputs the desired 5v signal, i have done it once before and it works a treat, this way the two circuits are isolated completely.

[Sprocket]

OK Great thanks Gunni.