Dwell time is the maximum time the ecu calculates to start to charge the coil before the ignition event needs to take place. Its not to hard to understand or setup with the right equipment..... Think of an engine rotating at 6000rpm a min. Thats 3000 power cycles a min. Thats 100 x (360 deg) rotations every second. (or 50 power cycles) Or on a 6 cylinder 3000 power cycles (6000 rpm) wich will have 18000 ignition events every minuite. (300 a second) With a stroke length of 86mm thats 86x100/2 (devide by 2 because one rotation has 2 strokes) = 4300mm a second or 4.3mm every millisecond. Now, the crankshaft moves at 100 x 360deg a second, so in 1/1000th of a sec the crank will move .36 degrees. Why all this you ask... Well when you are setting up an inductive ignition system .36 degrees of crank rotation is the time it takes for 1ms, so 4 would be 1.2 degrees. Now the computer needs to calculate how long before it needs to start charge the coil before the ignition event takes place. So if the coil needs 2ms to charge the coil it needs to close the module .72 degrees before the ignition event takes palce to ensure its fully charged by the time the tuner wants the spark plug to fire. How long is correct? well that depends on a few factors like the quality of you charging system, The quality of your system earths and the specifications of your coils. They can saturate a lot quicker at 14V than 11.5V and also if you have poor battery earths or you battery is in the boot and isnt eathed correctly then for the spark plug to fire, it has to find a good enough earth to create the spark. I have had cars on the dyno for 5 min, couldnt run anything leaner than about 14:1 AFR and diagnosed poor earths wich reasulted in poor ignition system. I got a jumper lead and clipped one end to the body of the car one one to the engine block and it ran smooth. The car in question had the battery in the boot and was earthed to the body. It had a tiny earth strap from the engine to the body and that was it. So every time the coil fired the plug, for it to earth it had to run 20amps of current through this tiny little strap, all the way to the boot, to the battery. Not cool and a problem more common that people realise. I have just rescently tunned a development CA18 wich is making 414rwhp on pump, Running at 8200rpm with a standard ecu and standard nissan coils. Remapped by me. This is with standard copper plugs and 0.8 gap. There is no ignition booster just correct coil charge times and good wiring. I still dont think this is a component issue, more of a setup one. (Hyped6)

Any updates?

Nah not yet, been busy this week, Im trying to get it on the dyno next weekend so we can spend some time with it, there are a few other issuse that need some sorting aswell. Thanks to every one who has helped, got a long list of things to try first before I ditch the ICE gear.