kiwicar wrote:mgbv8 wrote:A strobe on wasted spark will give you a shed load of error wont it??
Can someone explain this one please. . . and also why it never appears in the limited documentation with MSQ/Extra efi and tuner studio, what is the error? Why does it result in a retardation of the fixed timing in tuner studio? Even more importantly how do I get an accurately set up ignition without having to hire someone from a tuning company who is told this information? Why does it not happen with motorcycle ignition systems that are all wasted spark?
Sorry this is really beginning to hack me off all I wanted initially was accurate ignition timing and a rev counter, it looks like I can have neither despite now having spent a small fortune on the set up bought add on boxes that dont't seem to do anything and now being in position of a full test rig which in true MSQ style has no/rubbish documentation.
best regards
Mike
As far as I'm aware, the only problem with checking wasted spark with the timing light is down to some types of 'smart' timing lights - where you can dial in an advance setting. For vehicles which have no timing scale - only a TDC mark. My Krypton one with dial doesn't work at all with EDIS - but my earlier basic one works normally. I've not seen the theory behind this explained.
As regards getting an older rev counter (the type that takes its pulse from a single coil) to work with wasted spark, I'd agree it can be a pain - although I've not tried a commercial adaptor. I tried all the circuits MS gives with limited success so eventually build a new driver for my SD1 Smiths tach, which is easier to do than with some as it is a open frame unit, rather than being in a self contained case.
However, a pal got the same unit to work off EDIS by playing with pull up/down resistors on the output of the basic diode arrangement MS documents.
From the out I'd decided I didn't want to use the diodes from all four coils as it would make my EDIS loom untidy, so concentrated on getting it to work from the EDIS unit tach output. Which should be about the same as an MS3 tach output. But I do realise not all like playing with electronics as I do.
