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Thread: Wasted Spark fitting instructions?

  1. #1
    Pit Crew Decade Plus User MegatronUK's Avatar

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    Wasted Spark fitting instructions?

    Does anyone have a PDF of the Motorsports Developments wasted spark kit fitting instructions?

    Got my ecu in front of me ready to fit the driver board and realised that I've lost the paperwork for it!

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    Re: Wasted Spark fitting instructions?

    Got a replacement PDF install guide from MSD. Driver board now installed in ecu

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    Spanner Monkey Ianbavs's Avatar

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    Wasted Spark fitting instructions?

    Hav u got this wasted spark sorted any probes with the Rev counter ?


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    Re: Wasted Spark fitting instructions?

    Not running yet (still on with interior electrics!), but I'm using a Stack rev counter and not the original Ford pod, so would assume it should be fine.

    I got a custom loom made by Motorsports Developments - the fitting guide indicates two methods of connecting the rev counter (both wires are in the loom to use based on your choice). So this may indicate a potential issue with one or more rev counter types.

    Here are the instructions I was supplied:

    Click image for larger version Name:	driver_board_fitting.jpg Views:	133 Size:	82.2 KB ID:	79373

    Click image for larger version Name:	driver_board_fitting_2.jpg Views:	136 Size:	103.5 KB ID:	79374

    Click image for larger version Name:	tacho_mod.jpg Views:	135 Size:	65.1 KB ID:	79375

    Click image for larger version Name:	tacho_mod_2.jpg Views:	135 Size:	56.3 KB ID:	79376

    Click image for larger version Name:	tacho_mod_3.jpg Views:	135 Size:	43.4 KB ID:	79377

    My loom was supplied with 3 connections; a single wire suitable for most rev counters, as well as 2 connections to use with diodes as per the alternative instructions above.

    Hoping it should be running within a few weeks.

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    Wasted Spark fitting instructions?

    Cool my rs2000 Rev counter works as is but still hav strange misfire occasionally when just cruising along but it's ok when booted 🤔


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    Wasted Spark fitting instructions?

    The misfire was caused by my Rev counter connected to the md circuit board for wasted spark :-) disconnect the Rev counter pin 9 or 21 I think and runs fine now so will make up the diode cct and run it from the coil pack side :-)


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    Wasted Spark fitting instructions?

    Diode cct only works to 1200rpm then dies lol
    May add few resistors cos I think the -ve pulses are not going low enough to fire the Rev counter 🤔


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    Spanner Monkey Ianbavs's Avatar

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    Wasted Spark fitting instructions?

    It worked but needs refining 🤔


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    Re: Wasted Spark fitting instructions?

    Just fit a 10k resistor across the rev counter connections on the back of the dash, this will get rid of the rev counter going nuts. You don't want or need any resistors inline between your diodes and the rev counter.

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    Wasted Spark fitting instructions?

    Between Earth and the signal from the coils then u mean cheers


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    Spanner Monkey Ianbavs's Avatar

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    Wasted Spark fitting instructions?




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    Wasted Spark fitting instructions?

    Mine was like this, sorry, was a 5k resistor I used, not 10k




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    Wasted Spark fitting instructions?

    Ok thanks was that running msd wasted spark with 2 diodes connected together to get a single output connected to Rev counter cheers


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    Re: Wasted Spark fitting instructions?

    Yes, exactly as you have your diagram with the two diodes and one zener. I had the exact same issue as you, rev counter would work, but as soon as it went over 2k it would go funny, then just drop to nothing.

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  16. #15
    Spanner Monkey Ianbavs's Avatar

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    Wasted Spark fitting instructions?

    Thanks for that will giv it a try :-)
    Cheers 😁


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