Mustang Posted June 28, 2020 Report Share Posted June 28, 2020 have to install a Atom G4x on a Porsche 944, Customer wants wasted Spark Igntion. Is it possible to use the Porsche 944 Trigger Mode ( 132 teeth trigger and 1 sync on crank ) for wasted Spark Ignition? Thanks Marc Quote Link to comment Share on other sites More sharing options...
Vaughan Posted June 28, 2020 Report Share Posted June 28, 2020 yes it is, it isn't possible to do direct spark without adding a cam trigger signal though. Quote Link to comment Share on other sites More sharing options...
Mustang Posted June 28, 2020 Author Report Share Posted June 28, 2020 Vaughan, just to be sure and for future Porsche 944 projects, if i want to run direct spark & seq. Injection i can use the Porsche 132 teeth Crank Trigger and add a Cam Sync Sensor. Trigger Mode = Multi - Tooth, Multi Tooth Postion = Crank Tooth Count = 132 Sync Tooth = 1 Trigger 2 / Sync Mode = Cam Pulse 1x Correct? Thank you Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 28, 2020 Report Share Posted June 28, 2020 No, you wont be able to use the 944 flywheel trigger for sequential with a cam sensor. The stock system has two sensors on the flywheel, one that senses every starter tooth and another that sees a single tooth once per rev. Because they are both on the flywheel the mechanical relationship between them is fixed. The reason you cant swap to a cam sensor for the single sync tooth is there will be too much mechanical play between the crank and cam teeth. With 132 teeth that is only 2.7deg between teeth. So you only can have about +/-1.5deg "back lash" in all the cam drive system before the cam tooth would occur at a different crank tooth count. For sequential you will need to change to something more conventional. I believe there are a few companies that offer 36-1 crank wheel kits for the 944. Also, from experience, you need to make sure the flywheel teeth are in perfect condition all the way around before getting too committed. I have seen a few guys struggle with these over the years and it has always been due to a patch(s) of worn teeth on the flywheel. Quote Link to comment Share on other sites More sharing options...
Mustang Posted June 28, 2020 Author Report Share Posted June 28, 2020 Adamw, Thanks for your answer, good advice. You are very correct about the worn flywheel teeth, a old problem i am fighting with for 30+ years. I have my own Porsche 944 / 60-2 Flywheel kits, a Pulley mount 60 - 2 Trigger Wheel and a 60-2 Flywheel, same as the Porsche 968 / 60-2 Flywheel but for use with the larger dia. Porsche 944 Turbo Clutch. Reason for asking is that i was looking to use the stock Flywheel for a cheapo Customer who don´t want to buy my one of my Trigger Kits. 928sg 1 Quote Link to comment Share on other sites More sharing options...
DME Posted April 29 Report Share Posted April 29 Hello everyone, I would like to raise the topic of 944 triggers again. Thank you for your understanding of this. It is clear that with the original trigger (132 teeth and 1 sync on crank) no wasted sparc or full seq injection is possible. But despite the described problems with the teeth of the original 8V flywheel, should theoretically a workable configuration with the 132+1 trigger be possible ? So using the normal ignition distributor and ignition coil. I'm unsure about the correct settings for this. Regards, Frank Quote Link to comment Share on other sites More sharing options...
Vaughan Posted April 30 Report Share Posted April 30 There is a Porsche 944 (132 Crk) option in the Trigger Mode drop down list. Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 30 Report Share Posted April 30 To clarify, the Porsche 944 trigger will support distributor or wasted spark ignition and multipoint group injection, just not sequential or direct spark. Quote Link to comment Share on other sites More sharing options...
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