FYI, If you install an MSD tach adapter the stock ecu will still think its connected to the coils.
Interesting... I guess there is enough resistance there to fool the ECU. I guess one should assume to splice AFTER the MSD though for their spark.
Having the MS control the coils is no different (in the view of the stock ecu) as installing an MSD. Since the ECU is not directly connected to the coils you need something in there to simulate a load.
FYI, If you install an MSD tach adapter the stock ecu will still think its connected to the coils.
Interesting... I guess there is enough resistance there to fool the ECU. I guess one should assume to splice AFTER the MSD though for their spark.
Having the MS control the coils is no different (in the view of the stock ecu) as installing an MSD. Since the ECU is not directly connected to the coils you need something in there to simulate a load.
interesting....before I had the MS installed I had a friend working on(about to install) a coil system much like he has on his cavalier. We did some testing and everything works, but never had the chance to finalize everything. I dont know how he did it, but he had it where we had a individual coil pack per cylinder. If it worked properly like it should then I would go ahead and order some msd coils(not the same kind they sell for our cars) and install those. That was in my mind the ultimate ingnition upgrade by having an individual coil for each cylinder....I just gotta get him back to finish it. He is currently heavy into his own work at the moment though.
FYI, If you install an MSD tach adapter the stock ecu will still think its connected to the coils.
Interesting... I guess there is enough resistance there to fool the ECU. I guess one should assume to splice AFTER the MSD though for their spark.
Having the MS control the coils is no different (in the view of the stock ecu) as installing an MSD. Since the ECU is not directly connected to the coils you need something in there to simulate a load.
WHAT? lol
A tach adapter doesn't control the coil at all. It simply reads resistance in the voltage to calculate RPM.
I think what shawn is trying to say, unless I am reading his statement wrong, is that if you have a tach driver and leave it connected to your factory wiring, it wont set off a code causing your injectors to missfire.
I don't really see the point of it in the first place, since the ASD is bypassed and have no control in the first place.
BTW... is anyone out there running an independent spark harness such as myself, giving the coil a direct 12v source rather than the PCM source?
A tach adapter doesn't control the coil at all. It simply reads resistance in the voltage to calculate RPM.
I think what shawn is trying to say, unless I am reading his statement wrong, is that if you have a tach driver and leave it connected to your factory wiring, it wont set off a code causing your injectors to missfire.
I don't really see the point of it in the first place, since the ASD is bypassed and have no control in the first place.
BTW... is anyone out there running an independent spark harness such as myself, giving the coil a direct 12v source rather than the PCM source?
Correct. When you install an MS or an MSD DIS-2 the stock ecu is no longer directly connected to the coil pack and it will set a code because it does not sense the load of the coil. The tach adapter is just a big coil that connects to the ecu to simulate that load. You're also right that it really doesn't matter but if you wanted to not set a code for emissions reasons or wanting to read spark retard with an obd-II scanner it might help. Then again, it might not.
A tach adapter doesn't control the coil at all. It simply reads resistance in the voltage to calculate RPM.
I think what shawn is trying to say, unless I am reading his statement wrong, is that if you have a tach driver and leave it connected to your factory wiring, it wont set off a code causing your injectors to missfire.
I don't really see the point of it in the first place, since the ASD is bypassed and have no control in the first place.
BTW... is anyone out there running an independent spark harness such as myself, giving the coil a direct 12v source rather than the PCM source?
Correct. When you install an MS or an MSD DIS-2 the stock ecu is no longer directly connected to the coil pack and it will set a code because it does not sense the load of the coil. The tach adapter is just a big coil that connects to the ecu to simulate that load. You're also right that it really doesn't matter but if you wanted to not set a code for emissions reasons or wanting to read spark retard with an obd-II scanner it might help. Then again, it might not.
I'm comfused. The MSD tach adapter I installed went inline on the +12v to the coil. The +12v comes from the ASD which is not monitored by the PCM. The coil grounds from the PCM are the only thing I know of which could be monitored...
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LoL when I get home I will turn the key on and write them all down. If you dont see something up here by 7pm-8pm then shoot me a text msg and make sure I go out and do that. I have to also try and find the resistor for casper so I can take a picture of that.
So I figured I that I would be able to just reload the proper s19, copy the NGC3 MSnSE file to Megatune, reinstall and continue where I left off. Nope. I get everything back in and the car runs on only cylinders 2 and 3. WTF??? My wiring is exactly the same as it was before when it was running on the old MS unit and I had gone through my settings in Megatune several times before and after the install. I confirm that there is power is getting to the injectors and spark going to 1 and 4. I also confirm that the MS is grounding the injectors properly with the Stim and the MS also reads rpm perfect both on the Stim and on my car. This thing is just blowing my mind right now and honestly doesn't make sense. I'd post my msq, but my new laptop just got the blue screen of death. Any ideas? Could it be the new MS I got from RS? Could I have loaded a corrupt file onto the MS?
I just loaded the NEW NGC3 code in, and quite similiar to your problems, it seems like its running on 2 cylinders. When it gets a lil cooler out today, im gonna put the older code back in and see if it runs better
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Any ideas? Could it be the new MS I got from RS? Could I have loaded a corrupt file onto the MS?
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