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MSD ignition question

 
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Old 04-15-2015, 07:22 PM
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MSD ignition question

My H22a1 donor motor came with a MSD ignition(MSD 6AL) and I'm finding out today that it should of came with a Tach adapter? At least that's what I'm reading on the MSD website.

If, after installing an MSD Ignition Control, your ta*chometer, fuel pump relay or electronic fuel injection (in foreign vehicles) doesn’t operate correctly, your ap*plication may require a Tach Adapter. This is due to the trigger signal not being strong enough to trigger both the MSD and the factory’s components.There are a few Tach Adapters available and for more information see pages 152 and 153. Each Adapter is simple to wire in and will have your MSD and vehicle firing away in no time! If you are triggering an MSD Blaster, 5, 6, SCI, or 7 Series Ignition with its white wire or points terminal, you will need the PN 8910 Tach Adapter. The PN 8910 will correct the operation of most voltage-triggered tachometers or fuel injection systems that do not work directly off the tach output terminal of the MSD Ignition Unit.



Anyone else using this MSD system and running such item? I think my no start problem(Main Relay No start back up symptoms) has turned into a "WTF am I really missing here" kind of a problem gents lol.

Any input/guidence would be nice!
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Old 04-21-2015, 11:50 PM
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Re: MSD ignition question

From what I gather, a tach adapter is only to boost the RPM pickup so that you can continue using the OEM RPM gauge, right? Meaning, you should still be able to start, drive and park the car without it, you might just not be getting a strong enough RPM signal without it.

In our cars though, isn't the RPM read off the VSS? If so, I don't see where you'd benefit having one of these things.
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Old 04-22-2015, 06:29 AM
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Re: MSD ignition question

I'm pretty sure the tacho reads directly off the distributor, specifically the ICM. A funky ICM could possibly explain your no-ignity problems. Is the tacho actually reading funny?

So I'm struggling to understand the MSD system fully, I thought it was simply a multi-spark coil that fires more often than the stock coil. I found a write-up here though NTPOG 5th Gen Ignition Installation. Did the system you have replace the ICM also?

I get the feeling that is just a generic disclaimer so that MSD can take no responsibility if the tach does go out.
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Old 04-28-2015, 03:34 PM
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Icon14 Re: MSD ignition question

Sorry for the late reply's.. life and such.


Quote:
Originally Posted by Lindso View Post
From what I gather, a tach adapter is only to boost the RPM pickup so that you can continue using the OEM RPM gauge, right? Meaning, you should still be able to start, drive and park the car without it, you might just not be getting a strong enough RPM signal without it.

In our cars though, isn't the RPM read off the VSS? If so, I don't see where you'd benefit having one of these things.
I wouldn't your right. That adapter would just boost a signal that it already is receiving fine. So it would be unnecessary for it.


Quote:
Originally Posted by tassievteclude View Post
I'm pretty sure the tacho reads directly off the distributor, specifically the ICM. A funky ICM could possibly explain your no-ignity problems. Is the tacho actually reading funny?

So I'm struggling to understand the MSD system fully, I thought it was simply a multi-spark coil that fires more often than the stock coil. I found a write-up here though NTPOG 5th Gen Ignition Installation. Did the system you have replace the ICM also?

I get the feeling that is just a generic disclaimer so that MSD can take no responsibility if the tach does go out.
The tacho is reading fine. I'm really leaning now at the ICM also. I have spark/fuel/air.. constant power to everything EVEN when she won't fire. The only time I don't have spark is after she runs for a distance.........

That write-up would of been really Nice when I did my motor swap a year ago LOL! I feel like a dummy now not understanding my MSD ignition system...its to simple not to.

My donor car for my motor swap came with this ignition and the dude had NO idea about anything for this poor lude. So idk really what should of been replaced as far as this upgrade? As far as I have read you don't have to change the ICM for this.
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