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MSD box install question

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Old Sep 4, 2016 | 07:04 PM
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Default MSD box install question

Ok the msd instructions clearly show how to use a box with the large cap efi HEI. But I've already switched to an aftermarket Accel control module from another tpi car I had.

Would you switch back to the stock module or leave the Accel in?

No, do I need msd debates plz, it's a S/S car n I wanna add nitrous sooner or later.
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Old Sep 4, 2016 | 07:14 PM
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Originally Posted by BOOT77
Ok the msd instructions clearly show how to use a box with the large cap efi HEI. But I've already switched to an aftermarket Accel control module from another tpi car I had.

Would you switch back to the stock module or leave the Accel in?

No, do I need msd debates plz, it's a S/S car n I wanna add nitrous sooner or later.
If the accel part is a direct replacement for the GM part I would think the pins have the same function.
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Old Sep 4, 2016 | 07:16 PM
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It's not a direct, it's suppose to have more dwell or w/e

edit: https://www.holley.com/products/igni...ts/parts/35363

Last edited by BOOT77; Sep 4, 2016 at 07:41 PM.
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Old Sep 5, 2016 | 01:30 PM
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Originally Posted by BOOT77
It's not a direct, it's suppose to have more dwell or w/e

edit: https://www.holley.com/products/igni...ts/parts/35363
A very minor consequence and suspect more advert noise than fact. Dwell happens before the spark not after. BTW longer the dwell the lower the rpm available.
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Old Sep 5, 2016 | 06:38 PM
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Originally Posted by BOOT77
Ok the msd instructions clearly show how to use a box with the large cap efi HEI. But I've already switched to an aftermarket Accel control module from another tpi car I had.

Would you switch back to the stock module or leave the Accel in?

No, do I need msd debates plz, it's a S/S car n I wanna add nitrous sooner or later.
If the MSD box is a CD (correct me if that's a wrong assumption) then it's academic which module you use (although I would have infinitely more confidence in the long term durability of the DELCO module versus an aftermarket module).

Just curious: What's w/e in your later post?
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Old Sep 5, 2016 | 07:04 PM
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Originally Posted by 69427
What's w/e in your later post?
w/e = What Ever
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Old Sep 5, 2016 | 08:29 PM
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^^^^^ what he said

Yah thinking gonna go back to gm and then I can sell the Accel to someone looking for more dwell.

Last edited by BOOT77; Sep 5, 2016 at 08:29 PM.
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Old Sep 6, 2016 | 12:27 AM
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I'm running a MSD 6AL digital box with a large cap HEI distributor. I have always run an ACCEL control module, before and after the MSD box. I have no problems.
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Old Sep 6, 2016 | 01:02 AM
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Hey BOOT; When you get the thing installed, could you measure the voltage on the "+" side of your ignition coil while it's running?
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Old Sep 6, 2016 | 02:08 AM
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Originally Posted by Tom400CFI
Hey BOOT; When you get the thing installed, could you measure the voltage on the "+" side of your ignition coil while it's running?
Oooooo you are mean should be around 450V
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Old Sep 6, 2016 | 09:35 AM
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That's what I've heard, but I'd like someone to confirm that, if possible. Someone said they would in another thread, but never did.
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Old Sep 6, 2016 | 11:29 AM
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I once had a friend who use to test for spark on his old mustang by just holding a screwdriver in the plug wire and feeling it. Then when another friend had a trans am with HEI we tried to tell him not too, but he insisted. That screwdriver ended up in my wall next to another friends face.
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Old Sep 6, 2016 | 01:42 PM
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Copy that. I'm not asking you to check that voltage; I'm asking if you would check the primary voltage at the coil....
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Old Sep 6, 2016 | 02:06 PM
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Originally Posted by BOOT77
I once had a friend who use to test for spark on his old mustang by just holding a screwdriver in the plug wire and feeling it. Then when another friend had a trans am with HEI we tried to tell him not too, but he insisted. That screwdriver ended up in my wall next to another friends face.
lol

Try that with a modern DIS system and you might as well tazer yourself.
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