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Re: msd ignition woes
[Re: sshemi]
#1511202
10/02/13 03:48 PM
10/02/13 03:48 PM
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Joined: Jul 2006
Posts: 4,179
California
mickm
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OP
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Joined: Jul 2006
Posts: 4,179
California
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Quote:
- isolated the wires to the distributor from the MSD box
Exactly how did you do this?
to answer the last two posts, we took an existing MSD harness and completely wired it up, bypassing every single wire on the car having to do with the MSD box. power and ground went straight to the battery, all wires were routed through the front of the grill to avoid every possible contact with any existing wire whatsoever.
not sure how much more isolated it could be.
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Re: msd ignition woes
[Re: mickm]
#1511204
10/02/13 03:52 PM
10/02/13 03:52 PM
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Joined: Jul 2006
Posts: 4,179
California
mickm
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OP
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Posts: 4,179
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ok, latest.
- dual point distributor.
- napa replacement coil.
- MSD box powering the system, i.e. white wire from the MSD box to the lead on the distributor, coil wires from the MSD box hooked up to the coil.
we have our raped ape back again, except that the rev limiter is set at 6500, and it seems to kick in about 6100, which was what i saw when i first put the box in, (with the electronic ignition and MSD coil, and in neutral).
so, i'm not sure what that points to exactly.
next step:
- try the MSD coil.
- if it doesn't work, try it vertically mounted instead of horizontally mounted, just to be sure.
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Re: msd ignition woes
[Re: dogdays]
#1511205
10/02/13 03:53 PM
10/02/13 03:53 PM
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Joined: Jul 2006
Posts: 4,179
California
mickm
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OP
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Joined: Jul 2006
Posts: 4,179
California
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Quote:
You can check out if it's RFI by eliminating the electronic pickup. Trigger the box with a point-type distributor using the white wire. I bet your problem disappears immediately.
Then you can figure out where the RFI or EMI is coming from.
R.
ok, you answered the question of my latest post before i posted it.
so how do i figure that out?
first step looks to be resistor plugs. what after that?
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Re: msd ignition woes
[Re: mickm]
#1511207
10/02/13 04:28 PM
10/02/13 04:28 PM
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Joined: Jun 2006
Posts: 5,192
CT
GTX MATT
master
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master
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Posts: 5,192
CT
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Quote:
ok, latest.
- dual point distributor.
- napa replacement coil.
- MSD box powering the system, i.e. white wire from the MSD box to the lead on the distributor, coil wires from the MSD box hooked up to the coil.
we have our raped ape back again, except that the rev limiter is set at 6500, and it seems to kick in about 6100, which was what i saw when i first put the box in, (with the electronic ignition and MSD coil, and in neutral).
so, i'm not sure what that points to exactly.
next step:
- try the MSD coil.
- if it doesn't work, try it vertically mounted instead of horizontally mounted, just to be sure.
Its the plugs
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: msd ignition woes
[Re: GTX MATT]
#1511208
10/02/13 04:37 PM
10/02/13 04:37 PM
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Joined: Jul 2006
Posts: 4,179
California
mickm
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ok. i just got off the phone with Pat Collins at TechWest Racing. he emphasized over and over and over again that i should stop what i'm doing, the problem is not in the car, the problem is in the box. he described the exact problems i'm having, and specified the chips in the box that are the problem, (chips that are not over the counter, and MSD doesn't release). he said he has migrated many people away from this box, and suggested that if i want to keep the same basic setup, to get the older analog version, the 6ALN. so at this point i will try a set of resistor plugs, but i'm done. i'm going to do the best i can to get a refund on the latest box i bought from MSD, try and get a 6ALN, and take things from there. i'll post whenever i have something new. thanks to everyone for contributing here, the help has been awesome! 
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Re: msd ignition woes
[Re: rickraw]
#1511210
10/02/13 04:50 PM
10/02/13 04:50 PM
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Joined: Jul 2006
Posts: 4,179
California
mickm
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OP
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Joined: Jul 2006
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Quote:
Cudadon asked if ur still using the ballast resistor. Msd say's don't use one. U never mentioned if u have one wired in.
sorry, missed that. we have bypassed it.
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Re: msd ignition woes
[Re: jamesc]
#1511213
10/05/13 08:36 PM
10/05/13 08:36 PM
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Joined: Jul 2006
Posts: 4,179
California
mickm
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OP
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ok, it's conclusive: i have 2 bad MSD boxes.
pat explained that the issue was in the rev limiting chips, that they were wildly inaccurate, causing exactly the problems i'm seeing.
we already had the points distributor back in, and so took it for a ride, and it behaved better, (was hooked to the MSD box), but still wasn't great, cutting out around 6k, where it used to cut out pretty badly around ~5600. finally had the idea to up the rev limiter, and so set it at 8500 or so. took it out and it ran great, well past 6500 and still going strong.
put the mopar electronic distributor and the blaster coil back in, and it ran the same, fantastic.
so it's the box and it's rev limiter circuits.
now i just have to see if i can get a refund for these boxes...
Last edited by mickm; 10/05/13 08:51 PM.
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Re: msd ignition woes
[Re: mickm]
#1511215
11/29/13 06:31 PM
11/29/13 06:31 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Anytime I have a issue with a MSD box, the FIRST thing I do is pull ALL of the rev chips out... 99% of the time the problem goes away... but I also start off with resistor plugs and wires so it doesnt hurt the box 
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Re: msd ignition woes
[Re: MR_P_BODY]
#1511216
11/29/13 06:55 PM
11/29/13 06:55 PM
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Joined: Jul 2006
Posts: 4,179
California
mickm
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OP
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Quote:
Anytime I have a issue with a MSD box, the FIRST thing
I do is pull ALL of the rev chips out... 99% of the
time the problem goes away... but I also start off with
resistor plugs and wires so it doesnt hurt the box
you mean you physically open the box and pull the chips out? that is one of the reasons i want the box, is for the rev limiter.
my last box worked, if i set the limiter to about 7800. doesn't do me much good up there though, that's not going to help me on a missed shift...
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Re: msd ignition woes
[Re: mickm]
#1511217
11/29/13 07:39 PM
11/29/13 07:39 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
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Posts: 52,972
Romeo MI
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Quote:
Quote:
Anytime I have a issue with a MSD box, the FIRST thing
I do is pull ALL of the rev chips out... 99% of the
time the problem goes away... but I also start off with
resistor plugs and wires so it doesnt hurt the box
you mean you physically open the box and pull the chips out? that is one of the reasons i want the box, is for the rev limiter.
my last box worked, if i set the limiter to about 7800. doesn't do me much good up there though, that's not going to help me on a missed shift...
No I dont open the box... just plug in a 2 or 3 step
in the port and it by-passes the internal limiter..
then just dont put any chips in the 2 or 3 step box..
at least thats the way on a 7AL
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