Msd6al rev limiter issue - Mustang Evolution

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Old 05-02-2012, 09:48 PM   #1
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Msd6al rev limiter issue

Have an 89 gt and I set the rev limiter with a 6200 rpm pill and it blows past that . Is there any way to test or calibrate the box myself. ?

---------- Post added at 02:48 AM ---------- Previous post was at 02:47 AM ----------

Or has anyone ran into this issue before ?
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Old 05-02-2012, 10:12 PM   #2
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Did you wire it correctly? It sounds like you didn't hook up the tach wire

---------- Post added at 03:12 AM ---------- Previous post was at 03:05 AM ----------

Gray wire I think
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Old 05-03-2012, 04:44 AM   #3
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No it is properly installed . And completely works except for the rev limiter
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Old 05-03-2012, 05:40 AM   #4
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What I'm truly asking is has anyone fired it up with a rpm pill and the car rev limit to
That number? Or is there like a conversion? And guy who have the boxes on their foxes what rpm pill do you use?

---------- Post added at 10:40 AM ---------- Previous post was at 10:39 AM ----------

( boxes on their foxes) I'm a poet and didn't know it. Lol
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Old 05-03-2012, 05:59 AM   #5
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Re: Msd6al rev limiter issue

The factory ECU has a rev limiter that activates at 6250 unless you have bypassed it somehow?

There is an article on testing the MSD in the Useful Info thread, but it probably does not cover the Rev Limiter. You should probably contact MSD and ask them about it. Maybe the pill is bad?
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Old 05-03-2012, 07:59 AM   #6
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What rpm pill is anyone running ? My rpms never seem to stop

---------- Post added at 12:59 PM ---------- Previous post was at 12:38 PM ----------

And what is the tach output used for or do I need to connect it?
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Old 05-03-2012, 09:29 AM   #7
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Quote:
Originally Posted by bigcolt45
What rpm pill is anyone running ? My rpms never seem to stop

---------- Post added at 12:59 PM ---------- Previous post was at 12:38 PM ----------

And what is the tach output used for or do I need to connect it?
That's what I wrote to you about, the tach output wire signals the rev limiter signal
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Old 05-03-2012, 10:15 AM   #8
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What do I connect it to?

---------- Post added at 03:15 PM ---------- Previous post was at 03:14 PM ----------

The gray wire at the distributor?

---------- Post added at 03:15 PM ---------- Previous post was at 03:15 PM ----------

And how?
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Old 05-03-2012, 10:52 AM   #9
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Re: Msd6al rev limiter issue

The Tach Output would only be used to signal the rev limiter if the rev limiter was an add on device. You have a defective pill or box.

Quote:
Originally Posted by MSD
The MSD Ignition features a Tach Output Terminal on the side of the
unit. This terminal provides a trigger signal for tachometers, a shift
light or other add-on rpm activated devices. The Tach Output Terminal
produces a 12 volt square wave signal with a 20% duty cycle.
Some vehicles with factory tachometers may require a Tach Adapter
to operate with the MSD. For more information on Tachometers and
MSD Tach Adapters, see the Tachometer Section on page 7.


Wiring diagrams for the TFI are on page 18 -19 of the Installation Instructions.
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Old 05-03-2012, 11:16 AM   #10
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Sorry I was wrong, went out and looked at my wiring. He's right, prolly a bad pill
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Old 05-03-2012, 01:35 PM   #11
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I just wondering since the pill is new is there a way to test that? How common is a faulty pill? I don't think I have heard of that ? What size pill are you using?
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Old 05-03-2012, 02:31 PM   #12
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I've heard of it, my cousin got two bad pills with his new box. That was one of the reasons I sold mine and got a 6AL-2

---------- Post added at 07:31 PM ---------- Previous post was at 07:30 PM ----------

I ran a 6200 pill when I had it and never had an over rev problem
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Old 05-03-2012, 04:02 PM   #13
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Does it hit a rev limiter like a new car? I just seem to rev past . And know its not healthy
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Old 05-03-2012, 07:10 PM   #14
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Yeah, it kinda bounces the rpm's
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Old 05-03-2012, 07:35 PM   #15
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Ok so now I know I need to drop the pill size to see if it is inaccurate . I heard that's why they give you the 3000 pill when you purchase
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Old 05-03-2012, 08:10 PM   #16
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So how'd it go?
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Old 05-03-2012, 09:14 PM   #17
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I have to now buy a 3000 rpm pill and see I will let you know
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Old 05-03-2012, 09:51 PM   #18
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Good luck man, this was one of the reasons I upgraded to the 6AL-2, the pill probs and Summit was having a sale. If you bought it new I would try to get my money back and order a 6AL-2 from Summit,
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