Msd6al rev limiter issue

[bigcolt45]

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 ?

[McNassty]

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

[bigcolt45]

No it is properly installed . And completely works except for the rev limiter

[bigcolt45]

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

[Trojan Horse]

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?

[bigcolt45]

What rpm pill is anyone running ? My rpms never seem to stop

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And what is the tach output used for or do I need to connect it?

[McNassty]

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

[bigcolt45]

What do I connect it to?

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The gray wire at the distributor?

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And how?

[Trojan Horse]

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.

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.

[McNassty]

Sorry I was wrong, went out and looked at my wiring. He's right, prolly a bad pill

[bigcolt45]

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?

[McNassty]

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

[bigcolt45]

Does it hit a rev limiter like a new car? I just seem to rev past . And know its not healthy

[McNassty]

Yeah, it kinda bounces the rpm's

[bigcolt45]

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

[McNassty]

So how'd it go?

[bigcolt45]

I have to now buy a 3000 rpm pill and see I will let you know

[McNassty]

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,