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post #11 of (permalink) Old 01-17-2004, 03:17 PM
brendan
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Re: Anyone install an MSD on their Howell TBI??

Tom, would you elaborate on how you tried to run the HEI module parallel to the duarspark module?
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post #12 of (permalink) Old 01-17-2004, 03:40 PM Thread Starter
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Re: Anyone install an MSD on their Howell TBI??

UPDATE!!! It works.

I tried a couple of things with the GM ignition module and the duraspark module. If I wire the GM Mod. in series with the duraspark mod. I can get a good signal from my coil(-) to the GM ECM. This keeps the Duraspark ignition in tact, and uses the GM Module's clean signal to fire the ECM. Here is a diagram from Bill-usn1 on the www.thirdgen.org TBI Forum that I modified for my situation.

EDIT: Updated image may not reflect the current topic.


This setup should work as a good signal for the ECM in many situations.

Later,
Tom

PS I have not had time to completely test this setup, and I do not know if it causes any ill effects for either of the ignition modules.
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post #13 of (permalink) Old 01-17-2004, 04:06 PM
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Re: Anyone install an MSD on their Howell TBI??

I'm interested to know how it turns out.

Why not just use the 8 pin module?

Here's my cleaned up version of the drawing.(I drew the one you modified from an old TR drawing.)
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File Type: jpg 1248427-Duraspark with TFI and 8 PIN HEI module revised.jpg (19.9 KB, 33 views)
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post #14 of (permalink) Old 01-17-2004, 05:06 PM Thread Starter
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Re: Anyone install an MSD on their Howell TBI??

I am not using the GM 8-pin module because I am not using the GM ECM to control ignition. I only using the GM ECM for fuel delivery. If you have a decent spark table for the AMC 4.2L let me know. I may convert to computer contolled ignition later.

Thanks,
Tom
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post #15 of (permalink) Old 01-17-2004, 06:16 PM
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Re: Anyone install an MSD on their Howell TBI??

Oh, right. I was just telling someone yesterday that the Howell has no spark control. I have chip for the 1227747 with a spark table for the 258 that I bought from AFI. Once I get a chip burner, I'll scan you the spark table.

Probably by the time you're getting you're system 100% functional, I'll be getting into fine tuning the chip I got for the 258.
post #16 of (permalink) Old 01-17-2004, 06:19 PM Thread Starter
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Re: Anyone install an MSD on their Howell TBI??

That would be great. Is AFI Affordable Fuel Injection? What is there system like? Does it run well on your 258? I think I could make my own spark table if I had the spark and advance curves for the AMC 258 from the factory service manuals.

Thanks,
Tom
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post #17 of (permalink) Old 01-17-2004, 07:20 PM
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Re: Anyone install an MSD on their Howell TBI??

AFI=yep.

I don't have it going yet, they are cleaning my injectors, and I have to fab the adapter. It'll be up and going in the next week or so.

Im sure you could do it(spark table) yourself, but it would, of course, be easier to have most of it done for you. That's my reasoning for laying out the $100 for the chip. It's going on my daily driver. I don't have time to tweak curves for a month.

Their 258 system is all GM, like the howell. They use a 4bbl offenhauser intake and use a generic 4bbl to tbi adapter. I am not sure that they actually offer spark control in their kit, but I asked Norm to include it on the chip.

post #18 of (permalink) Old 01-17-2004, 07:44 PM Thread Starter
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Re: Anyone install an MSD on their Howell TBI??

Thanks for the info. I am sure that their spark curve would be a great starting point to say the least.

Thanks,
Tom
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post #19 of (permalink) Old 01-18-2004, 12:34 AM
 
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Re: Anyone install an MSD on their Howell TBI??

yes much better.
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post #20 of (permalink) Old 01-18-2004, 09:08 AM Thread Starter
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Re: Anyone install an MSD on their Howell TBI??

It works as I have it drawn, but I don't have much time on it. What about the diagram looks wrong? I tried it using org and ppl from the Dspark module, and also with the wires swapped around P to N. I am open to suggestions. I was going to do the permanent wiring later today, and I would prefer to only do it once.

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