What I've been working on... Turbo GP SOLD! - Page 22 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-31-2011, 08:27 PM   #211
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Haha, don't be amazed until I get it to work!

You know the 3500 has provisions for a distributor.
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Old 02-09-2011, 11:05 PM   #212
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Got to work on the MS today. I loaded the new firmware (MS2Extra) and loaded the new tuning software on the computer (TunerStudio). I spent a good bit of time transferring settings from one program to the other. Then I got to work building some of the circuits. I can't finish all of the board modifications until I test the current GMDIS setup with the new firmware and software. Hopefully I can test it this weekend. After that, I can finish the rest of the board modifications and install the coil near plug ignition. ---stoked---

Some pictures of the cam input circuit I built.







The lead thats sitting there not being used runs to JS10 for input to the processor. I'll run it after I test the DIS.
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Old 02-09-2011, 11:08 PM   #213
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Here is the wiring diagram for the factory CNP ignition on the LX9.


Pin A B and C are spark inputs to drive the coils. Pin D is sensor ground back to the Megasquirt, Pin E is block ground and F is 12V with a 15A fuse.
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Old 02-10-2011, 01:01 AM   #214
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15A fuse? How much power is necessary to make it to the spark voltage?
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Old 02-10-2011, 09:11 AM   #215
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It'* a 15A fuse on the factory setup So hopefully I won't pull more than that or I've got a problem.

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Old 02-10-2011, 10:01 AM   #216
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No, I certainly hope not. I thought it was less. Isn't the spark several tens of thousands of volts AC at low amps? Also, if you're thinking of a reason to say the new setup pulls more power, somehow the factory ignition setup from GM may be more efficient at converting voltage than an aftermarket setup. I wouldn't bet on it, but there'* something to chew on.

Also, thanks for the additional chart! This thread is just loaded with info!
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Old 02-10-2011, 10:16 AM   #217
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Yep, I did a lot of research in this CNP thing. I'm trying to cram as much information in this thread as possible. That way if somebody comes across this someday and want'* to do the same mods, they'll know exactly what to do.
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Old 02-10-2011, 10:23 AM   #218
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It'* a pretty good idea! You've got a great start with these few 22 pages so far.
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Old 02-11-2011, 12:51 AM   #219
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Alright, the pullup circuits for the coils are built but not wired in. That finishes the circuits that need to be built. In the proto area I now have added 1 input circuit for the cam sensor, and 3 outputs for direct control of 6 coils in wasted spark.


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Old 02-11-2011, 09:24 PM   #220
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The engine fired on the new code. Now to finish the board modifications and pull the DIS and external crank trigger off.
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