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    Interesting reading material - thanks for...

    Interesting reading material - thanks for sharing!

    For what we're trying to accomplish here a pressure chamber is probably overkill. But the zener pile schematic is greatly appreciated. I'd never...
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    I wanted to drop in with an update since it's...

    I wanted to drop in with an update since it's been a while. I've been making progress with coil testing, but the past week has been far less productive than I had hoped due to jury duty and my ISP...
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    I haven't broken out my slide rule to calculate...

    I haven't broken out my slide rule to calculate potential energy, but I suspect that below 12 volts the "creators" knew the engine was either cranking, or wouldn't be running much longer, and that...
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    Thanks for the adc info on the coolant temp...

    Thanks for the adc info on the coolant temp sensor. As long as there's nothing squirrely going on with the way the voltage divider circuit in the ecu is setup, I don't anticipate there will be a...
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    I'm glad you mentioned that, because that's going...

    I'm glad you mentioned that, because that's going to be my approach. So does this mean the ECT byte in the datastream isn't the raw ADC value but converted / conditioned?

    Do you recall the address...
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    Without knowing the type of outputs the ICs in...

    Without knowing the type of outputs the ICs in the PCM use along with the size of the caps it's hard to know what they were trying to accomplish there. Am I correct to assume that is an ASIC (i.e....
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    Voltage regulator showed up yesterday and I was...

    Voltage regulator showed up yesterday and I was able to do some preliminary testing. Looks like it's going to work great. Hoping to do some room temperature tests later this evening.



    Wow, well...
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    Tested a D580 and a D514a coil today with a 100...

    Tested a D580 and a D514a coil today with a 100 ohm rc network resistor.

    Side tangent (again). The purpose of this resistor isn't technically aimed at limiting igniter current. It's the buffer...
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    Unless it increases spark energy or decreases...

    Unless it increases spark energy or decreases dwell time, there would be little point. It should be easy to test so I will - if dwell limiting happens at the same time then there would be zero...
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    That was basically what I gathered from looking...

    That was basically what I gathered from looking at the calibrations, minus the min / max value.

    For me, the takeaway from looking at the factory dwell tables was:

    1) the factory calibrations...
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    Just wanted to drop in with an update. First,...

    Just wanted to drop in with an update.

    First, the new rev 1.1 circuit boards came in last week. I built one out to use on my coil testing rig.

    After that I started working out the...
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    It absolutely will. Part of the fuel scavenging...

    It absolutely will. Part of the fuel scavenging issue with the LT-1 manifold is created by the separate idle plenum. The purpose of the feed holes is to put high velocity air in the head ports to...
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    Curious what your valvetrain mods are - you...

    Curious what your valvetrain mods are - you mention LS7 lifters and springs. What kind of springs, rockers, guideplates, and pushrod length?

    I'm running a 280 xfi with 165lbs on seat, and had all...
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    The later manifold designs without a separate...

    The later manifold designs without a separate idle passage are almost universally cross-ram setups. These have runner inlets positioned in a way that creates the longest possible airflow path between...
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    Eh? We had a bit of a coincidence where my...

    Eh?

    We had a bit of a coincidence where my opti trigger wheel slipped, and vilefly burned up a logic pulser trying to drive some coils I hadn't personally tested yet and I jumped to the wrong...
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    I had a chance to do some preliminary testing on...

    I had a chance to do some preliminary testing on the D580 and D581 coils over the weekend, and the results were very promising. I wasn't able to perform any measurements other than observing the...
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    That's not really going to very beneficial to...

    That's not really going to very beneficial to economy because you'll still be using energy pumping air through the engine. What GM is doing on the late model stuff works as well as it does because it...
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    Can't extract the archive. Will try some other...

    Can't extract the archive. Will try some other tools tomorrow, but your initial analysis makes me think I'm time ahead not even looking at them. Full disclosure - I have a bowtie tattoo, so you're...
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    I was ignoring everything outside of 7-16 volts....

    I was ignoring everything outside of 7-16 volts. They would make more sense if the same patterns were demonstrated throughout all the tunes. It just seems very haphazard.



    Neither do I, and...
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    Agreed. I had the same thoughts, but asked...

    Agreed.



    I had the same thoughts, but asked myself "self, do you even care". No, I don't think I do.



    I understand physics as well as the next guy and have lots of first-hand carnal...
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    No offense but I think you're overthinking things...

    No offense but I think you're overthinking things a bit. Granted - it would be better to have the ability to limp home, but the car's gonna run like crap. Seems like a lot of extra wiring for...
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    Interesting idea, but I suspect if you lose one...

    Interesting idea, but I suspect if you lose one injector fuse O2s are going to see a massive lean condition and immediately max out BLMs on both sides. I guess that's better than raw fuel being...
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    The wiring is completely up to you - this is...

    The wiring is completely up to you - this is where the DIY side of the project comes heavily into play.

    Shooting mostly from memory, here's what I can give you on the PCB wire solder pads.
    ...
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    Honestly the only reason I want it is in the...

    Honestly the only reason I want it is in the event a fantastic new arduino bootloader is released, or someone wants to eliminate the bootloader and boot right into the firmware. Considering the age...
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    That seems to make sense of the conflicting info...

    That seems to make sense of the conflicting info I was seeing on the big box parts website - some were 0.060 and the ACDelco "OE" parts were gapped at 0.040. So even GM's guys got it wrong out of the...
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