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    True, but the same user could copy their changes...

    True, but the same user could copy their changes into the diy-ltcc firmware and re-flash it at the same time. This isn't a table a lot of folks tweak on extensively (it's 17 cells).



    I'll have...
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    Good info, thanks for looking. The tables might...

    Good info, thanks for looking. The tables might save me a lot of time capturing data points.

    I added a 'ect raw' field in my eehack definition that just removed the conversion to C, assuming this...
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    It's back to the drawing board on reading coolant...

    It's back to the drawing board on reading coolant temp. I didn't get a good look at lower temp ADC readings last night due to some initial problems logging from the ignition controller.

    Logging...
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    You have my (completely divided) attention. I'm...

    You have my (completely divided) attention. I'm going to be working on a major diy-ltcc rewrite over the next several days, so I may not have a running car to test on. But I am highly interested. Tau...
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    Completely anecdotal information, but looking...

    Completely anecdotal information, but looking more closely at the "raw" value in the ALDL stream it seems like this might be some hybrid conversion to kelvin. Looks almost as if it's the coolant temp...
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    Don't worry about it - it's not going to pose a...

    Don't worry about it - it's not going to pose a problem. I'll simply build a lookup table that goes something like:


    [adc_raw_value],[coolant_temp],[coil_temp]
    730,50c,<user configurable>...
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    I tend to agree, but have considered possibly...

    I tend to agree, but have considered possibly using map to skew the dwell target from "safe" to "pedal to the metal" - i.e. high MAP values would get closer to 85% and low values closer to 93% (just...
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    Here's the data I have thus far. Note that I only...

    Here's the data I have thus far. Note that I only measured spark duration for a few cells. This isn't nearly as complete a of picture of the data that I set out to gather initially, but it's what I...
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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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