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    Tuning '90 vette for boost with CCM comms

    I have a 1990 Corvette, which has the 1227727 running $8D. I'm looking at tuning it for boost, but I can't find an option that preserves the ECM-CCM communications required in '90-'91 vettes for some...
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    As promised, here's a TunerPro log. It was taken...

    As promised, here's a TunerPro log. It was taken with ALDLDroid, but it should be identical to one taken with TP.
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    Hey Elky, Sorry for the delay - haven't...

    Hey Elky,

    Sorry for the delay - haven't forgotten about this, my datalogging is just on the fritz. Once I get datalogging and a few other issues sorted out I can get a TP log of startup. In case...
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    Yeah, referring to the section "OL NOT in PE AFR"...

    Yeah, referring to the section "OL NOT in PE AFR" starting at the bottom of page 30. If I understand the logic correctly, the startup enrichment and the open loop enrichment terms (like 0x41F, OL %...
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    That's very helpful, thanks! I've read and...

    That's very helpful, thanks! I've read and re-read your post several times over the past couple of weeks as I've been working through this. I've also revisited various parts of that doc a few times....
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    Over on Thirdgen...

    Over on Thirdgen, RBob explained that it's circular - the calculated airflow from one loop is used in the inverse MAT lookup table in the next loop.
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    My current best guess is that the inverse MAT g/s...

    My current best guess is that the inverse MAT g/s column is calculated using VE, RPM, ideal gas law, and the raw MAT value (not the weighted MAT-CTS value).

    If this is the case, my workaround for...
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    Okay, looks like there are two relevant tables:...

    Okay, looks like there are two relevant tables: MAT Inverse Term Lookup Delta Mult. vs. Airflow and MAT Compensation Counts vs. MAT.

    I'm trying to wade through all the math on how each plays a...
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    I stumbled back across the Thirdgen Prom Tuning...

    I stumbled back across the Thirdgen Prom Tuning Guide Book - what a resource! I need to not forget about it again.

    And what do you know, in chapter 5, under the 7730 ECM, there's a topic titled...
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    I've gone back and taken a slightly more rigorous...

    I've gone back and taken a slightly more rigorous look at the data. In addition to my comparison at 5250 RPM, I've compared at ~3600 where PE AFR is slightly different. Rather than relying on the...
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    Inconsistent Injector PW at WOT?

    $8D, 1227727 (basically 1227730) ECM.

    I'm tuning WOT VE using my wideband, and I noticed that my AFRs are pretty inconsistent. For example, in one evening I had three WOT pulls, and in three...
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    Thanks. I'm still based on the stock bin (ARFP...

    Thanks. I'm still based on the stock bin (ARFP but with the 3.33 rear end), and I was just trying to get a better feel for what's in that. I suppose there's not gonna be much support around here for...
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    Alright, found the hack for $8D, and it lists the...

    Alright, found the hack for $8D, and it lists the missing parameters. L8301 (0x301 in TunerPro) is reset speed, L8302 (0x302) is enable speed, L8303 (0x303... you get the pattern) is disable speed,...
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    FINALLY found it. "$8D" here is the only of ~8...

    FINALLY found it. "$8D" here is the only of ~8 XDFs I reviewed that had it ("C.A.G.S. Enable Coolant Temp" at 0x300).

    I recall seeing a lot more parameters, and I see in the XDF that the next...
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    Where's CAGS in $8D???

    I drive a 1990 Corvette running $8D on a 1227727 ECM. I did most of the tuning for a new engine ~3-4 years ago, and I'm revisiting the subject to dial things in finally. The Corvette has CAGS...
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    That's what I'm wondering. When I'm driving with...

    That's what I'm wondering. When I'm driving with the windows down, if I pass something that reflects my car's sound back to me it sounds like I can hear an exhaust tick coming from the left side.
    ...
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    I was able to take a few more logs, and on the...

    I was able to take a few more logs, and on the first two I'm certain I captured the problem. I haven't been able to log with someone in the passenger seat watching my phone, but I'm almost certain it...
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    Here's a new datalog. For some reason I didn't...

    Here's a new datalog. For some reason I didn't see it running super rough like usual, although right after startup it was wanting to buck a bit when cruising in first/second gear.

    The only change...
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    Lately it's been happening pretty bad, and I've...

    Lately it's been happening pretty bad, and I've been paying close attention to what it feels like.

    It seems that when I add throttle, I get a momentary surge of acceleration, but then it...
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    I've noticed the coolant temperature needle is...

    I've noticed the coolant temperature needle is always in the exact same spot when it starts running rough. Does this just point to a bad spot in my closed loop AFR table?

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    What would be...
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    I tried leaning out startup, and that didn't...

    I tried leaning out startup, and that didn't help. It wasn't any better when it was cold, and it was a lot worse hot. Is it possible this is moisture related? I realized I kept it in the garage in...
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    I've driven it the past couple days with the tune...

    I've driven it the past couple days with the tune with more AE, and it's definitely worse. I just made a new tune with less AE, and hopefully that will take me in the right direction. If that helps,...
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    I increased the AE table like so: 13329 and...

    I increased the AE table like so:
    13329
    and hooooly crap that was bad. Whenever I touched the gas, the engine just about died. After about 30s to a minute though, it ran great. Check out the...
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    I've smoothed my VE tables pretty extensively,...

    I've smoothed my VE tables pretty extensively, although there are a few little areas that are a little jagged. Here's the graph of my lower VE table:
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    Whoops, found the right table. Here it...
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    Thanks for looking at my logs. I tried checking...

    Thanks for looking at my logs. I tried checking the fuel pressure before I drove out to VA, but the gauge I got from O'Reilly was leaking like crazy. I don't have time (or tools) to pull a spark plug...
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