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  1. 2020 Chevrolet Corvette to get an 'un-tunable' ECU?

    https://www.autoblog.com/2019/06/01/2020-chevy-corvette-c8-tuner-proof-ecu/



    Interesting. Where there's a will...
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    I installed the marine MPFI intake manifold and...

    I installed the marine MPFI intake manifold and MotoTron 60# fuel injectors.

    Does the 0411 PCM upgrade allow for a 2 bar MAP sensor? I could use that. (And perhaps 3 bar next...)
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    No, it's not a vacuum leak, it's the tune. ...

    No, it's not a vacuum leak, it's the tune. Sounds like an emissions thing. I think it's most annoying with manual transmissions.
    ...
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    I will work on pulling it down. It's the factory...

    I will work on pulling it down. It's the factory tune, though.

    Thanks,
    Scott
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    Sorry, 2014 RAM 1500 with 5.7L HEMI and 8-Speed....

    Sorry, 2014 RAM 1500 with 5.7L HEMI and 8-Speed.

    I'm not talking about shifts. The ZF shifts great. I'm talking about when your rev the engine and it /slowly/ decreases the RPMs.

    Thanks,...
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    Can I remove the Rev Hang from 5.7L HEMI RAM?

    Can I remove the Rev Hang from my 5.7L HEMI RAM?
    Is "Rev Hang" the right terminology I should be using?

    Thanks,
    Scott
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    That's pretty much what I'm trying to find out,...

    That's pretty much what I'm trying to find out, how I verify if it is slipping.

    Normal cruising, you don't notice anything. Under WOT, top end upshifts feel weak and off the line doesn't seem to...
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    I don't see TCC Slip anywhere in my collected...

    I don't see TCC Slip anywhere in my collected logs. Options seem slim with a Chevy 4.3



    I have a wideband, although not connected to data logging. I'm tuned on the rich side, I know that.
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    How do I know if my trans is slipping?

    I have a turbocharged S10 with 4.3/4L60E. Off the line doesn't feel as strong as it used to in the past, and the high end shifts are weak.

    The power delivery is not very linear, so how can I tell...
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    Thanks for the confirmation. :cheers:

    Thanks for the confirmation. :cheers:
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    Tune file size after upgrade

    My last tune was done using 2.24 and the file size was 474 KB.
    I upgraded to 3.6 and grabbed the tune off my truck -- 175 KB.

    Is this file size change to be expected?
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    Apply VIN from V6 PCM on V8 PCM?

    I found this message from Bill posted a few years ago:



    I have a '99 S10 4.3 and was considering an LSx swap. The wiring harness I can have made would use the LSx V8 PCM. However, for...
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    S10 4.3 bogs off idle

    1999 S10 4.3/4L60E with marine MPFI intake manifold and SyTy exhaust manifolds/turbo. Needless to say, the air intake tract is completely different from the stock configuration. The truck has a bog...
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    My truck doesn't have any AE and DE tables. ...

    My truck doesn't have any AE and DE tables. Seriously. :(
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    Ok, I finally got around to grabbing some quick...

    Ok, I finally got around to grabbing some quick logs.
    My latest tune and a few logs from today attached.

    I certainly don't know what I'm doing, but looking at
    it my GUESS is something to do with...
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    I probably can't get it done until next week, but...

    I probably can't get it done until next week, but I will do that. Thanks!
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    Slight off idle bog

    Background:

    1999 4.3 S10
    Marine MPFI intake
    MotoTron 60# injectors
    SyTy manifolds/turbo, etc

    Symptoms:

    Under medium (and probably heavy) throttle load immediately off idle,
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    Adjusting OD shifting

    Any good theories or rules for adjusting the OD shift parameters?

    My truck now has a turbo, and apparently it's highway manners are
    changed enough that it's kind of odd when it comes to "passing"...
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    The Catalyst test did eventually complete itself,...

    The Catalyst test did eventually complete itself, but I did not have to wait around to see how long it would take. I discovered that my truck was old enough that, based on our local emissions rules,...
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    Damn, I didn't even think about Cruise Control. ...

    Damn, I didn't even think about Cruise Control. :doh:

    Thanks for the info. That should help with my tuning.

    PS- Broken Bow, OK? I've been to Broken Bow, NE. :D
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    Attached is the latest tune that I'm running....

    Attached is the latest tune that I'm running.
    Other than TM removed the rest are factory.
    (Specific to the transmission tables, that is.)
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    Confused downshifts from 3rd to 1st/2nd

    Re: 1999 S10 4.3 (turbo) w/ 4L60E auto

    I haven't done serious on-road tests to confirm, but I'm pretty
    confident I know what my tranny is doing that is bothering me.

    When cruising at lower...
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    Normal, Economy, Cruise and Hot

    What defines these Normal, Economy, Cruise and Hot modes?
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    Oh, sweet, I did not even know about this tune...

    Oh, sweet, I did not even know about this tune repository.
    I checked it out and found exactly what I needed. Thanks!
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    I6 torque converter locking

    For anyone who has been tuning a 4.2 I6 TrailBlazer,
    can i get a screenshot of the stock TC locking table?
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