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  1. #1
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    more questions...

    Ok, so I've been busy at work the last few weeks and haven't had a chance to mess with my truck too much. I took it out to the local mud bog and ran it in a hill and hole and flat track. after my runs were over it left me scratching my head with the following questions while looking through my logs.
    1. does a 4l60e normally jump 2nd gear?
    2. if the baro is showing 103.3 and map starts dropping as rpm increases, does this indicate too small of a tb?
    3. if my TCC is set to lock in 3rd at 70mph in kickdown why is it showing applied in my logs at 30 in 4low?

    I attached one of my logs with the areas of concern highlighted.
    Attached Files Attached Files
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
    93 S10, 36x12.5x15 TSL's, custom turbo headers, 266HR cam, p&p vortec heads, $0D Marine MPFI with 8psi boost.
    05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,

  2. #2
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    couple of thoughts:

    the PCM can command a 1-3 skipshift if the conditions are correct for it (letting off the throttle at the top of 1st can do it). oddly enough, in the log it goes from commanding 1st, 3rd, 2nd, 3rd within 4 samples....

    MAP dropping at higher RPM with the throttle still being held full open is indicative of some type of air restriction. could be the TB, but could also be the air filter, tubing, etc, etc.... have to start changing out the most restrictive parts before jumping to what might not be the problem.

    and if the 94-95 truck stuff is anything like the 60V6 MPFI stuff, then the TCC is probably locking based off of high RPM. may want to look around for a parameter that controls that function, if necessary.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


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    Quote Originally Posted by RobertISaar View Post
    couple of thoughts:

    the PCM can command a 1-3 skipshift if the conditions are correct for it (letting off the throttle at the top of 1st can do it). oddly enough, in the log it goes from commanding 1st, 3rd, 2nd, 3rd within 4 samples....

    MAP dropping at higher RPM with the throttle still being held full open is indicative of some type of air restriction. could be the TB, but could also be the air filter, tubing, etc, etc.... have to start changing out the most restrictive parts before jumping to what might not be the problem.

    and if the 94-95 truck stuff is anything like the 60V6 MPFI stuff, then the TCC is probably locking based off of high RPM. may want to look around for a parameter that controls that function, if necessary.
    Is there any settings to delay skipshift or any setting for it at all? I can't see any thing in my xdf. that 1st, 3rd, 2nd, 3rd thing had me scratching my head too. It doesn't do it on the other track I run on. I've attached a log of the hill and hole I run where it didn't skipshift but still locked the TC in 3rd and dragged my RPM's down.
    on the dyno we pulled the hat of the TB for a run. there was no change in MAP.
    Attached Files Attached Files
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
    93 S10, 36x12.5x15 TSL's, custom turbo headers, 266HR cam, p&p vortec heads, $0D Marine MPFI with 8psi boost.
    05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,

  4. #4
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    I found this setting it is set for 0 sec. I wonder if I was to set it to like 10 seconds if that would keep the TCC from locking.

    Title: Time for TCC Off after Acceleration
    Location: 6743
    Usage: 4L60-E TCC Parameters
    Tips: Time for TCC to remain unlocked after rapid acceleration.
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
    93 S10, 36x12.5x15 TSL's, custom turbo headers, 266HR cam, p&p vortec heads, $0D Marine MPFI with 8psi boost.
    05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,

  5. #5
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    that's not what you're looking for... that's how long the TCC will stay unlocked (if it was locked) after a period of high positive D-TPS.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


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    In the LT1 engine $EE there are some paremters for skipshift, not sure about yours?

    Since it seems to be working correctly in 4 high and issue is in 4 low I would look at VSS settings for 4 low... seems it's getting wrong speed.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  7. #7
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    makes sense. I was thinking this might work.
    Title: Engine Temperature for TCC Off
    Location: 6729
    Usage: 4L60-E TCC Parameters
    Tips: Cold engine temperature thresholds to prevent/disable TCC lockup.


    right now its set for 20*C. maybe set it to 99*C?
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
    93 S10, 36x12.5x15 TSL's, custom turbo headers, 266HR cam, p&p vortec heads, $0D Marine MPFI with 8psi boost.
    05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,

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    Yeah you could disable it, but should be a way to make it work right too!

    Seems if this was set correctly it would work? "4wd Low Reduction Ratio" I know when I used a scantool on my LT1 4l60E I found the speed way off and not locking up TCC till like 80 MPH...

    You may need to use the trans ADX and do a datalog to see what's going on!

    "==== 4L60-E Jump Shift Compensation Parameters =========="

    Maybe keeping trans in third or shifting manually will help the skipshift? Scaler "Disable Manual Shift Pattern" is set on stock.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  9. #9
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    Quote Originally Posted by EagleMark View Post
    In the LT1 engine $EE there are some paremters for skipshift, not sure about yours?

    Since it seems to be working correctly in 4 high and issue is in 4 low I would look at VSS settings for 4 low... seems it's getting wrong speed.
    I was thinking that too. I looked at the math calculations for 4low and thought I opened a japanees dictionary. I'll check accuracy with the gps when I get the TBI back from the machine shop.
    Last edited by PJG1173; 05-16-2012 at 03:19 PM.
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
    93 S10, 36x12.5x15 TSL's, custom turbo headers, 266HR cam, p&p vortec heads, $0D Marine MPFI with 8psi boost.
    05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,

  10. #10
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    Quote Originally Posted by EagleMark View Post
    "==== 4L60-E Jump Shift Compensation Parameters =========="
    OMG if that was a snake it would have bit me... looking at it now. I have been keeping it in 3rd. on the hill and hole I had to pull it down to 2nd to keep my RPM's up so the motor wouldn't bog.
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
    93 S10, 36x12.5x15 TSL's, custom turbo headers, 266HR cam, p&p vortec heads, $0D Marine MPFI with 8psi boost.
    05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,

  11. #11
    RIP EagleMark's Avatar
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    You may need to use the trans ADX and do a datalog to see what's going on!
    If you've never done this it is just as amazing data as engine!

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  12. #12
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    I did some google searching on Jump Shift and turned up zilch. Anyone know how this works?
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
    93 S10, 36x12.5x15 TSL's, custom turbo headers, 266HR cam, p&p vortec heads, $0D Marine MPFI with 8psi boost.
    05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,

  13. #13
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    When accelerating hard and you let off a little it skips a gear to where it should be...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  14. #14
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    Quote Originally Posted by EagleMark View Post
    When accelerating hard and you let off a little it skips a gear to where it should be...
    thats the problem I never let off.
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
    93 S10, 36x12.5x15 TSL's, custom turbo headers, 266HR cam, p&p vortec heads, $0D Marine MPFI with 8psi boost.
    05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,

  15. #15
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    Quote Originally Posted by PJG1173 View Post
    thats the problem I never let off.
    I like your style!

    May be different in your mask? Only time I have dealt with this is in the LT1 $EE...

    I have found a couple times transmissions do weird things after some tables have been messed with. If you done a lot of changes maybe going back to stock trans bin file and decrease shift times if you don't have a shift kit and "Disable Manual Shift Pattern" so you can shift manually. Then do a trans Data log and you will see exactly what it is doing and why...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

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