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  1. Thread: Idle surge

    by pknowles
    Replies
    11
    Views
    2,710

    The tune you sent is MAF only, I didn't change...

    The tune you sent is MAF only, I didn't change that. Under Airflow/Dynamic, High RPM disable is set to 100 rpm, which means anything over 100rpm uses only the MAF, no VE table.

    If you do a...
  2. Thread: Idle surge

    by pknowles
    Replies
    11
    Views
    2,710

    So this is a MAF only tune, is this due to the...

    So this is a MAF only tune, is this due to the cam? I see your STFT's swing wide on decel suggesting the MAF tune could use some work. Also, under spark/Advance your overspeed and underspeed timing...
  3. Thread: Idle surge

    by pknowles
    Replies
    11
    Views
    2,710

    looks like it's hitting a stall limit and then...

    looks like it's hitting a stall limit and then cranking open the electronic throttle or IAC to save it from stalling. Timing jumps around a lot as well. Can you post your tune and the stock version...
  4. Replies
    173
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    259,414

    Wow, this thread is a blast from the past. I...

    Wow, this thread is a blast from the past. I sold my 97 vortec almost 10 years ago now. Sorry guys, I don't see HPT going back and supporting these 25 year old PCM's.
  5. Replies
    6
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    1,535

    If it where off by exactly an hour I would say...

    If it where off by exactly an hour I would say time zone? Here is what I see at 57m and 28sec into the file.
    106802

    Created time is off exactly an hour, but there is no 09:45:45.652 like you...
  6. Replies
    20
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    13,838

    Would love Honda support. I have a civic, a...

    Would love Honda support. I have a civic, a brand new 2L turbo Accord, and the two Chevy's in my sig. Would love to tune the Honda's.
  7. Replies
    6
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    1,535

    The scan starts at 09:05:05.422. Post wrong one?

    The scan starts at 09:05:05.422. Post wrong one?
  8. Thread: Sparke

    by pknowles
    Replies
    4
    Views
    1,576

    post your tune.

    post your tune.
  9. Replies
    8
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    8,930

    Are you on 93 octane? 13 degrees at 4psi seems...

    Are you on 93 octane? 13 degrees at 4psi seems very low.
  10. Replies
    7
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    2,446

    High octane table from 2200rpm and .72g to...

    High octane table from 2200rpm and .72g to 3200rpm and .80g looks a few degrees low, but depends on what fuel you run. Are you getting knock where you want more power? I would bring burst knock...
  11. Replies
    13
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    4,015

    I scaled due to the 4063 lb/h limit on the MAF...

    I scaled due to the 4063 lb/h limit on the MAF table. Unscaled I would hit the 4063 limit around 10psi of boost pressure. I'm using an LS3/LS7 MAF in a 4" tube. The injectors are 1000cc/min from...
  12. Replies
    8
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    8,930

    I'm up at 9psi on my stock bottom end 2001 LQ4...

    I'm up at 9psi on my stock bottom end 2001 LQ4 with a 78mm turbo and on my way to 12psi. I tune on E85 to be safe and see knock in boost. Still dialing this thing in, but 4-6 psi is not much. If...
  13. Replies
    13
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    4,015

    It's a scaled tune, scaled by 66.7%, so ~.75L...

    It's a scaled tune, scaled by 66.7%, so ~.75L goes to ~.50L in scaled tune. Yes boost referenced. Didn't catch the offset vac table, thanks!

    Updated the offset vac table today and went for a...
  14. Replies
    13
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    4,015

    Speed density does solve a lot of these problems....

    Speed density does solve a lot of these problems. I flashed a speed density tune back in my truck today. Throttle response and smoothness have taken a negative hit. I'll drive a around for a few...
  15. Replies
    13
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    4,015

    Not DCFO. I turned off DFCO and relogged. See...

    Not DCFO. I turned off DFCO and relogged. See tipin and tipout files. You can see it goes a little rich than a little lean on tip in before going into PE. Tip out shows a huge lean spike. Not...
  16. Replies
    13
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    4,015

    Yes, but as I'm backing off it goes lean (peak at...

    Yes, but as I'm backing off it goes lean (peak at 24.2 seconds), then comes back close to stoic, then goes into DFCO. I'll disable DFCO tomorrow and try again.
  17. Replies
    13
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    4,015

    Tune and log attached. VE is perfect (at least...

    Tune and log attached. VE is perfect (at least the regions I hit up to about 9psi) and MAF has been tuned. It runs great, just trying to get rid of these lean spikes. Note, I'm doing this tuning on...
  18. Replies
    13
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    4,015

    In transient fueling?

    I'm working on transient fueling to remove lean spikes on throttle entry and throttle exit on my 2001 Silverado 6L with 76mm turbo running on a 2002 Tahoe flux fuel tune. I'm running a MAF tune...
  19. Replies
    3
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    2,032

    VE correction factor

    Is VE correction factor the same as the VE predictive airflow that gets used in a blend SD and MAF tune? I'm running a two bar custom OS on a 2002 Tahoe flex fuel file. I've noticed that when I run...
  20. Replies
    3
    Views
    1,124

    Well I looked through my later unscaled stock MAF...

    Well I looked through my later unscaled stock MAF logs, unscaled LS7 (card style) MAF logs, and then scaled LS7 (card style) MAF logs. I actually see this behavior in all of them. It always starts...
  21. Replies
    3
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    1,124

    On my scaled MAF tune, I plotted Dynamic Airflow...

    On my scaled MAF tune, I plotted Dynamic Airflow vs my MAF curve, see below. Notice Dynamic Airflow (magenta) follows the MAF curve (black) until 6700 Hz then deviates then follows again at 8600 Hz....
  22. Post the two tunes.

    Post the two tunes.
  23. Replies
    3
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    1,124

    Non Scaled tune attached.102438

    Non Scaled tune attached.102438
  24. Replies
    3
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    1,124

    Stumped on scaled tune

    I have a 2001 Silverado 6L with a 78mm turbo system running a 2002 Tahoe flex fuel file with 2 bar applied. I've run this thing in OL, SD, and MAF tunes for the past few months with no issues at...
  25. Replies
    4
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    1,229

    Did you zero any torque tables? I zeroed either...

    Did you zero any torque tables? I zeroed either Spark retard vs torque reduction or Torque loss %vs spark retard (can't remember which) and idle rpm's would hang.
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