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  1. Replies
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    2,987

    Your driver demand limit source changes to...

    Your driver demand limit source changes to "insufficient fuel flow" right when that happens. I've seen that before when I was running a tune from a known tuner. I never looked into how to fix it...
  2. If you still have the Whipple flare tool, go into...

    If you still have the Whipple flare tool, go into flare and make sure the knock limiting feature is disabled. I think there is a way to do it in the VCM scanner somewhere too. I've seen it do some...
  3. Unexpected issue after changing the baro to 12.2...

    Unexpected issue after changing the baro to 12.2 psi... car will not start when IAT is hot. I had to flash a tune while stuck at a gas station pump, lol.

    I swapped back to the original tune that...
  4. According to Whipple, only the GT350 is sensitive...

    According to Whipple, only the GT350 is sensitive enough to need a baro sensor. So they include an actual sensor in the GT350 kit and that slope/offset must represent the transfer function of that...
  5. I'm not sure how Whipple hooks up the baro sensor...

    I'm not sure how Whipple hooks up the baro sensor on GT350 kits, but I'll bet it's similar to the IAT2 sensor where they use the IMRC harness. A really simple circuit is a 5V supply, a ground, and a...
  6. Yes, great idea. I went through the slope/offset...

    Yes, great idea. I went through the slope/offset math with the voltage I log in the scanner and targeting pressure for altitude at 5000ft. I came up with a slope of 4.993... good guess, did you...
  7. I had default baro at 27 and I left the cylair...

    I had default baro at 27 and I left the cylair multipliers at the Whipple settings. The car ran terribly. Actual barometric pressure where I live should be around 12 psi, so I would think closer to...
  8. Distance tables determine which mapped point you...

    Distance tables determine which mapped point you are in and the blending... as you said. And the rows used in the distance tables are load... so load/rpm determines which mapped point you are in.
  9. Disabling the baro sensor did not go so well. ...

    Disabling the baro sensor did not go so well. Car was hard to start and while driving, I was getting a ton of IPC errors. I also think something was closing the throttle when I tried some heavier...
  10. Here's the Whipple settings: 120609 This is...

    Here's the Whipple settings:

    120609

    This is what my OEM Ford tune had:

    120610

    I should also mention that I live at about 6000ft above sea level.
  11. Thanks murfie. I tried changing the feedback...

    Thanks murfie. I tried changing the feedback correction, but I haven't been able to get a log under the same conditions. I actually got some snow here over the weekend, and just took a short drive...
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    You're logging too many parameters or your...

    You're logging too many parameters or your polling interval is too low. The chart is misleading because it interpolates between samples. If you look at injector pulse width, you only got 4 samples...
  13. 2016 Mustang GT with Whipple - Need some help tuning return to idle

    My car is a 2016 GT with a modified Whipple tune, E85, id1050x, and a T56 swap. I've got most everything running well except for a hanging idle and very slow return to idle, especially when hot.
    ...
  14. Ok, that changes some things, thanks. Does that...

    Ok, that changes some things, thanks. Does that mean I should include the offset when calculating fuel mass from the injector slope?

    (pulse width + offset) * slope = fuel mass?

    Edit: Thinking...
  15. I'm doing some calculations trying to determine...

    I'm doing some calculations trying to determine how to adjust the low slope. I could guess and check, but I like spreadsheets :)

    Can someone explain the offset vs voltage? I'm assuming the...
  16. Wow, thanks Grim5.0. Setting up that table...

    Wow, thanks Grim5.0. Setting up that table against my first log after changing injectors is pretty revealing:

    117382

    I had just assumed that the best path was trying to get everything...
  17. Well I tried changing the mapped point 0 torque...

    Well I tried changing the mapped point 0 torque table top row and used the torque inverse calculator to populate the inverse. Generally I increased the torque values in that row hoping that would...
  18. I'm not sure I'm on the right track yet. :) I...

    I'm not sure I'm on the right track yet. :) I just went down a rabbit hole of researching the torque and inverse tables and now I'm completely lost. You mentioned idle airflow tables, but I'm not...
  19. Change MAF curve affecting idle rpm - 2016 Mustang w/ Whipple

    I just swapped to a return fuel system with ID1050's and I'm trying to keep using the Whipple OS. As others have seen, entering the correct numbers from ID for the injectors causes large fuel trim...
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    You should set it to 55 psi at idle, but...

    You should set it to 55 psi at idle, but disconnect the vacuum line from the regulator. Plug the line so there is no vacuum leak, but the regulator port should be open to the air. This way it will...
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    I have the same fuel pressure and numbers as you...

    I have the same fuel pressure and numbers as you in my 16 tune and the car runs fine. I do have fuel trims pulling 15-20% fuel at idle, but I drove the car around and it didn't run like crap or...
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    I'm no expert, but one thing I noticed is that...

    I'm no expert, but one thing I noticed is that you still have the fuel pump secondary monitor enabled in the fuel sys section. I'm not sure what it does, but on 15-17's, everyone says to disable it....
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    I ran across a similar problem a few years ago,...

    I ran across a similar problem a few years ago, but at the time I chalked it up to something being handled differently in the Whipple tune. I made a thread about it here: ...
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    Interesting find. I had trouble in the past...

    Interesting find. I had trouble in the past getting the values in the knock retard - max advance table to stick. No matter what I try, it will never advance more than 4 degrees, and I made a thread...
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    These sensors use a simple circuit called a...

    These sensors use a simple circuit called a voltage divider. It uses two resistors and an applied voltage. There is an internal resistor in the PCM or harness that "divides" the voltage by a ratio...
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