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Thread: Hellcat Fellas! U1424 and P1DD2, what do we know

  1. #1
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    Hellcat Fellas! U1424 and P1DD2, what do we know

    What do we know about larger throttle body flow and torque calculations at or near idle? Working with a monster throttle body on a big blower Hellcat, only issue left with the car is if left idling it throws these two codes. I understand it is flowing more air than it is looking for, but I haven't been successful in harnessing that in yet. Anybody else out there dealt with this yet? When logging idle you can see how far off actual torque vs desired is. Log attached, any thoughts or input appreciated!
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  2. #2
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    Whipple 4.5 and their big oval T/B?

  3. #3
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    Yes sir. Messed with one?

  4. #4
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    Looking like HP doesn't have the table to make this work. Grrr

  5. #5
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    Post up your tune file - I dont have a cat file infront of me - I thought there was a value for this - its assembled from 2 different idle tables.
    Doc
    Doc's Performance & Dyno Tuning - Las Vegas NV . Tuning any and all cars!

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    Quote Originally Posted by DRTurbo View Post
    Post up your tune file - I dont have a cat file infront of me - I thought there was a value for this - its assembled from 2 different idle tables.
    Are you talking about the small and large TB airflow tables?

  7. #7
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    Quote Originally Posted by CravenPerf View Post
    Yes sir. Messed with one?
    Make sure you don't have any vacuum leaks. I had some "issues" with ours. Also you need to log total air flow. That's the T/B airflow.

  8. #8
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    No leaks, I'll let you know if our current solution doesn't fix it, found a fix in another software, now we will see if we can make the HP side work. If it works I'll post it up.

  9. #9
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    Quote Originally Posted by CravenPerf View Post
    No leaks, I'll let you know if our current solution doesn't fix it, found a fix in another software, now we will see if we can make the HP side work. If it works I'll post it up.
    Sounds good. If you know what tables you need see if HPT will add them.

  10. #10
    HPT Employee Mark@HPTuners's Avatar
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    Make sure you using the latest VCM Suite 3.4 or VCM Suite 3.5 beta. We are constantly improving the software, fixing bugs, adding parameters, etc. Especially in VCM Suite 3.5 beta, new stuff gets added almost daily. Your issue may have been solved in a newer version of the software. If you need the beta, just email support. Make sure to include your MPVI Serial Number.

    After you download latest, be sure to check over your tune again and make sure that everything is set the way you need it to. I know we corrected a bug or 2 that were affecting 15+ Hellcats/SRTs recently in beta.

  11. #11
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    Just finished one up. Was having a lot of issues with map sensor rationality checks, torque calculation and getting the etc light @ idle in neutral with p2110. I had to go through and find all of the map checks, the pwm threshold @ idle and the engine torque calculation table and have them all added so that i could get it right. Car drives perfect now. No limp mode driveability is perfect.

  12. #12
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    Ask Mark to add the stuff i requested and you should be able to dial it in.

    Btw hpt still hasn't added the parametet to open the throttle fully for whatever reason. I did find it though

  13. #13
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    I keep catching limp mode in new ways on this 2016 hellcat - it seems that everything is logically set to just not car how much airflow it sees- currently P0069
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    Doc
    Doc's Performance & Dyno Tuning - Las Vegas NV . Tuning any and all cars!

  14. #14
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    Quote Originally Posted by DRTurbo View Post
    I keep catching limp mode in new ways on this 2016 hellcat - it seems that everything is logically set to just not car how much airflow it sees- currently P0069
    There are offsets for map baro correlation which can be opened up to remedy that. Have them added

  15. #15
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    do you have a email address so i can send you my hellcat calibration having trouble with U1424 P012B whipple 4.5 id 1300cc

  16. #16
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    Quote Originally Posted by edgar View Post
    do you have a email address so i can send you my hellcat calibration having trouble with U1424 P012B whipple 4.5 id 1300cc
    Try entering these parameters :
    https://photos.app.goo.gl/khrT6JCkbiJDHUxz9
    If fixed my U1424 code. I don't know how it worked, but it did.