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Lag - Delay - Hesitation

CH 12 May 7, 2017

  1. cuke2u

    cuke2u Well-Known Member

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    Not completely sure it is for all zf hp8 gearboxes, from what I understand it is for more recent models, such as your s4...
     
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  3. Gazwould

    Gazwould Registered User

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    Oh and open the drivers door and leave for 10 mins before unplugging to let the Canbus calm down .
     
  4. Spearo

    Spearo Registered User

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    Well I can update this thread, unfortunately without anything resembling a fix, however I can dispel some of the supposed fixes !

    so being frustrated with the gearbox / throttle lag I bought myself a sprint booster with the intention of giving it a the benefit of the doubt ! I say that because I already suspected that the fbw throttle wasn’t the cause .... anyway, it came, I plugged in and played .........

    The result- sure more immediate throttle response, which some may appreciate, but personally I think I can mash the pedal into the carpet fast enough already if needs be.
    However - regardless of the increased responsiveness of the accelerator pedal the gearbox still takes an age to fully engage.... the sprint booster does nothing to alleviate the slow speed of lock-up of the gear boxes clutch packs.
    The most worrisome thing about the sprint booster is the negative effects it has of the drivability of the gearbox /car. there are two main problems:
    1) after slowing down for a roundabout etc. the Car retains too high a gear . I kept finding that instead of exiting a roundabout in say 3rd gear, as the car did before the SB , I’d find the gearbox was still in 5 or even 6th gear !!! Meaning a manual flip of the paddles to get the correct gear to pull away.
    2) The increased sensitivity of the accelerator pedal causes twitches or light presses of the accelerator to act like a kick down movement. Even a toe reposition on the pedal during a long drive was enough to cause a Fantom shift from 8th to 6th ....

    all in all I’m dissatisfied with the SB as a fix - tomorrow it gets unplugged and returned ..... think I’ll be waiting for a proper gearbox tune ...
     
  5. syed123

    syed123 Registered User

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    Which engine do you have?

    I have a mapped 272 also have a tmc motorsport gearbox tune and dtuk pedal box. It works together so well and there isn't much lag.

    Car is also really driveable

    Its so worth considering a gearbox tune, really firms up the gear changes and changes the whole feel of the car
     
  6. Dingah from Downundah

    Dingah from Downundah Dingah's office

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    If you were driving a manual would you roll into it in top gear? I suspect the answer is no.
    Approaching such situations is it too hard to paddle down a couple of gears or to select Sport mode?
    That said I find the V6 S4 has no such issue - perhaps the DTUK ECU relationship may have some impact.

    Dingah
     
  7. Spearo

    Spearo Registered User

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    So this is in the V6 S4

    Dingah- my point was that previously the car did a good job of selecting the appropriate gear related to speed in order that I didn’t have to toggle gears manually.... with SB fitted the car doesn’t respond as nicely
     
  8. Spearo

    Spearo Registered User

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    If I’m on a flyer then I always drive completely manual in Dynamic/sport mode - but when I’m just driving around town, it just stays in auto.
     
  9. Gazwould

    Gazwould Registered User

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    Sorry to hear that the SB only improved throttle response for you , I've got none of those negative issues you speak of , only positives and the best £195 I've spent on a car in a long time , it really must be on a individual car type basis but great they have a 30 day satisfaction return .

    Yes a gearbox flash tune is the only option for you now , but they can be equally as controversial , it'll either work or it won't .
     
  10. cuke2u

    cuke2u Well-Known Member

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    Why not talk to dtuk before giving up..
     

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