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Thread: ZF8HP70 Jaguar F-Type R Shift feel for gears 1-8

  1. #1
    Potential Tuner
    Join Date
    Mar 2024
    Posts
    5

    Jaguar F-Type R RWD Transmission Tune.

    Let's go over what i feel in my Car.

    All the shifting was done in Manual mode and with LOW Torque and HIGH Torque.

    Stock file:

    1-2 feels alright (it jerks a bit but thats to be expected cuz tall 2nd gear)
    2-3 feels okay (not great)
    3-4 feels very snappy almost a bit to snappy
    for my taste below 2200rpm, feels good above 2200rpm
    4-5 feels good in every rpm range
    5-6 feels good below 2500rpm, feels like trash above 2500rpm (car jerks back and it feels very unsmooth/rippy)
    6-7 feels good in every rpm range
    7-8 feels good in every rpm range

    My Tune:

    Edit 1:
    3-4 shift feeling snappy was just to much clutch pressure!
    After lowering the pressures by 0,5 bar in the 1500-2000rpm range it feels way better and smoother. (clutches might suffer from it)
    I also changed the Tq Management and added -12nm in the 2400rpm and 3200rpm rows to compensate the less pressure

    Edit 2:
    5-6 Gear change was feeling crap because there was to little fill offset and to low of a clutch pressure i raised pressure in the upper Tq regions by almost 1 bar!
    It now feels way better/faster and not lumpy anymore i also left Tq management stock.
    Changing the Tq management makes it smoother not faster. Because the clutches have to take all the energy and you compensate by using the friction material creating most likely heat and wearing the clutch.

    Edit 3:
    I noticed after some changes in the shift schedule for the M maps the 4-5 shift when shifting at 1400-1500rpm the shift clunks sometimes indicating either too much pressure or too much tq management. (working on it)

    Edit 4:
    4-5 shift had definetly too much pressure reduced the 1000-1700rpm range pressure tables by 1.0 bar in the upper tq tables. Simple easy fix makes it smooth and no clunking anymore.

    Edit 5:
    Noticed that 7-8 sometimes clunks aswell,
    Stock pressure got reduced by 0.5 bar in the upper tq regions.

    My conclusion now for the ZF8HP70 in the Jaguar F-Type R RWD is that most of the issues are pressure related and by just reducing these pressures in the problem areas most of the "feel" issues are solved.

    Since we are here already the safe RPM limit for the 5.0Liter V8 Supercharged is 7000rpm this should never be exceeded since the valve springs aren't stiff enough to handle more.
    (Everyone going over that is asking for engine damage)
    You don't see much power over 7000rpm so you basically wasting time energy and putting strain on the engine.

    This will be further updated as i gain more accurate Information.
    Last edited by RandomStranger; 10-11-2024 at 07:52 PM.