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  1. 02-10-2019 05:47 PM #1
    RoofRails
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    Wow...... The ZF 8hp

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    https://youtu.be/FqyPizRyphQ

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  2. 02-11-2019 08:38 AM #2
    PNW Avant
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    Pretty crazy. I had to watch some other auto trans educational videos to make any sense of this. I could barely understand 6 speeds!

    Interesting that each series of the 8HP has a different power rating. Looks like we have the “8HP55” which is rated to 550 ft/lb of torque. Good to know!


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  3. 02-11-2019 08:48 AM #3
    Q5OnTheMove
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    Quote Originally Posted by PNW Avant View Post
    Pretty crazy. I had to watch some other auto trans educational videos to make any sense of this. I could barely understand 6 speeds!

    Interesting that each series of the 8HP has a different power rating. Looks like we have the “8HP55” which is rated to 550 ft/lb of torque. Good to know!


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    8HP55 is actually 500 newton meter which translates to 405 ft-lbs.
    2016 Q5 3.0T GIAC Stage 2, HP tuners TCU tune with help from P3U and BG SQ5, aFe 11-10121 Pro Dry S filter, 034 Throttle body hose, AWE Cold Front Heat Exchanger

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  4. 02-11-2019 08:51 AM #4
    PNW Avant
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    Wow...... The ZF 8hp

    Ah good catch... seems like many here are surpassing that figure with mods and tunes....

    Wikipedia says 550nm

    https://en.m.wikipedia.org/wiki/ZF_8HP_transmission

    But perhaps the rating is at the output, not input?

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  5. 02-11-2019 12:29 PM #5
    Pittdawg
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    Quote Originally Posted by Q5OnTheMove View Post
    8HP55 is actually 500 newton meter which translates to 405 ft-lbs.
    That makes no sense; the TDI comes stock with 428 ft-lbs.
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  6. 02-11-2019 01:20 PM #6
    Q5OnTheMove
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    Quote Originally Posted by Pittdawg View Post
    That makes no sense; the TDI comes stock with 428 ft-lbs.
    I was answering the question on 8hp55. I never claimed thats what the tdi has. Raise thd vehicle and check part numbers to see which transmission the tdi has.
    2016 Q5 3.0T GIAC Stage 2, HP tuners TCU tune with help from P3U and BG SQ5, aFe 11-10121 Pro Dry S filter, 034 Throttle body hose, AWE Cold Front Heat Exchanger

    93 octane tune (0-60mph 3.90 seconds (1 ft rollout), 0-60mph 4.12 seconds, 1/4 12.31 secs @ 112.40, 0-60ft 1.90 seconds)

    Race 104 octane tune (0-60mph 3.70 seconds (1 ft rollout) , 0-60mph 3.89 seconds, 1/4 12.09 secs @ 115.34, 0-60ft 1.88 seconds)
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  7. 02-11-2019 02:47 PM #7
    djn876
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    ZF uses the last two digits to specify the torque rating. 55 is 550 NM, 70 is 700 NM, etc. So for us it is 550 NM or about 405 lb ft, as previously stated.

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  8. 02-11-2019 02:51 PM #8
    PNW Avant
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    I think wikipedia just has some bad information.

    ZF documents say the 8HP55A can take 650nm. So more like 480 ft/lbs.

    https://www.yumpu.com/en/document/re...drichshafen-ag
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  9. 02-11-2019 02:56 PM #9
    djn876
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    The 55A was a higher torque variant of the 55 made for some specific vehicles if I remember from reading before about these. Sometimes they provide a higher torque rating for diesel applications so likely the internals are a little different even if the trans model is the same.

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  10. 02-11-2019 03:29 PM #10
    PNW Avant
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    If I take these two sources together, the Q5's have the "0BK" transmission, which Ross Tech says is a "ZF 8HP55AF" with 700nm max torque.... The Q5, Q5 TDI and SQ5 transmissions all start with code "0BK" but ultimately have slightly different part numbers. Certainly possible they are slightly different variants, but I doubt it.

    I can't really find anything about the "8HP55" without the "A".

    "OBK" Trans code
    https://audiparts.audiwilmingtonde.c...-0bk300042d002

    0BK = 8HP55A
    http://wiki.ross-tech.com/wiki/index...:Transmissions
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  12. 03-03-2019 03:18 PM #11
    Pittdawg
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    Quote Originally Posted by PNW Avant View Post
    If I take these two sources together, the Q5's have the "0BK" transmission, which Ross Tech says is a "ZF 8HP55AF" with 700nm max torque.... The Q5, Q5 TDI and SQ5 transmissions all start with code "0BK" but ultimately have slightly different part numbers. Certainly possible they are slightly different variants, but I doubt it.

    I can't really find anything about the "8HP55" without the "A".

    "OBK" Trans code
    https://audiparts.audiwilmingtonde.c...-0bk300042d002

    0BK = 8HP55A
    http://wiki.ross-tech.com/wiki/index...:Transmissions
    That's my point, there's many modified 3.0T (Q5s and SQ5s) well north of 400 hp and 400 tq; meaning many would have grenaded their transmissions by now if they were limited to just 405 ft-lbs tq. 500 ft-lbs tq is much more likely to be accurate in my informed estimate.
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  13. 03-03-2019 05:14 PM #12
    PNW Avant
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    Yeah that clearly made no sense so I tracked down the facts. Lots of misinformation apparently.


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