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Forum: V8 Engine Tech

Technical discussion on all aspects of VAG 4.2 and 5.2 V8 tuning and tech. Sponsored by JH Motorsports.

JH Motorsports
  1. B7 4.2 V8 Factory A/C Compressor RPM

    Started by WileyBrill, 03-22-2025 08:36 AM
    • Replies: 0
    • Views: 1,620
    03-22-2025, 08:36 AM Go to last post
  2. B8.5 oil in drivers air box

    Started by Tummyshirt162, 02-26-2025 08:20 PM
    • Replies: 0
    • Views: 198
    02-26-2025, 08:20 PM Go to last post
  3. Unhappy 4.2 v8 Misfire in Cylinder Four

    Started by Happypopda, 02-04-2025 06:33 AM
    • Replies: 0
    • Views: 597
    02-04-2025, 06:33 AM Go to last post
  4. S5 4.2 v8 water/meth injection for carbon?

    Started by Zingrox, 10-02-2017 06:46 PM
    • Replies: 25
    • Views: 11,982
    01-30-2025, 11:39 PM Go to last post
  5. Flapper delete

    Started by Bhannah510, 09-16-2024 06:36 PM
    • Replies: 0
    • Views: 1,557
    09-16-2024, 06:36 PM Go to last post
  6. So Many JHM Supercharged Vehicles for Sale

    Started by wahpao, 02-24-2017 08:39 AM
    • Replies: 7
    • Views: 8,353
    08-14-2024, 03:34 PM Go to last post
    • Replies: 0
    • Views: 2,580
    06-02-2024, 11:31 PM Go to last post
  7. Throttle Body Not Calibrating-S4 B7

    Started by Mar'd, 03-31-2023 10:37 AM
    • Replies: 2
    • Views: 2,677
    05-14-2024, 07:33 AM Go to last post
    • Replies: 0
    • Views: 1,110
    05-02-2024, 08:45 AM Go to last post
    • Replies: 0
    • Views: 1,002
    04-22-2024, 10:01 PM Go to last post
  8. 4.2 FSI (BAR) Oil leak

    Started by mithril, 02-06-2024 07:51 PM
    • Replies: 0
    • Views: 939
    02-06-2024, 07:51 PM Go to last post
    • Replies: 0
    • Views: 871
    01-25-2024, 06:48 AM Go to last post
  9. Need help with cylinder head bvj vs bar

    Started by Fattyneff, 01-07-2024 09:44 AM
    q7 4.2 bar bvj
    • Replies: 0
    • Views: 1,147
    01-07-2024, 09:44 AM Go to last post
    • Replies: 2
    • Views: 4,100
    12-28-2023, 10:35 PM Go to last post
  10. New 4.2fsi long block from Audi

    Started by Mugelloblu42, 02-06-2023 09:29 AM
    • Replies: 1
    • Views: 2,734
    10-23-2023, 07:59 AM Go to last post
  11. Audi s5 b8 09 v8

    Started by Shabayaba, 09-26-2023 06:51 AM
    audi s5 b8 v8
    • Replies: 0
    • Views: 856
    09-26-2023, 06:51 AM Go to last post
    • Replies: 0
    • Views: 1,345
    04-21-2023, 11:22 AM Go to last post
  12. Needing a Audi / RS4 Mechanic / Tech

    Started by Dzicch, 04-11-2023 04:50 PM
    • Replies: 0
    • Views: 1,195
    04-11-2023, 04:50 PM Go to last post
  13. Ported JHM head noise--valve guides too short?

    Started by Andrew J, 03-12-2022 10:57 AM
    • Replies: 2
    • Views: 2,465
    03-26-2023, 05:34 AM Go to last post
  14. ABZ V8 as a stand alone. Which wires do I need?

    Started by DR.Death, 03-25-2023 10:38 PM
    • Replies: 0
    • Views: 1,509
    03-25-2023, 10:38 PM Go to last post
  15. No Crank no start , b6 s4

    Started by Rcryan7, 03-07-2023 11:20 AM
    • Replies: 1
    • Views: 1,322
    03-16-2023, 09:22 AM Go to last post
  16. 2011 S5 4.2 cyl 1 misfire

    Started by Jaymehaze, 09-30-2020 08:35 AM
    • Replies: 4
    • Views: 3,704
    11-18-2022, 07:01 AM Go to last post
  17. BNS repair manual??

    Started by Mugelloblu42, 01-24-2022 08:06 PM
    • Replies: 1
    • Views: 2,647
    10-24-2022, 01:39 PM Go to last post
    • Replies: 5
    • Views: 16,623
    10-17-2022, 04:38 PM Go to last post
  18. 4.2 intake flapper issue

    Started by B76767, 10-13-2022 08:26 AM
    • Replies: 1
    • Views: 2,230
    10-17-2022, 12:30 PM Go to last post
  19. RS7 exhaust

    Started by JpRS7, 10-10-2022 04:54 AM
    exhaust
    • Replies: 0
    • Views: 1,554
    10-10-2022, 04:55 AM Go to last post
  20. B6 S4 Tune unknown!

    Started by jamboravr6, 09-05-2022 07:39 PM
    • Replies: 0
    • Views: 1,830
    09-05-2022, 07:39 PM Go to last post
  21. Touareg 4.2 AXQ timing belt screw up?

    Started by rickyw59, 06-20-2022 03:24 PM
    • Replies: 1
    • Views: 3,177
    07-04-2022, 06:52 PM Go to last post
  22. Can't find this vacuum leak...

    Started by motionvega, 04-29-2022 08:42 PM
    • Replies: 0
    • Views: 2,441
    04-29-2022, 08:42 PM Go to last post
  23. 40V Swap - 987.1 Cayman SCHOOL ME HERE

    Started by bkwrzdub, 03-30-2022 10:34 AM
    • Replies: 3
    • Views: 6,844
    04-12-2022, 09:14 AM Go to last post
  24. B6 S4; time for timing service?

    Started by Hydr0, 01-16-2022 09:03 AM
    • Replies: 0
    • Views: 2,890
    01-16-2022, 09:03 AM Go to last post
  25. B6 B7 Throttle body measurements needed!

    Started by Cgaines98, 12-10-2021 05:25 PM
    • Replies: 0
    • Views: 2,354
    12-10-2021, 05:25 PM Go to last post
  26. Misfire bank 1

    Started by Slicknick97, 10-21-2021 01:24 PM
    • Replies: 1
    • Views: 2,622
    11-30-2021, 07:15 AM Go to last post
  27. Audi S5 V8 4.2l (CAUA): fuel return line

    Started by Silv3r, 01-06-2019 10:50 AM
    • Replies: 5
    • Views: 15,975
    10-12-2021, 10:12 AM Go to last post
  28. What plug/sensor is this??

    Started by NickDee, 08-27-2021 07:50 AM
    • Replies: 0
    • Views: 2,385
    08-27-2021, 07:50 AM Go to last post
  29. 2005 Audi S4 P0345 Camshaft Position Sensor

    Started by B7818, 06-29-2021 10:12 AM
    • Replies: 0
    • Views: 3,365
    06-29-2021, 10:12 AM Go to last post
  30. Question 4.2L O2 Sensor Codes. Easy fix?

    Started by Squenz, 05-08-2021 08:47 AM
    p2006, p2007, p2198
    • Replies: 0
    • Views: 2,797
    05-08-2021, 08:47 AM Go to last post
  31. Oil in spark plug wells

    Started by VdubB6, 04-29-2021 05:42 PM
    • Replies: 0
    • Views: 2,704
    04-29-2021, 05:42 PM Go to last post

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