18 vortech v7-JT knock issue

Discussion in 'Forced Induction - 5.0L V8 Engine' started by Dustind6327, May 17, 2020.

  1. Dustind6327

    Dustind6327 Member

    Vehicle(s):
    18 gt
    Joined:
    Jan 13, 2019
    Location:
    Louisiana
    Posts:
    7
    Likes Received:
    1
    0   0   0
    Having an issue with knock up top, 2-4* my setup is gen 3 v7-JT headunit 3.1 pulley, triple 465s, I’ve checked 100xs for false knock can’t find anything, E test around 88. Anyone else have this setup afr, lamb everything is good, just starts pulling right at every shift. Timing is around 21-22, once this E is out the tank I’m gonna try ingnite red just to see if it’s fuel related, don’t think it is cause other local cars making more power than me on same pump E
     
  2. Kermitz

    Kermitz Well-Known Member

    First Name:
    Seth
    Vehicle(s):
    2019 Mustang GT PP1 300A M6
    Joined:
    Dec 22, 2018
    Location:
    Vacaville CA
    Posts:
    602
    Likes Received:
    507
    Garage Profiles:
    1
    Occupation:
    Pipe Layer
    Rating:
    100%
    1   0   0
    It's probably either the supercharger head unit knocking against the elbow on the throttle body during shifts or the plastic intake duct knocking on the fan shroud. These two issues are well documented and Alex Flores a tuner from Lund Racing has a video about it.
     
  3. GuardGT

    GuardGT is currently pooping

    Vehicle(s):
    2018 Crimson GT 10r80
    Joined:
    Nov 16, 2015
    Location:
    CA
    Posts:
    310
    Likes Received:
    111
    0   0   0
    I chased false knock for 2 months, using adhesive back weatherstrip on everything from the hood prop to wrapping all hard lines in coolant hose. Finally found it with my stubby filter knocking on the radiator shroud, but only under engine torque. Look for things that might hit when the motor torques (any hard parts that are less than 1/4” away from touching), and double check all of your exhaust for leaks and rattles. Also, check your intercooler piping IN the couplers, make sure they aren’t so close (inside of the coupler) that they could tap under load
     
  4. OP
    OP
    Dustind6327

    Dustind6327 Member

    Vehicle(s):
    18 gt
    Joined:
    Jan 13, 2019
    Location:
    Louisiana
    Posts:
    7
    Likes Received:
    1
    0   0   0
    Head units not near the throttle body at all and just has a turbo guard on it no filter
     
  5. OP
    OP
    Dustind6327

    Dustind6327 Member

    Vehicle(s):
    18 gt
    Joined:
    Jan 13, 2019
    Location:
    Louisiana
    Posts:
    7
    Likes Received:
    1
    0   0   0
    What Rpms did yours mainly show knock? I’ve checked all that it’s all good
     
  6. BlackandBlue

    BlackandBlue Well-Known Member

    First Name:
    Jay
    Vehicle(s):
    2018 GT 10 Gear
    Joined:
    Jun 27, 2019
    Location:
    Southeast
    Posts:
    1,154
    Likes Received:
    756
    0   0   0
    Jack car up and bang on exhaust with rubber mallet. Listen for rattles.
     
  7. GuardGT

    GuardGT is currently pooping

    Vehicle(s):
    2018 Crimson GT 10r80
    Joined:
    Nov 16, 2015
    Location:
    CA
    Posts:
    310
    Likes Received:
    111
    0   0   0
    It usually matches directly up with 100% throttle input, but sometimes it was all over the place. I can send you my logs if you’d like.
     
Loading...

Share This Page