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  1. #1
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    Long Tube Headers and False Knock

    Have any of you that installed long tube headers discovered that the your car picked up a false knock signal which retards timing, and thus restricts power?

    I'd like to install long tubes and run a before and after dyno to monitor the amount of torque and horsepower that they increased. I had just did that with a LMI 392 True CAI.

    After the upgrade of intake and headers without a tune, then I wanted to see how much a tune would help.
    Terry

    2005 Magnum RT load runner 2.6: Inertia Motorsports 419 Stroker, Predator Tune: 475rwhp & 465rwtq, Crower Cam, Kook's Headers, 3 inch "Custom" Exhaust, Tunable Induction Intake, NAG1-HTC Tranny, 3.55 Gears, 600hp DSS Half-Shafts, TrueFiber Challenger Hood, Enkei Wheels 18"x9", MT 28.00" / 12.00" x 18" radials on rear, Paneled Rear Side Windows, GoManGo Front Seats, Eibach Springs/Dampers, Wilwood Calipers, Rear Wiper Removed, Billet Technology enhancments.
    2019 Octane Red Charger GT
    1999 Plymouth Prowler (yellow) Prowler Pro #11
    2020 Charger Scat Pack Widebody

  2. #2
    Join Date
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    Yes I have false knock with Lt headers on a 6.1. And yes I did a before and after with the lmi but not on the Dyno at the track and picked up 3/10. My time slips are in his Facebook page
    The lmi true cold air is no joke. It works


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  3. #3
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    Turn off the knock sensors and runs the test passes.

  4. #4
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    I left the sensors turned on. AJ said there’s no harm in it. It’s a street car so I don’t care


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  5. #5
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    Quote Originally Posted by Renfrick1 View Post
    Yes I have false knock with Lt headers on a 6.1. And yes I did a before and after with the lmi but not on the Dyno at the track and picked up 3/10. My time slips are in his Facebook page

    sent from my iPhone using Tapatalk
    Quote Originally Posted by DBL.DWN View Post
    Turn off the knock sensors and runs the test passes.
    Quote Originally Posted by Renfrick1 View Post
    I left the sensors turned on. AJ said there’s no harm in it. It’s a street car so I don’t care


    Sent from my iPhone using Tapatalk
    Let me try to get some clarity on the above posts:
    1. Is it safe to say that both of you have a tune? Isn't that how it is possible to turn the knock sensors on/off?
    2. If the knock sensors detect the knock, whether it is an actual knock or a false knock, doesn't the computer pull the timing, and thus lose power?
    Terry

    2005 Magnum RT load runner 2.6: Inertia Motorsports 419 Stroker, Predator Tune: 475rwhp & 465rwtq, Crower Cam, Kook's Headers, 3 inch "Custom" Exhaust, Tunable Induction Intake, NAG1-HTC Tranny, 3.55 Gears, 600hp DSS Half-Shafts, TrueFiber Challenger Hood, Enkei Wheels 18"x9", MT 28.00" / 12.00" x 18" radials on rear, Paneled Rear Side Windows, GoManGo Front Seats, Eibach Springs/Dampers, Wilwood Calipers, Rear Wiper Removed, Billet Technology enhancments.
    2019 Octane Red Charger GT
    1999 Plymouth Prowler (yellow) Prowler Pro #11
    2020 Charger Scat Pack Widebody

  6. #6
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    The knock sensors can have their sensitivity altered without turning them completely off. CMR tune required.
    Old 426 guy,
    Jim

  7. #7
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    Quote Originally Posted by RT NOMAD View Post
    Let me try to get some clarity on the above posts:
    1. Is it safe to say that both of you have a tune? Isn't that how it is possible to turn the knock sensors on/off?
    2. If the knock sensors detect the knock, whether it is an actual knock or a false knock, doesn't the computer pull the timing, and thus lose power?
    Yes the knock sensor will pull timing (and lose power) if it correctly or falsely picks up a knock.
    I dont see the need for them.

  8. #8
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    Yes I have a blower and tune. I left them on for safety. I’m not out to break records. I trust AJ ‘s tune but like I said. I’m out having fun. I don’t care if it pulls timing


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  9. #9
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    Quote Originally Posted by Renfrick1 View Post
    Yes I have a blower and tune. I left them on for safety. I’m not out to break records. I trust AJ ‘s tune but like I said. I’m out having fun. I don’t care if it pulls timing


    Sent from my iPhone using Tapatalk
    That explains it!

    PB ET 14.02 at CamaroFest 5 totally stock
    PB RT Sportsman tree .003 at Challengerfest 3, PB RT pro tree .019 at MSHS VMP 5/16
    PB 0-60 3.24 MIR Raceway Drag Radials 6/18

    PB 0-60 4.40 Street Tires on the street Calabash 10/14

    PB 60' 1.472 @ CF9 4/18
    PB ET 1/8 6.911 @ CF9 4/18
    PB MPH 1/8 101.32 @ The Rock 4/19
    PB ET 10.857 @ CF9 4/18

    PB MPH 127.29 @ Atco 11/18

  10. #10
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    Nov 2010
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    Let’s race !!


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