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Thread: Connecting & Tuning Knock Sensors - Holley EFI

  1. #21
    Join Date
    Feb 2015
    Location
    Melbourne, Florida
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    176

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    Danny, just wanted a second opinion on my start. I've got a 4.070" bore, so based on that graph, I'm thinking it puts me about 5.66.

    Also, was wondering what you thought about setting up a small 10 RPM cell in the map to bump timing for in just a little spot to calibrate. I have to drive at least an hour to find a hill, unless I use a highway overpass. Hoping to use this method on a blower motor we are building for a boat. I've used the single wires a few times, but first 2-wire attempts very soon.

    No input on this idea, to create a short knock where loading is not as simple as a hill?
    Shawn Dickens
    Builder/Tuner at www.waterthunder.com
    Chevy LS Airboat Motor Specialists

    Technical Adviser for www.holleyinjection.com
    A site owned & managed by Cyber Space Automotive.
    Authorized Holley EFI Dealer

  2. #22
    Join Date
    Dec 2009
    Location
    Connecticut
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    19,283

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    Quote Originally Posted by The Dickens
    Also, was wondering what you thought about setting up a small 10 RPM cell in the map to bump timing for in just a little spot to calibrate.
    I don't fully understand what you mean, so I couldn't comment. I've only tuned knock sensors the way I described in post #1 (and it worked extremely well).
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  3. #23
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    Feb 2015
    Location
    Melbourne, Florida
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    Well in my car I can find a hill, but not very easy. I will have to use an overpass I guess.

    The boat engines are a lot tougher. We have a thrust analyzer that runs them on, to test & tune new engines and that's bolted to the ground. I could pitch the prop to add more load, but was hoping I could limit knock to a very small window. I was thinking I change the RPM axis to read 2300 2500 2505 2510 2700 2900, and then just keep upping the timing in the 2505 column until it pings going through that 10 RPM range. Then I can sweep passed it and just datalog & adjust until I get it right. Not sure if that is a good way to go, but it's the best I've come up with so far.

    The other part was on the frequency. I've only done single wire ones to this point, and I'm not sure how exact I need to figure out that broad graph. I'm about to do a 4.070" & 4.130" bore. None of these fall on a cross hair of the graph. Thanks.
    Shawn Dickens
    Builder/Tuner at www.waterthunder.com
    Chevy LS Airboat Motor Specialists

    Technical Adviser for www.holleyinjection.com
    A site owned & managed by Cyber Space Automotive.
    Authorized Holley EFI Dealer

  4. #24
    Join Date
    Jul 2016
    Location
    Tucson AZ
    Posts
    42

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    Danny, don't know if this is the appropriate spot for this, but I'm adding an HP EFI system to my ZZ572 Chevy big block. That engine has a threaded boss above the starter, next to the rear freeze plug on the passenger side, where I could attach the sensor. But that spot is pretty low on the block. Will it cause tuning problems with the knock sensor? Which knock sensor should I use? You've recommended the stock GM part (GM #10456288). Is that a 1-wire or 2-wire knock sensor?

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    Last edited by fitz; 08-10-2016 at 11:27 AM.
    You can never have too much horsepower.

  5. #25
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    Dec 2009
    Location
    Connecticut
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    Quote Originally Posted by fitz View Post
    But that spot is pretty low on the block.
    Read "Recommended Mounting Locations" in post #1.

    Will it cause tuning problems with the knock sensor?
    You tell me. This is user programmable aftermarket EFI. You must test everything.

    Which knock sensor should I use?
    I don't have that engine, so I can't answer that question.

    You've recommended the stock GM part (GM #10456288). Is that a 1-wire or 2-wire knock sensor?
    It's a 1-wire knock sensor, as described & pictured in post #1.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  6. #26
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    Jul 2016
    Location
    Tucson AZ
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    Thanks for your prompt reply.
    You can never have too much horsepower.

  7. #27

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    Danny have you had any dealing or information on the two wire sensors? I have several new take off from GM Crate engines and would not mind putting them to use. The sensor number is GM #12623730 or ACDelco #213-1576: https://www.amazon.com/ACDelco-213-1...words=12623730. Thanks

  8. #28
    Join Date
    Dec 2009
    Location
    Connecticut
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    I haven't used them, but there's plenty of information about them on the internet.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

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