Does the VTEC capability work with VCMuzzler II
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Thread: Does the VTEC capability work with VCMuzzler II

  1. #1
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    Does the VTEC capability work with VCMuzzler II

    I have a 2006 Odyssey EX-L and was wondering if the VCMuzzer II disables VTEC as well?

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    It only affects cylinder deactivation which happens when there's little to no engine load. Adding the muzzler will make the van feel smoother and slightly more powerful.
    Mike
    07 EX-L RES/NAV

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    2000 Odyssey LX
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    Plus it will prevent engine damage (piston rings) caused by the VCM, excessive oil consumption, misfires, and prematurely worn engine mounts.
    2010 Honda Odyssey EX-L
    110,000 miles

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    Quote Originally Posted by tekennelly View Post
    I have a 2006 Odyssey EX-L and was wondering if the VCMuzzer II disables VTEC as well?
    No VTEC is not affected, just VCM.

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    Quote Originally Posted by MrRangerZr1 View Post
    No VTEC is not affected, just VCM.
    So, VTEC is not affected by the engine running slightly below operating temperature which is what disables VCM? I did read all of the VCMuzzler FAQ and could not find this question addressed.

    I ask because I do not feel the VTEC kick since I have installed the VCMuzzler II BUT, I COULD BE MISTAKEN. One of this days I will ground out the green wire to reactivate VCM and do some full throttle tests to see if I can determine the feel of VTEC kicking in.

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    Remember that the VCM Muzzler devices do not have any effect on the engine operating temperature. It only "fools" the engine computer to think that it is running below operating temp.
    2010 Honda Odyssey EX-L
    110,000 miles

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    I think that you are confusing yourself between when the VCM kicks in and actual i-Vtec operation. The i-Vtec in this engine kicks in at over 4600 RPM. Are you reving it this high all the time?

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    Quote Originally Posted by thscott View Post
    Remember that the VCM Muzzler devices do not have any effect on the engine operating temperature. It only "fools" the engine computer to think that it is running below operating temp.
    So the computer is fooled, right? Does VTEC operation require the computer to think the engine is at operating temperature because the VCMuzzler fools the computer about the temperature? Once the computer is being fooled other computer functions could be affected by the computer believing the engine is not at operating temperature.

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    Quote Originally Posted by jackrabbit000 View Post
    I think that you are confusing yourself between when the VCM kicks in and actual i-Vtec operation. The i-Vtec in this engine kicks in at over 4600 RPM. Are you reving it this high all the time?
    No confusing here. I know what VCM does and when it does it. Likewise I have experienced VTEC when I open the throttle to max.

    As I said in a previous post, once the computer is being fooled by believing it is not running at operating temperature, thereby negating VCM, does it also negate VTEC.

    So, the question really becomes one of does the computer allow VTEC operation at below engine operating temperatures? Yes, the engine is really at operating temperature but the computer doesn't know that because VCMuzzler is fooling it.

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    You have now framed your VTEC question correctly. Sadly, I do not know the answer.
    2010 Honda Odyssey EX-L
    110,000 miles

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    There should be no change. VTEC should work whether the engine is up to operating temp or not and as you know, all the muzzler does is make it look like the engine is not up to temp. Some say these VCM engines do not really have true VTEC.
    Mike
    07 EX-L RES/NAV

    Sold at 202k miles
    2000 Odyssey LX
    Trans at 82k -- Tru-cool trans cooler
    DIY Timing Belt at 104k
    Hidden Hitch & Airlift 1000's

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    So throttle position determines V-tech operation and not the computer? In other words, with the VCM muzzled, the V-Tech will kick in if you floor it anyway?

    I thought I read here once that the VCM engines did not really have V-Tech anyway? Maybe I remember that wrong?

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    Quote Originally Posted by egads View Post
    So throttle position determines V-tech operation and not the computer? In other words, with the VCM muzzled, the V-Tech will kick in if you floor it anyway?

    I thought I read here once that the VCM engines did not really have V-Tech anyway? Maybe I remember that wrong?
    No, they do. The VCM engines in Odysseys have i-VTEC, which incorporates both variable valve lift (intake side only) and variable timing control. With that said, it is a system tuned towards economy rather than power. An Odyssey will not press you into your seat the way an Integra Type R or S2000 do, no matter how hard you hammer the gas.

    The PCM controls the VTEC solenoid valve and I believe it monitors a bunch of parameters (things like oil pressure, engine load percentage, throttle position, open or closed loop would be a few I'd imagine would be important but I don't know the true list) to know when to kick the VTEC on or off. I don't think I've read anywhere that says VTEC won't activate on a cold engine. If someone was really curious about that, it wouldn't take much to pin the gas one morning before the engine has a chance to warm up and see whether they notice anything. The Muzzler wouldn't matter because a cold engine is a cold engine - a few degrees up or down won't make a difference. Your neighbours might think you're a maniac, but nothing bad would happen to the engine. <img src="https://www.odyclub.com/forums/images/smilies/biggrin.gif" border="0" alt="" title="Big Grin" class="inlineimg" />
    Last edited by CroMath; 04-26-2019 at 06:39 PM.
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    Bottom line is that my Muzzled 2010 EXL runs fine. Power is fine, and gas mileage is fine. And the engine is smooth, which is as it should be.

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    Just to keep this question focused and not let it drift off to whether VCMuzzer II is good or bad I am really interested in any affects on I-VTEC. So, let me say I like my VCMuzzler II and now we can move on.

    CroMath has suggested a full throttle acceleration test on a colder engine. I would like to find a more objective way to answer my question. One thought I had was to see if there is a voltage/no voltage on the VTEC solenoid but I don't want to cut into the wires. So I am still thinking about how to get to my answer.

    On other Honda forums, not associated with the Odyssey, there are posters that are convinced VTEC does not operate on a cold engine. If I determine that VTEC doesn't work on a cold engine I think the VCMuzzler II could be reprogrammed such that its accelerometer might be able to detect hard acceleration and temporarily disable VCM muzzling. Note that the VCMuzzler II has an accelerometer to allow a throttle position reset, what ever that is, after the car has idled for 2 minutes straight.

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