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Quiet Bimodel mufflers on VF1, ... wheres the noise?

Discussion in 'VF Holden Commodore (2013 - 2017)' started by Doug 1969, Oct 2, 2017.

  1. monstar

    monstar Naturally as-pirated

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    I know about the Baillie Tip and Mechanical Soubd Enhancer, but where did you get the information about the minutes sprays of fuel purposefully to create the third pillar in the Aural Stimulation Program?
    By the way it is unlikely while doing a drive-by where the non-factory spec exhaust will fail, it is stationary at less than one metre away from tips, at 75% max RPM then let off, as in cops know the snap crackle and pop will put you over the noise threshold.
     
  2. KT11H

    KT11H Active Member

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    An article in the Go Auto.com.au by Ian Porter interviewing Holden Chief Engineer - Andrew Holmes - under the heading "VFII Commodore pumps up the volume". Dated 14/9/2015. In the article, A Holmes stresses that minutes amount fuel sprayed into the exhaust system doesn't affect the overall fuel consumption.
     
  3. Smitty

    Smitty Well-Known Member

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    the legal level in Vic is 75dBa ... and hence that statement I would think.

    dunno how NSW can be 90... a v8 Supercar makes 93!
    (according to the sound monitoring I have seen at PI circuit)
     
  4. monstar

    monstar Naturally as-pirated

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    Interesting, thanks for that. Because the deceleration fuel cut off setting that determines amount of fuel after cut-off is same on the e38 ECU 2014 6.0 vs 2015 6.2 is all. I understand the significance of how they jam together to create required aural stimulation, but DFCO is same as it ever was in our e38 as far as I can see.
     
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  5. cashie

    cashie Active Member

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    monstar likes this.
  6. cashie

    cashie Active Member

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    Yep, was an excellent read.
     
  7. monstar

    monstar Naturally as-pirated

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    Way Vic legislation reads is, given car manufacturer has undergone certification in line with the revisions of 1983 (83/00), ie a vehicle has a noise certification level, noise can not exceed that level by more than 5 dB.
    The difference in swapping OEM V8 exhaust components varies AFAIK from 82 dB for VE auto to 109 dB for VF R8.
    What I found is that it doesn’t matter where you procure the exhaust bits from, noise has to be no more than 5 dB over certified level.
    In other states there is no mystery because legislation is in accord with the Green Vehicle Guide which lists such minutiae.
     
  8. cashie

    cashie Active Member

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    Does anyone know exactly what the VF2 BiModal mufflers need to work?
    What exactly is the specs of the PWM signal they are expecting to cycle open and closed?
     
  9. cashie

    cashie Active Member

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