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Author Topic: APE SS BOV mod - how ?  (Read 8032 times)

Offline sandys

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Re: APE SS BOV mod - how ?
« Reply #30 on: July 06, 2012, 08:32:19 pm »
Diesels work in a similar fashion to this don't they and run higher boost yet still manage >100k no problem?
« Last Edit: July 06, 2012, 08:35:52 pm by sandys »

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    Offline JamesSS

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    Re: APE SS BOV mod - how ?
    « Reply #31 on: July 06, 2012, 09:58:54 pm »
    The majority run lower boost as far as I'm aware, probably no more than 10psi.

    Off-boost surge is caused by the throttle plate closing and trapping the boost. Without a dump valve it has nowhere to go but backwards through the turbo. Most diesels don't have throttle plates so I don't think this would be a problem... could be wrong though!

    Offline Gb190

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    Re: APE SS BOV mod - how ?
    « Reply #32 on: July 07, 2012, 07:04:15 am »
    Yea the apee also has a dump valve and dumps the majority of the air so don't worry it is not causing the engine or the turbo any damage at all. It's not stalling the turbo it's just the remaining air blowing back accRoss the turbo.  I think you need to be more worried about the start stop function. Turbos running down and running up and all that. !!!!
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    Offline brads91

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    Re: APE SS BOV mod - how ?
    « Reply #33 on: July 19, 2012, 05:13:11 pm »
    Could anyone post up some pictures of what the removed and replaced in the air box?
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    Offline M5/Abarth Russ

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    Re: APE SS BOV mod - how ?
    « Reply #34 on: July 19, 2012, 09:50:47 pm »
    Here are some pics taken by forum member Greg.
    Airbox with restrictor in place.

    Airbox with restrictor removed.

    The restrictor (it just slides out).


    The restrictor seems to dull the induction noise thats all. Its a completely pointless item. It worth starting and revving it whilst the filter is out as it sounds superb but dont be tempted to drive it :)
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    Offline brads91

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    Re: APE SS BOV mod - how ?
    « Reply #35 on: July 19, 2012, 10:29:42 pm »
    Brilliant cheers :thumb: does it make a big noise difference? And think I'll have to try that ;D
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    Offline M5/Abarth Russ

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    Re: APE SS BOV mod - how ?
    « Reply #36 on: July 19, 2012, 10:39:39 pm »
    Yes I think it does make a difference but its still nowhere near loud enough  :(
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    Offline Explicitmata

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    Re: APE SS BOV mod - how ?
    « Reply #37 on: August 22, 2014, 12:27:43 pm »
    I've also done this mod recently with Greg's help, Interesting results and definitely helpful knowledge and advice from Greg. Results are somewhat inconclusive with just this removable restrictive piece removed - but it does seem to be louder and there also appears to be slightly more throttle response, not sure if this is just placebo or not but what's everyone else's opinions?

    I know this is an old thread, but I'm sure people are still reading all of this to this day as I have just done! :whistle:

    Offline aaron14

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    Re: APE SS BOV mod - how ?
    « Reply #38 on: August 22, 2014, 07:59:40 pm »
    I've also done this mod recently with Greg's help, Interesting results and definitely helpful knowledge and advice from Greg. Results are somewhat inconclusive with just this removable restrictive piece removed - but it does seem to be louder and there also appears to be slightly more throttle response, not sure if this is just placebo or not but what's everyone else's opinions?

    I know this is an old thread, but I'm sure people are still reading all of this to this day as I have just done! :whistle:

    When fitting your bmc did you just completely take out that wee resistor?

    Offline Explicitmata

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    Re: APE SS BOV mod - how ?
    « Reply #39 on: August 22, 2014, 11:19:14 pm »
    I've also done this mod recently with Greg's help, Interesting results and definitely helpful knowledge and advice from Greg. Results are somewhat inconclusive with just this removable restrictive piece removed - but it does seem to be louder and there also appears to be slightly more throttle response, not sure if this is just placebo or not but what's everyone else's opinions?

    I know this is an old thread, but I'm sure people are still reading all of this to this day as I have just done! :whistle:

    When fitting your bmc did you just completely take out that wee resistor?

     :thumb: :wave: :whistle: BEWARE - small essay warning: :whistle: :wave: :thumb:

    Yeah, I removed the slide in trumpet entirely. It does nothing positive for the air flow at all, it only leaves less room in the bottom of the air box for air to gather before being forced up through the filter and sucked out into the turbo. As this trumpet is an extension to the external intake pipe, the space used up is actually bigger than just the surface area of the trumpet because it has air rushing through it. Either side of the trumpet is wasted space if you think about how the air is sucked through the bottom of the box, instantly being forced upwards through the filter, and not sideways into the available space either side of the trumpet, obviously meaning it's space which could otherwise be used productively for air flow to the engine as the entire volume of the box will be used instead of 'most' of the volume.

    I wasn't sure how it worked at first but after thinking logically about it I concluded (IMHO of course) that it's taking up around 4-6 cubic inches of air space (including the space behind the trumpet which is blocked of by it being there) thus reducing air flow somewhat and, in turn, deadening the sound quite dramatically. So after speaking with Greg (Gb190), and removing the slide in trumpet I have noticed it's slightly louder and I also feel there's slightly more throttle response, this could of course just be placebo affect though, but it would make sense considering the increase in air flow.

    I'll also be looking into removing the similar piece on the top of the air box (connected to the out-take for the turbo) as Greg (Gb190) has suggested as this does exactly the same as the bottom piece but worse still. As it doesn't allow the filter to have full effective airflow because of it's positioning (half way over the air filter), this will also deaden sound and reduce air flow. This is due to the air not having time and space to be pulled through the entire surface area of the filter, instead possibly only 3/5 or 2/3 of it.

    Thirdly, the intake pipe will either be removed completely (as it's stupidly positioned right behind the radiator and also has no cold air feed to it whatsoever from what I can tell as it is sat behind a piece of plastic with no air flow around it) or it may be replaced with a custom hose in a more suitable position for a sufficient cold/fresh air feed.

    It's got me thinking what other modifications could be made to the air box and it's surroundings for better air flow and production/release of sound - So I'll be sure to post it somewhere if I come up with anything or if I find out anything else from other people.

    Apologies for rambling on, but I hope people will agree with what I've discovered whilst thinking about how and why it increases sound and airflow, and also help anyone (like me) who has little understanding of things like this.

    Olly.  :wave: :angel:
    « Last Edit: August 22, 2014, 11:32:03 pm by Explicitmata »

     

    hungry