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Author Topic: APE SS BOV mod - how ?  (Read 8008 times)

Offline Gb190

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Re: APE SS BOV mod - how ?
« Reply #15 on: July 04, 2012, 07:16:16 am »
Hi russ, did you get pics ???
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    Offline M5/Abarth Russ

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    Re: APE SS BOV mod - how ?
    « Reply #16 on: July 04, 2012, 12:13:16 pm »
    Yes mate I looked at them yesterday. Gonna have a play soon !
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    Offline M5/Abarth Russ

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    Re: APE SS BOV mod - how ?
    « Reply #17 on: July 05, 2012, 12:10:21 am »
    Right I had a little look. The trumpet seems to be some restricter and or silencer and removing it does indeed make things louder and dare I say it a little more reponsive.

    I also tested it with the air filter removed (just reving not driving it) and my god, what a superb noise. Whooshing with an epic turbo chatter.
    I think an induction kit would make a suberb mod.

    Also the engine cover just pulls off for easy cleaning. Start at the back and work forward.
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    Offline garyskisplym

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    Re: APE SS BOV mod - how ?
    « Reply #18 on: July 05, 2012, 11:03:06 am »
    Right I had a little look. The trumpet seems to be some restricter and or silencer and removing it does indeed make things louder and dare I say it a little more reponsive.

    I also tested it with the air filter removed (just reving not driving it) and my god, what a superb noise. Whooshing with an epic turbo chatter.
    I think an induction kit would make a suberb mod.

    Also the engine cover just pulls off for easy cleaning. Start at the back and work forward.

    I cant agree more removed mine to clean crap out the air box once and did it
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    Offline Gb190

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    Re: APE SS BOV mod - how ?
    « Reply #19 on: July 05, 2012, 06:52:13 pm »
    It is a lovely little mod. I would still put a small pipe in place of it facing down because when it get heated under ther I imagine it would be quite warm air but then I suppose the intercooler shoul take care of that. Window down in a tunnel and enjoy. ;-)
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    Offline JamesSS

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    Re: APE SS BOV mod - how ?
    « Reply #20 on: July 06, 2012, 12:11:45 am »
    Probably has been discussed before... But why are you guys after turbo chatter? :-\

    Offline sandys

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    Re: APE SS BOV mod - how ?
    « Reply #21 on: July 06, 2012, 09:47:08 am »
    The chatter is a characteristic of the engine from partial loads, does it from factory, you are not making it do something it doesn’t do already, some people like the sound, its reminiscent of WRC rally cars, changing the induction allows you to hear these engine noises better, brings out the extra whilstling and flutter which adds a bit more character.

    The BOV mod is to get an additional sound the Pssht from the dump valve also that some like.

    Offline M5/Abarth Russ

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    Re: APE SS BOV mod - how ?
    « Reply #22 on: July 06, 2012, 11:33:29 am »
    +1.

    The sound is just superb and the only reaon its stifled is to meet euro 5 standards. It should be heard as it really helps make the character of the car.
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    Offline JamesSS

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    Re: APE SS BOV mod - how ?
    « Reply #23 on: July 06, 2012, 12:14:04 pm »
    The chatter is a characteristic of the engine from partial loads, does it from factory, you are not making it do something it doesn’t do already, some people like the sound, its reminiscent of WRC rally cars, changing the induction allows you to hear these engine noises better, brings out the extra whilstling and flutter which adds a bit more character.

    The BOV mod is to get an additional sound the Pssht from the dump valve also that some like.

    We might be on about different things. I originally thought that people were on about the chatter sound when coming off the throttle/changing gear... Like this. If this happens from factory I'd be concerned lol. :-\

    If you get it under partial throttle, I assume that's wastegate flutter from when you're nearing the boost threshold.

    Offline sandys

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    Re: APE SS BOV mod - how ?
    « Reply #24 on: July 06, 2012, 12:19:48 pm »
    The chatter is a characteristic of the engine from partial loads, does it from factory, you are not making it do something it doesn’t do already, some people like the sound, its reminiscent of WRC rally cars, changing the induction allows you to hear these engine noises better, brings out the extra whilstling and flutter which adds a bit more character.

    The BOV mod is to get an additional sound the Pssht from the dump valve also that some like.

    We might be on about different things. I originally thought that people were on about the chatter sound when coming off the throttle/changing gear... Like this. If this happens from factory I'd be concerned lol. :-\

    If you get it under partial throttle, I assume that's wastegate flutter from when you're nearing the boost threshold.

    There are two things mentioned in this thread, it was originally about BOV mod and changed a bit to the wastegate flutter as shown in the link you post, this is a characteristic of the engine and happens on all the Multiair units, very hard to hear stock, they all seem to do it.

    I would assume having a similar turbo setup your AGP SS might do it, or does it have different boost control?
    « Last Edit: July 06, 2012, 12:24:05 pm by sandys »

    Offline Gb190

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    Re: APE SS BOV mod - how ?
    « Reply #25 on: July 06, 2012, 01:09:37 pm »
    The noise is in fact the air compressed by the turbo passing back through the compressor wheel of the turbo after the airflow is abruptly halted by the throttle plate closing. With having no throttle plate the hyd system of te multi air will shut down and cause it also the boost control solenoi will shut down to adding to the noise
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    Offline M5/Abarth Russ

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    Re: APE SS BOV mod - how ?
    « Reply #26 on: July 06, 2012, 03:02:04 pm »
    The chatter is a characteristic of the engine from partial loads, does it from factory, you are not making it do something it doesn’t do already, some people like the sound, its reminiscent of WRC rally cars, changing the induction allows you to hear these engine noises better, brings out the extra whilstling and flutter which adds a bit more character.

    The BOV mod is to get an additional sound the Pssht from the dump valve also that some like.

    We might be on about different things. I originally thought that people were on about the chatter sound when coming off the throttle/changing gear... Like this. If this happens from factory I'd be concerned lol. :-\

    If you get it under partial throttle, I assume that's wastegate flutter from when you're nearing the boost threshold.

    Yep that the noise - a great sound that should be heard all the time :)
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    Offline JamesSS

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    Re: APE SS BOV mod - how ?
    « Reply #27 on: July 06, 2012, 06:34:18 pm »
    I would assume having a similar turbo setup your AGP SS might do it, or does it have different boost control?

    Nope, don't get it on the AGP. Not too sure on the boost control; are the dump valves different on the AGP/Evo? If so, I'd hazard a guess that the spring in the Evo DV hasn't been setup with the correct preload.

    Yep that the noise - a great sound that should be heard all the time :)

    Don't think it would do your turbo a lot of good. It's just compressor surge as GB said. Pressurised air that can't escape out the DV and has to force it's way back through the turbo whilst it's still spinning. The higher boost you run the more damage it will do to the turbo... It's not going to ruin it in a month, but, it's still not worth putting the stress on the turbo for a bit of noise.

    Wastegate flutter vs turbo chatter (compressor surge)

    Offline M5/Abarth Russ

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    Re: APE SS BOV mod - how ?
    « Reply #28 on: July 06, 2012, 07:23:20 pm »
    Why would it damage your engine ? - the noise is there out of the factory. Its just stifled by the airbox and filter.
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    Offline JamesSS

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    Re: APE SS BOV mod - how ?
    « Reply #29 on: July 06, 2012, 08:17:30 pm »
    Why would it damage your engine ? - the noise is there out of the factory. Its just stifled by the airbox and filter.

    Correct and correct, but that doesn't mean it's good by any means (have a chat with an Abarth tech, see if they've got some answers, would be an interesting convo!).

    It doesn't damage the engine, it just puts extra stress on your turbo bearings, causing them to wear out faster. Some people say the wear is too small to notice, whilst others think it significantly reduces the life expectancy of a turbo; I can't tell you which is correct, but considering the cost of a turbo, I wouldn't chance it for a cool noise. ;D