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Thread: wierd sounds of a gen 2 ported shroud GTX3071R

  1. #1
    ethanol sniffing Backyard Mechanic adamaw11's Avatar
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    Default wierd sounds of a gen 2 ported shroud GTX3071R

    I've just upgraded my turbo, was previously running a chinese copy 2871, never had a ballbearing turbo before.

    So now I have a Kinugawa Gen2 3071R, with ported shroud.

    So it squeals a lot when off boost, just light throttle, even coming off idle it can be heard, it doesn't sound like a vacuume leak, just this high pitch squeal that gradually increases with more throttle and revs. A squeal or whistle, whatever you'd call it, but it's fairly loud.

    Also, when turning the car off, it sounds like the turbo keeps spinning for quite a while, not just a smooth spinning sound, almost like a chugging sound, almost like the wheels of a skateboard or something, maybe this is just the normal sound for a larger ballbearing turbo?
    Maybe the ported antisurge shroud also affects how it sounds when it's spinning down?

    It is a brand new turbo, so maybe the bearings or something still needs to bed in?
    The turbo seems to do every thing right now the wastegate is not making it overboost, and spools up pretty nicely around 4k plus on the blacktop 20v.

    I'm just hoping all these wierd sounds are just normal for a modern aftermarket 3071, and not something wrong with the bearings.

    Can anyone comment on their own experiences with gen 2 ball bearing turbos?
    http://www.toymods.org.au/forums/showthread.php?t=83259
    '88 A.D.M aw11 '98 4age 20v blacktop
    NA: 14.745@150kmh at willowbank. On E85 with 6psi boost: 13.573@165kmh. ~8psi: 13.187 @169.9kmh. >10psi: 12.9 rod fragments @ 174mm holes in block
    daily: '93 ae101 Levin coupe. Motorbike: '09 Suzuki GSR600: 12.358@179kmh at Willowbank

  2. #2
    ethanol sniffing Backyard Mechanic adamaw11's Avatar
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    Default Re: wierd sounds of a gen 2 ported shroud GTX3071R

    Just to update this, the sounds are all still there just the same. I think I'll ignore the sounds and just enjoy what the turbo delivers, and let it idle for a while before turning it off, in case it helps.

    But to comment on how the 3071 is on the 20v, I'm really happy with it. No worries about it being too laggy or anything. At 3k rpm it still pulls harder than NA, and by 4k rpm there's some usable grunt there. Definitely a good choice of turbo for a 20v 4age, wouldn't say it's too big at all if you want power in the mid to high revs.
    http://www.toymods.org.au/forums/showthread.php?t=83259
    '88 A.D.M aw11 '98 4age 20v blacktop
    NA: 14.745@150kmh at willowbank. On E85 with 6psi boost: 13.573@165kmh. ~8psi: 13.187 @169.9kmh. >10psi: 12.9 rod fragments @ 174mm holes in block
    daily: '93 ae101 Levin coupe. Motorbike: '09 Suzuki GSR600: 12.358@179kmh at Willowbank

  3. #3
    Toymods Events Secretary Too Much Toyota trdee's Avatar
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    Default Re: wierd sounds of a gen 2 ported shroud GTX3071R

    I have a legit Garrett GTX3071R on my 9A, with the anti surge housing. It doesnt squeal off boost, but it does squeal if you go slowly ease off from full throttle to part throttle when the turbo is boosting hard, which I assume is air bypassing the anti surge housing to correct for the fact you just fucked the volumetric flow rate but it is still pumping high pressure (therefore pushing you toward the surge line)

    you can hear it pretty well here (watch exit of fish hook about 3:48)

    https://youtu.be/UKpwlyPD2jM?list=PL...C6-Kzn-z&t=226

    And yeah you can definitely hear it spooling down for a good 10-20 seconds after switching the car off. It sounds like roller skate bearings etc
    1988 AW11 9A-GTE - Turbo Missile | 2004 Elise K20A - N/A Screamer | 1984 MA61 1JZ-GTE - 80s cruiser
    Quote Originally Posted by Rex_Kelway View Post
    .....and the within first laps everything that made the AW11 great hit Rex as if the 'Gods of driving fun' had all Jizzed on his face.....
    Quote Originally Posted by JustenGT8 View Post
    Mono blocs mate....as close to yours as a Ferrari is to a Fiesta

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