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The mkiv Supra Owners Club

wooooo'ing/resonance noise as 1st turbo spools?


hadyn

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I dont think its the `death whine` as I have Jspec ceramic turbos, and they tend to just detonate rather than whine. Plus its a different noise.

 

I`m not sure if the cold weather plays a part in it, I have never taken much notice, but am sure I had it in the summer as well.

 

I cant work it out. But it might be worth seeing if we have any similarities in our vehicle set ups, I have:

 

93 TT Auto

HKS (green mushroom) air filter

Standard J-spec turbos

Standard BOV

Standard I/C setup and hoses

Both cats still fitted

Stainless steel cat back system

 

????????

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I`m not sure if the cold weather plays a part in it, I have never taken much notice, but am sure I had it in the summer as well.

 

 

Please dont take this as patronising, but the turbos do make a hell of a racket when spooling, more so in cooler tempratures.

The open element wil make them even more so, you sure its not this

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I cant work it out. But it might be worth seeing if we have any similarities in our vehicle set ups

????????

 

I have a completely standard '93 j-spec. I use it as a daily driver and have had it since last summer. I started witnessing the same sound about 2 months ago (cold weather, car running for less than 10mins). Nowadays I drive like an old woman in a micra (i.e no boost whatsoever) until my car really warms up. I don't hear the sound very often anymore - hopefully everything is ok. My knowledge of these matters is very little so I'll get it looked at soon.

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Please dont take this as patronising, but the turbos do make a hell of a racket when spooling, more so in cooler tempratures.

The open element wil make them even more so, you sure its not this

 

Thanks, its not patronising at all (when it comes to the turbos im a dullard ;) )

 

But I have had my supra for nearly 5 years and its only really started happening in the last year. Equally, it does not seem to be getting any worse to when it first started? :blink:

 

As an example I drove from Reading to Norfolk on Sunday. Chilly, yes, but not freezing cold.

 

Lets say from standstill I pull away, the first turbo starts to come in and (not always) you get the 'wooooooing' for about a second or two, then as it continues to spool up it stops immediately?

 

It also happens at higher speeds, for example I can also be doing 60mph and if I accelerate to bring the turbos in..... same thing!

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  • 1 month later...

I have the same, but only on cold mornings, once she's hot it stops (even after I swapped over to technics hybrids still the same), I thought it might be some type of resonance in the intake until the car gets hot.

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Mine happens on spool up of the first turbo (sounds like your blowing across the top of a beer bottle).

 

The odd thing is that once it starts to make the noise you can hold the sound by not accelerating or de-celerating. But once you do either the noise stops immediately?

 

 

This is me exactly... definitely only when cold. I still think it's a resonant frequency in the airfilter, but i've been wrong before. Mine is usually around 2800-3000 revs, and if i keep the revs constant i can keep the woooooo'ing... like i said before though, i haven't noticed it in a while, but you get so used to the noises it might be there and i'm just blocking it out :)

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My bog standard 1993 j-spec has been doing this quite loudly for over two years now, mainly when going up hills or under moderate acceleration on the flat.

 

Will be fitting a new stock BOV in the next week or two so it might stop then. (I actually quite like the sound though).

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I disagree with the BOV verdict.

 

I notice this sound only when it is cold out. Usually after being parked up overnight. It stops when the engine is warm and all summer long!

 

If the BOV was at fault then it would be present all year, would it not.

 

I believe it is to do with a resonance within the intake system and/or heating.

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I remember searching about the same sound ages ago, and also found that it was called 'moosing' or 'wolfing'. It has been discussed before somewhere, if not here then on mkiv.com I did have the same problem when I first got the car, though it hasn't happened again since. It was also dismissed at the time as resonance.

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I've just read throught this entire post and summise that its induction related, have you all changed your airfilters recently?

 

Someone mentioned having a HKS mushroom filter, first off, get rid, they are shite, they disintergrate and end up flying into your turbo.

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  • 1 month later...

sorry to open this up again,

 

i also think its induction related,

 

I changed to an apexi induction kit, and its only happened since then, all the symptoms as described through the whole thread, i listened to the sound clip from mkiv.com, which does sound very similar, but it doesnt do it as loud, and doesnt do it on every gear change just now and then....i never even boost when the engine is cold, so its not when its cold....but defo when accelerating up through the first turbo...from maybe 40....thats my most common case!

 

Oh well....just have to live with it...better off sorting the annoying squeel from my brakes! :(

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