I've had a K&N cone filter in my MY97 for a month or so. Everythings fine except when I decide to use the entire rev range I hear a very loud whining sound coming from the filter (I presume its that). It only lasts for about 400 revs then disappears.

I've gone over all the connections and nothing seems wrong with it.

Any ideas as to why it's doing this?

Matt

 

It'll probably be increased induction noise. If it doesn't sound too 'mechanical' I wouldn't worry but if it sounds really bad, get it checked out. I know that when I took the resonator box off my 93 WRX you get quite a lot of noise from the dump valve.

 

I get the increased air flow noise & dv noise, but this is an additional "WHOOOOMMPPPPP" noise at higher revs, say 4500 to 5000rpm.

It sounds like 100 people blowing over the top of a bottle if you get what I mean

Matt

 

It's is induction resonance where the velocity of the airflow sets up stahding waves - my HKS does it as well.

Trout

 

Cheers Trout, I'll try and get used to it then

Matt

 

Neanderthal - bell me and pop round if you are concerned, i run a Pipercross ind kit.

07974 356457

Paul

 

Cheers Paul.

I think it can wait till next Sunday though if you'd look at it then. Saves messing round with your Sunday.

Really looking forward to the tour & karting . Hope the weather's as good as todays!

Matt

 

I thought the my97 had an intermittent problem with the dv spring.....causing the 'blowing over a milk bottle top' sound?

If so, get it swapped.

Richard

 

I now remember reading something about that Dowser.

The spring or the whole dv swapped?

Matt

 

I'd guess the spring only, but maybe easier to swap the whole thing. On my99/00 they're easy to remove and inspect/clean/etc. - not sure on yours though?

Must be poeple with a spare OE one in their garage though

Richard

 

Just read the SIDC faq (couldn't open it at home yesterday - thanks NTL )

Under "common Faults" it has...
----------------------------------
Dump Valves
There seems to be a recognised problem with the 1997 specification car's dump valve. This does not shut properly under boost and thus vibrates giving the sound similar to someone blowing across the top of an open bottle. It has also been likened to a steam train whistle or ship fog horn in extreme circumstances!. Meanwhile the 1998 model seems to have a totally revamped and larger blow off system, but I have had reports that the problem sometimes still occurs.
----------------------------------

I feel a post to the wanted section coming on, either that or I could go and get a "chirper" dump to atmos dv and really pi$$ the girlfriend off

Matt

 

With regards to noise - how much noise increase will I experience with an ITG air filter? I know they apparently don't sound as good as the induction kits, but I'd rather have the safety of the panel filter. I'm hoping to hear a difference to the factory filter though.

Any comments?

Thanks.

 

Tony

Unless you remove the standard induction resonator as well, you'll notice no difference...whatsoever

Richard

 

Okay, are there any problems with removing this? Any negative effects?

Cheers.

 

Neanderthal,

You won't be able to hear it anymore with that backbox mate!!

Daz

 

Your not kidding Daz!
The car sounds sweet now. I'm sure the g/f will hate it though
I might take the induction kit off now cause I can barely hear it

I've never had so many people turn and look at the car as I went through town!

I even scared a dog as I went past the owner didn't look too pleased

Matt

 

Tony

Someone reported incorrect fueling when driving in the wet, due to MAF water contamination - but I've run 2 cars over 100'000km year-round with no problems (using knocklink), as I guess so have others.

Just make sure that all the splash guards get refitted correctly and you fit a non-paper aftermarket filter.

Richard

 

Tony,

I've got an ITG panel filter in my car as well and no resonator pipework either. However, upon examining the filter recently I dicovered loads of crap on the bottom of it that must have came into the airbox though the standard hole. I'm going to put the pipework back in as soon as I get the chance and hopefully this will stop this from happening again.

IMHO if you want the noise, go for an induction kit. If you want better filtration without noise then replace the standard paper item with the ITG. Until I investigate further I don't want to say whether or not you'd be better off with or without the resonator pipework.

 

Thanks for the advice guys. Realistically, would any gains in BHP be the same with or without the resonator pipework? What is the purpose of removing it - just for the noise?!?

Cheers.

 

If you put an induction kit on - do most people leave the resonator in place?

 

Couple of weeks back I went through two HUGE puddles (more like lakes) that washed up over the bonnet. Thought to myself glad I don't have an induction kit.
Not sure if it would have got wet or not, but I'm happier with just the ITG filter.

P.

 

Tony - try it for yourself I found it gave a much quicker throttle response.

Rikki - an induction kit replaces the OE airbox, so the resonator may well be in the wing....but not connected to anything! The exception is if you fit one of the cold air pipes, then you must remove the resonator to make room.

Richard

 

Richard

I realised that the resonator is in the wing because I have removed mine but I was wondering what the deal was if you put an induction kit on: whether most people take the resonator out aswell as the air box.

Regards
Rikki

 

Rikki.

Having not been told to remove the resonator in the fixing instructions for my induction kit (and following Chiarks guide) I left mine in the wing.

Matt

 

Tony I have an ITG panel and removed resonator.

Took about half an hour - bit fiddly but nothing too difficult. Can hear the dumpvalve a bit more now. Worth doing I think.

[Edited by Rikki 95WRX - 2/11/2002 10:48:19 PM]

 

Tony - AFAIK removing the resonator will make it louder - however I doubt that there are any gains over the standard pipework - and any small gains would not be noticeable. It might *feel* quicker 'cos it's noisier, but then again you have to put up with the risk that you'll get some crap in the airbox and this will start interfering with the airflow - as in my case

I like noise as much as the next guy (fully decatted system) but as I said earlier, I'm putting the pipework back in as soon as I get the chance.

You pay's your money - you take's your chance

[Edited by The_Gza - 2/13/2002 12:15:32 AM]