GaryC

What air filters fit on MY99 (uk). Already got PPP but prodrive no longer fit air filter as say it has caused problems???

Any experiance of improvements?

sunilp

Gary

Get the ITG one from Scoobysport!

Lee

Gary,

I've been following the induction possibilities for the MY99...my findings from various posts..

the ITG filter (scoobysport recommended)is an oiled filter, similar to the Ramair , except the Ramair is over-oiled a bit which has made worse the problem that some have noticed oil being drawn into the system, most noticeably affecting the Mass Air Flow sensor which is immediately after the airbox.
Prodrive no longer fit the ramair cos of this.

Also, people fitting induction kits on MY99s have reported problems with the MAF sensor.

It would seem that the MY99 MAF sensor is of a different design to earlier models and is perhaps a wee bit fragile.

I would go for the ITG but to wipe off any surplus oil and maybe check it once a week.

The other common filter/induction kit is the K&N. As this is paper based it starts off as efficient as others but can clog easily.

Stef

Lee.

My K&N induction kit isn't paper based. It's cotton or something.

Stef.

Lee

oops ! cotton gauze is it ? still clogs quicker !

cotton, paper its all the same thing really

Doug

Whats symptoms do you get if you have a problem with the MAF sensor?

I fitted a Ram Air filter on Saturday, all seemed fine until today, very hesitant at low speeds but fine at high speeds.

Any advice?

ikinder

I'm currently running a developement RamAir filter. The main differences are mesh across the top of the filter to prevent deforming under suction and a different (thicker) filter oil (polymer). I'll report shortly to the BBS & IWOC on my findings. It's been on my car for nearly 1 month/1000 miles. No problems so far.

If you are concerned about the warranty issue. You can allways clean out the goo and put in the standard paper one.

Regards,

Ian M K
p.s. I'm not connected to Ramair. I just wrote in to ramair to report on the problems people seemed to have with the original (supplied via a Subaru dealer) ramair filter.

David Blows

Doug has asked the right question - what are the symptoms if there's something wrong with the MAF sensor?

FYI, I've fitted a GGR induction kit to my MY99. Ridiculously expensive, but it's made a VERY noticeable difference in acceleration, especially those all-important 2nd and 3rd gears for overtaking. Fuel economy is better, too.

sonu

I had a K&N filter panel fitted on Saturday for my UK '99, along with a Magnex backbox. Low end torgue has increased nicley. Now I can shoot off from light stops without waiting for the turbo to kick in .

firefox

Howdy...

If the MAF is shagged you will notice the engine running poorly (wrong A/F ratio)... wont idle very well.... not as responsive...

Might not be as apparent at the top end or on WOT.....

MY99 are more sensitive (metal film design)

I dont think the MY00 have a maf ?

J.

Doug

Would a dealer replace the MAF sensor under warranty if I have fitted a Ram Air?

I did buy it from them after all.

Lee

DavidBlows,

how much was the GGR kit ?

let me know how you get on with it cos MY99's are ending up with knackered MAF's after fitting induction kits...(not wanting to scaremonger!)

I fancy the Blitz kit for £150 but am put off by the tales of knackered sensors.

Doug

Phoned the dealer and told him about the hesitation at low speeds, I was told that the Ram Air shouldn’t be fitted to a MY99 because you’re virtually guaranteed to have problems.

I suggested that he told the parts dept. that recommended the filter in the first place. He said you can’t expect the people in parts to know information like that and any damage to the MAF sensor would not be covered by the warranty.

I checked the filter and found a large puddle at the bottom of the housing and residue every where else. Cleaned the housing and replaced the original filter and the transformation is amazing smooth running and instant pick up.

I think I’ll leave it until I have a Scoobysport exhaust fitted and let Pete recommend one.

David Blows

Lee,

My hearing must have been clogged when GGR told me the price. I thought he said £67 - but when i got the invoice it had become £167 (plus VAT!).

I've been extremely worried a) about spending so much; b) the effect on the sensor.

But now it's on...! No complaints. The amount still hurts, bit it's almost worth it...

I did check back with GGR and this is their official reply:

"We have experienced no problems with our own induction kit which utilities a
K&N bespoke filter. We have experienced problems with foam filters the oil
that they are usually treated with contaminating the HOT WIRE."

(I think he meant "utilises". Ho, hum).

It's not been on that long, so it's an anxious time right now. I'll keep everyone up to speed (ha!) on how it works out.

And PLEASE everyone - no replies about being ripped off, more money than sense, etc. The first may be true...

firefox

Evenin chaps...

A couple of things...

Lee... It wasnt the Blitz induction kits that caused the problems... It was the HKS ones... I havent heard of any problems with the Blitz... *was incorrect before*

On a similar note... I dont know of any common reported faults with the hotwire MAF (prior 99 models). So in theory GGR is correct in the mail... The problems have been with the 99 MAF (which uses hot film). I believe the MY00 car doesnt even have a maf ? (uses map)

Ask GGR about problems with Hot film ... hopefully you will get the same reply... but so what if they say there isnt and there is... how will you prove it ?

The Ramiar filter was an approved part for the 97 (maybe 98 cars), because it was supplied by the dealer (and used in the Prodrive performance pack). Fitting a RamAir to a 99 will invalid the warranty (along with other makes of filter - IMHO)

But it does depend on the dealer...

As said before...be cunning..if your MAF knackers... fit the original filter back.. but make sure it looks used.... look abit obvious fitting a new filter in a 16K mile car)

J.

Craig H

Question for firefox.
You've got a blitz fitted haven't you?
Where did you put the air temp sensor?

Cheers

Craig

firefox

Howdy...

You mean the air density sensor...

Its still in the same place... What MY are you referring too ?

Fitting the blitz just removes the box...not any ducting... It simply bolts unto the MAF...albeit a few degrees around...

J.

David Blows

Stef,

It's interesting that you got a K&N kit. I ended up with GGR (ouch!) because I was told - by several sources, including Demon T and Larkspeed who are main suppliers of K&N - that K&N don't do an induction kit for the MY99.

GGR supported that view when I challenged them on the price (after the event, of course - but at least they did offer to give me a full refund provided I hadn't fitted it...). A chap called Wayne categorically stated that K&N don't do an induction kit for MY99 and that their kit is totally bespoke, right down to the... wait for it... K&N filter.

Make of that what you will. The car is still *miles* better all round. I just hope the sensor holds out...

Stef

Lee.
I looked into all the available kits, and decided on K&N's own 57i kit as it is virtually identical to GGR's one, but £100 less (ooops, sorry David! ).
My kit gave me an 8bhp increase. This is what GGR claim for theirs.
I can only compare my kit with what I've seen of GGR's 'bespoke' K&N kit, but I couln't believe a firm would make something better for somebody else. Maybe it's just me!

See ya.

Stef.

[This message has been edited by Stephan (edited 06-10-1999).]

Stef

David.
I've actually got an MY98, so would it be different for a 99?
I'd have thought they were the same.

Stef.

PS They also told me that the cone was bespoke, but couldn't give me any reason why it would be better than K&N's own one!!!

Bob Rawle

As Firefox says ...

Problems were with HKS not Blitz. They were more to do with vibration caused by incorrect bracing/bracketry I think. A hot film is always going to be more fragile than a hot wire but a hot wire more susceptable to contamination.

A search of the BBS will reveal a detailed post which Quattro may have contributed to significantly I think.

pilch

Gents,

What filter kit would you recommend for my MY94 WRX import? K&N don't seem to make one (no surprises there then) and its impossible to get help from suppliers for WRX's.

Direct replies welcome.

Craig H

J,
Its a V5 STi. There was a sensor which plugged into the airbox itself. Air temp?

firefox

Howdy...

Its an air temp (desnity) sensor...same sort of thing...

On the previous versions it was mounted in the plastic ducting that connected between the front member (top of the head lights) to the wing... Its where the air is collected.

I would have thought that the Induction kit (if it was designed for the V5) should have a bracket for it. The sensor just needs mounting in front (next to) the filter.... Its not a very sensitive sensor... but best still to mount it next to the filter... get a bracker made up..

J.

Craig H

Or the tight **** version - a tie wrap!
As long as it won't do any harm.

firefox

Haha...

You COWBOY!!!

You will need it during winter.... just make sure its in the flow of the air...and not pressed against anything (false reading)

J.

Jude

I've had driveability problems with my 2.2L impreza several times in heavy rain when the custom air intake ingests some water. Turns out that the wire on the MAF sensor had been fouled. I was able to restore full performance by gently cleaning the wire with a cotton swap and isopropyl alcohol. I have since modified and improved the intake so it stays dry.

Bob Rawle

Its called the "Inlet Air Temperature Sensor" and compensates for fluctuating ambient air ie Winter/Summer. In a Bosch system this would be built into the MAF with a second sensor fitted at the throttle body to adjust for "Turbo Air Temperature"

Bob

Craig H

Bob,
But will it do any harm hanging about in front of the filter?

Cheers


Craig

Craig H

J
So if I just make a bracket from the flange at the base of the filter to be positioned in front of the filter. Is it worth protecting it with anything?

Cheers pardner!