mj0n3s

iTrader: (1)

after the bottom end going because of a faulty maf sensor and due to the price of the dam things i need some info on the best air filter/induction kit to use which wont cause maf damage. I currently have a hks mushroom which ive heard is one of the worst. dont really wanna go back to the standard airbox because it means loosing my front mount Im only after around 300 so probaly dont need the front mount but it looks sooo nice behind my 22b bumper lol. cars A a v3 sti type r

Cheers
Mike

baz995

iTrader: (8)

I have this one fitted mate

SPT Air Intake For WRX & STi

Its a great kit and pulling the data from the maping session the Duncan did the inlet temps measured were 19 degrees and then 22 degrees after a good run, i do not know what it should be normally but have had no problems whatsoever. Got mine 2nd hand for £70

perfect fit as its made by Subaru Performance and looks the part

hope this helps

jperkie

hi mike, i put one on mine and was also warned about maf damage but was told "if you really must then get an apexi dual filtered cone" as according to lots of tests the apexi came out top!!! and so i did and to honest it seems fine and looks very good and strong aswell, they also supply the mount brackets to hold the intake pipe and maf housing dead still which comes with the filter ,hope this helps.jamie

mj0n3s

iTrader: (1)

Thanks jamie. any idea who sells these.
also is there any other factor which will make a maf sensor fail ie vta dump valve

baz995

iTrader: (8)

i had the apexi on my MR2 Turbo, its a great filter, bought it after reading this

http://www.mkiv.com/techarticles/filters_test/2/

think it was £100 from MTTE

baz995

iTrader: (8)

sorry it was from here i bought it, seems they have put the price up over the years lol

Envy Performance & Styling Ltd: Power Intake

mj0n3s

iTrader: (1)

Cheers baz. Its amazing companys like hks and blitz are considered some of the best in the business and they come out with products which acording to that test are sh1te

baz995

iTrader: (8)

lol i know, no probs for the help, i spent ages looking into as i couldnt work out why HKS etc were so expensive, which ever on you go for i would recommend the SPT heatshield, again made by Subaru so perfect fit and uses existing holes/bolts

good luck

jperkie

mike, i bought my filter from a place near bath called temple tunning parts no is 01761 453393 very good service and product they are mail order though which can be done over the phone quite easily i paid £125.00 well worth it. jamie

shaggydabbydoo

Do you need a MAF mate got one coming off mine nothing wrong with it just had an engine rebuild and has been replaced?

mj0n3s

iTrader: (1)

Nah bought a new one mate, cheers anyways

Mrchips

iTrader: (7)

Go standard air box with panel filter. No issues then

mj0n3s

iTrader: (1)

i could do that, would be the safest option. i would then need to refit the standard sti top mount but im not sure if its up to heavy track use??

Mrchips

iTrader: (7)

Didn't realise you were doing track. Its a tough one, as you don't want one which has oil on it as that can **** up the MAF, what about going maffless. Simtek ECU, depends on what you wanna spend. The options are endless. Maybe speak with Simon, JGM, as he might be able to point you in the right direction with a better/stronger MAF.

mj0n3s

iTrader: (1)

would love to go maffless but as i have to fork out for a engine rebuild moneys a bit tight at the mo lol

Mrchips

iTrader: (7)

Oh ok. Good old maf's ay.?

I had an engine rebuild, not a cheap ordeal. I was mugged off with mine i think

53

iTrader: (41)

Don't muck about, fit the best !

Roger Clark Motorsport - RCM Product Detail

I run mafless but the above would be perfect for you. Check the dimensions.

mj0n3s

iTrader: (1)

so the rcm filter wont cause maf damage then?

joz8968

iTrader: (13)

It think you got unlucky with your last MAF - the MY93-98 ones are normally very robust and rarely fail.

The large K&N filters aren't heavily oiled and shouldn't screw the MAF, anyway. Plus they're amongst the best available...

I'll be fitting the same one plus the tuned 160mm ally trumpet - as in WRX53's pic. It'll be fitted to a Z32 MAF, which is all but the same as the MY97/98 OEM one that your car uses.

mj0n3s

iTrader: (1)

so is it the oil in the filter that causes the maf to fail?

joz8968

iTrader: (13)

Heavily-oiled type filters (are there actually any that are like this, these days?!) allegedly can bugger it up.

Although if you go to K&N's website, you'll see an article on extensive MAF/air filter oil contamination testing - and it proved a big negative!

Make of that what you will....

Splitpin

It is one of the factors that can lead to airflow meter degredation or failure, yes, however it is not the only one.

Oil or "mucus" can be sucked off the filter medium and coat/burn off on the sensor, so that's one way. However, the increased vibration the sensor often encounters as a result of being fitted into an induction kit can cause problems.

Also, with any induction kit, you have to account for the fact that the accuracy of the airflow measurement can be altered. This isn't the sensor being "broken" as such, it's simply a result of the way the flow of the air is altered by being preceded by a cone, rather than the standard panel filter and airbox around which the sensor and ECU are calibrated.

This calibration can be changed via an airflow computer or reprogramming the ECU - neither of which it sounds like you've got.

Your car raises a couple of major warning flags in that you have fitted a front mount intercooler and an induction kit and haven't had the car remapped around them. Even under circumstances where the airflow sensor wasn't damaged, the FMIC and cone filter alone may have put the engine into a position where it was going to go sooner or later - the failing AFM may simply have hastened its demise.


K&N aren't saying that MAF sensors can't be damaged by contamination from an oiled filter. They're simply saying that their own oiled filters don't cause MAF contamination, and they have a point.

As you say, heavily oiled filters can knacker airflow sensors. K&N filters aren't heavily oiled. QED.

joz8968

iTrader: (13)

Yes, I didn't make that (important) distinction - K&N ones seem to be MAF-friendly, due to being "lightly" oiled (to name but one brand, at least).

(Lazy "journalism" on my part lol )