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  1. #1
    Customboy's Avatar
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    To jetex or not to jetex that is the question!

    Hi there all I got a bit of a head scratching moment and thought I would ask u gurus here to stop this itch lol, right I used to have fitted to my a3 turbo a smoothed and drilled airbox with a pipercross panel filter fitted, then I took the plunge and fitted a induction kit similar to the bmc cda ones but found that the car didn't boost anywhere as good as it used to I left it for a few days and see if it would change, but sadly the car never felt as strong as it was so right I thought off with the induction kit and back to the airbox! And low and behold the car ran better then ever boosting just over 1bar and pulled so well but I have seen everyone with jetex filters and was thinking are they any good? Or just stick with what I have? The car has following mods

    Rtech remap
    forge 007p dv
    3 inch downpipe and decat stainless steel exhaust system
    forge hoses

    Will be fitting my forge fmic soon and then will be fitting my new k03s turbo then up to rtech for a custom map so should I buy the large jetex cone filter or just leave things the way they are even with the mods coming up? Just don't want to spend good money and see no gains any advice would be great

    Thankx for reading

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  3. #2
    S3featesV9's Avatar
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    I love my Jetex filter! Love it that much I threw my old air box away as I knew I'd never want it back in place
    MODS - Custom Code phase 1, 007p DV, various powerflex bushes, EBC grooved and drilled - red stuff pads, N249 deletion. Badger5 V2 80mm TIP. Scorpion backbox + custom centre section, LCR front splitter, Jetex Fr-08001, R32 rear ARB, Forged IE rifle drilled rods, 20mm rear & 15mm front spacers.

    TO DO - Coilovers, adjustable tie arms, DP/mani/decat, FMIC and new remap


  4. #3
    Customboy's Avatar
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    Did it make a big difference over the airbox? And I guess u have a s3 Im only running a remapped 150bhp aum engine so will it help or should I just leave it, I'm planning on fitting a cold air feed pipe from the front bumper this week and have the pipe ready but still into minds wether to buy the massive 80mm filter or just stick with the good ol airbox!! I'm going mad lol
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    SUBARU IMPREZA WRX ESTATE SOON TO BE RUNNING 340 BHP
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  5. #4
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    i had the bmc cda and have gone back to my airbox but i defo will be getting the jetex after seeing the differenve it made on my mates a3. i'm sure i've seen your car a couple days ago

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    The AUM engine already has the ko3s as standard, just saying in case you was unaware.

  7. #6
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    Whereabouts are u smokiedee? Where did u spot me ? Also Craig I think I made a mistake about engine codes they always get me in a twist my car is a v reg 1999 150 bhp sport so not a aum but forgotten what it is lol
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    THE BLUE BEAST, TAKEN FROM ME, GONE BUT NOT FORGOTTEN
    RTECH STAGE 2 REMAP NOW RUNNING 223 BHP AND 253 FTLB OF TORQUE,
    SUBARU IMPREZA WRX ESTATE SOON TO BE RUNNING 340 BHP
    ANTI LAG/LAUNCH CONTROL/MAF LESS/ LOVE IT !!

  8. #7
    16Klappe's Avatar
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    Quote Originally Posted by Customboy View Post
    Whereabouts are u smokiedee? Where did u spot me ? Also Craig I think I made a mistake about engine codes they always get me in a twist my car is a v reg 1999 150 bhp sport so not a aum but forgotten what it is lol
    AGU, it's written on the top of the engine just to the right of the pulleys on a tab if you want to check.

    I have a Jetex and the only real difference is the noise, before I had a smoothed airbox with an upgraded filter. There is no power difference on the two, going by feel and datalogs.

    A smoothed airbox is more than ok for a stage two car.

    Jetex filters look better though...



    Last edited by 16Klappe; 13th February 2012 at 07:36.

  9. #8
    Customboy's Avatar
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    Thanks 16klappe that's a great help least I now know my engine haha and for the moment guess I will stick with my airbox cheers everyone
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  10. #9
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    I saw a rise in peak airflow readings of 10g/s after replacing my pipercross filter with the jetex and b5 tip, although not sure the filter alone will make much difference
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  11. #10
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    Carbonio?

    550 cc Injectors / Milltek Exhaust Manifold

    Forge Silicone / Goodridge Hoses / EBC A/R

    G60 SMF / Launch Control Map

    Powerflex Black A/R / H&R Anti-Roll Bars

    Carbon Wrapping / 104Db @5400 RPM

  12. #11
    "Stick a V8 in it!"

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    Its all hype imo.

    Theres no doubting the Badger5 Tip works on tuned S3's, but fancy air filters on standard engines? nah!

    On the B5, Audi used the same filter on every model from the base spec 1.6 to the 380hp RS4. If that filter can happily flow enough air to satisfy a 380hp motor, it can flow enough air to satisfy my 200hp 1.8T, and i know it'll do so without damaging my MAF and without risking crap getting into my engine due to poor filtration.

    I guess its possible that the A3 airbox is smaller or more restrictive than the B5 one, though looking at the photos there certainly isnt much in it...

    You've also got the issue of removing the velocity stack, and the effect that has on the MAF readings, though i'm sure most folk nailing on a cone filter wouldnt even think twice about that funny trumpet stuck on the front of the MAF in the standard installation... As a result of this, its entirely possible to see more g/sec after removing the stock airbox and fitting a cone, but not because you're flowing more air, instead because you've altered the airflow through the MAF enough to screw up its readings.

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  13. #12
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    Quote Originally Posted by Alais DJA View Post
    Carbonio?
    Personally speaking, not a fan for performance reasons as well as how stupidly over price they are.

    With the filter mounted in that position it halves the life of the filter, is open for all the road crap, salts, grit and water. They were cool 5 years ago, but tech has moved on. It does offer cooler temps, but because it is pre turbo it is of little if any effect.

    I used to run one, my girlfriends A3 (which is the same spec as yours but with PCV/N249 delete) and Prawn used to run one...In fact everybody I know who HAD a CAI now runs a MAF mounted filter in place of the air box. Good flow and much more sound

    The other option is having a bit of both and going for the Tuffty patented Conebox.




  14. #13
    RIP S3dave

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    FACTs are, Jetex cones with heatshield do flow more real air and make more power as measured on the dyno... over the stock airbox

    filter for filter its not wow gains, noise it is, but performance is raised a little even on stockers.. Add a TIP to k04's and the rest is well documented now...
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  15. #14
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    Badger could you please pm me info and cost for your tip to fit k26 turbo thanks

  16. #15
    "Stick a V8 in it!"

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    Bill, have you ever compared a tuned K04 with a B5 Tip/Jetex to a standard smoothed/opened up airbox with new paper filter and B5 Tip?

    Any figures i can view?

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  17. #16
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    Quote Originally Posted by badger5 View Post
    FACTs are, Jetex cones with heatshield do flow more real air and make more power as measured on the dyno... over the stock airbox

    filter for filter its not wow gains, noise it is, but performance is raised a little even on stockers.. Add a TIP to k04's and the rest is well documented now...
    I've always liked the quoted gains on airfilters....

    10 bhp from a K&N carburettor for MK2 golf was my favourite.

    It's again down to opinions against fact.

    Opinion is that the jetex works better as it "flows better", yet only really seen when put as a combination of mods on a dyno

    However, heat rises. So surely an air filter at a higher position and nearer the engine is sucking in warmer air that a air filter down a foot lower with no heat and a direct air feed.

    550 cc Injectors / Milltek Exhaust Manifold

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  18. #17
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    With a cone filter, is bigger better? I've thought of changing my cone for a jetex or a larger cone
    Word!!!

    My A3/Martys Golf would smash that, and this guys £7000 GT9743 supercharged love machine.

  19. #18
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    Ryan MTM I've made a custom 3" tip on my k26 MTM which I will be selling in a couple of months or if your interested in making one I've got pictures in my build thread

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  20. #19
    "Stick a V8 in it!"

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    Stacey: why you selling the K26? havent you just got it all sorted?!

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  21. #20
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    Yeah pretty much but runs to hot for my liking and when I bought the MTM kit plan was standard internals but now everything else is upgraded now looking at garrett in a k26 turbine housing which previously didn't know these hybrids existed

    Will be aiming to crack 400 Mark :whistle:
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  22. #21
    RIP S3dave

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    Quote Originally Posted by Alais DJA View Post
    I've always liked the quoted gains on airfilters....

    10 bhp from a K&N carburettor for MK2 golf was my favourite.

    It's again down to opinions against fact.

    Opinion is that the jetex works better as it "flows better", yet only really seen when put as a combination of mods on a dyno

    However, heat rises. So surely an air filter at a higher position and nearer the engine is sucking in warmer air that a air filter down a foot lower with no heat and a direct air feed.
    thats why you can buy a full kit which includes heatshield...
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  23. #22
    Alais DJA's Avatar
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    Quote Originally Posted by badger5 View Post
    thats why you can buy a full kit which includes heatshield...
    Tasty...

    What the damage on these?

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  24. #23
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    Ok so looking at getting a replacement turbo. Obviously it's got to be k04 but does it matter what engine it came from? Mines BAM.

    Or if anyone could help me out massively and actually point me at a turbo on eBay or something, would be great!
    MODS - Custom Code phase 1, 007p DV, various powerflex bushes, EBC grooved and drilled - red stuff pads, N249 deletion. Badger5 V2 80mm TIP. Scorpion backbox + custom centre section, LCR front splitter, Jetex Fr-08001, R32 rear ARB, Forged IE rifle drilled rods, 20mm rear & 15mm front spacers.

    TO DO - Coilovers, adjustable tie arms, DP/mani/decat, FMIC and new remap


  25. #24
    S3featesV9's Avatar
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    Sorry, posted in wrong thread haha.
    MODS - Custom Code phase 1, 007p DV, various powerflex bushes, EBC grooved and drilled - red stuff pads, N249 deletion. Badger5 V2 80mm TIP. Scorpion backbox + custom centre section, LCR front splitter, Jetex Fr-08001, R32 rear ARB, Forged IE rifle drilled rods, 20mm rear & 15mm front spacers.

    TO DO - Coilovers, adjustable tie arms, DP/mani/decat, FMIC and new remap


  26. #25
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    Badger that tip and filter looks great wish they could work with my car
    p

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    SUBARU IMPREZA WRX ESTATE SOON TO BE RUNNING 340 BHP
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  27. #26
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    Quote Originally Posted by Alais DJA View Post
    Tasty...

    What the damage on these?
    I think they are over £200(?) Plus an S3 or a K04 conversion on your A3...


  28. #27
    RIP S3dave

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    Quote Originally Posted by aragorn View Post
    Bill, have you ever compared a tuned K04 with a B5 Tip/Jetex to a standard smoothed/opened up airbox with new paper filter and B5 Tip?

    Any figures i can view?
    yes..
    gains were seen...

    I dont remember the cars reg to look it up tho. think it was an s3 tho
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  29. #28
    RIP S3dave

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    Quote Originally Posted by Alais DJA View Post
    Tasty...

    What the damage on these?
    £219+vat

    K04 cars only for 80mm TIP reminder
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  30. #29
    RIP S3dave

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    Quote Originally Posted by S3featesV9 View Post
    Ok so looking at getting a replacement turbo. Obviously it's got to be k04 but does it matter what engine it came from? Mines BAM.

    Or if anyone could help me out massively and actually point me at a turbo on eBay or something, would be great!

    K04-023 with egt sensor for your bam
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  31. #30
    Reesy's Avatar
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    Quote Originally Posted by badger5 View Post
    yes..
    gains were seen...

    I dont remember the cars reg to look it up tho. think it was an s3 tho
    I think westy went from a smoothed airbox to a jetex and I'm pretty sure the number he said was 7bhp.


  32. #31
    Westy's Avatar
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    Quote Originally Posted by badger5 View Post
    yes..
    gains were seen...

    I dont remember the cars reg to look it up tho. think it was an s3 tho
    It was mine Bill. I turned up with B5 TIP but smooted airbox fitted. We did a run, fitted Jetex then run again and saw 7bhp.

    Car reg would either be OE51HYB or S111NPW and would have been from July 2011.
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  33. #32
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    Quote Originally Posted by Customboy View Post
    then I took the plunge and fitted a induction kit similar to the bmc cda ones but found that the car didn't boost anywhere as good
    So.... what I read from this is that you bought and fitted a cheap induction kit off of ebay - Something along the lines of this: PERFORMANCE UNIVERSAL SPORTS CARBON FIBRE AIR FILTER COLD FEED INDUCTION KIT | eBay - and it didn't go as well.

    The reason is that inside those enclosed things, there is a filter exactly the same size and flow capacity as a gnat's arse. They are no good for a 1.8T engine, as they need to be able to breath easily.

    The reason that it didn't go as well post fitting is because the engine and turbo were having to fight harder for every cf/m of air coming in.

    Buy a big, free flowing filter. Jetex is ideal.
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  34. #33
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    Thank welly for the advice but it was a Simota induction kit not ur cheap nasty eBay jobs but the car just didn't like it but now reading all these posts about jetex has got me wanting one oh decision decisions but I'm very happy with airbox and soon will be running a cold air Feed to it from lower front bumper just with all the other mods I have coming up would it be worth investing in one of these jetex cones
    p

    THE BLUE BEAST, TAKEN FROM ME, GONE BUT NOT FORGOTTEN
    RTECH STAGE 2 REMAP NOW RUNNING 223 BHP AND 253 FTLB OF TORQUE,
    SUBARU IMPREZA WRX ESTATE SOON TO BE RUNNING 340 BHP
    ANTI LAG/LAUNCH CONTROL/MAF LESS/ LOVE IT !!

  35. #34
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    Quote Originally Posted by Customboy View Post
    Thank welly for the advice but it was a Simota induction kit not ur cheap nasty eBay jobs but the car just didn't like it but now reading all these posts about jetex has got me wanting one oh decision decisions but I'm very happy with airbox and soon will be running a cold air Feed to it from lower front bumper just with all the other mods I have coming up would it be worth investing in one of these jetex cones
    I asked Bill if we could do the comparison runs on his rollers because I too was sceptical as to how much more a large cone would flow over the standard airbox (mine was also smoothed and had cold feed). We were both amazed at how much flow and power a Jetex gives over the box.
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  36. #35
    "Stick a V8 in it!"

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    Quote Originally Posted by Westy View Post
    It was mine Bill. I turned up with B5 TIP but smooted airbox fitted. We did a run, fitted Jetex then run again and saw 7bhp.

    Car reg would either be OE51HYB or S111NPW and would have been from July 2011.
    Standard paper filter in the airbox? New or old?

    I'm just trying to get a comparison on a fair playing field. Replacing a 20k old paper filter with a jetex and gaining some power doesnt prove that much, as i'm sure you'll agree!

    Personally i feel that OEM's use paper filters on their engines, irrespective of performance level, because its the only thing that actually filters the air properly. Aftermarket filters have a hugely reduced surface area, which means even to match the flow of a standard paper filter they need much larger holes due to this reduced area. To offer less restriction they need even bigger holes still. These huge holes simply dont filter the air properly, and most filter manufacturers then resort to soaking the elements in oil to try and capture more dirt.

    So for the sake of a 5hp gain (which on a 260hp S3 engine is less than 2%, and ofcourse trying to measure such small differences with any accuracy on a chassis dyno is difficult at best) your risking MAF damage and letting your engine breathe badly filtered air.

    I'll be sticking with my paper filter!

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  37. #36
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    Quote Originally Posted by Customboy View Post
    Thank welly for the advice but it was a Simota induction kit not ur cheap nasty eBay jobs but the car just didn't like it but now reading all these posts about jetex has got me wanting one oh decision decisions but I'm very happy with airbox and soon will be running a cold air Feed to it from lower front bumper just with all the other mods I have coming up would it be worth investing in one of these jetex cones
    Sweet, thats probably your best bet. All these enclosed induction kits seem to have a tiny filter inside annoyingly, even the BMC ones aren't very big.
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  38. #37
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    Quote Originally Posted by aragorn View Post
    Standard paper filter in the airbox? New or old?

    I'm just trying to get a comparison on a fair playing field. Replacing a 20k old paper filter with a jetex and gaining some power doesnt prove that much, as i'm sure you'll agree!

    Personally i feel that OEM's use paper filters on their engines, irrespective of performance level, because its the only thing that actually filters the air properly. Aftermarket filters have a hugely reduced surface area, which means even to match the flow of a standard paper filter they need much larger holes due to this reduced area. To offer less restriction they need even bigger holes still. These huge holes simply dont filter the air properly, and most filter manufacturers then resort to soaking the elements in oil to try and capture more dirt.

    So for the sake of a 5hp gain (which on a 260hp S3 engine is less than 2%, and ofcourse trying to measure such small differences with any accuracy on a chassis dyno is difficult at best) your risking MAF damage and letting your engine breathe badly filtered air.

    I'll be sticking with my paper filter!
    It was with a brand new paper filter as I'd had a service in June. It came fitted with a green cotton panel when I bought the car but I went back to paper on it's first service I had for it. I had also replaced the MAF with a brand new genuine one.

    I've found the post in my thread with the graphs but can find any of the comparison runs so hopefully Bill has something:

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  39. #38
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    Quote Originally Posted by Customboy View Post
    Whereabouts are u smokiedee? Where did u spot me ? Also Craig I think I made a mistake about engine codes they always get me in a twist my car is a v reg 1999 150 bhp sport so not a aum but forgotten what it is lol
    Then as already said its the AGU engine, which only has a ko3 so a ko3s would be an upgrade

  40. #39
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    Quote Originally Posted by Craig1.8t View Post
    Then as already said its the AGU engine, which only has a ko3 so a ko3s would be an upgrade
    KO3 Hybrid. Speak to "beachbuggy"

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  41. #40
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    Quote Originally Posted by aragorn View Post
    I'll be sticking with my paper filter!
    good for you. If that makes you happy.

    The fact remains, as stated... The open Cone large Jetex did flow more and make more power, which is the goal for folks tuning their cars...

    The lightly coated cotton gauze filters do filter... foams ones I am not a fan of, as on numerous occasions I have seen and felt the gritty dusty oily debris on maf's where dust had migrated thru them. Its a filter, and not fit and forget tho, so is subject to cleaning/replacing when required.

    Changing paper filter in OE airbox for Green filter resulted in zero gains when I ran that test. I no longer sell panel filters unless asked to supply one specifically.
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