Rob Day

iTrader: (78)

Tim(e), you need to take the hint here from Splitpin, Alan and many others regarding the 'seriousness' of what it is you are messing with.

Its like the theory that aftermarket dump valves offer extra bhp and quicker spool (particulaly the cheap ones), when in actual fact they **** up the smooth running of the engine.

Revert back to the standard induction with something like a green cotton panel filter and ensure that all the clips are fasterned down correctly. As mentioned above the last thread will be "Engine build" or "Car breaking". Its really not worth messing with something of so little importance. Spend your money and on gear that can actually offer more power or better handling etc.

If I had a standard 2004 STI and money was tight I would replace the panel filter with a green cotton, decat, possbly Walbro pump and remap. All can be done for well under a grand, which would see you smiling for a long time.

Rob

Tim(e)

I have the Walbro 255 and an HKS panel fitted plus straight through exhaust...

Removing the resonator box will not **** the engine...many have done it. Has anyone reported a ruined engine because of it on here?

All Im doing is slightly altering the air flow to the panel filter. The MAF records airflow after the panel filter so I seriously doubt that any more or less turbulent air is going to be recorded by the MAF as whatever flow or route the air takes or however long it takes the air to get to the panel filter will be neither here nor there as once the air hits the panel filter the same effect happens. Like if you run at a brick wall from different angles you still get stopped dead in your tracks.

If you are all saying how minor changes can have big knock on effects to the MAF then surely its a contradiction, as changing to a higher flowing panel filter as most suggest is a reasonable and safe mod to do, should cause similar changes to the MAF readings also and noone seems worried about that?

Even worse then how many have changed to an induction kit and not had a remap? Quite a few I would suspect? Any issues? Doubtful.
A remap is on the way after some BC coilovers and Rotas...

Rob Day

iTrader: (78)

Sounds like you have your heart set on changing the oem intake, good luck, and I hope it all pays off for you.

Where are you based for mapping?

Rob

scatty

iTrader: (1)

ive got a k and n typhoon sat in my garage, took off yesterday...£70 or nearest....

Tim(e)

Well like I said that would surely be even worse than removing the resonator judging by this thread...

Rob - Northern Ireland!

Splitpin

It's a learning curve you've chosen to give yourself a leg-up with by asking questions in a technical forum like this. Asking questions is furry muff, as is wanting to find out things for yourself (although if you ask for advice, and ignore it, it opens the possibility of those answering skipping by your posts in future).

The problem with this particular "simple free mod" is that your engine can't tell you whether it likes what you've done or not. It might well be fine, assuming your car is standard. However if some of your safety margin has been eaten up by something else, it might not be.

There's good noise and bad noise. IME the noise you're getting now is bad noise. Besides, as far as "loving noise" is concerned, there are more than a few who'd prefer their cars to be quiet enough not to attract the wrong sort of attention. Stealth has its advantages.

Splitpin

On its own it may not break the engine, but in concert with other issues it could contribute to a problem and definitely affects mixture calculation on an ongoing basis. None of that is guesswork, I've tested it and have the data to demonstrate it in practice. Had the resonator delete made any positive difference I'd have left it on, as this would have been less hassle than taking the wheelarch apart to put the standard bits back in!

That's a bit of a pointless/silly question from someone desperate to try and hold their argument up. In most cases the mechanic looking at a broken engine won't be sufficiently well equipped to determine whether an issue like this was a contributor to a failure, especially when, as above, it is unlikely to be a single direct cause on its own.

I'd suggest that your "serious doubt" is a bit trumped by all the fact that respected folk have actually tested it, in detail, with instrumentation under the bonnet to determine exactly what's going on.

Not remotely. Practical testing demonstrates that without the resonator, you see significant amount of turbulence/pulsation in the inlet air as it passes the measuring element - with resultant inconsistencies in measurement that were sufficient to pass through the error control system and affect load calculation, at least on the car I tried it on. There's no logical reason to believe that the effect isn't similar on others, albeit that the degree may vary with different tract and MAF designs.

As above the effect of the filter on airflow fluctuations is minimal. And, more to the point, the effect of the filter is consistent, which is why your suggestion is incorrect.

On the contrary, there are more than a few people here who have blown engines (or caused less than terminal damage) as a result of fitting induction kits, whether due to direct misreads, or indirectly due to the damage to the MAF sensor caused by installation in the induction kit. On what basis do you "doubt" this is possible?

Newbie: A word from the wise. You're in a technical forum speaking to people who've been involved in this subject longer than you. If you're here to learn, wind it in and learn and we'll all get along fine. If you're here to pretend you know better than anyone else and show attitude when debated with, you won't last long. Lecture ends.

Tim(e)

Thanks for that I stand corrected I guess, but as others on here have chosen to carry out this simple free resonator delete mod so have I. I may decide to put the resonator back in at some point but again thats my decision.

Thanks for the advice and opinions. I've learnt something else about MAFs now...

aXeL

Spot on Splitpin. When I changed the induction on my 54 STI it took me days of remapping and diagnostics to make the engine safe again.

If it was easy to embed piccies here I'd show before and after shots of the induction royally screwing up my AFRs. My engine was just waiting to stick a leg through!

Rob Day

iTrader: (78)

Maf sensors on a newage are around £200 new to replace i think, running a car eith a dodgy one if gone un-noticed can be leathal.

If you look after your car, the car will look after your wallet.

Good luck, post some pics and info up of the results of your mods, always makes interesting reading even if some (most) scoobynetters disagree with the mods.

For the record I bought a aftermarket induction for my 2001 wagon around 4 years ago, I unpacked the kit and started to look at the assembly instructions where it read "you ought to feel some power gains" and "If you are unhappy with the cold air induction kit, please retun it back to us unsused" both statements forced me to post it back the very next day.

nick172sport

iTrader: (6)

enough said engine rebuild in the waiting lol ill get my coat

carl heath

splitpin-dont mean to be nosey but im interested as to what work you do with these great jap cars of ours,i allways see your posts and think to myself " i would like to know what line of buisiness he does " as your knowledge seems endless and half of what i read i have to read again to take in and then it doesnt stay for long, LOL.sorry if what you do is private or allready well known.

dynamix

iTrader: (3)

or thinking it was flowing more air perhaps.

A before and after on the dyno would prove it, swapping out the parts and reflashing it between runs.

Back to the OP.. there is no real need to fit an induction kit to release power, although they 'can' help sometimes but they definitely need to be mapped for.

71/200

iTrader: (2)

Tim, where abouts are you in NI? We have a local forum and i bring JGM over to map as i wouldnt use anybody in NI due to lack of experiance.

Alot of people disagree with my last comment but NI based mappers maybe map 1 car a month if they are lucky, the mainland mappers are doing it everyday.

Lots of good advice on this thread by those in the know.

www.scoobyireland.com

Rob Day

iTrader: (78)

Oh dear Nick , whats happened?

Rob

aXeL

If it only thought it was flowing more air the ECU would still put more fuel in and the wideband would've been reading rich but we both saw it was lean.

Agree about the dyno - smacks of effort though!!

L.J.F

iTrader: (31)

You nosey git