i don't know enough about such things, but my 'social/environmental conscience' tells me i should do this. though i don't have such things as MOT over here, though the car still needs to be 'roadworthy' and comply with regulations, which dictates a cat must be in place.
i think that basically means i can change to a high-flow cat, but still need a cat.
It all depends... I do have a version of MOT here, and my car passed 3 years in a row without the cat fitted... CO and LAmbda levels were all in spec..
aside from K&N, what is an alternative good option, that doesn't require 'oiling'. cleaning/oiling seems a bit of a black art, not to overdo the oil and knowing when to clean it, etc. i'm all for low maintenance! but i know it's all relative, but a simple drop-in replacement would suit me better.
Pipercross seems ,to be my favourite for the moment.. The oiling bit is not as important with the 8v anyway, it uses an AFM instead of a MAF , the MAF being more sensitive to polution.
is CDA a brand, or simply a generic cold ducted air intake? there are no alfa parts off-the-shelf in australia for a 155, but i'd happily buy online if people can recommend something.
i will do a search in the forums for more info...
156_tspark_boy wrote a few posts about cold air ducting and aftermarket filters in the tuning section, have a look there. If you don't want noise, go for a panel filter...
what happens to 'loudness'? i'll have to find a schematic of the 155 exhaust to fully understand what you mean. but a 'straight through' pipe is presumably going to be fairly loud; possibly drony. something i need to consider.
Loudness depends on the size
and type of the backbox fitted. I have a Remus backbox, and although it's the only box left on the system, I'd argue the car isn't any louder than standard, but has a deeper sound. Originally the car had 3 boxes and a cat... to put it another way, if you fit a cone filter or cda, the engine noise will drown out all the exhaust noise....
have people done this, with good effect? just curious about any feedback. something i will search about too.
No, I figured this out on my own.. I was thinking about adding a fuel pressure regulator, or bigger injectors, but the cost would've been fenomenal, since either requires a custom remap (add another 500euro easy). A bit steep for something that will only benefit me in the 5000-6500 rpm range...
But then I read in the alfa workshop manual that the 1.8 uses the same ecu, but adjusts the fueling in the way I described above...
By upping the fuel pressure about 10%, we increase the maximum fuel output of the injectors aswell, and by reducing the pulse width of the injectors again by 10% the fueling stays in spec. This is what that 500 euro remap would do aswell... Can't see how it couldn't work, but if so you're just in it for a fuel pressure regulator and gauge. set it back to standard pressure, remove the plug and you're back where you were.