hmm decat?

[pearl_rex]

so im thinking of getting a new exhaust including the decat for when i get my car back on the road...its a 93 r\' will it need a new ecu to take the decat? its standard apart from hks filters, blitz dump valve and will be non sequential, just dont know if its worth getting the decat or not as i dont want it to run like crap as soon as i get it back lol!
 
thanks in advance,
 
ste :cheers

[RobbieRX-7]

Yes, it\'s going to need a a programmable ecu if you go decat and non seq. Most popular choice, and the cheapest is the apexi pfc. It wont run like crap unless there is something else wrong with the car. On the other hand, if the car is running fine now, it will run even better on a pfc right out the box because it\'s much newer 16bit technology than the 15 year old 8bit mazda ecu, then you go decat, non seq and get it remapped. You wont be dissapointed so YES, go decat, fit the pfc and release another easy 60-100bhp.

[pearl_rex]

60-100 from a decat and pfc?! seriously?? i was thinking more like 10-15 max lol

[NurburgRob]

I think the popular opinion is that you can either change exhaust silencer or filters but if you remove the cat you will need to remap the fuel to match the additional air through the engine.  If you get a cat free exhaust and open filters you will definitely need to remap the fuel.  I\'m in this process right now and I\'m looking for a cat replacement pipe.

APEXI PFC is a popular choice, that\'s what I\'ve opted for.

[RobbieRX-7]

yeah seriously. At the time, I decatted mine, k&n air filters, 3" ss downpipe, silenced mid pipe and free flowing WGT backbox stock everything else and i got 320bhp from the stock 250bhp. Even putting the pfc on a stock car, i reckon you get about 20+bhp without getting it mapped by a pro.

[pearl_rex]

lol thats mad!! i love rex\'s!! and hey i didnt know you can get k&n\'s for the rex?! are they actually made for the car or just 2 universal ones?cheeky but any chance of a pic? please? :god  so for about 700 i can squeeze a fair ammount out of the rex? will it run an extra 100bhp safely? not forgetting that standard its 280ish i think?
 
cheers for the replies guys im now >>> :chat

[RobbieRX-7]

Yes, they are specially made for the car. These are the same as mine. http://www.mazdarotaryclub.com/forums/showthread.php?t=51156 But mine have the blitz cast aliminium section with the twin K&N filters on the end.

[Nik da Greek]

The K&N ones just have a black placcy housing as standard, IIRC, but like Robbie says, they fit on the ally Blitz housings too. Catalogue piccy of them if you\'re interested;
[ATTACH]40165[/ATTACH]

[pearl_rex]

ahhhh very very cool thanks alot for taking the time to do the pics guys, really apreciate it might have to look into ditching the hks\'s for some beefier looking k&n\'s!!
 
thanks again!!

[Nik da Greek]

HKS filters are just bloody nasty, chuck em in the bin where they belong! They\'re a bathroom accesory, nasty bit of foam, not a fitting filtration system for a performance engine :Giggle!

Joking aside, they\'re fine when they\'re clean, but wait till they get clogged up and filthy, and the engine starts sucking the edges of the foam in around the base of the cage cos they can\'t flow enough air through the foam any more. Before you know it, you\'ve got a lovely big gap round the edge of the mesh where loads of nice unfiltered air gets sucked in, using the course of least resistance, and taking with it small rocks, passing wildlife, fluff, spiders, loose bolts, well... you get the idea!

[gandyRX]

ive got a decat on mine, it overfuels abit but runs so much better and shoots flames

[sickboy2345]

just keep in mind that upgrading it and squeezing more power will shorten ur engines life....just bare that in mind

[Cooch]

not by much if all your doing is decatting her surely.

[Timmy]

i\'ve found that decat exhaust and filters are enough to max out stock injectors so must be about 320-350bhp.

[Cooch]

really? Woohoo. Lol