Edcase

Okay, I know this has been covered countless times, and I have read all the threads and talked to several knowledgeable people.

But I'm still paranoid

I am visiting TSL next week for a few bits, but my budget won't stretch to uppipe and remap, so I am considering just getting the downpipe to match my system for the time being.

How many people out there are running MY01+ cars with decat downpipe and centre, but standard ECU and upipe??

Have you experienced any issues at all other that the well-documented CEL fix?

Have any of you done track days with this setup, and still experienced no issues?

I don't want to risk causing any problems with the running of my car for the sake of impatience!!!

-=Buzz=-

I've only got three sections of stainless pipe on mine, I took one cat out, but not the up or down pipes.

I suppose thats no help at all

Anyway, apart from that my 01 WRX is totally standard, and I've had no issues at all, not even the well documented ones.

[Edited by -=Buzz=- - 18/07/2003 18:44:43]

mutant_matt

I *think* it runs fine other than your check engine light will stay on. I would personally wait and get the downpipe and the remap done pretty much at the same time to be sure....

Matt

Edcase

Matt-yes there is a fix for the Check engine light I believe.

With all of the stuff happening over the next few months, I just cannot afford the extra for the upipe, headers, fitting and remap, but as I have done so many chassis mods, the car currently handles too well for the power, so I am desperate for a little boost.

However, I have been so sensible up till now that if there is any risk, then I will wait

Spooks

What are the "well documented issues" as Im prolly about to buy a scoob that is a full decat but no remap. Appreciate that the CEL may come on after a long run but I didnt think there were any other issues.
Laters
Spooks

Edcase

Spooks - basically the check engine light and I have heard reports of a little overboost in certain atmospheric / driving conditions, although that seems mostly limited to the STI.

Also to add, I have a full complement of knock link, gauges, and SECS monitor so I wouldn't be running blind so to speak.

Spooks

So how do you overcome the CEL then?You mentioned a "fix". E-mail me offline if you prefer.
I reckon thats a good move having the guages anyways, first thing I would do with any type of BHP increase alteration.
Thanx
Spooks

bug-eyed wonder

I've been running that set up for a year now with no problems at all. Got the CEL "fix" fitted too.

No gauges just Esso SUL and drive it!

No track days though just relatively sane road driving.

[Edited by bug-eyed wonder - 18/07/2003 19:50:31]

Edcase

You will find that 99.9% of cars that have had a decat downpipe will already have the cel fix, which simply consists of a transistor welded in to fool the ecu.

Edcase

Bug eyed wonder - silly question I know, but I am presuming you have given it some prolonged bouts of 'press on' use???

bug-eyed wonder

Yes the car does get a bit of stick every now and then.

bug-eyed wonder

It has been mentioned to me that serious abuse/track driving "may" result in the Cat in the up pipe breaking up and that's really bad news!

I'm not the one to ask though,more of a just stick the petrol in and drive it sort of owner!

donutman

sorry for hijacking but i am about to put a decat centre and a rear box on a my99 would this also bring on the cel?

Edcase

BEW - yes I have also heard this, although never from the horse's mouth, it has always been almost like an old wives tail hence my posting here

Donutman - no you will have no problem

M0NEY

See you spend to much on all the other mods! lol

I wouldnt worry about the remap yet - see how the car goes. You might find it starts overboosting, then get a remap definitely.

Would get a remap soon though cause it will get that extra bit of power to

-=Buzz=-

No, I think that only happens if you replace stuff further forward than the centre. And even then it's only caused by the increase in temperature of the exhaust gas being detected as a "fault", which it isn't - it just hasn't had to go through the cat and therefore hasn't had as much time / surface area contact to cool (I think, but don't quote me on that! ).

I did exactly what you are going to but on an MY01 WRX, and that hasn't caused any lights to come on.



[Edited by -=Buzz=- - 18/07/2003 22:26:06]

Edcase

Frank -

Yeah I may just do that, however I have several trackdays and a long weekend at the nurburgring coming up so last thing i want is engine trouble

Are you at billing next weekend for JAE??? I'm there Sat.

Tino

Had a complete decat on 01 WRX for some time now and no probs.Scoobysport do a widget to fix the engine management light.
Recomend that you get an up pipe ASAP as I've heard horror stories of them breaking up and damaging the turbine blades in the turbo.
TTFN
Tino
PS light took about 2 weeks to come on on mine

[Edited by Tino - 19/07/2003 00:12:26]

Tino

http://www.scoobysport.co.uk/exhaustswrx.htm
Scroll to the bottom of this page for 'widget'

wrrjones

ive got dp and full system and i fitted a dawes set to 1.2 bar no probs at all your ecu should compensate with it being a learning ecu mines been fine but my02 wrx is jap so i dont no what it would be like on a uk car but i would have thought it would be simmilar apart from less power .. the dp on mine made a differenc to the turbo spool up ie quicker and i now get full boost at around 3600 rpm before it was at about 4000 rpm and this is solid in 4th all way to redline with no drop off .. if you fit a dawes just fit it to stop boost spikes ie set to 1 bar ...chris

LoFi

my pennies worth,

had mine with just downpipe, center, rear etc for sometime with no problems before i went for uppipe and remap. AFAIK the uppipe break up problem would only normally apply if you have upped the boost via a remap (increasing temps) hence why remaps without an up change run lower boost. Didn't track mine though.

LoFi

stephen emery

do you not find the check light comes on after a while due to burning out of the EGT sensor on a full decat?

steve

Edcase

Guys - thanks.

Stephen i believe that is only a problem when you lose the uppipe cat / run more boost.

Nathan L

My car eats EGT sensors every 10000 miles. On my 3rd now

I am running full Decat and 1.3 bar though

Ed I've still got my old PPP piggy back board somewhere that I ripped off the standard ECU for the TEK3 if you wanted to try it on your car?

Nathan..

Paul_M

MY99 Won't have a problem with CEL even with full decat because there's no EGT sensor. There's also no up-pipe cat, only the downpipe and centre ones.

stu200

iTrader: (1)

Ed,

My bug-eye's had a turbo-back decat for the last year or so, whilst retaining the up-pipe and unmapped ECU. Since then, it's done a number of trackdays and a number of days running up and down autoroutes in excess of 100 mph for six or seven hours at a time.

Only difference, apart from the obvious, is that it runs a little rougher than a standard car, but a remap (whenever it gets done) will smooth it out no problem, I'm told.

You get the occasional CEL come up - mainly during motorway cruising - and its' always been "catalyser below efficiency threshold" - no **** Sherlock !!! As it happens, I have a spare Scoobysport CEL-fix widget, never fitted - drop me a mail if you want it.