I bought a bugeye wrx a few weeks ago and saw somewhere on here that if it has a decat exhaust on it then it will need to be re mapped. Is this correct?
I only ask as I had it in the garage the other day and when it was up in the air I noticed it had a decat exhaust on it and both lambda sensors were on it.
The guy that sold it me didn't say it had been remapped but did say that he had put the exhaust on it.

 

The Bugeye WRX with de-cat does not need to be re-mapped to work properly.......the ECU can cope with the changes but there's not much change in performance.

The Bugeye STi is different as it usually throws Boost spikes if de-catted as it has a bigger turbo

I'm not sure if it has been de-catted as the ECU throws CEL P0420 as it thinks the emissions are going pants..

The options are.......

1. It's de-catted and has a CEL fix or re-map so there's no CEL light.

2. It's got the OEM up-pipe cat and a cat behind the turbo somewhere so the ECU is happy

Shaun

 

Fantastic cheers.
I have no need to worry then as it's only a WRX.
I was hoping it was just the sti that needed a remap.

 

The lack of a CEL (P0420) saying you have a de-cat is a bit of a worry if you have one.......someone might have taken the bulb out

Race Dynamix could sort you out with a reasonable re-map to get the power up to 250-260 which would end the speculation

Shaun

 

Hi all, I am also having similar problems. I have a 2001 bugeye (wagon) when traveling on motorways the EML comes on was coming up with "Bank 1 too lean" this was happening around christmas time, but now i have noticed that im using more fuel and especially on start up it stinks of fuel from the exhaust. Was on the motorway sunday and the EML came on and this time was code P0420.
It has a de-cat from turbo back but still has original up pipe!
Any comments would be a great help, thanks.

 

Where are race dynamix?
The guy did say that the exhaust had been made so that the car will still go through an mot without failing it's emissions test, so maybe it has a cat behind the turbo.

I could realy do with finding out more info on this.
If it is a full decat would it cause any problems? If so what problems?

 

I am in cambridgeshire but travel all over.

If full decat, the only problems (post remap) are getting through the MOT. You may be able to get away with a decat on a bug wrx but you will need a remap to get the best from the modifications you have made. Power after remap will be around 270-280 if fully decatted and run on good fuel.

 

I am in cambridgeshire but travel all over.

If full decat, the only problems (post remap) are getting through the MOT. You may be able to get away with a decat on a bug wrx but you will need a remap to get the best from the modifications you have made. Power after remap will be around 270-280 if fully decatted and run on good fuel.

 

I was thinking of putting a good panel filter, dump valve and turbo back decat on it then going for map. what BHP would I get then? and is a good panel filter as good as the usual after market ones?

 

Forget the DV idea - keep OEM one in situ.

Cosworth, K&N or Green for panel.

Yep, just the d/p "1st section" decatted will be okay (have some chance of getting through MOT with the other 2 still on ).

Get a Walbro 255 fuel pump, a fresh fuel filter and a new set of plugs (the "7" heat-range ones for your car is a good idea).

After an EcuTek remap on your existing ECU, expect 270-280...

 

I can get it mot'd with emission failure
I've got the NGK Iridium 6 plugs.
Why would it need a walbro though Joz?

 

I wouldn't run the car hard with a decat as some WRXs will det badly at low rpm with a full decat on the standard map. It may be okay, it may not but having listened to some det that I've checked, it's not something I would recommend doing for any length of time. If it's an bugeye I would guess the MAF sensor is pretty tired by now too so it could be a doulbe whammy.

As always, your paticular case may vary.

 

Always good that, innit?


No worries.


Prob don't need one per se - just that it gives peace of mind as there's more thatn enough fuel flow, plus it's new - so 99.9% will deliver constant flow. For the sake of c.£70, I wouldn't risk it...

 

I got this back from the seller to confirm system.

custom made full stainless steel straight through exhaust with a bolt on chrome 2nd decat pipe with lbr sensor, which as with subarus they have 2 cats so it will still go straight through the mots as the main cat is still present.