Hey all, just fitted a de cat pipe and apexi hybrid turbine to my motor. I seem to be getting lots of popping and like a juddering under load every now and then. It's hard to explain but it kinda hold's off judders and then full boost comes on, the problem seems to be intermittent.

I have reset the ecu, changed the fuel and cleaned out the standard boost solenoid to no avail. It's only started this after changing over to these bits, the only thing that's not on is the oxygen sensor as this was seized in the old downpipe but i've been assured this will not affect anything on the car.

I don't suppose anyone has any idea what's going on? long shot I know but worth the effort.

The boost is between 0.5 bar and 0.8 bar depending on how it's feeling. Other mods are hks exhaust and filter.

 

If the oxygen sensor isn't required, why was it fitted in the first place???

 

Exactly, i belive these were not made after MY96.

Town end leave them off on all pre 96 downpipes.

Anyone any further comment regarding the oxygen sensor?

 

So you've got a standard ECU, a hybrid turbo and no lambda sensor ?

:-)

Please confirm you're not winding us up, before we continue.
If not, please tell us who sold you that combo ?

Your profile says you've posted 6454 times since May 2001. That's about 50 times a day. How do you find the time ???

Regs.

Steve

 

Steve, it's not the lambna sensor it's the oxygen sensor these are different bit's mate. My lambna sensor is on the front of the exhaust near the crossmember not on the downpipe. After 96 the oxygen sensors were done away with.

This is not a wind up i'm running a import wrx with a apexi turbo, whats the problem with that? I'm not after a ecu as i don't want mad power. I'm just going to get a boost controller, and fuel meter probably avcr and afc units.

Just you leave my post count outa this..

 

Btw the ecu is showing no faults.

 

Sorry I can't be of any help - not familiar with the older MYs.

Steve

 

oxygen sensor/lambda sensor are the same.sure it's not a temp probe thats been left out?

 

Nope defo told that it's a oxygen sensor, the lambna sensor is still there. Could be a temp probe though, it's situated on downpipe near the cat? Would this affect the car under load though?

Ecu showing no faults so cannot be that important.

 

'Snot a 'hot cat' switch then ?

 

I wouldnt have a clue..Only told it's a oxygen sensor, i'm no expert.

 

Would taking it to somewhere with a select monitor not help you maybe Crypt?

 

Does that check the Ecu? If so i've already had it done both memorys are showing no faults. I belive there are 2 on wrex?

 

So why do you suspect that it is an oxygen sensor fault????

 

I don't, i've been assured that this would not affect the car. Someone mentioned that if it didnt need it, it wouldnt be there.

I havent got a clue what it is, but it's only started doing it since changeover so somethings causing it.

 

Boost is between 0.5 and 0.8?

Mine boosts at 1.1-1.2 since I have had it and it seems standard AFAIK.

What did it boost before all your mods?

 

Same, i belive the standerd boost is 0.8 bar. Doesnt seem to hold constent boost to me, need it rolling roaded.

 

Hmmmm, I have always resisted having mine rolling roaded with it being a WRX, maybe I am too over protective over my car, but I don't fancy holding it at peak revs in fifth for a while.

Would be interesting to see your results though

When was your car last serviced?

 

A while ago, gotta be 6 months. That was just oil, filter and plug change. Must change cam belt it's only just turned 42,000 miles though.

The specialist thinks its some air leak or the boost solinoid sticking, thought it was worth the ask on here though.

 

Most probable that you have an air leak crypt.

Your car is not boosting at the level it should.

 

Cheers for the help chelle, i'll take it round the corner to the specialist this week.

 

Okay, glad to be of assistance

 

Why wouldnt you r/r your wrx chelle, need to know as i was gonna r/r mine this week......???????

 

Crypt. 0.8 bar is the standard boost on a WRX for your MY. Chelle, if your boost is 1.1-1.2 bar then you are running above standard boost. Do you know why its at that level?

With regard to the popping and juddering I would have thought this could be down to the standard ECU not performing with the hybrid turbo. Your ECU could well be performing correctly but if your turbo is bigger and slower to spool up the the engine is getting considerably less air at certain revs than the ECU is expecting and may be causing you a few probs. You could do with someone more technically gifted than I to confirm but I would have thought you'd need a mappable ECU to run a turbo such as the Apexi unit.

 

I agree should hold better boost. Get it on a rolling road ASAP. BTW they don't hold engines on peak power in 5th gear ! Ignor the scaremongering and get it sorted by a professional ASAP..Could be costly if you don't.

 

Cheers dudes, I belive i can run this turbine sucessfully using a boost controller and air/fuel controller like afc/avcr units by apexi. Boost control is No1 priority at the moment. It's strange i've had no hold off today or judder, i'm sure it's a air leak or something.

B.t.w Disco, i think it's time you returned to the collective.