Clicking over 4k, low boost, burning smell?

Bought an '06 Legacy GT with 112,000 miles. The tube went out 2 months after buying it. We replaced it with a EVO 16G from BNRsupercars and a Cobb Tuner. Everything has been alright, but we notice that after about 4k RPMs, we hear a clicking noise. If we hold it above 4k, it throws a CEL and something about advanced timing. Easy fix, we just don't I over 4K. (If it hurts whenever you hurt your elbow, don't hurt your elbow.)

Now, when go up hills, after driving for a bit, we lose power and only get about 8PSI. The temperature goes up and it drives like crap. Get back on a flat stretch, everything's working fine.

Did some research and saw people were having issues with their oil control valves. Pulled both the drivers side and passenger side, the drivers side was fine, but the passengers side is completely locked up. Totally jammed. Tried spraying PB blaster, still nothing.

I'm assuming this is the problem (and probably the cause of my previous turbo failing) and once we replace this, everything will run smoothly.

Would that also cause the clicking over 4k? I read that the OCVs control timing.

Thanks guys! (And gals)

The advance cam timing CEL is a lot of times assign of oil starvation to the turbo. The clicking noise is probably the sounds of a dying turbo and I suspect the same oil starvation issue took out the previous turbo.

More info here: http://legacygt.com/forums/showthrea...ighlight=P0021

Originally Posted by Spec B

The advance cam timing CEL is a lot of times assign of oil starvation to the turbo. The clicking noise is probably the sounds of a dying turbo and I suspect the same oil starvation issue took out the previous turbo.

The thing is, it was making the clicking noise immediately after we replaced the turbo. That's what seems a little strange.
I also installed the "Infamous Performance and Tuning Turbo Oil Supply Kit", which gets rid of the banjo filters, right?

Or do I need to purchase the AVCS Line Kit as well?

Again, only above 4k. Other than that, I get about 8 PSI before the 4k.

I would think that the infamous line would have solved the oil starvation issues (but I am not sure how the stuck OCV might reduce oil flow) - try replacing the OCV. No idea what the sound might be - but considering it is happening in conjunction with only 8psi of boost, I am still leaning toward the turbo.

Not sure what DP you have - but the early version of the invidia divorced WG DP would sometimes interfere with the WG flapper and make a rattling/clicking sound. However, I don;t think it effected the ability to build boost.

I haven't replaced the down/up pipe yet.

I was thinking about replacing the up pipe first, as it would help the bigger turbo.
Would you say that's the next best step?

The next step is figuring out what is going on above 4K RPM...

I assume someone tuned your new turbo setup?

I do have a Cobb tuner, but no custome tune. I ordered it through Perrin, who can make a custom tune, but I figured I should make other upgrades first (like the up pipe).

I'm currently running the stage 1 91Octane tune.

You need to take a step back..your turbo needs a specific tune - you can blow the engine.

1- I would start by reverting back to the stock tune and disconnect the actuator or do something to assure you are running just wastegate pressure on the turbo. Running that turbo on anything but a custom tune can damage your motor.

2 - don't drive the car unless you need to and stay out of boost

3 - replace the OCV and see if you got lucky and that fixes the problem

4 - get a custom tune ASAP

K. I will do that.

Will a custom tune from Perrin using my Cobb Tuner do the trick? Or do I need to get a tune in person?

Cheapest/easiest way is to get an e tune. Infamous and cryo and others offer them here.

Good luck.

Thanks for your help

fix the problem before going to tuner.

this is a heavy thread because there are multiple factors at play. scenario set:

1. temp rising going uphill, steady on flat surface- headgasket failure. coolant in oil thus reducing viscosity of oil thus rod bearing failure thus clicking noise at over 4k rpm. rod bearing failure then clogged banjo filter thus throwing ocv code.


2. wastegate boost means your ecu dropped to an IAM below .62, or a specific set of CEL were triggered. I'm not sure but I don't believe ocv CEL are in the limp mode group, but I could be wrong. it could be simply ebcause you arent tuned correctly and knocked your way down to limp mode (which can happen without a CEL)

3. seeing as you have the infamous oil line, chances are turbo oil delivery is fine BUT if the banjo bolt is clogged it will reduce oil flow to the ocv and the turbo at the same time. thus causing an ocv CEL when the ecu is calling for ocv duty cycle and there isn't enough oil flow to achieve x duty cycle, thus throwing a code.

4. ocv solenoid failure causing poor performance and CEL. however failed ocv solenoids usually cause idle issues as well, misfires, lumpy idle, etc.

5. the cat in your up pipe has dislodged and is loose, when given acceleration the exhaust gas causes it to bounce around potentially causing knock sensor to go nuts, thus reducing your iam and causing 7-8psi wastegate boost. unlikely but possible.

Thanks ripemeat for the detailed response!

Does that infamous line not replace the banjo filter?
I saw two different lines that they carry (which I had links to in my previous post). Do I need the other line as well?

Someone suggested that it could be a fuel delivery issue, stating that I might need bigger injectors. That might help the clicking over 4k.

And would it help if I put my captured log data up?