Help! Loss Of Power, Strange Noise

[MBS206]

Hey all...

I need help.

As of late my car has been back firing a fair bit (From bad plugs, plus I caused it to a few times also)

Now, the car has a new strange noise to it (It had NONE before), it sounds a touch like someone attempting to blow a whole heap of air through as traw, but, the strange thing is, I'm having ZERO pressure loss.

When I boot it, the car just won't pull at all, feels like a complete dog, and makes that weird noise.

Now, the car "seems" to drive like normal down low in the rev range, on low throttle, although, of late, I've noticed that the car is needed more and more throttle to get moving along, I used to cruise off with 10mmHg, without an issue, now I'm needing to actually bring the car up to around 2-3PSi of boost to get it moving.

When moving it, the car just feels so slow, and pathetic.

The car has:

3" Turbo Back exhaust

FMIC

Boost controller (set to 6PSi low and 10PSi high)

All new intake piping

Lightweight flywheel

Splitfire Coils

On the dyno, the car read a AFR of around 11.8 - 12.0 on a stock ecu, so either fuel filter needs replacing, or pump is dieing (i've been told by people on here, most likely pump, so it's getting replaced soon)

Car will be getting serviced this weekend (oil, filters, sparkys)

The car doesn't misfire at all.

Does this sound like a dead/collapsed cat? I'll be getting another compliance cat to throw on soon just in case it is my cat.

It doesn't seem to be a vac leak, as it doesn't have issues when on boost except lacking power, and doesn't miss etc.

Car just has strange noise whilst on boost with no power.

Edit: Car is an R33 GTS-t Series one.

Edited April 3, 2007 by MBS206

[-_-StRyDeR-_-]

does it sound like a exhaust type of air leak mate?? cant hurt to check the cat, 10min job

[tridentt150v]

What is your 'all new intake piping' made from?

[MBS206]

The intake piping is all stainless steel.

The piping has been on there for a while, so not new new, just not stock.

It just sounds like somewhere around enginebay on passenger side, towards underneath the car as a major air rush, like massive turbulence etc.