R33 intermittent loss of power.

[Redknight]

R33 intermittent loss of power.

R33 intermittent loss of power.

Hi guys. 

I have an R33 gtst series 1.5 

List of mods

Full high Flow xforce exhaust 

K&N pod filter whith heat shield 

Blitz front mount intercooler 

Spit fire coils

New spark plugs ( unsure of brand) 

Power fc tuned by legend matt spry

Z32 airflow meter

Stock turbo running 13 pounds 

Car is making over 200kW at wheels

I have several issues. There are days when my car feels nice and responsive and goes like a bat out of hell. And there are days when I feel like I've lost about 30 hp through my mid range top end power. At times my accelerator feels less responsive / sluggish and boost doesn't feel like it comes on hard. Also the car back fires and splutters at times and feels like the car is vibrating and shaking slightly when at idle..but not always.

At times it feels like boost is flowing through a McDonald's straw. 

Now the other strange issue is sometimes when I stab the throttle to rev match the car will bog down but not always.  It's very inconsistent. And my fuel economy is terrible. 

I have also noticed some oil leaking from intake manifold. I was advised it could be a sqaushed gasket causing boost leak?

Only strange thing matt spry saw on the dyno was the 02 sensor was crapping out when the car is cold and dumping crap load of fuel but fixes itself when it warms up. 

Could it be piston or valve issue guys?

Problem is extremely frustrating and has been happening since I've owned the car. I just want my pride and joy to be running 100%

Any help would be appreciated guys.

 

[hotz]

Have you checked vacuum hoses to the intake manifold and waste gate?

[89CAL]

The ECU dumps more fuel in when it is cold. Have you done a compression test? Tested for boost leaks? Checked to make sure the turbo is healthy? Checked for exhaust restrictions? CAS in good order?

You need to have a bit of a look at a few things I think.

[Tobster]

Having the Exact same problem, also having idle issues even after i cleaned the AAC valve.