Power loss when warm

[dkw_dude]

Hi
After my S2 is warmed up (normal driving) it suddenly loses power. At the same time idle drops from 850 to 750 RPM. When losing power it runs like a standard S2. It has a RS2 turbo/manifold 3inch turbo back and chip for the mods. Cone filter, shielded with u-bend.

The boost is there, but it does not run as hard as it should. When it works ok it so much quicker, I have a hard time controlling the smile on my face!!

It has recently been pressure tested @ 1Bar, no big leak, tightened jubilee clips, MAF and O2 sensor fairly new.

I haven't checked the altitude sensor yet, but will do.

I am hoping for suggestions from you guys, need to get the car working properly again, I miss the RS2 power!!
Regards

[porkkis]

No big leak sounds bad. No leak at all would sound better.

[dkw_dude]

No big leak sounds bad. No leak at all would sound better.

OK but I don't have anyone to compare with. From 1 Bar it leaks down to zero in ~ 1-2 minutes. Plugged the crankcase breather on the MAF to turbo hose when pressure testing. And the hose to the wastegate, has a slight leak in the valve stem. Diaphgram on the WG is ok.

[porkkis]

Ah, we were talking about the tiniest leak one can measure

Forget it

[audiman]

Pressure test to just above what the car normally runs at. Sometimes a leak wont show until its under full pressure. For example if the car should boost to 1.8 bar pressure test to 2 bar.

[dkw_dude]

Pressure test to just above what the car normally runs at. Sometimes a leak wont show until its under full pressure. For example if the car should boost to 1.8 bar pressure test to 2 bar.

Yes, have thought of raising the test pressure. The car boosts around 1,5 Bar, 1,7 Bar pressure should reveal any leaks.

I am just sceptical of putting that high pressure in the MAF to turbo hose, will it stand it? Or will the test bung (that what I think it's called) gun off ? If you guys tested with such high pressures, then I will give try too.

Porkkis: Thanks for pointing it out anyway

Note: Bought a compressor a while ago just to pressure test the car, have used it more often that I thought of initially...
Cheers Leif-Helge

[audiman]

Some of us have to pressure test to over 2 bar!!!!!! Hoses will take it if in good condition. If they pop then they are crap anyway.