Or something like that?

Scanned a mk5 GTI Golf and it had three faults do with the intake manifold runners, and a short/open to plus for a G336 sensor "tuning valve"

Got no idea personally. Car was stage 1 mapped, and was suffering with a dip (dyno proven) from 5,500rpm to the redline, and this was backed up by falling boost levels (in relation to steady specified levels) in the upper rev range.

It has an intake manifold runner or tumble flaps which aid cylinder filling at low RPM.

Did you log requested against actual fuel pressure? Who's map was it?

It has an intake manifold runner or tumble flaps which aid cylinder filling at low RPM.

Did you log requested against actual fuel pressure? Who's map was it?

I did - fuel pressure seemed OK. - Its a Celtic Tuning remap. I didn't want to say anything, but inside I was thinking "Oh bugger"

I've looked back and fuel rail pressure requested was 110bar, and it looks like the max it did was around 112 to 113.

Boost was doing this on full throttle. A good 0.4 bar down on requested about 4500/5000+ revs, and big dip on dyno as well.

REVS / REQ / ACTUAL

4360 2230 2080

4560 2220 2000

4760 2200 1980

4960 2190 1930

5160 2170 1890

5320 2150 1840

5520 2140 1800

5680 2120 1770

5840 2110 1720

6000 2100 1710

6160 2100 1680

6280 2060 1640

6400 2020 1620

Could be a split DV if it's not making requested boost.

Have not heard that description before but i'm having my inlet manifold runner flap motor changed this weekend. Mine is faulty on an intermittent basis and on the golf/audi forums it seems to be a common issue (less here for some reason). Can't wait to solve my lumpy idle and poor performance.