severe power loss

[jaygtir]

my R only does it every now and again, but i'm getting worried.
when booting it, as turbo is spooling it all of a sudden stops and the car nearly stops dead, throwing me toward the windscreen. then works fine after.
pushing nearly standard bhp with goose backbox, kn filter and forge d/valve.

i have'nt got a clue as to what the problem is (hopefully something small)

any help would be appreciated guys.

 

[Fast Guy]

What speed/gears are you doing at the time?
Is the engine hot (as mine doesn't like over 4000rpm when cold)

 

[kizzyturbo4x4]

got boost readout?
might be fuelcut?

 

[jaygtir]

normally in a low gear (2nd or 3rd i guess). if i remember right, it is normally after a long run/good thrashing.

you guys reckon i should get it tested for fuel cut then?

cheers