lagging on full throttle

[wagonman]

Hi im having some problems with my 2000 subaru wagon turbo.

 

running td05 turbo

ej20 block

yellow injectors

decat

fuel presure reg adj.

dump valve

and remapped

 

the car revs cleanly when sat still

it also drives smoothly until you stamp on the loud pedal and at around 4/5000rpm the car hesitates violently but feels as though it would push through , but obvs dont fancy blowing up the engine. 

 

anyone seen these symptoms before or have an idea what it may be?

 

 

 

[Pommy]

I had similar issues which ended up being a spark plug, would rev perfectly without any load but then when accelerating hard it would hesitate and judder.

[Gambit]

I would say the same as pommy or a failing coil pack if you check your codes you might find it's got a misfire code. I'f also check for any split or damaged pipes on the intake.