When I boost up underload , the turbo boost is uneven.

Any suggestions what it could be ?

Describe "uneven"

Is there a hesitation? Are you remapped?

Could be a leaking boost or vacuum hose or faulty N75 valve which controls the wastegate, or as Bertee said a fault with the engine map (if its been remapped).

If it "feels" like it's hesitating are you sure it is the boost or could it be the fueling / ignition? Are you watching a boost gauge to know that the boost is not going up smoothly?

Edited 19 May, 201016 yr by chicken_eyebrow

Describe "uneven"

Is there a hesitation? Are you remapped?

Hi i have had my octavia tdi remaped from 110 bhp to 130 , it has been done about one year, when the turbo spools up it surges to you get to about 2000 revs ,wondering weather it could be injectors

sticky turbo veins is your problem buddy do a search

Could be a leaking boost or vacuum hose or faulty N75 valve which controls the wastegate, or as Bertee said a fault with the engine map (if its been remapped).

If it "feels" like it's hesitating are you sure it is the boost or could it be the fueling / ignition? Are you watching a boost gauge to know that the boost is not going up smoothly?

Thanks i have put a n75 on.air mass meter,pluss boost switch thays on top of the intercooler ,i think i might try injectors

it will be 99% what i said buddy search sticky veins problem very common

Are the N75, MAF etc new or used ones?

Are the N75, MAF etc new or used ones?

All new products

sticky turbo veins is your problem buddy do a search

cheers m8 have not heard of that one . i will loo look in to that