2.5STI

Only just recently in the cold my car has been juddering in 5th gear and sometimes 4th....i have been reading posts and i think its overboosting in the cold...

It is a 2.5 conversion and i think it was set to 1.2 bar boost...it has a manual
boost controller under the bonnet...i dnt know if the best thing to do is turn
it down a little could if it mess it up because it was mapped to that boost .

plus i have no clue whitch way to turn it or how much? and dont wana boost it up and cause damage??

help

thanks

911

If you are not sure then go to a specialist.
You have invested a lot in that engine, why haven't you fitted a custom ecu?

Sounds like you have a brass Boost Controller valve instead?

Graham