I've just fitted a stage 1 hybrid turbo core and now getting ridiculous high boost problems. Before I changed the standard turbo I was getting no more than 1.2 bar of boost, it now goes off my gauge right round to the stop.
In fifth gear I can plant my foot and it'll boost to around the 1.8bar mark and bounce from 1.6-1.8bar.
In other gears it was boosting way way too much until about 15 minutes into driving when it seemed to calm down and settle at around 1.5 bar.
now my spec sheet ain't massive
stage 1 hybrid core
4 bar fuel pressure reg
standard intercooler (EVO 7 one is fitted but not plumbed in yet)
I set the actuator to half mm pre load but boost was worse so I set it to how it came off my turbo originally which was no pre load.
Does the ecu have to learn again as I have changed turbo cores for a uprated higher flowing one?
There are no split pipes anywhere and the ebc looks okay but can't confirm.
I do know that I should get it on the rollers and have it mapped but I ain't won the lottery just yet and funds are tight after Christmas.
Does anyone know how I can manually turn the boost down.
Oh just to add...... I would rather change a clutch and timing belt on a coupe than re fit the poxy under tray.