scoob_wrx1

hi all i have 2001 subaru impreza wrx bugeye,has a problem wen im flat out from 3rd gear up the bar boost keeps going from 1.5bar down to 1 bar then back to 1.5bar like the car is losing power but eventually does get there,the turbo is a vf34 roller bearing turbo.i thought it could be boost creep any information let me no
Help needed asap thanks

mark

scoob_wrx1

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Jolly Green Monster

iTrader: (4)

is it mapped for 1.5bar?

Simon

scoob_wrx1

hi mate its mapped to 1.25 bar,it could be boost creep i thought but it does it from 3rd gear up its recently had a new vf 34 roller bearing turbo,or could there be a vacum pipe of thanks mark

scoob_wrx1

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scoob_wrx1

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Jolly Green Monster

iTrader: (4)

has it been mapped on the new turbo?

boost creep is usually at higher rpm where the wastegate cannot flow enough exhaust gas away from the turbine and so the boost increases..

you are describing unstable boost.. which would point to the wastegate duty / boost needing setting up for turbo.. etc

Simon

scoob_wrx1

it has been mapped by powerstation about a6 months ago and since the cold wheather has come its been doing it mate,its very strange,wat else could u suggest,thanks mark

scoob_wrx1

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Butty

iTrader: (2)

I'll ask again - was the 1.25 bar map for a different turbo model?
Have you now fitted a VF34 without a new remap and are getting the boost spikes?

Nick

scoob_wrx1

no mate the turbo was the vf34 roller bearing.It was a brand new unit aswell,i have defi bf gauges that also read it a 1.25 bar thanks mark

scoob_wrx1

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Jolly Green Monster

iTrader: (4)

so either the colder weather means a tweak is needed to the boost duty or something on the car has altered.. pipe off for example..

Simon

scoob_wrx1

thanks for the advice mate um 1 more qestion i have a slight idle problem too,if i rev the car then let the foot of the revs drop below 500rpm like the car want to turn off and even sometimes it does turn off any ideas thanks mark

scoob_wrx1

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Jolly Green Monster

iTrader: (4)

sounds like possibly a vaccum pipe leak.. whcih might explain the boost problem too..

Simon

The rookie

iTrader: (1)

With the other Simon, the idle problem sounds like a pipe off cauing and air leak and lean at idel, the same airleak will/could cause rich running as well as the boost (lack of) control.

Simon