Illest

im running -0.25 bar boost on idle
changed the idle valve but still problem
car is 2002 WRX

Steve's Sti

iTrader: (2)

what do you think its supposed to be on idle? its vaccume so that is fine

rob84

iTrader: (5)

as above its supposed to be negative as the car is pulling a vacuum

Illest

it was -0.5 to -0.6 on idle normally.
anybody with a boost gauge should know it doesnt idle that high up

JohnD

iTrader: (5)

Yes, it should be around -9psi (-0.6bar)
If the engine is idling ok it could be a problem with the gauge. Does it reach normal boost? Is the gauge direct reading or electric? (don't tell me it's Prosport)

JohnD

MartynJ

Check for a split in the vacuum line to the gauge initially.

rob84

iTrader: (5)

I'll second that with the prosport they are sh!te. My boost sensor has failed 3 times in 5 years and the oil pressure sensor is on its way out, confirmed results with a mechanical gauge and its reading 16psi lower than actual.

PADDYHOEY

iTrader: (24)

Air leak

Illest

i use defi gauges and also have an apexi avc-r
both of them reads -0.25 bar

Illest

want to sort it out myself before i have to take it to a garage

thanks

JohnD

iTrader: (5)

If the AVC-R is confirming it, it won't be a problem with the gauge so there has to be a problem to cause the engine to produce a low vac figure at idle. How is the car running?

JohnD

Illest

thanks guys, found split boost pipe. really couldnt notice it as was right next to header tank. now idling at normal -0.6 bar