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Old 05-29-2002, 06:28 PM   #1
Scooby Newbie
Member#: 11821
Join Date: Oct 2001
Question question on stock WRX turbo guage

Can someone give me an explanation ...

I have the optional turbo guage installed by the dealer and I am not sure how to read it. Often I have seen posts describing the boost level in number between 12 to 16 or more (I am assuming this is PSI). The guage I have ranges from -.1 to .15. The highest I have seen it is about .9. Everything else is stock on my WRX. Can someone tell me how to convert this? And why is it negative at times?

Another question I have. I am not sure why the turbo only spools up for a second when the throttle is pressed and the transmission is not engaged. Does this mean that the turbo fan only spins if the car is in gear. What exactly is being messured by the guage? Is it the pressue inside the cylinder?

If you know of a good place me to learn about all this I would greatly appreciate it. Thanks.

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Old 05-29-2002, 06:52 PM   #2
Scooby Specialist
Member#: 18163
Join Date: Apr 2002
Location: Denver
2002 2.5 WRX


Do a search before you post

MPa Bar psi
0.01 0.1 1.45
0.02 0.2 2.9
0.03 0.3 4.35
0.04 0.4 5.8
0.05 0.5 7.25
0.06 0.6 8.7
0.07 0.7 10.15
0.08 0.8 11.6
0.09 0.9 13.05
0.10 1.0 14.5
0.11 1.1 15.95
0.12 1.2 17.4
0.13 1.3 18.85
0.14 1.4 20.3
0.15 1.5 21.75
MAD REX is offline   Reply With Quote
Old 05-29-2002, 07:13 PM   #3
Scooby Newbie
Member#: 11821
Join Date: Oct 2001
Default thanks

Thanks for the numbers MAD REX. I did search several times but came up empty.

Anybody able to explain the spool up blip when out of gear or the negative numbers on the guage.


pehavens is offline   Reply With Quote
Old 05-29-2002, 10:01 PM   #4
Scooby Newbie
Member#: 16791
Join Date: Mar 2002
Location: Pennsylvania
2004 WRX STi


A boost gauge is actually a dual gauge.
The negative numbers are vacuum (suction) and the positive numbers are turbo boost (pressure).
A vacuum condition is caused by the throttle only being partially open, making the engine “suck” for air.
A normally aspirated engine (no turbo) will go from negative to zero vacuum at wide open throttle.
A turbo actually pressurizes the incoming air creating boost.
Most cars use the vacuum provided from the engine to provide power to accessories such as power brakes.

.080=11.6 PSI
peczenij is offline   Reply With Quote

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