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Old 03-03-2002, 01:35 PM   #1
YeeHa
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Member#: 8884
Join Date: Aug 2001
Location: Sin City Baby
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2002 WRX Sedan
Blue

Post Boost Gauge Reading Question Kinda Long

Hey guys I did a search, but couldn't find the info I wanted. Forgive me if this has been covered a million times. I have an Autometer boost gauge and I tapped in at the bov joint. I made a t fitting like I saw described in my searches. I also installed a turboxs boost controller. I want to make sure my readings are right since I have never used a boost gauge before. When the car is off it sits at o pressure. When you start it it goes into vaccum. I expected that since you aren't making boost. When I'm driving if I'm on the throttle it makes boost pressure and I have it tuned into 15 psi at wot. What I wasn't sure of is when cruising at any speed and any rpm it is always in vacum. An example cruising on the highway at 75 mph in 3rd gear with the cruise on equals vacum. Is that what it's supposed to do. Thanks for taking the time to help a newbie out.
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Old 03-03-2002, 01:41 PM   #2
PDG
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Somewhere around stage 4

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all normal. when cruising you'll likely be in vacuum, though not as much as if you were idling.

Go WOT while cruising and you'll see your boost (and your EGT) go through the roof.
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Old 03-03-2002, 01:47 PM   #3
selector37
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I have the autometer gauge tapped at the same place, and I'm using stock boost control. If you're worried about a slow leak somewhere, just let the car idle and watch your gauge. If you have a leak, no matter how you're driving, your gauge should always start to go back to zero. At idle, you'll be down around 20 mmHg vacuum, and it should stay they. If it moves down and back up, that's just the fan turning on and off.

I'm not sure what it should read if you're keeping a steady 75 mph in 3rd, because normally I'm in 5th once I cruise. It looks to me like the stock controller doesn't go over zero unless you are trying to accelerate. What are you getting WOT in 1st and 2nd?
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Old 03-03-2002, 02:59 PM   #4
YeeHa
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Thanks guys I figured it was right, but wanted to make sure. With my mbc I am getting 10-12.5 psi in first and 15-15.5 psi in second at wot. I turned it down a hair until I get my egt gauge in there. Car runs great though. Thanks again for the quick reply guys.


Also I don't normally drive 75 in third It is always in 5th while cruising. I was just checking to see if it would show boost or vacum while cruising with higher rpms.
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