Boost Relief Valve
Elder User
Joined: Sep 2004
Posts: 780
Likes: 1
From: Chicago suburbs
correction---Restictor should be on the turbo side of the BRV, High pressure side. Pop-off valve towards the map should be the low pressure side, so no restrictor. I remember that when I tried to connect the nipple from my brass T connector to the BRV, found that the hose connector had the restrictor in it (on the turbo side). Could not connect the two. Had to use a short piece of hose.
Postmaster
Joined: Jan 2004
Posts: 4,758
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From: colorado
just a note for you guys, the brv can stop an overboost SES light (that will defuel) but if you are running higher boost (over 25psi) the SES light can still blink on in responce to an "over pressure" reading by the EBPS (Exhaust Back Pressure Sensor), it will turn on the SES for a moment but will not defuel the engine
Lead Driver
Joined: Apr 2003
Posts: 9,965
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From: H-town, MN
Originally Posted by wlihntr
just a note for you guys, the brv can stop an overboost SES light (that will defuel) but if you are running higher boost (over 25psi) the SES light can still blink on in responce to an "over pressure" reading by the EBPS (Exhaust Back Pressure Sensor), it will turn on the SES for a moment but will not defuel the engine
Senior User
Joined: Jan 2004
Posts: 336
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From: 29 Palms, CA
Originally Posted by kawika
I had the same problem and I placed the boost gauge "T" between the BRV and the MAP sensor to test. Boost went to 22 Lbs MAX. And in this configuration I could not get my SES light to go on. So I placed my BRV as close to the turbo as I could and added another 12 inches of hose going to the MAP sensor, and since I did that, SES does not come on anymore (for over boost). Turbo -> Boost Gauge "T" -> BRV ----> MAP... Also was suggested that some WD40 be added to the valve just in case it was sticking. Now my boost goes to 30Lbs and no SES light
When you took apart the BRV, did you notice that one of the brass hose fittings has a restrictor installed? This restrictor should be on the MAP side of the BRV. So the higher pressure goes out the pop-off valve, lower pressure to the MAP sensor. If the restrictor is not installed (or on the wrong side of the BRV), MAP will see high pressure.
When you took apart the BRV, did you notice that one of the brass hose fittings has a restrictor installed? This restrictor should be on the MAP side of the BRV. So the higher pressure goes out the pop-off valve, lower pressure to the MAP sensor. If the restrictor is not installed (or on the wrong side of the BRV), MAP will see high pressure.
Elder User
Joined: Sep 2004
Posts: 780
Likes: 1
From: Chicago suburbs
What the Boost Relief Valve does, is to keep the MAP sensor form reading the boost pressure above the BRV setting (Which is about 22 Lbs on my BRV.) This keeps the engine from defueling whan at higher boost levels. You may be at 25+ Lbs. of boost, but the MAP sensor sees only about 22 Lbs (or what the BRV is set at.) When I added the extra hose, it seemed to not bring on the SES light (was at the 85 HP tune), but since have found at the 100 HP tune, I may or may not get the SES light (has come on three time the last few weeks). I do not pay any attention to the SES light unless it stays on for more than a couple of minutes. I have found no codes stored when it comes on.
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