SRL+ Question
Posting Guru
Joined: May 2003
Posts: 1,990
Likes: 1
From: Middleburg, FL
Keep in mind that with EGR turned off, you have less intake back pressure caused by intake turbulence from reingestion of the exhaust. Additionally, your intake charge will be cooler due to lack of ingestion of the higher temp exhaust gases. With no other changes (i.e., larger turbo), lower back pressure equates to more efficient air flow in the intake but also equates to lower boost since boost is a measure of back pressure. That's my take.
I've been thinking about installing a direct reading analog boost gauge to check this out. My intake elbow is already tapped for a probe but I just haven't been motivated to invest the time or funds to install one. And, I've been perfectly happy with the performance of my truck with Matt's SRL tune. I have noticed a 3-4 psi difference between the dash boost gauge and boost numbers on my insight gauge with the tune. The max boost I've seen on the insight with the tune is 24 psi while untuned it will hit 28 psi. I've always attributed the drop to the EGR being turned off with the tune. (I still have a functional EGR system.)
I've been thinking about installing a direct reading analog boost gauge to check this out. My intake elbow is already tapped for a probe but I just haven't been motivated to invest the time or funds to install one. And, I've been perfectly happy with the performance of my truck with Matt's SRL tune. I have noticed a 3-4 psi difference between the dash boost gauge and boost numbers on my insight gauge with the tune. The max boost I've seen on the insight with the tune is 24 psi while untuned it will hit 28 psi. I've always attributed the drop to the EGR being turned off with the tune. (I still have a functional EGR system.)
Senior User
Joined: Oct 2009
Posts: 374
Likes: 0
From: Ontario
well i actually never knew this so i paid attention today and you're right,,doesn't show proper boost at WOT! 3/4 throttle and both the factory boost gauge and my SCT TSX boost show anywhere up to 25psi, however WOT and both gauges read no more than 22psi...
not too happy bout that for i would like to know how much boost im pushing when WOT!!
not too happy bout that for i would like to know how much boost im pushing when WOT!!
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Elder User
Joined: Nov 2010
Posts: 514
Likes: 1
Then your options are to get a boost gauge that doesn't read off of the OBDII port or flash back to stock. They apparently have to trick the computer into seeing less boost in order to make that power that we all like so much .
MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,606
Likes: 151
From: SE Georgia
I'm going to buy some hard gauge line and replace my plastic tubing the gauge currently uses. Suspect the tubing is expanding under full boost and the gauge isn't reflecting true PSI
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