SRL+ Question
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Elder User
Joined: Nov 2010
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SRL+ Question
With this tune, I'm only hitting about 20 PSI at WOT. If I'm already rolling in a higher gear and ease into it, it will build into the high 20s or so for a bit, but will be back to about 20 before long. Is this normal behavior for this tune? It still has a ton of power and seems to run great, but seems a bit odd that the boost is so much lower than before.
MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,594
Likes: 144
From: SE Georgia
is that pressure read off the instrument cluster gauge?
or
an aftermarket gauge?
you should be easily hitting 30 psi...some guys I've talked to see 40+ psi if they stay into it very long. Remember that the inst. cluster gauge isn't correct when tuned
or
an aftermarket gauge?
you should be easily hitting 30 psi...some guys I've talked to see 40+ psi if they stay into it very long. Remember that the inst. cluster gauge isn't correct when tuned
MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,594
Likes: 144
From: SE Georgia
stock tuning and that gauge is accurate to within 5 psi
you really need an aftermarket gauge. I wouldn't be surprised if you are seeing 35 psi most times.
My truck before tuning was hitting 25-27 psi at WOT before dropping down to 20-24 psi. Now, I haven't seen it break 20 psi myself. I've got my gauges sitting in the garage for when I've time to install
you really need an aftermarket gauge. I wouldn't be surprised if you are seeing 35 psi most times.
My truck before tuning was hitting 25-27 psi at WOT before dropping down to 20-24 psi. Now, I haven't seen it break 20 psi myself. I've got my gauges sitting in the garage for when I've time to install
Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
If you have your EGR deleted or the valve unplugged then depending on your flash strategy you could be limited to about 20 psi and FWIW--anything over about 28 or 30 and the stock turbo starts to "choke".
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Elder User
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I would hit 28 or so all day long before tuning. I had the studs done and a bulletproof EGR cooler put it, so the EGR valve is in place and plugged in, although turned off in the tuning. I guess I'll do some experimenting this weekend with the other tunes including stock and see what happens.
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MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,594
Likes: 144
From: SE Georgia
Talk to Matt. I'm surprised he didn't tell you. He made sure I knew that the inst cluster gauge wouldn't work properly with his SRL. I've read the same over on PSN several times by other people as well
It may just be an aspect of the Gearhead tune that other tuners don't have????
It may just be an aspect of the Gearhead tune that other tuners don't have????
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Thread Starter
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Elder User
Joined: Nov 2010
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Talk to Matt. I'm surprised he didn't tell you. He made sure I knew that the inst cluster gauge wouldn't work properly with his SRL. I've read the same over on PSN several times by other people as well
It may just be an aspect of the Gearhead tune that other tuners don't have????
It may just be an aspect of the Gearhead tune that other tuners don't have????
Posting Guru
Joined: Oct 2010
Posts: 1,192
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From: Kerrville, Tx
yea he told me all i would see on my gauge was about 20 or so but as long as i dont hear a boom! im happy with it since it has tons of power. more boost out of a tune doesnt always mean power. i ran a tune once on my dually and on an accurate gauge i would only hit 23 psi and it still ran dang good!!! to me if i run over 30 psi it scares me to no end! unless you hear or see an exhaust leak i would say leave it alone
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Elder User
Joined: Nov 2010
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yea he told me all i would see on my gauge was about 20 or so but as long as i dont hear a boom! im happy with it since it has tons of power. more boost out of a tune doesnt always mean power. i ran a tune once on my dually and on an accurate gauge i would only hit 23 psi and it still ran dang good!!! to me if i run over 30 psi it scares me to no end! unless you hear or see an exhaust leak i would say leave it alone
I've got a bit of experience with forced induction in other vehicles, so I know that power is related more to the volume of air going in than the PSI. However, since no physical changes were made to allow the flow of more volume, I knew that I would not be making so much more power while having significantly less boost, thus the confusion. Good to know it's just an issue with the gauge reading. I like to make sure the potential problems are addressed before they turn into real problems. Thanks, guys.
Lead Driver
Joined: Nov 2007
Posts: 5,139
Likes: 209
Talk to Matt. I'm surprised he didn't tell you. He made sure I knew that the inst cluster gauge wouldn't work properly with his SRL. I've read the same over on PSN several times by other people as well
It may just be an aspect of the Gearhead tune that other tuners don't have????
It may just be an aspect of the Gearhead tune that other tuners don't have????
Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
A tune will change a lot of what the PCM thinks it see's with the manipulation of how sensor data is interpreted/reported to it. I didn't know the factory boost gauge was affected, but it doesn't surprise me either. I'd love too hear what you guys see with a mechanical gauge tapped to the intake elbow.
Lead Driver
Joined: Nov 2007
Posts: 5,139
Likes: 209
First I saw something like this was when the ICP Xgauge first got released. When I was tuned the numbers seemed too low. I verified this after my buddy hooked up an analog HPOP gauge and I plugged my SGII in while we made some passes. Hard passes with aggressive tunes pegged the analog(4000psi), and the SGII would report much lower ICP numbers(around 2800 IIRC) at the same moment.
Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
First I saw something like this was when the ICP Xgauge first got released. When I was tuned the numbers seemed too low. I verified this after my buddy hooked up an analog HPOP gauge and I plugged my SGII in while we made some passes. Hard passes with aggressive tunes pegged the analog(4000psi), and the SGII would report much lower ICP numbers(around 2800 IIRC) at the same moment.