Boost Pressure
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Senior User
Joined: Sep 2006
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Boost Pressure
Im looking to get a boost gauge, but im not sure if I should go with 0-35 psi or 0-60 psi. Any suggestions? Also cant decide between the autometer cobalt or the cobalt 2. Which does everyone like? THanks
Playing in the Dirt
Joined: Oct 2005
Posts: 2,302
Likes: 1
From: Southwest Georgia
Your stock turbo will not take much boost over 30-35, on regular basis. I run the 35 gauge with two's and seldom run the boost much past 25. Also on a 35 gauge you more needle movement at the low end 2-10 (it's marked every 2) on the 65 gauges that I have seen it starts at 5. Just my .02
Hotshot
Joined: Jul 2003
Posts: 12,177
Likes: 40
From: Newport, WA
What's with the 18 PSI stock claims... is that stock intake and exhaust too? My truck is "stock" with a 6637 filter and 4" turbo back exhaust and I have no problem hitting 22 PSI empty when floored, I can get higher when on a grade or pulling a load.
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
stock intake and exhaust don't help but you must also remember you have larger injectors and turbo that is set up different than the OBS.
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Hotshot
Joined: Jul 2003
Posts: 12,177
Likes: 40
From: Newport, WA
I'm running an early bird, I think I have the same injectors as the OBS (AB code). I still see other SD guys claiming the same 18PSI max stock and could never understand why. Even with the conservative fueling of the original Cali emissions PCM I could get 22 psi when I mat the go pedal.
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Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
I'm running an early bird, I think I have the same injectors as the OBS (AB code). I still see other SD guys claiming the same 18PSI max stock and could never understand why. Even with the conservative fueling of the original Cali emissions PCM I could get 22 psi when I mat the go pedal.
Post Fiend
Joined: Apr 2004
Posts: 12,835
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From: Silver Lake Dunes, MI
yep OBS federal use 90cc injectors (AA's), OBS cali and early 99's use 120cc (AB's) and late 99 to 03 use 140cc (AD's)
Posting Guru
Joined: Dec 2005
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I am surprised to read this, I too am hitting 22+ boost on my 97 with stock squirters non-cali truck. All I got is straight through and down pipe with intake, 10k, shimmed fuel and a 120 IDM. I sit around 20psi empty, 22-24 GCWR 13,500lbs
Post Fiend
Joined: Mar 2007
Posts: 9,010
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From: Johnson City, TN.
That is exactly where mine was before I did my sticks. I could hit 25 every now and then.
Lead Driver
Joined: May 2007
Posts: 8,606
Likes: 13
From: Belair md
i am running the superchip, intake, exhaust, icp and eot mods, and i can barely touch 20 psi, and its only as i am within the last 1-200 rpm of the limiter, typicly i only see 16-17 psi as a max. i did lose about 2-3 psi with the 6.0 cooler so if you factor that my max is still only 23 psi.
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