max boost?...33psi? - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 03-06-2012, 07:58 PM Thread Starter
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max boost?...33psi?

when i first bought my truck the egr valve was unplugged when i floored it i got 25psi boost not towing. the other day i took the egr valve out and cleaned it and plugged it back in it runs great but when i floored it i hit about 33psi boost and 1000 degree egts not towing.im pretty sure the truck is stock...maye their is some mods im not sure about the previous owner had added but i really dont think so. just wondering if thats right seems a little high to me??
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post #2 of 7 Old 03-06-2012, 08:05 PM
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post #3 of 7 Old 03-06-2012, 08:07 PM
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i think it a little high but i have hit about 32psi but my egt's were about 800

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post #4 of 7 Old 03-06-2012, 09:00 PM
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Max boost stock is 27psi I believe, Ive got a stud safe tune from Cale at bts, I floored mine in 5th ,best 1:1 with the zf6 ,and I barly broke 30psi on stock boost gauge, I didn't hold it long but gauge wasn't climbing fast so. I hit 40psi once with last 05 truck on the dyno with innovatives xrace.

If anything a clean valve might push open under boost releasing boost, shouldnt add any..

09 F450 CC LB lariat 6.4 black on black 23k miles, stock.. (For now)...


97 F250 SC LB 4x4 7.3 05 Superduty axels, 18" King Ranch Rims, "under the knife"

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post #5 of 7 Old 03-06-2012, 09:59 PM
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I hate to piggyback on a thread but I'm using the Torque app on my phone and the most boost i've seen out of my truck is 22-23 PSI.

Seems like I may have some cleaning to do on the turbo or is that ok for an 03 cause its a little larger turbo?

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post #6 of 7 Old 03-07-2012, 12:42 PM
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You will typically get a higher boost reading if you put it under a load (like 45 mph in OD) and roll into the throttle without flooring it. It needs a load to make max boost and most tunes back it off a bit under WOT for safety.
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post #7 of 7 Old 03-07-2012, 12:49 PM
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The Torque ap uses the OBD2 port which shows a slightly lower boost PSI then mech guages...

And 03 turbos are exactly the same size wise from all of the other 03-07 turbos...
They just have a different count of fins inside (less fins) which makes it louder.




I usually see 25-27 PSI when Im in high Rpms

and 30-35 PSI when I do what PGreenSVT is talking about (rolling into the throttle on the highway and not letting it downshift)

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