max boost?...33psi? - Ford Powerstroke Diesel Forum
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Old 03-06-2012, 06:58 PM
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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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Old 03-06-2012, 07:05 PM
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Old 03-06-2012, 07:07 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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Old 03-06-2012, 08:00 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..
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Old 03-06-2012, 08:59 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?

Thanks,
Nick
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Old 03-07-2012, 11:42 AM
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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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Old 03-07-2012, 11:49 AM
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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)

Extreme street and SRL
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