Boost gauge only putting out 3PSI? - Ford Powerstroke Diesel Forum
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post #1 of 21 Old 01-17-2012, 06:00 PM Thread Starter
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Boost gauge only putting out 3PSI?

So i was told when running stock i should be putting out maybe 18-20PSI under load.

Well i have been running my PHP chip on the truck and the 80HP daily driver tune when under load maybe gets to about 10-12PSI and the 120 Extreme tune maybe will get 15-17PSI.

Is this correct?



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post #2 of 21 Old 01-17-2012, 06:07 PM
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Your loosing boost somewhere. Stock I get 16-17 psi.
Check up pipes and boots.


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post #3 of 21 Old 01-17-2012, 06:33 PM
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boost leak somewhere, or your gauge line (if mechanical) might have a kink in it somewhere? I see around 10# just cruising with light throttle on my daily tune. hammered down sees 20-23'ish but I'm usually driving miss daisy with my truck

pop the hood and look for anything obvious and check the boost for rips or anything odd. check up pipes for black soot from a leak perhaps...


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post #4 of 21 Old 01-17-2012, 06:44 PM
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Yeah, I'd guess boost leak as well.

I can peg 26-27PSI pretty quick on 120 Race....(Turbo Master dumps boost above 27)

You should be in the mid-20's, anyway. What are you taking the reading with?
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post #5 of 21 Old 01-17-2012, 08:20 PM
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Make yourself up a 4" PVC test fitting with a tire valve stem in the end, and install it whets the PCV sleeve is before your turbo, and air it up to 20psi. Then go leak hunting.
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post #6 of 21 Old 01-18-2012, 05:56 AM Thread Starter
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Quote:
Originally Posted by ToMang07 View Post
Yeah, I'd guess boost leak as well.

I can peg 26-27PSI pretty quick on 120 Race....(Turbo Master dumps boost above 27)

You should be in the mid-20's, anyway. What are you taking the reading with?
Well on my gauges. I have pod gauges and just cruising at 65mph at just under 2000RPM i see maybe 2 psi.

I have the vacuum tube that has to be installed for the gauges. Ive checked the line and there aren't any kinks or cracks or anything that I'm aware of. I know the fitting is good and tight on it.

Even when i have my PHP chip set to 80HP daily driver, im still only getting about 14mpg in the city, and that's what i got before w/o the chip. Do you think that could have any affect?



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post #7 of 21 Old 01-18-2012, 06:53 AM
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You've got a gauge problem or you'd notice LOW power with only 12lbs boost. It wouldn't be a subtle thing You'd feel like you were driving a 4cly....

Boost is Load Dependent though, not just rpm. Going up a hill, pedal down, over 2,000rpm you should be close to 20 and if you're at 1/2 that, you're at 1/2 power. If you don't feel that way, you're gauge must be wrong.
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post #8 of 21 Old 01-18-2012, 07:06 AM
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Hell even on my stock truck I can hit 20-22psi just by stomping on her.
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post #9 of 21 Old 01-18-2012, 07:17 AM
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Here's what you do, in 2nd or 3rd gear, give her an WOT run, and see what PSI boost you get, and if it holds it. Report back with your numbers.
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post #10 of 21 Old 01-18-2012, 07:53 AM Thread Starter
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Quote:
Originally Posted by ToMang07 View Post
Here's what you do, in 2nd or 3rd gear, give her an WOT run, and see what PSI boost you get, and if it holds it. Report back with your numbers.
Ill give that a go here at lunch time alright? and ill let you know what im getting for PSI



4" Diamond Eye Turbo Back, MBRP 4" Delete Pipe, 5% Tint
DIY Tymar Intake, Stancor MOD, GlowShift Pod Gauges
PHP Phoenix Performance Chip, 2" Leveling kit, BDS Shocks


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