I've never been able to monitor the boost on my 7.3 until today when i threw my SCT Xcal 3 on it and setup the datalogging to check all the temps and pressures. At running speeds like 60 mph the boost was reading 2.5-3 psi and at 70 it was reading 3.5-4 psi. I feel like this is either way to low and there is a leak somewhere or the sensor that reads boost psi is bad. Now when i flow it i see the boost climb up to 17-18 psi, which if i recall is max boost for a 7.3 (correct me if im wrong).

Any help is appreciated thanks

 

Your boost level when you go WOT is right about where it should be. It could be a tad more, depending on a few different factors.

Heading down the freeway, just cruising, you're right where you wanna be.

Based on the info given in your post, I don't see anything wrong with your numbers.

Stewart

 

yup, as Stewart said,them numbers is about rite.
with the mods i have, i can see upwards of 30 lbs boost at full kill, but cruising down the road sometimes you can not even see any boost showing on the gauge.

 

I have the same with my mods. @ 72 flat highway 3.5 -5 boost. @ 60 -65 I wont see any. Of course when I get on it I see 22-23 max. Ive heard of some when running 70 there at 10 lbs of boost but of course it all depends on what mods are installed.

 

You can make a boost tool and pressurize your system from 5 - 10 psi and see if you have any leaks somewhere.

 

yup x3
your numbers are good... better than good for a bone stock motor.
i see 12psi on mine max... but i know i have leaky up pipes...
at 70 i still see 2.5-3psi
check the connections where your up pipes meet up with the collector for soot when you do the leak test. if you see any... they need to be reworked... im swapping mine out for the bellowed internationals.

xtof

 

I agree, numbers are in line. Enjoy !!!!

 

Yep those numbers seems right on. When I'm on the freeway cruising at 70 I see about 5-6 psi, at WOT I've hit 80 psi.

 

Yup... good numbers.

*NOTE* I saw comments on numbers that can be a little confusing to those who have not had a boost gauge before. The slightest incline/decline in the road or head/tail wind will move your boost number by 3 or 4 PSI during cruise. I get about 3 - 4 PSI during cruise at 65 MPH on the flat with no wind and I just got 10 PSI at 65 (empty) up a mountain pass today.

 

your right about that.

 

Numbers look in line with mine. I would probably check for leaks anyway. Search the forums for the boost leak tool and build one. Cost me all of about $15 to build one and I checked my truck yesterday, I was surprised at all the places I was leaking boost.

 

thanks everyone for the input, im used to my 6.0 that makes 10-11 psi at 75.
Im gonna check for any leaks though just to be sure

 

I wonder what my truck has done to it I build 25-30 lbs doing polls empty

 

With a BD billet compressor wheel and waste gate actuator I can build 35psi. That's measured right at the compressor outlet and my boots are not in very good shape so I don't know how much of that is actually making it into the engine. I'll be replacing the boots (and up pipes) when I install the non EBPV turbo pedestal.