How much boost does a 7.3 make?
Thread Starter
|
Posting Guru
Joined: Oct 2009
Posts: 1,340
Likes: 4
From: Bradenton, FL
How much boost does a 7.3 make?
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
Any help is appreciated thanks
Super Moderator
Joined: May 2004
Posts: 29,380
Likes: 118
From: Central Coast of CA
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
Any help is appreciated thanks
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
i ain't rite
Joined: Mar 2005
Posts: 65,481
Likes: 5,542
From: Marlboro Mental Hospital.
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.
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.
Logistics Pro
Joined: Apr 2010
Posts: 4,446
Likes: 25
From: Panama City, FL
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.
Postmaster
Joined: Apr 2012
Posts: 2,613
Likes: 8
From: North Georgia
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
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
Elder User
Joined: Feb 2005
Posts: 896
Likes: 1
From: Chattahoochee Hills, Ga.
Trending Topics
Elder User
Joined: May 2008
Posts: 860
Likes: 2
From: Liberty Lake, WA
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.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
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.
*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.
Logistics Pro
Joined: Apr 2010
Posts: 4,446
Likes: 25
From: Panama City, FL
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.
*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.
Senior User
Joined: Jul 2006
Posts: 395
Likes: 0
From: New Hampton, IA
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.
Mountain Pass
Joined: Jul 2019
Posts: 199
Likes: 33
From: Northern California
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.
Thread
Thread Starter
Forum
Replies
Last Post
