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post #1 of 18 Old 01-31-2014, 04:07 AM Thread Starter
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Curious about stock boost ...

Hey Guys,

Well the first mod was to remove the AIH element, and plug it with a RiffRaff plug with 1/8 pipe port....So I would be ready for gauges later


I found this Old Autometer 'Blower' PSI guage from one of Father-n-Laws Mopar builds that was never used ....

Still in ratty box, labeled '89 !!

So I decided to run a line. (I ran it long, with excess tied away for a future use in pillars gauges) currently mounted under dash

I noticed this guage falls back (pegs) past the "0" mark, and as you slowly drive, is raises up to "0" then maxs at about 19.5/20 psi.

So considering how much the guage is past the "0", I'm assuming its not reading right ?

I'm not sure, this is why I ask ....


Stock truck with a downpipe is all.

Wondering if the guage is FuBaR ??

Or mabey i'ts because I'm used to all the gauges featured in the Fast n Furious movies that peg to max in the Civics ???

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John

2002 F-250, CCSB, 4" Exhaust, Stock otherwise

http://www.acchollister.com/
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post #2 of 18 Old 01-31-2014, 04:22 AM
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Is there not an adjustment screw to allow you to set "0" with the engine at idle?

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post #3 of 18 Old 01-31-2014, 05:46 AM Thread Starter
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Hmmm, I dont think so,

But ill check again.

John

2002 F-250, CCSB, 4" Exhaust, Stock otherwise

http://www.acchollister.com/
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post #4 of 18 Old 01-31-2014, 05:50 AM
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I think this is one of the biggest misconceptions about boost gauges. It is perfectly normal for it go below 0. Why you ask?? Well it has to do with altitude. Most good gauge maker SHOULD calibrate the gauge to 1 atm(sea level) just for consistencies sake but id guess most dont and are calibrated at whatever altitude their factory is at.

So if they set it at 0 psi at their altitude say 1000 ft above sea level and they ship it to you and you get it and open it at say 5000 ft above sea level your going to have less ambient air pressure at your altitude so the gauge reads slightly lower than 0 psi.

Some guys say its because a diesel creates a small vacuum at idle that is true for a N/A diesel, but thats incorrect for a turbo diesel. It doesnt create a vacuum it creates pressure because the turbo pushes the air into the intake but at idle its so little that it doesnt register on the needle until the boost starts to build.

So in short no the needle should read below the 0. Sorry for the long winded response but i see this misinfo every few months or so. As for an adjustment screw i doubt it ive never seen one on a gauge but ive never seen ever gauge out there.

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post #5 of 18 Old 01-31-2014, 06:21 AM Thread Starter
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Ok, thanks guys ....

But ....


Does anyone know what the stock psi is/should be ?

John

2002 F-250, CCSB, 4" Exhaust, Stock otherwise

http://www.acchollister.com/
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post #6 of 18 Old 01-31-2014, 06:29 AM
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Quote:
Originally Posted by ChiefRocka View Post
Ok, thanks guys ....

But ....


Does anyone know what the stock psi is/should be ?
Your right on it, 202 psi is about what you can push out of a stock truck

Local Jackass member Pat

Battle cry of every 6.0 owner out there
Quote:
Originally Posted by access_max View Post
With the issues fixed a 6.0 can run circles around a 7.3.
2000 F-350 7.3L ZF6
Standard 7.3 mods
SCT tuned
8" Fabtech lift 13" total
5:13 Gears
46" Goodyear MVTs Military takeoffs
Bushwacker Cut-Out Fender Flares
Ranch Hand front and rear bumper
On-board air W/Semi horns

1995 F-350 7.3L E4OD DRW
Standard 7.3 mods
PHP Hydra W/Tony Wildman tunes
160/0 Injectors
T-500 HPOP
E-fuel Conversion
West Coast mirrors
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post #7 of 18 Old 01-31-2014, 05:12 PM
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id say about 17 psi max stock tune with 4 inch exhaust and a better intake.

a truck with generic programmer 21-24 psi.

stock tune with riffraff billet, exhaust, intake, high flow exhaust outlet and red line unplugged i can get 26 psi

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post #8 of 18 Old 01-31-2014, 05:56 PM
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Quote:
Originally Posted by blue99stroker View Post
id say about 17 psi max stock tune with 4 inch exhaust and a better intake.

a truck with generic programmer 21-24 psi.

stock tune with riffraff billet, exhaust, intake, high flow exhaust outlet and red line unplugged i can get 26 psi
I have no problem reaching 20+ in my stock tune going up a moderate hill thats before i unplugged the red tube too

Local Jackass member Pat

Battle cry of every 6.0 owner out there
Quote:
Originally Posted by access_max View Post
With the issues fixed a 6.0 can run circles around a 7.3.
2000 F-350 7.3L ZF6
Standard 7.3 mods
SCT tuned
8" Fabtech lift 13" total
5:13 Gears
46" Goodyear MVTs Military takeoffs
Bushwacker Cut-Out Fender Flares
Ranch Hand front and rear bumper
On-board air W/Semi horns

1995 F-350 7.3L E4OD DRW
Standard 7.3 mods
PHP Hydra W/Tony Wildman tunes
160/0 Injectors
T-500 HPOP
E-fuel Conversion
West Coast mirrors
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post #9 of 18 Old 01-31-2014, 08:06 PM
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I can hit 20psi with the stock tune as well.

PIS 175/80's, Van Turbo with EBPV, BD Billet Wheel
Lots of money spent at RiffRaff
Holley fuel pump, in tank mods, crappy riding leveling kit, DP-F6, 5 Gauges+Edge CS in dash, CB radio in Dash, over 100 goofy little mods
Still pretty slow, just less slow now.
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I love finally having my truck back... that 7.3 dog that I was driving was just not cutting it.
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post #10 of 18 Old 02-02-2014, 11:33 AM
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Quote:
Originally Posted by Rammstein1224 View Post
I have no problem reaching 20+ in my stock tune going up a moderate hill thats before i unplugged the red tube too

What is this red tube and where is it? I can use all the boost i can get.

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