How Much Boost? - Ford Powerstroke Diesel Forum
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post #1 of 50 Old 04-23-2008, 07:10 PM Thread Starter
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How Much Boost?

How much boost does your OBS make. With the mods in my sig I hit 21 psi just punching it on the street from 40 to 60 mph. I expected around 15 max out of the OBS.

Nick, BPS Historian
1995 F-250 4x4 7.3 Powerstroke
Isspro Gauges, Tony Wildman Tunes, PSGH Stage 1 Injectors, Early 99 Intercooler, ATS Stage 6 E4OD, TCI Tranny Cooler, Snow Water/Meth, Traction Bars, EBPV Brake, TC Lockup Switch, Spray-on Liner, K&N Intake w/ NAPA 6637 Filter, 3" downpipe, 5" mitre stacks.
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post #2 of 50 Old 04-23-2008, 07:15 PM
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Before I opened my exhaust to a 4" strait pipe with a 3" DP, I could hit that with the chip on high.

Now, I only see 15 psi while towing.

When I get new injectors that will be a different story.

Jody in Mesa,Az
97' crew cab xlt, F350
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post #3 of 50 Old 04-24-2008, 02:40 AM Thread Starter
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So why am I hitting it with a wide open exhaust? 3'' dp, 4'' section(short), 5'' all the way from under cab to stacks.

Nick, BPS Historian
1995 F-250 4x4 7.3 Powerstroke
Isspro Gauges, Tony Wildman Tunes, PSGH Stage 1 Injectors, Early 99 Intercooler, ATS Stage 6 E4OD, TCI Tranny Cooler, Snow Water/Meth, Traction Bars, EBPV Brake, TC Lockup Switch, Spray-on Liner, K&N Intake w/ NAPA 6637 Filter, 3" downpipe, 5" mitre stacks.
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post #4 of 50 Old 04-24-2008, 08:33 AM
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I can hit 26 psi with my truck with all the mods listed in my sig

03 king ranch w/ a cummins
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post #5 of 50 Old 04-24-2008, 09:34 AM
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Quote:
Originally Posted by GM Duraturd View Post
How much boost does your OBS make. With the mods in my sig I hit 21 psi just punching it on the street from 40 to 60 mph. I expected around 15 max out of the OBS.
Pull the chip off and you will see those numbers.

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post #6 of 50 Old 04-24-2008, 11:43 AM
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JFines you should only get moreboost with your exhaust done, since it relieves backpressure letting the turbo spool quicker and higher.

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~ Custom 6" AEM Intake
~ Tymar 3-4" Ceramic DP
~ MBRP 4" Exhaust
~ BB Mod
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post #7 of 50 Old 04-24-2008, 05:36 PM
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Quote:
Originally Posted by GM Duraturd View Post
How much boost does your OBS make. With the mods in my sig I hit 21 psi just punching it on the street from 40 to 60 mph. I expected around 15 max out of the OBS.
Mine was making over 50....... then i took the chip and nitrous off and now it only makes half that
post #8 of 50 Old 04-24-2008, 09:10 PM
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Mine only makes 45 in the daily driver setting, what did you do to this chip Tony? lol I really need headstuds

1995 Reg Cab F350
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post #9 of 50 Old 04-25-2008, 11:00 AM
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Stroked what have you done to your truck??? What tunes do you have? You make a whole lotta boost there! I hope I can do the same.
Ever dyno your truck? or drag it?

1996 Powerstroke
133,000 and counting...

The Works:
~ Ported Turbo & 1.0 Hot Housing
~ Turbo blanket
~ Ceramic Manifolds
~ Wrapped Up-pipes
~ Banks Technicooler
~ 3" Superduty Plenums
~ Custom 6" AEM Intake
~ Tymar 3-4" Ceramic DP
~ MBRP 4" Exhaust
~ BB Mod
~ PHP Tunes
~ Transgo Shift Kit
~ DIY 140v IDM mod
~ Electric Fans
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post #10 of 50 Old 04-25-2008, 11:16 AM
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i have a stock 96er, 5psi @ 65mph. the best i have been able to do is 16psi.

if you see a light at the end of the tunnel, it's probably just a photon torpedo
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